PETROLEUM PROCESSING AND PETROCHEMICALS

AN INTRODUCTION TO REFINING-PETROCHEMICAL INTEGRATION THROUGH A RECENT PROJECT

2010, 41(8): 1-5. doi:

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The design of a recent ethylene project adopted the philosophy of refining-petrochemical integration was introduced. This design concept was applied throughout all aspects of the project, such as optimizing process configuration, general site layout plan, design of utility island, auxiliary facilities, information management system and so on. In particular, the utility island was built around a POx/ steam power CO-GEN unit to supply partial hydrogen, steam, and electricity demand of the plant. This design is the first of its kind in any existing domestic refineries and petrochemical complexes. The successful application of the design concept helps cut project CAPEX, lower production cost and minimizing investment risk. In addition, the integrated utility island design was a technology breakthrough and innovation for domestic petrochemical industry.

OPTIMIZING THE FLOW DIRECTION OF HYDROTREATED COKER GASOLINE

LONG Wei-Can

2010, 41(8): 6-10. doi:

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The problems existed in the flow direction of hydrotreated coker gasoline of SINOPEC Changling Company were discussed and analyzed. Optimization of the hydrotreated coker gasoline flow direction was carried out by fully utilizing the present plant capacity with minimum investment, adjusting operation conditions and altering product configuration. Successful results were obtained such as an economic benefit of 25.40 million RMB was achieved in 2007.

STUDY ON THE DECOLORIZATION PROCESS FOR THE DISTILLATION BOTTOM PRODUCT OF HEAVY ALKYL BENZENE

2010, 41(8): 11-15. doi:

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In order to improve the quality and application scope of the distillation bottom product of heavy alkyl benzene (HAB), three decolorization methods including adsorption (using clay or activated carbon as adsorbent), catalytic hydrogenation and the combination of adsorption and hydrogenation, were investigated. By studying factors affecting the decolorization, it was found that both adsorption and hydrogenation methods were effective when the colourity of HAB was moderate, and between the two adsorbents the decolorization performance of activated carbon was better. Anyway, when the colourity of HAB was poor, good decolorization performance could be observed only with the combination method.

APPLICATIONS OF MIP TECHNOLOGY ON A 0.6 Mt/a FCC UNIT

Zhang-Hua

2010, 41(8): 16-20. doi:

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In order to reduce the olefin content in FCC gasoline, the 0.6 Mt/a FCC unit of Yulin Refinery was revamped with MIP technology. After the revamping, the unit exhibited improved heavy oil crackability and moderate hydrogen transfer performance. Under the similar feedstock compositions and properties as compared with prior to revamping, the yields of gasoline and diesel fuel increased, the olefin content in FCC gasoline reduced significantly, the yields of LPG and slurry oil decreased, as well as the dry gas and coke yields decreased a little, the total liquid yield increased and the product distributions were good. Besides, the total energy consumption reduced 182.11 MJ/t after revamping.

INDUSTRIAL APPLICATION OF SINGLE STAGE REACTION SEQUENCED (SSRS) PROCESS IN A HYDROCRACKING UNIT

2010, 41(8): 21-24. doi:

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Single stage reaction sequenced (SSRS) process developed by Chevron Lummus Global was introduced as the first industrial application case in the 1.5 Mt/a hydrocracking unit of Dalian West Pacific Petrochemical Company. With Chevron’s ICR series catalysts and using Middle-East VGO as feedstock, the unit was operated under full recycle to obtain maximum middle distillats at a temperature range of 350~390℃ and a pressure of 14.6 MPa. The performance test results showed that with 100% conversion, the yield of middle distillates reached 83.1%; the smoke point of aviation fuel was 30 mm, the sulfur content of heavy diesel fraction was less than 10 g/g and its cetane index was 61. Furthermore, the energy consumption of the unit was 61.3 MJ/t lower than the design data.

APPLICATION OF HIGH OCTANE CLEAN GASOLINE PRODUCTION TECHNOLOGY IN YUMEN REFINERY

Tian-ping Duan

2010, 41(8): 25-28. doi:

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Some technical measures, such as optimizing FCC feedstocks, altering the end point of FCC gasoline, adopting DSO hydrogenation technology for FCC gasoline, setting up MTBE unit, isomerization unit and benzene extraction unit, were conducted in Yumen Refinery to meet the requirements of upgrading gasoline quality. Since then the gasoline quality was improved significantly: the RON of gasoline product increased from 91.95 to 94.27 and sulfur content dropped from 287.60 μg/g to 31.50 μg/g, meeting the requirements of high grade clean gasoline standard.

