Table of Content

12 September 2007, Volume 38 Issue 9

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基础研究

STUDY ON THE BIMOLECULAR CATALYTIC CRACKING REACTION AND ITS RATIO TO THE BIMOLECULAR HYDROGEN TRANSFER REACTION

2007, 38(9):  1-5.  doi:

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The catalytic conversion experiments were processed using FCC naphtha as feed over various catalysts. The bimolecular cracking reactions of olefins were studied and the effect of ratios of bimolecular cracking reactions to hydrogen transfer reactions on the yields of LPG and gasoline were discussed. The results show that under the testing conditions the proceeding of olefins cracking and the ratios of cracking to hydrogen transfer are varied over various catalysts. Comparisons between regenerated catalyst and spent catalyst show that under relatively high reaction temperature and high WHSV, cracking reactions are favored to enhance LPG yield for the former, and under relatively low reaction temperature and low WHSV, hydrogen transfer reactions are favored to increase gasoline yield for the latter. By proper adjusting the ratios of bimolecular cracking reactions to hydrogen transfer reactions, the product slates of FCC process could be more flexible and various.

Study of methanol to olefins on several catalysts

2007, 38(9):  13-17.  doi:

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The process of methanol to olefins on four kinds of FCC industrial equilibrium agents, LOSA-1 assistant and SAPO-34 was studied using the pulse microreacter-chromatography devices in the experiment. The results indicated: the hydrocarbon and light olefins yields of methanol conversion were 19.91% and 11.41% on GOR-Ⅱ, 21.90% and 16.52% on SAPO-34, 26.73% and 12.01% on LOSA-1. The hydrocarbon and light olefins yields reached a maximum value 27.52% and 15.72% when LOSA-1 was added into GOR-Ⅱat the ratio of 5%. The hydrocarbon and light olefins yields of 40% methanol solution were 9.09% and 6.20% on GOR-Ⅱ, 24.71% and 20.08% on SAPO-34. But the hydrocarbon and light olefins yields of methanol conversion were low on CHZ-4, DACS-GQ1 and RAG-10 and they can reach 11.12% and 6.04% in the case of increasing the amount of RAG-10.The experiment showed that the hydrocarbon and light olefins yields of methanol conversion were higher on GOR-Ⅱthan on other three kinds of FCC industrial equilibrium agents, the hydrocarbon and the light olefins yields of methanol increased when the LOSA-1 was added into GOR-Ⅱ.Therefore, preliminary reference was provided for the research of the reaction regularity of methanol to olefins on FCC catalysts.

Studies on Prediction of Hydrocarbon Types Composition of VGO Based on Normal Physical Characteristics

2007, 38(9):  18-22.  doi:

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Using 5 normal physical characteristics of the VGO included density、refractive index、molecular weight、the content of sulfur and hydrogen predicte the 13 hydrocarbon types compositions,thinking about the interaction of the 5 factors,Obtained satisfied prediction model using stepwise regression.

加工工艺

Commercial application trial of RAX-2000A p-xylene adsorbent

2007, 38(9):  23-27.  doi:

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Commercial application trial of RAX-2000A adsorbent was carried out at Parex unit of Qilu petrochemical Corp. The calibration results were reported: p-xylene purity 99.77% and 99.81%，recovery 99.05% and 98.56% was achieved at 102.9% and 111.4% unit design charge rate. The unit was operated smoothly more than two years and long term operation is possible. Low bed pressure drop and adaptability of different feed were represent.

STUDY AND COMMERCIAL APPLICATION OF PRODUCING GASOLINE WITH SULFUR CONTENT UNDER 50µg/g BY OCT-M PROCESS

2007, 38(9):  28-31.  doi:

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The different properties of MIP gasoline and conventional FCC gasoline were studied. The octane loss of products (with sulfur level under 50µg/g) by OCT-M selective HDS process of MIP gasoline and conventional FCC gasoline were investigated. The OCT-M process commercial application evaluated results showed that the sulfur content of MIP gasoline was lowered from the original 417―442µg/g to 24―53µg/g and RON loss was only 0.7―1.8 unit . OCT-M process provides flexible and economic technological options for production of clean gasoline with sulfur level under 50µg/g from MIP gasoline in refineries.

