PETROLEUM PROCESSING AND PETROCHEMICALS

DEVELOPMENT AND APPLICATION OF PRT-A/PRT-B SEMI-REGENERATION REFORMING CATALYSTS

2009, 40(7): 1-5. doi:

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Reforming catalysts PRT-A and PRT-B were prepared by using support A and incorporating an third metal component Y. The results of pilot plant lifetime tests showed that as compared with reference catalysts PR-C and PR-D, which represented the same type of word advanced catalysts, catalysts PRT-A and PRT-B exhibited better activity, selectivity and stability. The commercial application results showed that the coking rate of PRT-A/PRT-B catalysts was exceedingly low, which could well meet the requirements of long term operation under severe conditions.

STUDY ON THE STRUCTURE OF MWW CATALYST AND ITS CATALYTIC PERFORMANCE OF BENZENE ALKYLATION WITH ETHYLENE

2009, 40(7): 6-9. doi:

Asbtract ( 1981 )

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A comparitive study of the structure and catalytic performance between self-made MWW catalyst and an imported reference catalyst WBZ-1 was carried out. The catalysts were characterized by means of XRD, SEM, FT-IR, 29Si MAS NMR, PSD and BET. The results showed that MWW catalyst exhibited typical MCM-22 structure and with a morphology of pancake having an average diameter of 4 μm. As compared with the imported reference catalyst, MWW catalyst possessed higher specific surface area and B/L acid sites ratio, but a smaller framework Si/Al ratio and mechanical strength. The catalytic performance of these catalysts for the synthesis of ethylbenzene from benzene and dilute ethene was evaluated and the results showed that the MWW catalyst was more active and selective than the WBZ-1 catalyst. Under the conditions of a reaction temperature of 230oC, a pressure of 2.5 MPa, a LHSV (benzene) of 5 h-1 and a benzene to ethene molar ratio of 4.5, the average conversion of ethene over MWW catalyst was 97.1 %, the average selectivity to ethylbenzene was 97.3% and good catalytic performance could be maintained after running over 1000 h.

PERFORMANCE OF LIP-200B CATALYST FOR MAXIMIZING PROPYLENE YIELD AND HEAVY OIL CONVERSION

Wang Li

2009, 40(7): 10-13. doi:

Asbtract ( 1926 )

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The catalytic performance of LIP-200B, a catalyst newly developed by Lanzhou Petrochemical Research Center, was evaluated on a riser pilot plant and using commercial LBO-12 catalyst as reference catalyst. The test results showed that as compared with LBO-12 catalyst, LIP-200B catalyst exhibited better propylene selectivity, heavy oil conversion and resistant to heavy metal contamination, such as with less slurry oil yield, the yields of LPG and propylene increased 3.29 and 1.43 percentage points, respectively. Furthermore, the pilot plant test results were in good agreement with the commercial trial data.

COMMERCIAL APLICATION OF RS-1000 CATALYST ON DIESEL FUEL HYDROTREATING UNIT AND A DISCUSSION OF UPGRADING DIESEL FUEL

Xun-Cheng Chen He Zong-Fu

2009, 40(7): 14-17. doi:

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The performance test results (SOR and EOR) of RS-1000 catalyst were presented and the upgrading of diesel fuel quality in Hainan Petrochemical Company was discussed. Results showed that using mixed feed of straight run diesel and FCC LCO over RS-1000 catalyst, under a higher LHSV of 3.0h-1 or a conventional LHSV of 2.1h-1, diesel fuel with sulfur content of less than 350 μg/g or less than 50 μg/g could be produced, respectively.

DISCUSSION ON THE DEOXIDATION OF CCR CATALYST IN THE UNIT USING UOP REGENERATION TECHNOLOGY

2009, 40(7): 18-22. doi:

Asbtract ( 1911 )

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The deoxidation process of the CCR catalyst regeneration at SINOPEC Yangzi Petrochemical Company was discussed. It was found that low hydrogen purity and high moisture content of the hydrogen used for deoxidation was the main cause. Countermeasures such as exhausting 90% of the waste gas from the deoxidation process to hydrogen recompression system to reduce the water content in deoxidation zone, and using hydrogen from PSA unit to replace recycle hydrogen to increase the hydrogen purity, were adopted. Since then the activity of the regenerated catalyst was improved and the aromatics yield was increased. Suggestions in daily operation and maintainance were proposed as well.

