Table of Content

12 February 2008, Volume 39 Issue 2

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催化剂

DEVELOPMENT OF BOTTOMS CRACKING FCC CATALYST FOR REDUCING SULFUR CONTENT OF NAPHTHA

2008, 39(2):  1-5.  doi:

Asbtract ( 1815 )  

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DOS series FCC catalysts was developed for reducing sulfur content of FCC naphtha during bottoms cracking. The preparation of DOS catalyst involved a new Lewis acid-alkali compound and modified Y zeolite. The catalytic performance of the catalyst was evaluated by MAT, ACE device and fixed-fluidized bed unit. The test results showed that the Lewis acid-alkali compound could enhance the transferring of large sulfur compounds from FCC naphtha, and the optimum coordination of zeolite with said component could keep the contents of olefin and sulfur in naphtha low. Results also showed that the heavy oil yield was lower; the catalyst was more tolerance to metal contamination, and the sulfur content in naphtha reduced by 20% as compared with a commercial catalyst for reducing olefin content of naphtha.

STUDY ON THE ACID MODIFIED SEPIOLITE AND ITS APPLICATION IN FCC CATALYST MATRIX

2008, 39(2):  6-11.  doi:

Asbtract ( 1812 )  

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Modification of sepiolite by hydrochloric acid, sulfuric acid and nitric acid was carried out. The results showed that hydrochloric acid was suitable for the modification of sepiolite on the whole. The effects of acid concentration, treating temperature and treating time on the Mg removal rate of sepiolite were studied and the modified sepiolite samples were characterized by XRD, FT-IR and TGA. The specific surface area, pore volume and Mg removal rate of sepiolite samples were increased with the increase of acid concentration, treating time and treating temperature. Under the optimum conditions of using 1 mol/L HCl acid, treating at 80 ℃ for 2.5 h, the Mg removal rate of sepiolite was about 27%. The modified sepiolite sample was used as main matrix component in the preparation of FCC catalyst samples and the catalysts properties were compared. The specific surface area, pore volume and mesopore volume of the catalysts having acid modified sepiolite were larger as compared with catalyst having kaoline matrix. Besides, said catalyst was more metal tolerance due to the incorporation of MgO from the modified sepiolite.

A STUDY OF SELECTIVE OXIDATION OF CYCLOHEXANE OVER Au-Co/ZSM-5 CATALYST

2008, 39(2):  12-15.  doi:

Asbtract ( 1906 )  

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Selective oxidation of cyclohexane with air to form cyclohexanol and cyclohexanone over Au-Co/HZSM-5 catalyst prepared by impregnation-precipitation method was investigated, and without organic solvent or activator was involved. Results showed that the best activity was obtained with a catalyst having cobalt and gold dosage of 5.0% and 0.3%, respectively. Using such catalyst under the conditions of a reaction pressure of 4.0 MPa, a reaction temperature of 410 K and a reaction time of 300 min, the conversion of cyclohexane reached 12.4% and the total selectivity to cyclohexanol and cyclohexanone was 95.3% with a ratio of cyclohexanone to cyclohexanol of 2.6. The catalyst could be reused through washing and its activity was slightly decreased after four runs.

PREPARATION OF MoP/TiO2-ZrO2 HYDRODESULFURIZATION CATALYST

shi yan

2008, 39(2):  16-20.  doi:

Asbtract ( 1683 )  

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A TiO2-ZrO2 complex support was prepared by modified sol-gel method, and active components was co-impregnated on the support to form MoP/TiO2-ZrO2 catalyst. The catalyst was in-situ reduced, and its desulfurization activity was evaluated in a fixed bed reactor. The test results showed that as compared with catalyst using TiO2-Al2O3 support the desulfurization rate of the catalyst using TiO2-ZrO2 support was 11.0 percentage points higher. The catalyst activity was affected by the Ti/Zr mole ratio and the Mo loading amount significantly. It was shown that MoP/TiO2-ZrO2catalyst having a Ti/Zr mole ratio of 2 and a Mo loading amount of 20% exhibited the best HDS activity, its sulfur removal rate reached 99.34%.

加工工艺

CAPACITY EXPANSION OF A 0.15Mt/a AROMATICS EXTRACTION UNIT

2008, 39(2):  21-25.  doi:

Asbtract ( 1662 )  

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An effective capacity expansion program was proposed and put into practice to solve the production bottleneck existed in the 0.15Mt/a aromatics extraction unit of Dalian Petrochemical Company. After revamping the unit throughput reached 20.54 t/h and it was 15% over the design target; the purity of benzene was more than 99.9%; the benzene content in raffinate oil was less than 0.5%; the operation was stable and the co-solvent consumption was reduced significantly.

