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Process for producing high-purity bisphenol A and production apparatus

A manufacturing method and bisphenol technology are applied in the field of manufacturing and manufacturing equipment of high-purity bisphenol A, and can solve the problems such as no introduction, no disclosure of free acid removal process, etc.

Active Publication Date: 2013-05-29
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in Patent Documents 1 to 4, there is no description of the production method 2 including the isomerization step, and there is no disclosure at all that a free acid removal step is provided in the isomerization step.

Method used

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  • Process for producing high-purity bisphenol A and production apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Before the mother liquor is subjected to isomerization treatment, except that in the free acid removal tower filled with weakly basic anion exchange resin (manufactured by R&H "Amber-list (registered trademark) A21"), the reaction temperature is 75 ° C, LHSV = 1hr -1 Except for processing under the above conditions, the same operation as the reference example was carried out to manufacture product bisphenol A, wherein the mother liquor was obtained in the solid-liquid separation process using a horizontal belt filter, and the mother liquor was extracted from the mother liquor in a distillation tower. The water concentration was adjusted to 0.5% by mass. The hue of the obtained bisphenol A is APHA15, and its quality can be maintained for one year.

Embodiment 2

[0086] After the mother liquor is subjected to isomerization treatment, except in the free acid removal tower filled with weakly basic anion exchange resin ("Amba-list (registered trademark) A21" manufactured by R&H Company) at a reaction temperature of 75 ° C, LHSV = 1hr -1 Except for processing under the above conditions, the same operation as the reference example was carried out to manufacture product bisphenol A, wherein the mother liquor was obtained in the solid-liquid separation process using a horizontal belt filter, and the mother liquor was extracted from the mother liquor in a distillation tower. The water concentration was adjusted to 0.5% by mass. The hue of the obtained bisphenol A is APHA15, and its quality can be maintained for one year.

Embodiment 3

[0088] Before the mother liquor is subjected to isomerization treatment, except that it is filled with strongly acidic cation exchange resin (manufactured by Mitsubishi Chemical; "Daiyaion (registered trademark) SK104H") mixed with a volume ratio of 1: 1 and weakly basic anion exchange resin ( In the free acid removal tower of "Amba-list (registered trademark) A21" manufactured by R&H Co., Ltd., at a reaction temperature of 75°C and LHSV=1hr -1 Except for processing under the above conditions, the same operation as the reference example was carried out to manufacture product bisphenol A, wherein the mother liquor was obtained in the solid-liquid separation process using a horizontal belt filter, and the mother liquor was extracted from the mother liquor in a distillation tower. The water concentration was adjusted to 0.5% by mass. The hue of the obtained bisphenol A is APHA15, and its quality can be maintained for one year.

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Abstract

A process for producing bisphenol A containing a free-acid removing step in the following step (D) so as to remove free acid contained in a mother liquid or an isomerized liquid, in a process for producing bisphenol A including: a condensation reaction step (A) reacting phenol with acetone in the presence of an acidic catalyst, a concentration step (B) concentrating the reaction mixture, a crystallization and solid-liquid separation step (C) separating into an adduct of bisphenol A and phenol and a mother liquid by cooling the concentrated reaction mixture, an isomerization step (D) isomerizing the whole of the mother liquid with an isomerization catalyst and circulating the resultant isomerized liquid to the step (A) and / or step (B), as necessary, a recovery step (E) recovering an adduct of bisphenol A and phenol from part of the isomerized liquid treated in the step (D), an adduct decomposition step (F) preparing a bisphenol A melt by removing phenol from the adduct obtained in the step (C), and a prilling step (G) preparing product prill by granulating the bisphenol A melt.

Description

technical field [0001] The present invention relates to a method for producing high-quality bisphenol A, especially excellent in transparency (hue) and equipment for producing the bisphenol A. The method is: isomerization chemical In the process, the acidic catalyst used in the condensation reaction step and the isomerization catalyst used in the isomerization treatment step for isomerizing the entire mother liquor obtained in the crystallization-solid-liquid separation step are removed. acid. Background technique [0002] In recent years, polycarbonate, which is increasingly in demand as an engineering plastic, especially as an optical material such as a substrate for an optical disc, is rapidly increasing in demand. [0003] Polycarbonate used as an optical material is required to be infinitely transparent (low hue), and of course, the same is required for bisphenol A as a raw material. [0004] Typically, bisphenol-A is produced by reacting acetone and a large excess of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C37/82C07C37/86C07C39/16B01D9/02C07B61/00
CPCB01D9/0059C07C37/86C07C37/84C07C37/20C07C37/00C07C39/16B01D9/02C07C37/82
Inventor 吉富一之儿玉正宏增田修一小比类卷润山崎北斗
Owner IDEMITSU KOSAN CO LTD