ANALYSIS ON THE FORMATION AND CONVERSION MECHANISM OF SULFUR COMPOUNDS IN FCC NAPHTHA

YU Shan-Qing

2009, 40(7): 23-27. doi:

Asbtract ( 1820 )

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The formation and conversion mechanisms of sulfur compounds of naphtha in FCC units are reviewed. Several conversion approaches of thiophenic compounds are focused and the main reactions on the acid sites of catalysts are mentioned. Finally, the reaction network concerning the conversion and formation of sulfur compounds in FCC naphtha is presented. It can be seen that thiophene and alky-thiophene are converted to large sulfur-containing molecules by alkylation and cyclization/dehydrogenation reactions, hydrogen transfer reactions result in the conversion of sulfur compounds to form H2S, and simultaneously H2S and olefins will react to form thiophenic compounds. Based on the above investigation, some effective suggestions to reduce the sulfur content in FCC naphtha are proposed, which will be helpful for developing new desulfurization catalysts.

DEACTIVATION MODEL OF HYDROTREATING CATALYST FOR ULTRA LOW SULFUR DIESEL FUEL PRODUCTION

2009, 40(7): 28-30. doi:

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The deactivation tests of hydrotreating catalyst for ultra low sulfur diesel fuel (ULSD) production were carried out in order to set up a catalyst deactivation model. Test results showed that the catalyst deactivation experienced an initial rapid deactivation stage and followed by a mild continued deactivation stage, which passed a long period of time and the catalyst activity reduced slowly. The continued deactivation was caused by losing active sites due to coke deposition. Based on the correlation between catalyst deactivation rate constant and feedstock properties a ULSD hydrotreating catalyst deactivation model was established. The reliability of the model was validated by experiments and the average relative error between predicted value and test data was less than 5%, indicating that the model was feasible.

COKING AND REGENERATED BEHAVIORS OF 5A MOLECULAR SIEVE IN SEPARATION OF REFORMATE RAFFINATE AND ITS MICROSTRUCTURE ANALYSIS

Ben-xian Shen

2009, 40(7): 31-35. doi:

Asbtract ( 1886 )

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In order to prolong the running cycle of producing high purity n-hexane from reformate raffinate through adsorption-distillation technology, coking of olefins in the channels of 5A molecular sieve and regeneration of coked 5A molecular sieve were studied by microstructure analysis. Results indicated that the existence of olefins in the reformate raffinate was the major factor engendering the deactivation of 5A molecular sieve. For the coked 5A molecular sieve, using air as regeneration gas at a space velocity of 720h-1, a regeneration temperature of 350℃ and a regeneration time of 1h, the activity of the regenerated molecular sieve could reach 96% of that of the fresh one. The analysis results of specific surface area, pore size and pore volume showed that the microstructure of the regenerated molecular sieves was close to that of the fresh one.

STUDY ON THE LUBRICITY OF HYDROCRACKED DIESEL FUEL IN THE PRESENCE OF ANTI-WEAR ADDITIVE WITH LOW ACID VALUE SYNTHESIZED FROM RICINOLOEIC ACID

Bao-hua Lin Ben-xian Shen

2009, 40(7): 36-39. doi:

Asbtract ( 1955 )

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The lubricity of hydrocracked diesel fuel in the presence of carboxylic acids with carbon number of 18 was investigated by using high-frequency reciprocating rig (HFRR) test. Several monoesters of ricinoloeic acid were synthesized by esterification, their acid vales and effect of the lubricity on diesel fuel were also studied. Results indicated that the lubricity of hydrocracked diesel fuel improved by home-made additive was slightly better than that by the imported one, while the acid value of the home-made one was just about 50% of the imported one. When the added dosage of the home-made additive was in the range of 200-500 μg/g, the physical properties of the hydrocracked diesel fuel was basically unchanged.

SYNTHESIS AND APPLICATION OF POLYETHERAMINE AS DETERGENCY OF GASOLINE

2009, 40(7): 40-43. doi:

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A kind of polyetheramine was synthesized by high pressure catalytic amination.Effects of the reaction conversion in temperature，pressure and time were investigated.In the presence of H2 and catalyst, temperature of 220 ℃, pressure of 13.5 MPa, and reaction time of 4 h, the conversion of the polyether was above 95 %. The product was characterized by IR. The results of simulated experiments and engine bench scale tests show that the polyetheramine have the outstanding lustration performance of engine intake valve, besides also can restrain the production of combustion chamber deposit effectively.

MANUFACTURE OF FOOD GRADE WHITE OIL WITH MEDIUM-HIGH VISCOSITY BY HYDROFINING PROCESS

2009, 40(7): 44-46. doi:

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Using noble metal catalyst (RLF-10) developed by Research Institute of Petroleum Processing and base oil from the high-pressure hydrogenation unit of Karamay Petrochemical Company, food grade white oil with medium-high viscosity could be produced. The product quality such as key indexes, easy carbide and ultraviolet absorbance, well met the requirements of GB4853-94 Standard.