催化剂

Effect of solvent on the preparation of LaMnFe2Al9O19 catalysts by sol-gel method

Ren Xiaoguang

2007, 38(9):  38-41.  doi:

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Abstract: Hexxaaluminate LaMnFe2Al9O19 was prepared by the sol -gel method. During the process the ethanol, isopropanol and n-butanol were used as solvent respectively. The chemical and physical properties of catalysts affected by different solvent were investigated by means of XRD, BET and XPS techniques. The results showed that the catalyst LaMnFe2Al9O19 with good crystallinity was obtained after calcination under oxygen at 1200℃. The catalyst obtained from the isopropanol which was used as solvent exhibited higher catalytic activity in methane combustion.

reparation and characterization of solid superacid SO42-/TiO2-SnO2

2007, 38(9):  42-46.  doi:

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Solid superacid catalyst SO42-/TiO2-SnO2 was prepared by sol-gel method； The catalytic performance was evaluated by the esterification of acetic acid and n-butanol and the influences of preparation parameters on its catalytic properties were studied. These catalysts were characterized by IR, XRD and TG-DTA. The optimum preparation conditions for the catalyst SO42-/TiO2-SnO2 was: the mole ratio of titanium and tin 3∶1, impregnated with 2.0mol/L H2SO4, calcinated at 500℃ for 3 h。

Studies on Preparation and Performance of O-benzene salicylaldiminato Titanium Catalyst

Shuai TIAN SANXI Li

2007, 38(9):  47-51.  doi:

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油品与添加剂

STUDY ON MODIFIED ASPHALT FORM LANLIAN WITH PPA/SBR

2007, 38(9):  52-56.  doi:

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The optimized blend condition of PPA and SBR in asphalt and the technics of making such a asphalt was studied . The effects of plasticizer and crosslinking agent ,the technics of making asphalt were investigatated respectively .Results showed the addition of plasticizer in asphalt can improve the aging resistance but caused negative effects on toughness and tenacity, the use of crosslinking agent can improve the toughenss and tenacity of asphalt however reduce its low-temperature ductility ,Wth the increase of SBR`s dose in asphalt , low-temperature ductility of asphalt can be improved greatly by adopting suitable technics.

Synthesis of Novel Cetane Number ImproverMethyl 4,4-dinitropentanoate by Phase Transfer Catalysis

2007, 38(9):  57-61.  doi:

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The methyl 4, 4-dinitropentanoate has been synthesized by the Michael addition of potassium dinitroethane with methyl acrylate in the presence of tetrabutyl ammonium chloride as phase-transfer catalyst (PTC) and the compound could be used as cetane number improver in diesel fuels. The IR and GC/MS were used to identify the structure of the compound, and some factors to influence the yield were studied. Several PTCs were investigated, but only tetrabutyl ammonium chloride did the preferable yields. The addition product (methyl 4,4-dinitropentanoate) was obtained at 25~45℃ for about 0.5 hours and the ratio of potassium dinitroethane to methyl acrylate in 1:3(mol) and the ratio of water to potassium dinitroethane in 20:1, and the yield could be reached to 80%, while the tetrabutyl ammonium chloride was 0.25%~0.5% (based on potassium dinitroethane).

Performances and application of Polyisobutene Amine

2007, 38(9):  62-64.  doi:

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The polyisobutene amine was synthesized by taking polyisobutene and diethylenetriamine as raw material. The results show that polyisobutene amine has good cleaning effect. And the product can be used in gasoline detergent which could meet the specification of GB 19592-2004.

设备

PRELIMINARY STUDY OF THE REMOVAL OF RESIDUAL CATALYST PARTICLES IN FCC SLURRY WITH MINI HYDRO-CYCLONE

2007, 38(9):  65-68.  doi:

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The removal of residual catalyst particles in FCC slurry by a mini hydro-cyclone (with a diameter of 10 mm) was studied using water as liquid phase medium and the experiments were carried out at room temperature. The test results showed that under a solid content in feed of less than 2% and an average particle diameter of 16 μm, the revised total separation efficiency reached 96.6%~97.5%; d50’ was 3.1μm, d50 was less than 2μm, the solid content in top flow was 0.018% with an average particle diameter of 5.6 μm; if a second stage hydro-cyclone was applied, the solid content in top flow could be further reduced to 67 μg/g. Since the actual residual catalyst particles in FCC slurry were somewhat bigger than that of the testing powder, it should be technically feasible to remove them by mini hydro-cyclone with a diameter of 10 mm.