Table of Content

12 October 2025, Volume 56 Issue 10

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RESEARCH ON ROCKET KEROSENE PRODUCTION TECHNOLOGY BY HYDROGENATION OF CATALYTIC CRACKING DIESEL

2025, 56(10):  1-6. 

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To utilize the high aromatic in catalytic cracking diesel,technology for producing rocket kerosene from catalytic cracking diesel through feedstock and product distillation optimization and deep hydroprocessing has been developed. The results of the pilot-scale tests showed that typical catalytic cracking diesel feedstock was fractionated to obtain the light fraction with suitable distillation range. With high-activity hydroprocessing catalysts and reasonably fractionating the hydrogenation product, rocket kerosene that meets the national rocket jet fuel standard was obtained. The technology has been commercially applied in SINOPEC Jingmen Company and can produce qualified ton-level rocket kerosene products, which have qualified heat transfer and coking performance. The technology has a good application prospect.

STUDY ON DEEP DENITRIFICATION OF WASTE COOKING OIL

2025, 56(10):  7-14. 

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Jet Fuel is prepared from waste cooking oil, which mainly includes two units : hydrogenation treatment and hydrogenation conversion. In order to avoid the poisoning and deactivation of the catalyst in the hydrogenation conversion unit, it is necessary to deeply remove the nitrides in the feedstock to less than 2 μg/g in the hydrogenation treatment unit. In this paper, the effects of different types of hydrogenation catalysts, catalyst grading methods and physical adsorption methods on the removal of nitrogen compounds from waste cooking oil were investigated. The experimental results show that NiMo catalyst has the best effect on the removal of oxygen, sulfur and nitrogen heteroatoms in waste cooking oil. The catalyst grading method can improve the hydrodenitrogenation effect ; the silica gel has a good adsorption effect on impurities in both raw materials and products, which can significantly reduce the nitrogen content.

COMMERCIAL APPLICATION OF EFFICIENT CATALYTIC CRACKING TECHNOLOGY FOR RESID TO CHEMCALS (RTC)

2025, 56(10):  15-20. 

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To promote the transition of traditional fuel-based refineries to chemical refineries, SINOPEC Anqing Petrochemical Company has implemented the resid to chemicals (RTC) technology in its 3.0 Mt/a heavy oil catalytic cracking unit. Commercial application results demonstrate that the RTC technology exhibits excellent heavy oil processing capabilities, enabling the blending ratio of hydrogenated heavy oil from the residue hydrodesulfurization unit to reach over 50%. The heavy oil catalytic cracking reaction exhibits high selectivity, with a total yield and total selectivity for light olefins and light aromatics of 40.71% and 49.67%, respectively. Specifically, the yield of ethylene and propylene is 4.34% and 19.14%, respectively. The hydrocarbon component distribution and output in the catalytic cracking gasoline can be flexibly adjusted according to market demands. The RTC reaction process achieves optimized distribution and efficient utilization of hydrogen elements in the feedstock. The RTC technology has pioneered a new path for low-cost "oil-to-chemicals" conversion, contributing to the realization of high-value utilization of resources.

STUDY ON INDUSTRIAL REVAMP OF MEDIUM-TEMPERATURE ZEOLITE C₅/C₆ ISOMERIZATION UNIT BY SOLID SUPERACID

2025, 56(10):  21-27. 

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In order to increase the production of high octane C₅/C₆ isomerization oil and meet the needs of gasoline quality upgrading, a certain refinery adopts the solid superacid C₅/C₆ isomerization technology developed by SINOPEC Research Institute of Petroleum Processing Co., Ltd. to carry out technical transformation of the existing medium temperature molecular sieve C₅/C₆ isomerization unit. Compared with the medium temperature molecular sieve C₅/C₆ isomerization technology, the reaction temperature of solid superacid C₅/C₆ isomerization is lower, the feed air velocity is higher, the catalyst density is higher, and the requirements for water content in the raw materials are more stringent. Therefore, a renovation plan was designed to stop using one original reactor, add a drying unit for raw oil and hydrogen, and add an online water content analysis unit. This technology renovation plan has lower investment costs, lower renovation difficulties, and a high equipment utilization rate (up to 81.5%); After the technological transformation of the device, the isomerization reaction temperature was reduced by 70 ℃, the research octane number of isomerized oil increased by 6.8, reaching 85, and the comprehensive energy consumption of the device decreased by 6.09%, achieving the technical transformation effect of exchanging small investment for large returns.

