Process For Production Of Aliphatic Esters

碩士 === 國立中正大學 === 化學工程研究所 === 88 === Abstract The commercial production of ethyl acetate is mainly by two processes: the Tischenko reaction which produces ethyl acetate by direct conversion of ethanol via acetaldehyde using aluminum alkoxide catalyst; and the production of ethyl aceta...

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Main Authors: Fu-Sheng Tzeng, 曾福勝
Other Authors: Jen-Ray Chang
Format: Others
Language:zh-TW
Published: 2000
Online Access:http://ndltd.ncl.edu.tw/handle/63134375922938014552
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spelling ndltd-TW-088CCU000630102015-10-13T11:50:27Z http://ndltd.ncl.edu.tw/handle/63134375922938014552 Process For Production Of Aliphatic Esters 脂肪酯類製程之開發 Fu-Sheng Tzeng 曾福勝 碩士 國立中正大學 化學工程研究所 88 Abstract The commercial production of ethyl acetate is mainly by two processes: the Tischenko reaction which produces ethyl acetate by direct conversion of ethanol via acetaldehyde using aluminum alkoxide catalyst; and the production of ethyl acetate by direct esterification of ethanol with acetic acid using a sulfuric acid catalyst. Since both process have wasted-catalyst-treatment problem and have to suffer high cost of raw material, it motivates us to develop a process for the conversion of water-containing ethanol to ethyl acetate. By Pd/SDB (styrene divinylbenzene copolymer) catalyst developed before, the process includes two stages operated in a fix-bed reactor. The first stage is the catalytic oxidation of ethanol to acetic with air over the Pd catalyst and the second stage is the esterification of acetic acid with ethanol over Amberlyst-15 catalysts. In this study, we found that Pd(II)-acetate formed from the reaction of the reaction immediate, acetic acid, with Pd clusters on the catalysts results in a leaching and aggregating of Pd clusters thereby decreasing the catalyst activity. To remedy the drawbacks of the catalysts, zeolite-supported bimetallic catalysts have been developed. By controlling the properties of supports including pore size, acidity, and polarity, the goals of high esterification selectivity, stability maintenance, and low impurity have been achieved. The experimental results indicated that catalyzed by Pd-X(Pt, Ag, Ni, Ru, Zn)/Zeolite catalysts, about 62.5% ethanol was converted and the selectivity to ethyl acetate selectivity was up to 93.3%. Moreover, since the catalysts can be regenerated under very mild conditions, they are regarded to be promising for industrial application. Jen-Ray Chang 張仁瑞 2000 學位論文 ; thesis 0 zh-TW
collection NDLTD
language zh-TW
format Others
sources NDLTD
description 碩士 === 國立中正大學 === 化學工程研究所 === 88 === Abstract The commercial production of ethyl acetate is mainly by two processes: the Tischenko reaction which produces ethyl acetate by direct conversion of ethanol via acetaldehyde using aluminum alkoxide catalyst; and the production of ethyl acetate by direct esterification of ethanol with acetic acid using a sulfuric acid catalyst. Since both process have wasted-catalyst-treatment problem and have to suffer high cost of raw material, it motivates us to develop a process for the conversion of water-containing ethanol to ethyl acetate. By Pd/SDB (styrene divinylbenzene copolymer) catalyst developed before, the process includes two stages operated in a fix-bed reactor. The first stage is the catalytic oxidation of ethanol to acetic with air over the Pd catalyst and the second stage is the esterification of acetic acid with ethanol over Amberlyst-15 catalysts. In this study, we found that Pd(II)-acetate formed from the reaction of the reaction immediate, acetic acid, with Pd clusters on the catalysts results in a leaching and aggregating of Pd clusters thereby decreasing the catalyst activity. To remedy the drawbacks of the catalysts, zeolite-supported bimetallic catalysts have been developed. By controlling the properties of supports including pore size, acidity, and polarity, the goals of high esterification selectivity, stability maintenance, and low impurity have been achieved. The experimental results indicated that catalyzed by Pd-X(Pt, Ag, Ni, Ru, Zn)/Zeolite catalysts, about 62.5% ethanol was converted and the selectivity to ethyl acetate selectivity was up to 93.3%. Moreover, since the catalysts can be regenerated under very mild conditions, they are regarded to be promising for industrial application.
author2 Jen-Ray Chang
author_facet Jen-Ray Chang
Fu-Sheng Tzeng
曾福勝
author Fu-Sheng Tzeng
曾福勝
spellingShingle Fu-Sheng Tzeng
曾福勝
Process For Production Of Aliphatic Esters
author_sort Fu-Sheng Tzeng
title Process For Production Of Aliphatic Esters
title_short Process For Production Of Aliphatic Esters
title_full Process For Production Of Aliphatic Esters
title_fullStr Process For Production Of Aliphatic Esters
title_full_unstemmed Process For Production Of Aliphatic Esters
title_sort process for production of aliphatic esters
publishDate 2000
url http://ndltd.ncl.edu.tw/handle/63134375922938014552
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