PETROLEUM PROCESSING AND PETROCHEMICALS

A STUDY OF MHC UNIT PROCESSING FEEDSTOCK BLENDED WITH HEAVY CONDENSATE OIL

Yuying Zhang,Zhihai Hu

2010, 41(12): 1-5. doi:

Asbtract ( 2018 )

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The effect of heavy condensate oil blending ratio on the product distributions and product quality was investigated on a hydrocracking pilot plant unit. The influence of reaction temperature and LHSV on the product properties was studied. Test results showed that it was feasible to process feedstocks blended with heavy condensate oil in the MHC unit of Huizhou Refinery, and with the increase of heavy condensate oil blending ratio, the operation conditions became moderate. Under an optimum heavy condensate oil blending ratio of 8%, the smock point of kerosene distillate reached more than 25 mm, its ice point was below – 60 ℃, meeting the specifications of 3# jet fuel; the sulfur content of diesel fraction was less than 10 g/g, with a cetane number of 57.9 and without multi-ring aromatic hydrocarbons, meeting the requirements of European V exhaust standard for diesel fuel.

INDUSTRY APPLICATION OF SULFOLANE EXTRACTION AND DISTILLATION PROCESS AT HUIZHOU REFINERY

Wang Tian-Yu

2010, 41(12): 6-10. doi:

Asbtract ( 1865 )

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The commercial application of sulfolane extraction and distillation (SED) technology developed by Research Institute of Petroleum Processing was successfully carried out on the 780 kt/a PX project of Huizhou Refinery. The performance test and long-term running results showed although the feed compositions were different from the design values in some items, due to the advanced process technology and reasonable process scheme, all the technical indexes met the design targets. The qualities of benzene and toluene reached the requirements of National Standard for super grade products; the recovery rates of benzene and toluene were 99.8% and 99.9%, respectively. The investment, energy consumption and material consumption of SED process were lower than those of the other similar technologies.

AN ANALYSIS OF FACTORS INFLUENCING XYLOL YIELD IN CCR UNIT

2010, 41(12): 11-15. doi:

Asbtract ( 1797 )

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Factors affecting xylol yield in the CCR unit of Qingdao Refining and Chemical Company were analyzed including feedstock components, reaction process and operation. The main causes for the xylol yield lowered than the design value were found and optimization measures based on the current unit status were proposed. Since adopting these measures, the xylol yield increased from the initial 15.0% to 19.3%, and the quality of xylol was improved as well.

EXPERIMENTAL STUDY ON THE DESULFURIZATION OF STRAIGHT-RUN DIESEL BY COMPLEXING EXTRACTION

2010, 41(12): 16-19. doi:

Asbtract ( 1710 )

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The desulfurization of straight-run diesel fuel using a self-made complexing extraction agent (TS-1) was investigated. Under the conditions of an extraction temperature of 20℃, an extraction time of 5 min, a phase separation time of 15 min and a TS-1/diesel volume ratio of 0.02, the sulfur content of treated straight-run diesel A was dropped from 711 μg/g to 245 μg/g, meeting the sulfur content of National Standard for automobile diesel fuel (Ⅲ) (＜350 μg/g), the desulfurization rate was 65.6% and the diesel yield was 99.6%. When the TS-1/diesel volume ratio increased to 0.05, the sulfur content of treated straight-run diesel A was dropped to 42 μg/g, the desulfurization rate was 94.1% and the diesel yield was 99.5%. The removal of sulfide from low sulfur content (374 μg/g) straight-run diesel B and high sulfur content (1 737 μg/g) straight-run diesel C with TS-1 was also studied, and results showed that high desulfurization rate could be obtained under the optimal operation conditions.

PROBLEMS ANALYSIS AND COUNTERMEASURES OF SOUR WATER STRIPPING UNIT

2010, 41(12): 20-23. doi:

Asbtract ( 1988 )

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In order to lower the NH3 content of effluent from stripper and reduce the energy consumption of stripping unit, the effects of inlet feed temperature of stripper on the NH3 content of effluent, as well as the inlet feed temperature of deacidification column on the NH3/H2S content of bottom effluent were analyzed. The main cause of fluctuating NH3 content of effluent was found and measures for optimizing the operations of stripper and deacidification column were proposed. Since adopting these optimization measures, the ammonia content in effluent was reduced significantly and reached less than 30 mg/L; the average consumption of medium pressure steam and low pressure stream was reduced 25.88 and 17.14 units, respectively. The reuse of discharge water in hydrocracking unit increased from 10 m3/h to 16 m3/h, indicating that 6 m3/h effluents were reduced.