ANALYSIS AND COUNTERMEASURES FOR DIPLEG COKING IN CYCLONE SEPARATORS OF DEEP CATALYTIC CRACKING UNITS

2025, 56(10):  28-34. 

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Coking in the cyclone separator dipleg is one of the key challenges restricting the long-term stable operation of deep catalytic cracking units. An in-depth analysis of the persistent coking issue in the diplegs of cyclone separators within the disengager of a 2.2 Mt/a catalytic cracking unit indicated that the primary cause was the insufficient catalyst mass flow rate in the secondary cyclone separator diplegs. This inadequacy hindered the downward-flowing particles from effectively scouring the coke deposits on the inner walls.Additionally, the trickle valves of the secondary cyclone separator diplegs were submerged within the dense fluidized bed in the disengager, leading to a significant negative pressure differential and challenges in catalyst discharge.The prolonged residence time of oil vapor in the diplegs resulted in condensation and coking. To address the challenges associated with high negative pressure differentials, low catalyst column heights, and gas channeling in the secondary cyclone separator diplegs, which contributed to valve plate wear, a series of targeted solutions were developed.First, the installation elevation of the secondary cyclone separator trickle valves was raised by 3.6 m to reduce the negative pressure differential. Second, the inlet area of each primary cyclone separator was reduced from 0.3444 m² to 0.3357 m², and the inner diameter of the secondary cyclone separator diplegs was reduced from 273 mm to 219 mm. This increased the catalyst mass flow rate in the secondary cyclone separator diplegs, enhancing the scouring effect of the catalyst on the inner walls to remove coke deposits. After two rounds of maintenance and modifications, the number of coked and clogged cyclone separator diplegs significantly decreased. The solid content in the slurry oil and the particle concentration in the flue gas remained stable, indicating that the coking issue in the cyclone separator diplegs had been effectively mitigated. This approach can provide a valuable reference for addressing similar coking problems in cyclone separators of comparable units.

PROCESSING METHOD AND EFFECT ANALYSIS OF HYDROGENATED C₉ AS A TERMINATING AGENT IN GAS OIL CATALYTIC CRACKING UNIT

2025, 56(10):  35-38. 

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A new processing method for gas oil catalytic cracking unit is proposed. By introducing hydrogenated C₉ as a terminating agent into the riser reactor for recycling, the problem of the utilizing path of hydrogenated C₉ is solved, and the product distribution of the catalytic cracking unit is optimized. The experimental results show that this method significantly increase the yield of light oil by 1.58 percentage points, while ensuring stable operation of the unit, with a 1.38 percentage points increase in stable gasoline yield and a 0.20 percentage point increase in diesel yield. At the same time, it reduces dry gas yield by 0.13 percentage point and coke production by 0.20 percentage point. In addition, this method effectively controls the density and dry point of stable gasoline by adjusting process parameters such as reaction pressure and distillation tower top temperature, providing a new technological solution for integrated refining and chemical enterprises.

INDUSTRIAL PRACTICE OF PRODUCING No. 3 JET FUEL USING HYDRODEACIDIFICATION UNIT

2025, 56(10):  39-44. 

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In response to the demand for adjusting product structure by increasing jet fuel production and reducing diesel output, PetroChina Karamay Petrochemical Co., Ltd. conducted feasibility studies and adaptive modifications on an idle 0.3 Mt/a lubricant base oil hydrodeacidification unit for jet fuel production. Industrial calibration and long-term operational evaluations were subsequently implemented. The calibration results demonstrated that after processing the first side-cut oil from atmospheric-vacuum distillation unit, the refined oil exhibited excellent properties:Saybolt color of +30, total acid number of 0.005 mgKOH/g, thermal oxidation stability breakdown temperature exceeding 340 ℃, and silver strip corrosion rating of 1. All parameters could meet the specifications of National Standard GB 6537—2018 "No. 3 Jet Fuel".The operation results showed stable jet fuel quality and smooth unit performance, offering valuable insights for the revamping and quality-efficiency enhancement of similar facilities.

ANALYSIS OF OPERATION STATUS AND COUNTERMEASURES FOR SLURRY BED RESIDUE HYDROTREATING UNITS

2025, 56(10):  45-49. 