PREPARATION OF AROMATIC SOLVENT NAPHTHA BY C9 FRACTION FROM ETHYLENE CRACKING UNIT

2008, 39(2):  26-30.  doi:

Asbtract ( 2840 )  

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The preparation of aromatic solvent naphtha by two-stage polymerization over Lewis acid catalyst was studied using C9 fraction, the by-product of ethylene cracking unit, as feedstock. The effects of catalyst dosage, reaction temperature and reaction time on the product distributions were investigated. Results showed that under the conditions of a reaction temperature of 60℃, a reaction time of 6 h and a catalyst consisted of 1.0% BF3-ether and 1.5% AlCl3, the yields of aromatic solvent naphtha and petroleum resin reached 71.1% and 20%, respectively. The qualities of the obtained solvents (cut to 120# and 200#) could meet the requirements of trade standard SH0005-90.

INTEGRATIVE OPTIMIZATION OF FCC ABSORPTION-STABILIZATION SYSTEM AND LIGHT ENDS UNIT

2008, 39(2):  31-33.  doi:

Asbtract ( 1804 )  

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In order to reduce the loss of propylene, an integrative optimization of FCC absorption-stabilization system and gas fractionation device was conducted at Karamay Petrochemical Company. The ethane content in LPG was kept below 0.5% by optimizing the operation conditions of FCC absorption and stabilization system, thus the de-ethane tower could be cut off from the gas fractionation device to avoid the loss of propylene from the discharged ethane stream. The running results showed that the propylene yield increased 1.69 percentage points, the propylene recovery rate increased 6.79 percentage points and the energy consumption was lowered.

EXTRACTING SEPARATION AND APPLICATION OF FCC SLURRY FROM VARIOUS BASE CRUDE OILS

yang ji-he

2008, 39(2):  34-38.  doi:

Asbtract ( 2408 )  

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A new type of solvent was used to extract and separate FCC slurry to saturated hydrocarbons and aromatic hydrocarbons. Three kinds of FCC slurries from various crude oils were involved including naphthenic, intermediate and paraffinic base. The solvent performance, extracting conditions, the properties of extract and remainder, and the application of these two streams were investigated. Results showed that said solvent could effectively separate the three kinds of FCC slurry, yet the extraction conditions and product yields were a bit varied. The obtained aromatic hydrocarbons stream was cut into three fractions for the use of rubber softener, rubber filler and asphalt blending component. The qualities of rubber softener and rubber filler from naphthenic and intermediate FCC slurry could meet the requirements of the relative product standards; the products from paraffinic FCC slurry still needed to be improved. The solid particles in the FCC slurry were transferred into the saturated hydrocarbons stream, and said stream could be used as FCC feedstock. Furthermore, the saturated hydrocarbons obtained from paraffinic base slurry could be used as feedstock of lubricant and wax.

基础研究

STUDY ON THE EXTRACTION PERFORMANCE OF NEW IONIC LIQUID FOR REMOVING BENZOTHIOPHENE AND DIBENZOTHIOPHENE

PIAO Xiang-Lan

2008, 39(2):  38-41.  doi:

Asbtract ( 2048 )  

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Five kinds of ionic liquid (IL), [bmim]AlCl4, [bmin]TBP, [bmim]BeS, [bmim]PF6, and [bmim]BF4, were synthesized and used to extract Benzothiophene (BT) and Dibenzothiophene (DBT) in model fuels. The desulfurization mechanism of using IL as green solvent was discussed based on intermolecular force theory and valence bond theory, and the extraction performance of the five prepared ILs was compared. Results confirmed that the removal of sulfur compounds was affected by the anion structure of IL, and [bmim]TBP was an effective solvent for removing sulfur compounds comprehensively. Model fuels, octane containing 1 000 μg/g BT or 1 000 μg/g DBT, were treated with [bmim]TBP by 4 stage cross-current extraction or 5 stage counter-current extraction, and the contents of BT and DBT in the model fuels could be reduced to less than 50μg/g, respectively.

