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Method for producing isophorone

A technology of isophorone and acetone, applied in the field of preparation of isophorone, can solve problems such as difficult to achieve output rate and selectivity of isophorone

Inactive Publication Date: 2012-07-04
EVONIK DEGUSSA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to achieve high yield and isophorone selectivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0103] Embodiment, according to the present invention:

[0104] The crude isophorone mixture consisting of isophorone, low-boiling components, high-boiling components as well as water and catalyst produced in the manner described above is removed from the hydrolysis unit, cooled to about 40-60° C. and phase-separated. The comparison is 1 part organic phase, 4 parts aqueous phase. The aqueous phase then still contains 1% by weight of isophorone, which corresponds to approximately 4% by weight of the organic phase. During the subsequent distillation of the waste water, almost the entire isophorone fraction, and up to 75% by weight of water, are evaporated and introduced into the hydrolysis plant.

[0105] When the bottom product of the waste water column is cooled, the remaining 25% by weight of water is recovered by evaporation under reduced pressure.

[0106] For the calculation of 1 ton of isophorone product: increase the production of 4% by weight (about 40kg) isophorone, ...

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Abstract

The invention relates to a method for producing isophorone by catalyzed aldol condensation of acetone as an educt, reprocessing the reaction product, hydrolyzing the product stream, and separating into an organic and an aqueous fraction, obtaining isophorone from the organic fraction, distillatively reprocessing the aqueous fraction, and feeding the vapors from the head of the distillative reprocessing apparatus into the hydrolysis apparatus.

Description

technical field [0001] The invention relates to a preparation method of isophorone (3,5,5-trimethyl-2-cyclohexen-1-one). Background technique [0002] Isophorone is used especially as a high-boiling solvent in the paints, printing inks, adhesives and plant protection industries. According to the known prior art, isophorone can be further worked up, for example, to isophoronenitrile, isophoronediamine, isophoronediisocyanate or oxo (Keto)- isophorone. [0003] The so-called isophorone refers to the trimerization condensation product of acetone. The preparation of isophorone proceeds by the catalyzed aldol condensation of acetone. [0004] The existing patent literature and scientific publications for the preparation of isophorone basically fall into two areas. It is divided into liquid phase method and gas phase method. CN 101633610A also describes the condensation reaction of preparing isophorone with supercritical acetone. [0005] The gas phase processes described wo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/603C07C45/74C07C45/78
CPCC07C45/42C07C45/82C07C45/74C07C45/85C07C2101/16Y02P20/582C07C2601/16Y02P20/10C07C49/603
Inventor M·奥斯切尔R·詹森M·梅厄尔G·格伦德M·施瓦茨J-J·尼茨A·亨格斯特曼
Owner EVONIK DEGUSSA GMBH
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