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After the commissioning of two newly constructed slurry bed residue hydrotreating units in an integrated refining and chemical project, the vacuum residue from two atmospheric and vacuum distillation units was entirely processed in the slurry bed units. By comparing key performance indicators such as feedstock properties, product yield, catalyst consumption, and hydrogen consumption of the two slurry bed units throughout 2022, it was concluded that there were certain deviations between the actual operation and the design values. Additionally, under high-load operating conditions, issues such as fluctuations in gas oil product quality, excessive load on slurry fractionation, high pressure drop in the vacuum column, and pipeline coking and clogging were observed.These problems were analyzed and the recommendations and strategies were proposed to address the practical operational challenges of slurry bed residue hydrotreating units.

FEASIBILITY STUDY ON HYDROGEN PRODUCTION BY ELECTROLYZING OILFIELD PRODUCED WATER WITH RENEWABLE ENERGY POWER

2025, 56(10):  50-55. 

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At present, the common pure water electrolysis technologies all rely on the acquisition of ultra-pure fresh water. Water is the most critical raw material for electrolyzing water, and wastewater resources can also serve as an important source of energy production. The total amount of produced water treated daily in oil fields is large and the cost is relatively high. If it is not utilized, it will cause a waste of resources.The electrolysis treatment and co-production of hydrogen technology can be introduced to improve the current situation..By comparing the advantages and disadvantages of various hydrogen production technologies, the feasibility of using renewable energy electricity to electrolyze produced water in oil fields for co-production of hydrogen and degradation technology is explored through on-site experiments.

EFFECT OF CARRIER MORPHOLOGY ON BED VOIDAGE AND OPTIMIZATION STRATEGIES

2025, 56(10):  56-62. 

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This study investigates the effects of the strip diameter, strip length distribution, and morphology of carriers on the void fraction. The results demonstrate that under laboratory measurement conditions, the larger the strip diameter and the longer the average strip length, the higher the void fraction of the carrier. Carriers with different morphologies exhibit varying proportions of the real part, and there is an inverse relationship between the proportion of the real part and the void fraction. The carrier pile ratio is related to both the proportion of the real part and the void fraction. By examining the relationships between morphology and efficiency factors, strength, and void fraction, a conceptual approach for simulating and optimizing carrier morphology has been proposed to achieve the optimal catalyst morphology under specified conditions.

PREPARATIONOF HIGH-ENERGY CRYSTAL FACET γ-Al₂O₃ SUPPORT AND ITS PERFORMANCE FOR HYDRODESULFURIZATION OF DIESEL

2025, 56(10):  63-77. 

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The strategy of preparing γ-Al₂O₃-CT with rod-like morphology and preferential exposure of high-energy (111) crystal facets by using cetyltrimethylammonium bromide (CTAB) assisted alcohol aluminum hydrolysis was successfully developed. This support exhibits abundant B acid sites and a high —OH density. During the hydrolysis process of alcohol aluminum, CTAB can prevent large agglomerations of boehmite particles; during the hydrothermal process, the surfactant acts as a structure-directing agent to regulate the formation of rod-like alumina in a directional manner. Research shows that the γ-Al₂O₃-CT rod-like carrier with a high exposure rate of high-energy (111) crystal facets prepared by the above strategy has a strong metal-support interaction (MSI) on its surface, which can induce the highly dispersed active phase. The abundant acidic sites are conducive to promoting the hydrodesulfurization (HDS) reaction activity of the active phase. The physicochemical properties of the catalysts were analyzed using various characterization techniques, including XRD, XPS, FT-IR, Py-IRand et al, and the catalytic performances werealso evaluated. The results indicate that the CTAB-assisted cat-CT catalyst outperforms other catalysts in the series in terms of catalyst morphology, exposure rate of high-energy (111) facets, hydroxyl group intensity and sulfidation depth.The cat-CT catalyst prepared by this method shows excellent reaction activity and selectivityin the HDS reaction of dibenzothiophene, which is significantly better than other catalysts in the same series.

PREPARATION AND PERFORMANCE EVALUATION OF BIO-BASED GREASE DERIVED FROM CASTOR OIL AND CHITIN

2025, 56(10):  78-86. 