CALCULATION OF FOULING IN HIGH-PRESSURE HEAT EXCHANGER OF HYDROGENATION UNIT AND ITS APPLICATION

YAO Li-Song,Hai-tao MU

2010, 41(12): 24-27. doi:

Asbtract ( 1562 )

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The fouling in high-pressure heat exchangers of hydrogenation unit was calculated using MATLAB software, base on the heat balance and film coefficient theory. The calculated results were confirmed to be reliable and were applied to conduct the adding amount of scale inhibitor. With a long-term stable running, the consumption of scale inhibitor was saved 168 t/a, the operation cast of the unit reduced 3.53 MRMB annually.

COMMERCIAL APPLICATION OF CATALYST FOR SUPER REDUCING SULFUR CONTENT OF FCC NAPHTHA

Xiaoli Wei

2010, 41(12): 28-33. doi:

Asbtract ( 1637 )

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In order to further reduce the sulfur content of FCC naphtha, CGP-S catalyst was developed by Research Institute of Petroleum Processing (RIPP). The commercial application of CGP-S catalyst was carried out in the MIP unit of SINOPEC Cangzhou Company. The performance test results showed that the removal of sulfur containing compounds from FCC naphtha could be enhanced significantly by using CGP-S catalyst. When CGP-S catalyst occupied 60% of the total catalyst inventory, the ratio of sulfur content in naphtha to sulfur content in feedstock was decreased 49.23% and 27.43% as compared with that of the base case and CGP-2 case, respectively. CGP-S catalyst also showed good bottoms crackability and product selectivity, furthermore, the quality of naphtha was improved. The selectivity of gasoline increased 2.27 percentage points, MON increased about 1 unit and olefin content in gasoline decreased almost 4 percentage points as compared with the performance test results of CGP-2 catalyst.

PREPARATION AND EVALUATION OF A SELECTIVE HYDRODESULFURIZATION CATALYST FOR FCC GASOLINE

2010, 41(12): 34-37. doi:

Asbtract ( 1798 )

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A deep selective hydrodesulfurization catalyst for FCC gasoline desulfurization was prepared based on modifying conventional Al2O3 carrier. The catalyst possessed improved desulfurization activity and lower olefin saturation activity. Under the conditions of a reaction pressure of 1.5 MPa, a reaction temperature of 230℃, a H2/oil volume ratio of 300 and a LHSV of 2.0 h-1, the desulfuration rate of FCC gasoline reached 93.4%, the total sulfur content of treated gasoline dropped from 439.3 μg/g to 29.1 μg/g and the RON loss was only 0.7 units.

CHARACTERISTICS OF CONDENSING OIL VAPOR RECOVERY AND STRUCTURE ANALYSIS OF HEAT EXCHANGERS

Li Cheng

2010, 41(12): 38-44. doi:

Asbtract ( 1972 )

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Based on the refrigerating characteristics of condensing oil vapor recovery system, the hydrocarbons recovery principles and the condensation efficiency were discussed by numerically analyzing the condensation curves of three various oil vapor-air mixtures. Results showed that the oil vapor recovery rate was mainly depended on the mixture compositions. Therefore, the design of condensing oil vapor recovery equipment should base on the characteristics of oil-gas mixtures. The latent loads from the condensation of oil-gas mixture were cooling loads mainly, in which the cooling loads of the shallow cooling stage and the deep cooling stage were relatively heavy. Structure characteristics of fin-tube heat exchangers for condensing oil vapor recovery were discussed based on the calculated data of cooling loads.

MEASUREMENT AND CORRELATION OF ISOTHERMAL VAPOR-LIQUID EQUILIBRIUM DATA FOR ISOPRENE/n-HEXANE BINARY SYSTEM

2010, 41(12): 45-47. doi:

Asbtract ( 1610 )

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The isothermal vapor-liquid equilibrium data of the binary system for isoprene/n-hexane at 30℃, 40℃ and 50℃ were measured using a vapor liquid-recycled equilibrium still. The experimental data were confirmed by thermodynamic consistency tests using Herington method. Then the data were correlated by Wilson equation and model parameters were obtained. Results show that the average relative deviations between calculated values and experimental data of vapor phase mole fractions are all less than 0. 33%.