STUDY ON THE AGGLOMERATION AND REDISPERSION OF Pt CRYSTALS IN INDUSTRIAL CCR CATALYSTS

Ma Aizeng

2010, 41(8): 29-33. doi:

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The research results showed that the agglomeration of Pt crystal particles were one of the main reasons for the poor catalytic performance of CCR catalyst in industrial reforming unit. The redispersion of agglomerated Pt crystals was studied. It was found that some slightly agglomerated Pt crystals could be redispersed under certain treating conditions, and the catalytic performance of the treated catalyst was enhanced, yet except catalysts having serious Pt agglomeration or structure changed.

COMMERCIAL APPLICATION OF PS-Ⅵ REFORMING CATALYST WITH REGEN CⅡCONTINUOUS REGENERATION TECHNOLOGY

2010, 41(8): 34-37. doi:

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The commercial application of PS-Ⅵ CCR catalyst developed by Research Institute of Petroleum Processing (RIPP) was carried out on the 600 kt/a CCR unit in the No.3 Refinery of Fushun Petrochemical Company. The results show that, PS-Ⅵ reforming catalyst exhibits excellent abrasion performance, high hydrothermal stability and good chlorine-retaining capability; compared with the catalyst used previously, the performance of PS-VI catalyst seems better: aromatics yield increased 4.9 percentage points and the RON of stabilized gasoline increased 3.4 units.

HYDROCRACKING PERFORMANCE OF A COMPOSITE ZEOLITE CATALYST

MA Shou-Tao

2010, 41(8): 38-41. doi:

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Composite molecular sieve MCM-41-HY having mesoporous and microporous pore structure was prepared by hydrothermal method and the structure of the composite molecular sieve was characterized. A MY-1 catalyst was prepared using said synthesized composite sample as the main cracking component, nickel and tungsten was impregnated. The catalytic performance of MY-1 catalyst was studied on a 200 ml fixed-bed hydrogenation unit using Daqing VGO as feedstock. The results showed that with a 75% conversion of the feedstock over 350℃ fraction, the C5+ liquid yield was 98.89%, the yields of diesel fraction (138-370℃) was 68.7% and the selectivity of middle distillates was 83.21%.

OXIDATIVE DEHYDROGENATION OF n-BUTANE ON MgO-MODIFIED VOx/SiO2 CATALYST

Jiang-Yin LU

2010, 41(8): 42-46. doi:

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Oxidative dehydrogenation of n-butane to butene was carried out over VOx/SiO2 catalyst. The effect of VOx loading amount and adding MgO on the catalytic behavior of the catalyst was investigated. Results showed that as considering the reactant conversion and objective products selectivities comprehensively, the optimal VOx loading amount was 3%; adding MgO to VOx/SiO2 catalyst could enhance the slectivities of n-butene and 1,3-butadiene, side reactions such as cracking of n-butane could be suppressed and the total yield of butenes was increased.

AN ANALYSIS OF ENERGY BALANCE IN ATMOSPHERIC AND VACUUM DISTILLATION UNIT OF REFINERIES

2010, 41(8): 47-49. doi:

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An energy consumption evaluation model for atmospheric and vacuum distillation unit of refineries was set up and the model was used to analyze the energy balance of a case unit based on its operation data. From this analysis, the evaluation indexes of energy utilization for the unit and relative devices were obtained, and a comprehensive evaluation was made for the status of energy consumption. The amount, causes and distribution of energy consumption were discussed, the weak parts of energy using were found and some suggestions for energy conservation were proposed. This energy consumption evaluation model is simple and easy to be used; furthermore, the error of data obtained from this model and the standard calculation results is about 2.4%, indicating this method is reliable.

OPTIMIZATION STRATEGY RESEARCH OF TRANSFERRING HOT FEED BETWEEN REFINING UNITS

Ben Hua

2010, 41(8): 50-55. doi:

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This paper presents the optimization strategies of energy utilization in refineries base on transferring high temperature intermediate streams between units, such as optimizing energy consumption of individual processing unit, properly adjusting heat exchange network and integrating the heat utilization among units. The aim is to impel energy saving from units to the whole system optimization. The proposed strategy was applied to one CDU and FCC unit modification case. The result shows that the energy consumption of upstream and downstream units is decreased. Because the intermediate stream is fed straightly, the energy consumption of intermediate product tank and circulating fund of the storage and transportation are reduced. Changing or adding heat exchanger and pipe-line is just needed in this revamping case. The total investment is 10.14 million RMB, but the economic benefit is 22.52 million RMB annually, thus the capital pay-off time is less than 6 months. It is demonstrated that the energy optimization base on transferring hot feed between units is a way of low input and high output, which is significance for the coming turn of energy saving.