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In this study, castor oil and mineral oil were employed as base oils, while chitin, calcium stearate, and lithium stearate served as thickeners, respectively. The optimal grease formation conditions were determined through orthogonal experimental design to prepare base greases. The physicochemical properties of the castor oil-chitin system were systematically compared with those of metal soap-based (calcium/lithium stearate) greases. Microstructural characteristics, thermal stability, rheological properties, and tribological behavior were analyzed using scanning electron microscopy (SEM), thermogravimetric-differential scanning calorimetry (TGA-DSC), rheometer, and a four-ball tribometer. Results demonstrated that the castor oil-chitin grease exhibited superior performance: a dropping point exceeding 330 ℃, steel mesh oil separation rate of 3.71%, and enhanced mechanical stability, colloidal stability, and high-temperature stability compared to metal soap-based greases. TGA revealed higher initial decomposition temperatures, indicating superior thermal stability. Rheological analysis highlighted exceptional viscosity retention and shear recovery capabilities at elevated temperatures. The four-ball test showed a weld load of 2452 N (exceeding metal soap-based greases) and comparable friction coefficient (0.0765). The castor oil-chitin grease exhibits excellent overall performance and environmental friendliness, offering a novel approach for the development of bio-based lubricants and contributing to low-carbon and sustainable development strategies.

EFFECT OF GLYCEROL MONOISOSTEARATE AND PHOSPHOROTHIOATE COMPOUND ON FRICTION PROPERTIES OF VEHICLE GEAR OIL

2025, 56(10):  87-93. 

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The aim of this study was to investigate the effects of competitive adsorption of mono-isostearate (FM-1), butyltriphenyl thiophosphate (AW-1) and acid thiophosphate (AW-2) on the friction properties of vehicle gear oil. The friction properties of AW-1, AW-2, FM-1, and their composite systems were evaluated using SRV tester and surface analysis was conducted using S neox three-dimensional confocal white light interferometer, while the adsorption behavior of antiwear and friction modifier on steel surfaces was examined quartz crystal microbalance with dissipation (QCM-D). The results revealed that both AW-1 and AW-2 had stable wear resistance, while FM-1 had no wear resistance. In the combination of AW-1 and FM-1, the competition of adsorption sites leads to antagonistic effect, and the wear resistance of AW-1 deteriorated significantly. When AW-2 was mixed with FM-1, FM-1 regulated the adsorption configuration through steric hindrance effect, which inhibited the possibility of forming brittle FeS film between sulfur element in AW-2 molecule and metal surface, while retaining the anti-wear properties of P element in AW-2.

APPLICATION RESEARCH ON DYNAMIC REAL-TIME OPTIMIZATION BASED ON REINFORCEMENT LEARNING TECHNOLOGY

2025, 56(10):  94-100. 

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Focusing on the application of deep reinforcement learning algorithms in chemical industrial processes, the deep Q-network (DQN) algorithm was used to simulate and optimize the operating temperature of the Williams Otto reaction, achieving adaptive adjustment of the reaction temperature and significantly increasing the yield of high-value products and economic benefits. The proximal policy optimization (PPO) algorithm was applied to the optimization of operating parameters in the steam cracking process for ethylene production. Based on the convolutional neural network architecture (D-VGG), a model of the ethylene cracking process was established. The reinforcement learning agent interacted with the ethylene cracking model environment for learning and optimized the operating parameters of the cracking unit, significantly enhancing the yield of ethylene and propylene. The research results not only verified the effectiveness and practicality of deep reinforcement learning algorithms in chemical industrial processes but also provided new ideas and methods for the real-time optimization control of other complex industrial systems.

DOWNSTREAM CRUDE OIL SCHEDULING IN REFINERIES CONSIDERING UPSTREAM RESOURCE CONSTRAINTS

2025, 56(10):  101-109. 

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Starting from the downstream of the oil refining enterprises, the problem of crude oil storage and transportation scheduling was studied, and a downstream constraint planning model of the oil refinery was innovatively constructed. On the basis of the traditional crude oil scheduling constraints, the logical constraints of upstream resource quantities including the unloading resources of oil tankers were added. Combined with the operational characteristics of delayed transportation in long-distance pipelines, a downstream crude oil scheduling scheme considering upstream resource constraints for the oil refinery was formed. The established model was solved through a case study. The results show that the model has a significant advantage in solving efficiency. Feasible scheduling schemes were obtained within 0.6 to 1.7 seconds under different time period divisions. Taking the division of a 10 days scheduling cycle into 11 time periods as an example, the first feasible scheduling scheme was obtained in 0.64 seconds. This scheme ensures that the downstream production is carried out within the range of upstream resource supply and fully matches the operational characteristics of long-distance pipelines. During the scheduling cycle, the two sets of atmospheric and vacuum distillation units maintained continuous and stable operation, with only one oil type switch for each.

