Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters
Reexamination Certificate
2007-03-08
2008-07-15
Puttlitz, Karl (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid esters
Reexamination Certificate
active
07399881
ABSTRACT:
A transesterification process of methyl acetate is provided. The process comprises: (a) performing a first reactive distillation of a methyl acetate solution and a first alcohol to generate a first ester and a first mixture; (b) performing a first distillation of a first part of the first mixture to generate a second mixture; and (c) performing a second reactive distillation of a first part of the second mixture and a second alcohol to generate a second ester; wherein the respective one of the first and second alcohols is a limiting reagent. The transesterification process provided in the present invention could highly reduce the investing production cost of the transesterification of the by-product, methyl acetate, in the conventional polyvinyl alcohol plants.
REFERENCES:
patent: 4927954 (1990-05-01), Knopf et al.
Luyben, William L. et al., “Design and Control of Conventional and Reactive Distillation Processes for the Production of Butyl Acetate,”Ind. Eng. Chem. Res.2004, 43, 8014-8025.
Steinigeweg, Sven and Jurgen Gmehling, “Transesterification Processes by Combination of Reactive Distillation and Pervaporation,”Chemical Engineering and Processing, 43 (2004) 447-456.
Chen Jyun-Hong
Cheng Jian-Kai
Huang Hsiao-Ping
Lee Ming-Jer
Yu Cheng-Ching
National Taiwan University
Puttlitz Karl
Volpe and Koenig P.C.
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