USING HOT FEED FROM UPSTREAM TO UPGRADE THE OPTIMIZATION OF ENERGY CONSERVATION IN HYDROTREATING UNITS

Zhang Gao-Bo,Ben Hua

2010, 41(8): 56-61. doi:

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A method to promote the total system optimization of hydrotreating units by means of taking hot feed from upstream directly was introduced. Based on “Three-Link-Theory” energy structural model, by optimizing distillation towers, heat exchang network, furnace and compressors/pumps to realize upgrading the utilization of low grade heat from upstream hot feed, the fuel of furnace and the steam of reboiler were saved. From a case study of a 1.0 Mt/a diesel fuel hydrotreating unit in a SINOPEC refinery, it can be seen that a 38.9% reduction of energy consumption was obtained. This method could also be used to other downstream units for total optimization of energy conservation.

DEVELOPMENT AND APPLICATION OF OPTIMUM SWITCHING SCHEME SYSTEM FOR TRANSPORTING AND PROCESSING CRUDE OIL SEPARATELY

zigang wang, Zeng Su-Zhu,zhenan bai,yujun zhao

2010, 41(8): 62-65. doi:

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Using PIMS software platform and based on the processing data of a refinery to adjust the PIMS model system, an optimum switching scheme system for transporting and processing crude oils separately was developed. Simulating calculation for a 6/4 days switching scheme was carried out. Results showed that said model could be used to make detail plan and scheduler for transporting and processing crude oils separately; it could also be helpful to find out the bottleneck of the plan, and thus ensuring a long-term smoothly running of the scheme. It could also provide reference data for making mid and long term investment of the enterprise.

SYNTHESIS AND CHARACTERIZATION OF 9-METHYL BENZOATE FLUORENE

xu zhao-hui

2010, 41(8): 66-69. doi:

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9-methylbenzoate fluorene (as polypropylene catalyst internal donor) was synthesized from 9-hydromethylfluorene (A) and benzoyl chloride (B) with N(CH2CH3)3 as absorbent. The structure of 9-methylbenzoate fluorene was characterized by means of FT-IR and 1HNMR. The effects of reactants mole ratio, absorbent dosage, reaction temperature and reaction time on the yield of 9-methylbenzoate fluorene were investigated. Results showed that under the optimal reaction conditions of a A dosage of 0.1 mol, a A/B mole ratio of 0.5, a N(CH2CH3)3 dosage of 40 mL, a reaction temperature of 10℃ and a reaction time of 5.0 h, the yield of 9-methylbenzoate fluorene reached 87.3%.

PREPARATION OF MoP/TiO2-SiO2-Al2O3 CATALYSTS AND THEIR HYDRODENITROGENATION PERFORMANCE STUDY

Gu Yong-He

2010, 41(8): 70-74. doi:

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MoP/TiO2-SiO2-Al2O3 catalysts with various TiO2 contents were prepared by in-situ sol-gel method．The hydrodenitrogenation ( HDN) activity of the catalyst was evaluated on a fixed-bed reactor using quinoline as model compound, under a reaction temperature range of 300～400℃ and a reaction pressure of 3 MPa．Results showed that TiO2 content had significant influence on the specific surface area, pore volume and pore diameter of the support．Optimal HDN activity was obtained over MoP/TiO2-SiO2-Al2O3 catalyst with n(Ti)：n (Al)：n(Si) of 1:4:1．Adding promoter Co could enhance the HDN activity of the catalyst，at an optimal Co content of 2% all the quinoline molecules in the model feed could be removed.

THE VARIATION OF EXISTENT GUM IN GASOLINE HAVING DETERGENT DURING LONG-TERM STORAGE

2010, 41(8): 75-78. doi:

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Using 43℃accelerated oxidation storage method to study the variation of existent gum in gasoline having detergent during long-term storage was carried out. Results showed that storage time had significant effect on the existent gum of gasoline having detergent, followed by the quality of blank gasoline and the type of detergent. When adding detergent into gasoline with poor stability, the existent gum increased linearly with storage time. However, detergent could help dispersing the gum precursor to inhibit the formation of gum and thus, the storage stability of gasoline having detergent was improved.

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