OPTIMIZATION AND ENERGY INTEGRATION ANALYSIS ON ADSORPTION-ENHANCED BIOGAS TO HYDROGEN PRODUCTION PROCESS BASED ON THERMODYNAMIC-RESPONSE SURFACE COUPLING

2025, 56(10):  110-118. 

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The equilibrium composition of biogas-to-hydrogen conversion was simulated using Aspen Plus software, and the influence of process parameters on the thermodynamic characteristics and energy consumption distribution of the reaction system was systematically investigated. It was further explored that the enhancement mechanism of adding adsorbents to the hydrogen production process. Subsequently, response surface methodology was employed to construct binary interaction function models for the effects of temperature, pressure, and steam-to-carbon ratio on hydrogen yield and energy consumption, achieving multi-parameter collaborative optimization. Finally, to address the nonlinear relationship between process parameters and target responses, an innovative neural network prediction model was developed and combined with genetic algorithm optimization to determine the optimal process conditions for biogas-to-hydrogen conversion. The results indicate that the optimal conditions for adsorption-enhanced biogas-to-hydrogen conversion are: T = 540 °C, p = 0.1 MPa, n(steam)/n(C) = 3, and n(CaO)/n(C) = 1. Under these conditions, the hydrogen yield reaches 2.38 m³/kg, energy consumption is 3.76 MJ/m³, and the energy conversion efficiency is 91.96%. The neural network model achieved a fitting accuracy of 0.999 for hydrogen yield prediction. Compared to conventional biogas-to-hydrogen processes, the adsorption- enhanced biogas reforming process demonstrates significant advantages in terms of hydrogen yield and energy consumption control.

STUDY ON DECARBONIZATION PATHWAY OF OVERALL PROCESS IN AN OIL REFINING ENTERPRISE

2025, 56(10):  119-124. 

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Oil refining enterprises urgently need to reduce CO₂ emissions to meet the requirement of the “carbon peak and carbon neutral targets”. Decarbonization measures maintain current operating conditions unsurely result in loss of benefits. By using overall process optimization, the pathway of the Decarbonization measures with least environmentally expensive can be found out. For a typical 10 Mt/a refinery, the overall process model was integrated with the carbon emission model. The quality stream, energy stream and carbon stream in the whole plant were optimized synergistically, and the effects of selected Decarbonization measures were quantified and evaluated.The results show that measuresincluding optimizing the processing direction of material and gradient utilization of hydrogen are effective for reducing CO₂ emission and comprehensive energy consumption. Among them, in terms of processing direction of material, shortening the processing flow of hydrogen-containing gas and heavy oil is recommended as a priority. For gradient utilization of hydrogen, each ton of reformer hydrogen utilized in this case could reduce 0.51 tons of carbon emission for the refinery. The present work provides guidance for refineries to reduce CO₂ emission by optimizing the overall process.

STUDY ON INFLUENCE OF IMPURITIES IN RAW MATERIALS ON DRAINAGE QUALITY FROM ELECTRIC DESALINATION UNIT

2025, 56(10):  125-130. 

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With the deterioration of petroleum resources, the drainage quality from crude oil electric desalination unit is prominent. The atmospheric and vacuum distillation unit of a petrochemical company was taken as an example to study the influence of petroleum impurities on the quality of electric desalination drainage. Through the analysis of the causes of excessive drainage, it was determined that the main influencing factors were the increase of metal Fe ions, the content of mechanical impurities in the raw materials and the high water content of the raw material tank, and the secondary factors included the increase of the alkalinity of the water injection and the content of suspended solids. Through qualitative and quantitative analysis of the influence degree of various factors, and taking control measures such as preset boundary values, increasing the frequency of raw material analysis, and reducing the water content of raw materials, the electric desalination drainage of the unit can meet the requirements of the discharge standards. The research results provide a reference for optimizing the electric desalination process and improving the quality of drainage, which is of great significance for the green and sustainable development of the oil refining industry.

VOCs EMISSION CHARACTERISTICS, OZONE GENERATION AND HEALTH RISK ASSESSMENT IN PETROCHEMICAL ENTERPRISES

2025, 56(10):  131-139. 

