Showing papers in "Science & Technology in Chemical Industry in 2004"

Advances in desulfurization of FCC gasoline

Abstract: With the gradual strictness of the environmental laws,the requirement for the quality of gasoline is getting higherIt has resulted in a continuing world wide effort to reduce sulfur levels in gasolineThe reducing of gasoline sulfur is considered to be an effective means for improving air qualityThe desulfurization technology has become a key technology in various oil refinery enterprisesSulfur compounds in gasoline come mainly from FCC(Fluid Catalytic Cracking),so research and development of FCC gasoline desulfurization technology are very importantAt present,technologies of reducing sulfur content of FCC gasoline include FCC raw oil hydrodesulfurization,FCC gasoline hydrodesulfurization,solvent extraction desulfurization,catalytic cracking desulfurization,oxidative desulfurization,biodesulfurization,and adsorption desulfurizationThe paper reviews advances in FCC gasoline desulfurization technologies at home and abroad

Application of R/S analysis to flow pattern identification for gas-solid spouted beds

Abstract: A method,based on the fractal analysis,was proposed for the prediction of variations of flow regimes in a rectangular spouted bed of 200?mm×15?mm×600?mm.Three types of particle systems with different diameter or density were used as solid phase.It is found that the fixed bed,stable spouting and unstable spouting flow pattern can be clearly identified in the bed under different gas flow velocities and different solid particles,according to the characteristics of logE[R(t,τ)/S(t,τ)] vs logτ curves corresponding pressure fluctuations signals.

Studies on gas pressure drop characteristics of cross-flow rotating packed bed

Abstract: The gas pressure drop of a rotating packed bed (RPB) is an important factor in its engineering design. In this paper, the gas pressure drop of a cross-flow rotating packed bed is studied based on air-water system. In the range of experiments, results show that the cross-flow pressure drop is tenth of counter-flow and is influenced by rotating speed and gas flow rate. It is almost independent of liquid flow rate.

Process optimizing for wastewater treatment system in ABS unit

Abstract: This paper introduces how Jihua Synthetic Resin Factory gets the wastewater in ABS unit to reach the COD discharge standard by the method of point source treating and process optimizing.

Catalyst derived from HTLcs for one-step synthesis of methyl isobutyl ketone from acetone

Abstract: Cu-Mg-A1 hydrotalcite-like compounds were prepared by coprecipitation,and then CuO-MgO-Al_2O_3 catalyst for one-step synthesis of methyl isobutyl ketone from acetone and hydrogen at atmospheric pressure were obtained by calcining Cu-Mg-A1 hydrotalcite-like compounds.The influence of catalyst composition and reaction condition on the conversion of acetone and selectivity of MIBK was investigated.It was found that the best catalyst composition was n(Cu)∶n(Mg)∶n(Al)=4∶16∶10 and the conversion of acetone was 73.88%and that the selectivity of MIBK was 55.23% at the optimum reaction conditions of temperature 240?℃,H_2/acetone molar ratio 2.5 and liquid space velocity 4.8?mL acetone/h·g.

Study on extraction and separation of rare earth metal ions by calix[8]arene

Abstract: The calix[8]arene was synthesized and the extraction of rare earth metal ions Nd~(3+),Eu~(3+),Pr~(3+) in solution with calix[8]arene was studiedThe extraction equilibrium constants of Nd~(3+),Eu~(3+),Pr~(3+) on the condition of temperature 25℃ and ion strength I=01g/mol,were determinedThe factors of extraction for these three rare earth metal ions and extraction mechanism as well as rule were discussed

Progress of extraction of L-arginine from cystine mother liquor

Abstract: The extractive technology of L-arginine from cystine mother liquor is reviewed in this paper.Special deposition,electrodialysis and ion exchange methods are introduced.

Separation of mixtures of 3-methylpyridine with 4- methylpyridine

Abstract: 3-Methylpyridine and 4-methylpyridine are useful products of considerable commercial interestThey are used as intermediates in the preparation of pesticide,pharmaceutical products,dyes and the likeVarious processess for separating 3-methylpyridine and 4- methylpyridine are reviewed in this paperAnd the developing trend is also discussed

Study on distillation in a rotating packed bed

Abstract: The mass-transfer efficiency of a new vapor-liquid contactor-Rotating Packed Bed(RPB) was studiedDistillation experiment was doing with the ethanol-watersystem,in RPB that contained a rotor,with an outside diameter of 180mm,an inside diameter of 60mm,axial depth of 40mmThe result showed that the mass-transfer efficiency of RPB increased correspond to the F and β in low rotating speedThe height of mass-transfer unit(HTU) was (109)～176cm and its mass transfer model was developed

Application of efficiency and effectiveness on surfactants flooding system

Abstract: The connotation of efficiency and effectiveness was redefined and the definitions were used to describe the characterics of the flooding surfactants in reducing oil/water interfacial tension.The testing and calculating results show that efficiency and effectiveness can be treated as two gauges to evaluate and choose flooding surfactants.And the length and branching of alkyl chain in the hydrophobic group are main structure factors affecting surfactants' efficiency and effectiveness.

Synthesis of benzyl cinnamate by phase transfer catalysis method

Abstract: Benzyl cinnamate has been synthesized with hexadecy trimethylammonium bromide as the catalyst.The factors influencing on the yield of the reaction,such as the amount of catalyst,reaction temperature,reaction time and molar ratio of sodium cinnamate to benzyl chloride,are investigated.The result shows that hexadecy trimethylammonium bromide is an effective catalyst and the optimum conditions of preparation are determined with yield of benzyl cinnamate 96.3%.The conditions are as follows:molar ratio of sodium cinnamate to benzyl chloride is 1∶1.3,amount of the catalyst is 0.6 grams,reaction temperature is 95℃ and reaction time is 3.0 hours.The structure is characterized by IR,~1H NMR and MS.