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Process for preparing a carboxylic acid ester by reactif distillation

A technology of reactive distillation and carboxylate, applied in the field of producing carboxylate

Inactive Publication Date: 2006-08-16
SULZER CHEMTECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide further improvement for the method for producing carboxylate, wherein do not use alkali and just solve and contain carboxylic acid (especially acetic acid) problems

Method used

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  • Process for preparing a carboxylic acid ester by reactif distillation
  • Process for preparing a carboxylic acid ester by reactif distillation
  • Process for preparing a carboxylic acid ester by reactif distillation

Examples

Experimental program
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Embodiment Construction

[0015] The plant depicted in Figure 1 comprises a first column 1 in which the esterification is carried out by reactive distillation. This method is used in particular for the production of butyl acetate. This method is applicable to other carboxylic acid esters. Butyl acetate containing acetic acid is extracted from the bottom of the plant. This product is supplied in a deficient quality via line 71 to plant part 7 for cleaning.

[0016] According to the process of the invention, the feed materials are butanol, hereinafter referred to as alcohol A and acetic acid S. The bottom product of the first column 1, hereinafter referred to as the first bottom product, is in the plant part 7 and uses the second column 70 (see image 3 ) is further processed so that the weight content of acetic acid can be finally obtained as butyl acetate E (ester) below 100ppm. The washed product is withdrawn through line 71. The primary product separated in the second column, the second primary p...

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Abstract

Carboxylic ester is produced by esterification of carboxylic acid and an alcohol in a catalytic reaction zone of a first column. A carboxylic ester has a boiling point higher than those of educts of a carboxylic acid and an alcohol. In the esterification, a solid catalyst is used. The esterification and the separation by distillation are performed in three zones; a reaction zone, an upper separation zone, and a lower separation zone. A head portion product and a thump product are produced. A water phase is separated from an organic phase from the head portion product. Necessary heat (Q+) is supplied at a temperature set on the thump product. The carboxylic ester is obtained from the thump product. The removal of the carboxylic acid and the alcohol is performed by distillation. In this arrangement, heat is supplied to a thump product mainly comprising the carboxylic ester and containing small amounts of other substances, at a temperature at which a pressure higher than the ambient pressure is set on the thump product.

Description

technical field [0001] The invention relates to a process for the production of carboxylic acid esters by reactive distillation according to the preamble of claim 1 . In this process, the carboxylic acid ester must boil at a higher temperature than the educted carboxylic acid and alcohol. In particular the invention relates to a process for the production of butyl acetate or isobutyl acetate by esterifying acetic acid with butanol or isobutanol. It also relates to a device for carrying out the method according to the invention. Background technique [0002] Such an esterification process using reactive distillation is disclosed in WO-A994855. Butyl acetate or isobutyl acetate is obtained as a higher boiling sump product in a column in which acetic acid is esterified by reactive distillation with n-butanol or isobutanol catalysis, wherein the Catalysis is carried out in the reaction zone between the two separation zones. In the following, butanol (BuOH) will also be under...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C67/48C07C69/00
CPCB01J19/32B01J2219/32475B01J2219/32227B01J2219/00006C07C67/08B01J2219/32213B01J2219/32491B01J2219/32466B01D3/009B01J2219/32206Y02P20/10C07C69/14B42D11/00B42D15/0006B42D1/009
Inventor L·祖伯O·拜勒S·桑德尔H·梅尔霍菲
Owner SULZER CHEMTECH AG