Numerical simulation of particle concentration distribution in the vortex quick separation system

2008, 39(2):  42-46.  doi:

Asbtract ( 1873 )  

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Using Eulerian model, the gas-solid flow in the vortex quick separation system (VQS) was numerically simulated and the distribution of particle concentration was investigated. The results indicated that the separation room in the system could be divided into three zones, i.e. spurting zone, separation zone and sedimentation zone. It was found that the separation mechanism was varied in the three zones, and the particle size had influence on the system separation. Base on sedimentation-diffusion theory models for the distribution of particle concentration were set up, providing reference for setting up the separation model of VQS system.

油品与添加剂

INVESTIGATION ON THE APPLICATION OF BEAN OIL AS FUEL FOR DIESEL ENGINE

2008, 39(2):  47-50.  doi:

Asbtract ( 2181 )  

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Bean oil and -10# military fuel was mixed under various ratios, and the feasibility of bean oil used as fuel for diesel engine was studied including comparing their physical-chemical properties, conducting engine test and actual vehicle test. Results showed that using bean oil as diesel engine fuel could reduce the loss of evaporation and increase the lubricity of fuel. A 1 000 km vehicle run with WD615 engine showed that the running performance, coke deposition and wearing behavior were as usual, less smoke was formed due to better combustion.

PREPARATION OF PMMA∕EG HYBRID NANO-COMPOSITE AND ITS ANTI-WEAR PERFORMANCE AS LUBE OIL ADDITIVE

2008, 39(2):  51-54.  doi:

Asbtract ( 1984 )  

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Polymethyl methacrylate∕expanded graphite (PMMA/EG) hybrid nano-composite was synthesized through in-situ emulsion polymerization of methyl methacrylate in the presence of EG. The as-prepared composite was characterized by XRD, FT-IR, TEM and thermal analysis (TGA-DSC). The test results showed that the prepared PMMA∕EG was elliptical, and EG was dispersed in the polymer matrix and enclosed by PMMA. The effect of using said nano-composite as lube additive on the tribological properties of 10# machine oil was investigated using a MWW-1P friction and wear tester. The evaluation results showed that PMMA∕EG exhibited excellent anti-wear behavior under various loads. The optimal dosage of PMMA∕EG in the 10# machine oil was suggested to be 1.5%. The results of EDX showed that a carbon enriched film was formed on the worn steel surface to protect the steel surface for further wearing.

STUDY ON THE THERMAL BEHAVIOR OF CHLORINATED POLYETHYLENE MODIFIED BITUMEN

2008, 39(2):  55-58.  doi:

Asbtract ( 1962 )  

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The thermal behavior of chlorinated polyethylene (CPE) modified bitumen（PMB-CPE）samples were characterized by four components analytical method, TGA and DSC thermal analysis. The result showed that as compared with the base bitumen, the contents of saturates and aromatics in the PMB-CPE decreased; the contents of resin and asphaltene increased. The improvements in thermal stability and temperature sensitivity of bitumen by adding CPE were indicated from the decrease of mass loss rate in the initial thermal decomposition stage and the decrease of endothermic enthalpy, respectively.

分析与评定

CONTINUOUS PULSE MICRO-REACTOR CHROMATOGRAPHY AND ITS APPLICATION IN FCC CATALYST EVALUATION

2008, 39(2):  59-63.  doi:

Asbtract ( 2265 )  

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In conventional catalyst evaluation, products were off-line analyzed, and only average conversion and product distributions were provided without information about the proceeding of catalyst deactivation. In order to obtain more information from the catalyst evaluation, a new method, continuous pulse micro-reactor chromatography, was proposed and put into practice to observe the deactivation of catalyst. The new method could obtain various evaluation information in 20 min (per run), and it could provide some new understandings about the catalyst performance, which was impossible for the conventional methods. Only 5-30 mg sample was needed, and the test was accurate, fast and economic.

RAPID DETERMINATION OF THE VISCOSITY OF AUTOMOBILE LUBE OIL BY DIELECTRIC SPECTROSCOPY

Feng Xin-Lu

2008, 39(2):  64-69.  doi:

Asbtract ( 1954 )  

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Using dielectric spectroscopy (DS) to analyze petroleum products was introduced. Base on the principle component analysis method the differences between low grade and high grade automobile lube oils were identified. A model was set up using partial least squares (PLS) method to predict the viscosity values of lube oil at 40℃ and 100℃ rapidly. When the number of principle components reached 7, the predicted values and the actual measured data were in good agreement having correlation coefficient of 0.999 6 and 0.998 4 for 40℃ and 100℃, respectively; the average prediction error for 40℃ and 100℃ were 1.054 and 0.094 2, respectively. Results validated that the viscosity of lube oil could be measured by DS accurately and rapidly.