STUDY ON THE PREPARATION AND PROPERTIES OF A NEW COMPLEX ANTIOXIDANT

2010, 41(12): 48-51. doi:

Asbtract ( 1867 )

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A sulfide-containing easter lubricant additive was synthesized by amine, carbon bisulfide etc., and a new complex antioxidant was developed by incorporating hindered phenol and aromatic amine antioxidants into it. The tribological and anti-oxidation performance of said complex antioxidant in hydrogenated lube base stock and gasoline engine oil were evaluated by rotary bomb oxidation test (RBOT), pressurized differential scanning calorimeter (PDSC) and wear tester. Results showed that said complex antioxidant exhibited excellent anti-oxidation performance, positive synergistic effect with other additives and certain extreme pressure properties. Furthermore, this complex antioxidant was helpful to improve the anti-oxidation property of MoDTC for keeping product having good friction reducing properties even after oxidation.

PREPARATION OF BIODIESEL FROM WASTE EDIBLE OIL WITH HIGH ANIMAL OIL CONTENT USING ALKALI HOMOGENEOUS CATALYST

2010, 41(12): 52-55. doi:

Asbtract ( 1827 )

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The optimal process conditions for producing biodiesel from waste edible oil having high animal oil content using NaOH homogeneous catalyst were obtained as follows: the weight ratio of methanol to waste edible oil was 25%，the catalyst amount was l.0％，the reaction temperature was 60℃，the reaction time was 60 min and the stirring speed was 3 000 r/min. A scale up test was carried out under such conditions and the results showed that the yield of biodiesel was 93.6%, some of the physicochemical properties of this product reached the requirements of National Standard for Biodiesel Fuel. The low temperature fluidity of this obtained biodiesel could be improved by blending conventional 0# diesel fuel.

STUDY ON THE BIOLOGICAL TREATMENT OF OILFIELD WASTE DRILLING FLUID

2010, 41(12): 56-60. doi:

Asbtract ( 1825 )

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The organic contaminations in the waste drilling fluid from Pinghu Oilfield was investigated by GC/MS and the results showed that 23 kinds of organic pollutants including hydrocarbons, acids and esters existed in the waste drilling fluid. A bacterial 16S rRNA gene clone library was constructed to detect the community diversity in the waste drilling fluid. The phylogenetic analysis indicated that most of the clones were clustered in β, γ-Proteobacteria with the phylotypes belong to γ-Proteobacteria accounting for 78.6% of the clone library. A type of bacteria identified as Serratia marcescens was isolated from the waste drilling fluid, which had positive effect on the degradation of pollutants in the waste drilling fluid, and the removal rates of COD and TOC were more than 50%.

AN ANALYSIS OF ENERGY CONSUMPTION IN A FCC UNIT PROCESSING HEAVY FEEDSTOCK

2010, 41(12): 61-64. doi:

Asbtract ( 2034 )

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By comparing the energy consumption of a FCC unit processing heavy feed prior and post to revamping with MIP technology, it can be seen that the energy consumption post to revamping is declined due to the decrease of required reaction heat and the increase of steam output. The energy balance and exergy balance are computed and analyzed using three-link model which including energy exchange and transmission link, technology utilization link and energy recovery link. Results show that in the energy recovery link of the unit, potential energy saving space still could be found, such as improving the energy utilization of regenerator and flue gas turbine. Some suggestions for further energy conservation of the unit are discussed and proposed.

MEASURES FOR THE UTILIZATION OF LOW TEMPERATURE HEAT FROM REFINING UNITS AND ANALYSIS OF POTENTIAL ENERGY SAVING

2010, 41(12): 65-70. doi:

Asbtract ( 1637 )

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The present status of three low-temperature heat recovery systems in SINOPEC Shijiazhuang Company, FCC unit plus No.2 gas separation unit, delayed coking unit and No.1 complex unit plus crude tank farm, was introduced and some optimization measures based on the “temperature counterpart and gradient utilization” principle were proposed. Besides, the status of unrecovered low-temperature heat sources and heat sinks in units, the measures for potential energy saving were analyzed.

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