Journal of The Chinese Institute of Chemical Engineers最新文献_第4页

Enzymatic synthesis of caffeic acid phenethyl ester 咖啡酸苯乙酯的酶法合成

Journal of The Chinese Institute of Chemical Engineers Pub Date : 2008-09-01 DOI: 10.1016/j.jcice.2008.05.003

Arief Widjaja , Tze-Haw Yeh , Yi-Hsu Ju

{"title":"Enzymatic synthesis of caffeic acid phenethyl ester","authors":"Arief Widjaja , Tze-Haw Yeh , Yi-Hsu Ju","doi":"10.1016/j.jcice.2008.05.003","DOIUrl":"10.1016/j.jcice.2008.05.003","url":null,"abstract":"<div>Caffeic acid phenethyl ester was successfully synthesized from caffeic acid and phenethyl alcohol catalyzed by Novozym 435. Caffeic acid was found to yield much higher conversion in non-polar solvents than in polar ones, albeit its low solubility in non-polar solvents. Among all solvents tested, isooctane gave the highest conversion and was chosen as the solvent in this study. A reaction temperature of 70°C was chosen to give high solubility of caffeic acid and hence high conversion. The optimum molar ratio of acid to alcohol was found to be 1:92. More alcohol resulted in the inactivation of enzyme. An acid to enzyme ratio of 1:15 (w/w) gave nearly a 100% conversion in 48h. The conversion was found to be independent of stirring speed. Low stirrer speed of 50rpm was enough and necessary to provide good mixing. Results from batch reuse stability study show that Novozym 435 could maintain more than 90% of its original activity up to the third batch. The enzyme lost its activity faster under higher stirring speed. Reactions carried out without stirring gave better enzyme batch stability, however, the conversions were always less than 90%.</div>","PeriodicalId":17285,"journal":{"name":"Journal of The Chinese Institute of Chemical Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jcice.2008.05.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81019046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 53

Hydrogen production from oxidative steam reforming of ethanol in a palladium–silver alloy composite membrane reactor 钯银合金复合膜反应器中乙醇氧化蒸汽重整制氢

Journal of The Chinese Institute of Chemical Engineers Pub Date : 2008-09-01 DOI: 10.1016/j.jcice.2008.02.008

Wen-Hsiung Lin , Ying-Chi Liu , Hsin-Fu Chang

{"title":"Hydrogen production from oxidative steam reforming of ethanol in a palladium–silver alloy composite membrane reactor","authors":"Wen-Hsiung Lin , Ying-Chi Liu , Hsin-Fu Chang","doi":"10.1016/j.jcice.2008.02.008","DOIUrl":"10.1016/j.jcice.2008.02.008","url":null,"abstract":"<div>In this investigation, we studied the oxidative steam reforming reaction of ethanol in a Pd–Ag/PSS membrane reactor for the production of high purity hydrogen. Palladium and silver were deposited on porous stainless steel (PSS) tube via the sequential electroless plating procedure with an overall film thickness of 20μm and Pd/Ag weight ratio of 78/22. An ethanol–water mixture (nwater/nethanol  =0.2, 0.7 or 1.0) were fed concurrently into the membrane reactor packed with Zn–Cu commercial catalyst (MDC-3). The reaction temperatures were set at 593–723K and the pressures at 3–10atm. The hydrogen flux in the permeation side increased proportionately with increasing pressure; however, it reduced slightly when increasing oxygen input. This is probably due to the fast oxidation reaction that consumes hydrogen before the onset of the steam reforming reaction. The effect of oxygen plays a vital role on the ethanol oxidation steam reforming reaction, especially for a Pd–Ag membrane reactor in which a higher flux of hydrogen is required. The selectivity of CO2 increased with increasing flow rate of oxygen, while the selectivity of CO remained almost the same.</div>","PeriodicalId":17285,"journal":{"name":"Journal of The Chinese Institute of Chemical Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jcice.2008.02.008","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89072289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 22

Enhancing equation comprehension with index finger writing: An fMRI study 用食指书写提高方程式理解能力:一项功能磁共振成像研究

Journal of The Chinese Institute of Chemical Engineers Pub Date : 2008-09-01 DOI: 10.1016/j.jcice.2008.03.011

Xiao-Dong Wang , Ming-Tung Wang , Duu-Jong Lee

引用次数: 2

Kinetic analysis of the hydrogen oxidation reaction at Nafion film covered Pt-black rotating disk electrodes Pt-black旋转圆盘电极上的氢氧化反应动力学分析

Journal of The Chinese Institute of Chemical Engineers Pub Date : 2008-09-01 DOI: 10.1016/j.jcice.2008.05.006

Ren-Bin Lin , Shin-Min Shih

引用次数: 10

Biodegradation of diesel-contaminated soil: A soil column study 柴油污染土壤的生物降解:土壤柱的研究

Journal of The Chinese Institute of Chemical Engineers Pub Date : 2008-09-01 DOI: 10.1016/j.jcice.2008.03.006

Pao-Wen Grace Liu , Liang-Ming Whang , Ming-Chieh Yang , Sheng-Shung Cheng

引用次数: 40

Carbothermic reduction of zinc sulfide in the presence of sodium carbonate 碳酸钠存在下硫化锌的碳热还原

