Process for the preparation of isophorone in a waste water tower in the presence of at least one defoamer in the workup section

A technology of isophorone and defoamer, which is applied in the field of preparing isophorone (3,5,5-trimethyl-2-cyclohexen-1-one), can solve the problem of difficult to achieve high yield rate and selectivity of isophorone

Active Publication Date: 2016-07-27
EVONIK OPERATIONS GMBH
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

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

Method used

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Examples

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Embodiment

[0130] Embodiment, according to the present invention:

[0131] Essentially aqueous solutions containing <5% by weight of organic components (isophorone, acetone and other low boilers and products of higher condensation) are worked up by distillation in order to separate the organic components from the aqueous phase. Here, the temperature of the vapor is in the range of 200-300° C. and the pressure in the column (wastewater column) is in the range of 20-60 bar. Among them, the steam at the top of the waste water tower is sent to the hydrolysis tower. An aqueous solution of polyether polyol as an antifoaming agent was replenished into the wastewater column so that the total amount of polyether polyol in the wastewater column was 0.01% by weight. The addition of polyether polyols results in an almost complete prevention of foam formation and thus enables automatic operation of the waste water column by means of fill level measurement without manual intervention. The separation...

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Abstract

The present invention relates to a process for the preparation of isophorone in the presence of at least one defoamer in a waste water column in the workup section, in particular the invention relates to the presence of at least one defoamer in the waste water column in the workup section Process for the preparation of isophorone (3,5,5-trimethyl-2-cyclohexene-1-one) in the absence of a defoamer.

Description

technical field [0001] The invention relates to the preparation of isophorone (3,5,5-trimethyl-2-cyclohexen-1-one) in a waste water column in the working-up section in the presence of at least one defoamer method. Background technique [0002] Isophorone is used especially as a high-boiling solvent in the paints, printing inks, adhesives and plant protection industries. According to known prior art, isophorone can be further worked up, for example, to isophoronenitrile, isophoronediamine, isophoronediisocyanate or oxo (Keto)-iso Pholone. [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. CN101633610A also describes the condensation reaction of prepar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C49/603C07C45/86
CPCC07C45/74C07C45/85Y02P20/582C07C45/82Y02P20/10C07C49/603
Inventor M.奥尔舍尔R.彦森M.迈尔J-J.尼茨M.施瓦茨
Owner EVONIK OPERATIONS GMBH
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