STUDY ON THE CATALYTIC OXIDATION OF PARAFFIN WAX OVER Co/SBA-15 CATALYA

2009, 40(7): 47-50. doi:

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Study on the oxidation of paraffin wax was carried out by using 52# wax as raw material, Co/SBA-15 as catalyst and air as oxidant. The effects of reaction temperature, reaction time and air flux on the oxidation of wax were investigated. The experimental results indicated that under the optimal reaction conditions of using a Co/SBA-15 catalyst with an optimal Co2O3 loading of 15%, an oxidation temperature of 140℃, an oxidation time of 5h and an air flux of 0.6 L/min, a high acid number, light color and less odor oxidized wax was obtained.

FACTORS IMPACTING ON THE EFFICIENCY OF DIELECTROPHORESIS TREATING OF DIESEL FUEL

CHEN Hui-Ying

2009, 40(7): 51-54. doi:

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According to the principle of dielectrophoresis (DEP), the factors having effects on the efficiency of removing particles in hydrogenated diesel fuel by DEP process were studied. It was found that the efficiency of particles removal in hydrogenated diesel with DEP process went higher with the increase of dielectric constants of ceramics to a threshold value of 12 000. Beyond the threshold value, the efficiency decreased with further increase of dielectric constants of ceramics used in the process. The effect of separation voltage on refining efficiency was analyzed as well. Under the optimum refining conditions of a dielectric constant of 12 000, a separation voltage of 4 000V and a flowrate of 36.4 mL/min, the particles removal rate of hydrogenated diesel was as high as 99.33%. After refining, the treated diesel could meet the 2nd class requirement of solid particles standard.

APPLICATION OF DATA MINING OPTIMIZATION SOFTWARE IN THE COMMERCIAL OPERATION OF ABSORPTION AND STABILIZATION SECTION IN FCC UNIT

2009, 40(7): 55-58. doi:

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DMOS（Data Mining Optimization System) software, a dedicated tool for data mining, was used to analyze the commercial operation in the absorption and stabilization section of FCCU in SINOPEC Cangzhou Company, particularly, the problem of excessive high vapor pressure of the stabilized gasoline. After analyzing the operation data, five major factors such as the top and bottom temperature of the stabilizer, pressure and reflux temperature were focused and an optimization plan was then obtained. After applying this plan in operation, decreasing of the vapor pressure of stabilized gasoline was observed.

STUDY ON THE ADSORPTION PROPERTIES OF A NEW ADSORBENT HBY-1 FOR OIL VAPOR RECOVERY

2009, 40(7): 59-63. doi:

Asbtract ( 1887 )

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The adsorption and desorption properties of a new adsorbent HBY-1 for recovering oil vapor were studied. Results show that under the conditions of room temperature, a toluene concentration of 10 000 μL/L, a space velocity of 200~400h-1, a desorption time of 2h and a desorption temperature of 22 ℃, the adsorption capacity of HBY-1 for toluene is 28.0% and desorption rate reaches 23.0 g/h which is higher than that of activated carbon (11.6 g/h); under the conditions of oil vapor concentration of 140 000 μL/L, the desorption rate of HBY-1 for oil vapor is 18.0g/h which is higher than that of activated carbon (12.0%), and the adsorption heat of the new adsorbent is 17.1 kJ/mol lower than that of activated carbon. It can be seen that adsorbent HBY-1 is more effective in recovering oil vapor and safety in use.

SCREENING AND ACCLIMATING OF OPTIMUM STRAINS FOR THE DEGRADATION OF ALKALINE WASTEWATER FROM OIL REFINERY

2009, 40(7): 64-69. doi:

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In view of solving the pollution problem of waste alkali liquor in oil refineries, 5 optimized strains were screened and domesticated from refinery sludge for the degradation of alkaline wastewater. It can be seen that the degradation performance of these 5 strains was significant by comparing the chemical oxygen demand (COD) value. The degradation process conditions of the optimized strains in biotreating alkaline wastewater were also discussed. Test results showed that under the optimum treating conditions of a pH value of 7, a treating temperature of 35℃ and the added amount of nutrients were 0.8% of corn meal, 0.8% of MgSO4•7H2O and 1.0% of corn steep liquor, the COD removal rate of alkaline wastewater reached 81.2% by using TK07-5 strain for 72h.

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