Journal of The Chinese Institute of Chemical Engineers Pub Date : 2008-09-01 DOI: 10.1016/j.jcice.2008.03.004

Hsiang-Yu Chuang , Chun-I Lin , Hsi-Kuei Chen

{"title":"Carbothermic reduction of zinc sulfide in the presence of sodium carbonate","authors":"Hsiang-Yu Chuang , Chun-I Lin , Hsi-Kuei Chen","doi":"10.1016/j.jcice.2008.03.004","DOIUrl":"10.1016/j.jcice.2008.03.004","url":null,"abstract":"<div>The carbothermic reduction of zinc sulfide in the presence of sodium carbonate has been studied using X-ray diffractometry (XRD), thermogravimetric analysis system (TGA), atomic absorption spectrometry (AAS), inductively coupled plasma-mass spectrometry (ICP-MS), elemental analyzer (EA) and scanning electron microscopy (SEM). Experimental results of AAS indicated that the reduction in the presence of sodium carbonate proceeded significantly faster than in the presence of calcium carbonate and its sulfur fixation efficiency was acceptable. The results of XRD revealed that zinc sulfide was first transformed from β-type to α-type, then reduced to zinc vapor. The sequence of the variation of sodium containing material was found to be <figure><img></figure>. A reaction mechanism is proposed to interpret the overall reaction. Results of kinetic study indicated that the rate of reduction could be increased by increasing the reaction temperature, the initial molar ratio of C/ZnS, or the initial molar ratio of Na2CO3/ZnS. The rate was also found to be increased with a decrease in sample height, size of C aggregate, size of Na2CO3 aggregate or the initial bulk density. The reduction rate, however, was found not to be influenced by the argon flow rate. An empirical expression of the initial rate of zinc yield has been determined.</div>","PeriodicalId":17285,"journal":{"name":"Journal of The Chinese Institute of Chemical Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jcice.2008.03.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82894705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Graph-theoretic and energetic exploration of catalytic pathways of the water-gas shift reaction 水气转换反应催化途径的图论与能量探索

Journal of The Chinese Institute of Chemical Engineers Pub Date : 2008-09-01 DOI: 10.1016/j.jcice.2008.04.004

L.T. Fan , Yu-Chuan Lin , Shahram Shafie , Keith L. Hohn , Botond Bertók , Ferenc Friedler

引用次数: 13

Shortcut design of complex distillation 复杂蒸馏的快捷设计

Journal of The Chinese Institute of Chemical Engineers Pub Date : 2008-09-01 DOI: 10.1016/j.jcice.2008.04.001

En-Ko Lee , David Shan-Hill Wong

引用次数: 1

Polymerization kinetics for the preparation of poly(p-divinylbenzene) via a miniemulsion polymerization process 微乳液聚合法制备聚对二乙烯基苯的聚合动力学研究

Journal of The Chinese Institute of Chemical Engineers Pub Date : 2008-09-01 DOI: 10.1016/j.jcice.2008.05.002

Eun Cheol Choi , Seon Mi Jin , Ye Ji Park , Yangsoo Kim

引用次数: 4

Performance of the polymer- and oxide-supported triphase catalysts and effect of ultrasound on their stabilities 聚合物和氧化物负载三相催化剂的性能及超声对其稳定性的影响

Journal of The Chinese Institute of Chemical Engineers Pub Date : 2008-09-01 DOI: 10.1016/j.jcice.2008.02.002

Hsieh-Ting Chung , Hsu-Chin Hsiao , Hung-Shan Weng

{"title":"Performance of the polymer- and oxide-supported triphase catalysts and effect of ultrasound on their stabilities","authors":"Hsieh-Ting Chung , Hsu-Chin Hsiao , Hung-Shan Weng","doi":"10.1016/j.jcice.2008.02.002","DOIUrl":"10.1016/j.jcice.2008.02.002","url":null,"abstract":"<div>In this study, several trialkylamines were immobilized on chloromethylated polystyrene (CMPS), silica gel, and alumina to prepare triphase catalysts for catalyzing the etherification reaction of allyl bromide (the organic reactant) and sodium phenolate (the aqueous reactant). The reactor was agitated mechanically or with the aid of ultrasonic vibration. Performances of the prepared catalysts were compared, and the effect of imposing ultrasound was investigated based on the activity, selectivity, and stability of the catalyst. Experimental results show that tri-n-propylamine is the best active species when CMPS is used as the support, while tri-n-butylamine is the best when SiO2 and Al2O3 are employed as the supports. The CMPS-supported catalyst is far better than the SiO2- and Al2O3-supported catalysts in activity and selectivity but not in stability. Imposing the ultrasound can effectively increase the reaction rate. Mechanical agitation at a low speed with the imposition of ultrasonic vibration not only results in a conversion slightly higher than the case with a high mechanical agitation speed without ultrasonic vibration, but also gives a constant stability for the CMPS-supported catalyst.</div>","PeriodicalId":17285,"journal":{"name":"Journal of The Chinese Institute of Chemical Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jcice.2008.02.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77176281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2