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In order to explore the emission characteristics and secondary pollution of volatile organic compounds (VOCs) from petrochemical enterprises, based on the distribution of the oil transportation pipeline network, a large petrochemical enterprise in the south, north and central China was selected as the research object to analyze the concentration characteristics and treatment efficiency of its organized emissions, collect data from the flare emission components monitored by southern enterprises, and carry out research on the component characteristics, ozone generation potential (OFP) and health risk assessment. The results showed that the organized outlets of the three enterprises all met the discharge standards, and the concentration was 0—85.16 mg/m³. The inlet concentration of some treatment facilities could be detected, and the concentration range was 20.08—245 071.11 mg/m³. The removal efficiency of biological treatment facilities was low, about 30%, and the removal efficiency of CO was high, both of which were greater than 99%. The proportion of alkanes emitted from the flare of southern enterprises exceeded 60%. The main components of flare combustion 1 were isobutane and n-butane , while the main components of flare combustion 2 were hexane and heavier, all pentene, all butene, n-pentane and isopentane. The OFP value of flare emissions ranged from 1.32 kg/m³ to 16.95 kg/m³, with olefins accounting for more than 76% of the total, and ethylene and all butenes accounted for the largest contribution rate of the second combustion, respectively. The human health risk assessment shows that the concentration of 1,3-butadiene is greater than 1.42×10^-2 mg/m³ and the LCR value is between 1×10^-5 and 1×10^-4 within the range of 300 m to 600 m from the torch, which is a high probability carcinogenic risk. In addition, there is a low probability carcinogenic risk within the range of 200 m to 15 000 m from the torch, and the rest are negligible risks. Enterprises need to include 1,3-butadiene in the carcinogenic risk species for control.

RESEARCH PROGRESS OF RUTHENIUM-BASED CATALYSTS IN AMMONIA SYNTHESIS AND DECOMPOSITION

2025, 56(10):  140-151. 

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Hydrogen is regarded as one of the most promising clean energy sources for the future due to its high energy density and zero carbon emissions during combustion. Ammonia, as an efficient hydrogen carrier, has demonstrated broad application prospects in hydrogen storage technologies. Ruthenium-based catalysts have attracted significant attention in the fields of ammonia synthesis and decomposition owing to their outstanding catalytic performance. Based on this, this review summarizes recent advances in the synthesis methods of ruthenium-based catalysts and the key factors influencing their performance. It further explores the catalytic mechanisms of ruthenium-based catalysts in ammonia synthesis and decomposition processes, with a particular focus on the effects of particle size, support type, and promoters on catalytic activity, aiming to provide a reference for the development of efficient ruthenium-based catalysts.

PROGRESS OF HEXAMETHYLENEDIAMINE SYNTHESIS TECHNOLOGY

2025, 56(10):  152-159. 

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Hexamethylenediamine is an important raw material for the production of nylon 66 and other products. It has great application potential in chemical fiber, electronic industry and polymer materials.This paper reviews the hydrogenation of adiponitrile, caprolactam and hexanediol amination, and the advantages and disadvantages of each technical route were analyzed. The "blowout" growth of domestic caprolactam production capacity makes it economically possible to industrialize the process of preparing hexanediamine from caprolactam via ammoniation and hydrogenation. However, technical bottlenecks such as poor product selectivity, susceptibility to coking and short catalyst lifetime due to the uncoordinated reaction-diffusion coupling still need to be solved.

RESEARCH PROGRESS OF ZEOLITE ADSORBENTS FOR SEPARATION OF C₂ HYDROCARBONS

2025, 56(10):  160-167. 

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The efficient separation of ethane, ethene, and ethyne represents the pivotal yet unresolved technical challenge in the chemical industry. While conventional high-pressure cryogenic distillation enables component isolation, its substantial energy demands critically hinder sustainable industrial development. In the context of the "Dual Carbon" strategic initiative, zeolite-based adsorption separation technology has emerged as a prominent research frontier owing to its energy-efficient operation, exceptional selectivity, and environmentally friendly characteristics. This review systematically summarizes recent cutting-edge advances in zeolitic adsorbents for C₂ hydrocarbon separations, elucidates fundamental structure-activity relationships and separation mechanisms, and points out that rational engineering of zeolitic pore microenvironments, development of precision-controlled multicomponent separation systems, and developing scale-up production methods for supporting industrial zeolite adsorbents are key future research directions.