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Transesterification process of methyl acetate

a technology of methyl acetate and esterification process, which is applied in the preparation of ester-hydroxy reactions, chemical apparatus and processes, and organic chemistry, etc., can solve the problems of reducing methyl acetate is a less valuable solvent, and the overall economic efficiency of the conventional polyvinyl alcohol plant is reduced. , to achieve the effect of economic and efficient operation

Active Publication Date: 2008-07-03
NAT TAIWAN UNIV
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Benefits of technology

[0011]In consideration of a transesterification process of methyl acetate working in the polyvinyl alcohol plan

Problems solved by technology

Methyl acetate is a less valuable solvent due to its low industrial application and low volatility, even if the amount of the produced methyl acetate is one-half times higher than that of polyvinyl alcohol.
Though the transerterification process of methyl acetate proposed by Luyben et al overcomes the co-boiling phenomenon of n-butyl ester and butyl acetate by means of the distillation tower of high pressure, the consumption of the steam amount of the distillation tower of high pressure brings about the considerable investing production cost to the conventional polyvinyl alcohol plants.
Though the transesterification process proposed by Steinigeweg et al overcomes the co-boiling phenomenon of methyl acetate and methanol by means of the pervaporation device, the regular placement of the film in the pervaporation device also lowers down the overall economic efficiency of the conventional polyvinyl alcohol plants.
From the above description, it is known that how to develop an efficient and economical transesterification process of methyl acetate has become a major problem to be solved.

Method used

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  • Transesterification process of methyl acetate
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embodiments

[0053]

ItemsEmbodiment IEmbodiment IIMol. Composition of methyl60% methyl60% methylacetate solutionacetate +acetate + 40%40% methanolmethanolMol. Composition of100% n-butanol100% n-butanoln-butanol solutionThe reactive distillation device (1)No. of the reactive trays3548No. of the rectifying trays 5 5No. of the stripping trays 8 7No. of trays that n-butanol43th55thfeedsNo. of trays that methylX12thacetate feedsNo. of trays that a zeotrope feeds12th12thThe distillation device (8)No. of total trays1419No. of trays that methyl12thXacetate feedsNo. of trays that reflux feeds5th8thThe amount of reflux112.45 (kmol / hr)109.64 (kmol / hr)The purity of butyl acetate99 mol %99 mol %The purity of methanol99 mol %99 mol %

[0054]In the Embodiment I, the methyl acetate solution is fed to the distillation device (8); in the embodiment II, the methyl acetate solution is fed to the reactive distillation device (1).

[0055]In conclusion, although the reactive distillation system depends upon the plurality o...

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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.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a transesterification process, and more particularly to a transesterification process of methyl acetate.BACKGROUND OF THE INVENTION[0002]Polyvinyl alcohol is a kind of polymer widely used in the chemical industry; however, the manufacturing process of polyvinyl alcohol is always accompanying with the abundant production of the by-product, methyl acetate. Methyl acetate is a less valuable solvent due to its low industrial application and low volatility, even if the amount of the produced methyl acetate is one-half times higher than that of polyvinyl alcohol. Accordingly, the impure methyl acetate is usually discharged into the atmosphere after scrubbing in a wastewater treatment system or burned in an incinerator. In view of the above, if methyl acetate could be recycled to be efficiently transesterified into other kinds of esters having higher economical value, the working performance of the polyvinyl alcohol plants will b...

Claims

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Application Information

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IPC IPC(8): C07C67/02
CPCC07C67/03C07C67/54C07C69/003C07C69/14Y02P20/10
Inventor HUANG, HSIAO-PINGYU, CHENG-CHINGLEE, MING-JERCHEN, JYUN-HONGCHENG, JIAN-KAI
Owner NAT TAIWAN UNIV
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