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Process for producing bisphenol A

A technology for bisphenol and phenol, which is applied in the field of effectively preparing bisphenol A, and achieves the effects of reducing the processing capacity, prolonging the lifespan, and achieving good effects.

Active Publication Date: 2012-10-10
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] But at present, do not see any literature discussing prolonging the life-span of the sulfonic acid type cation exchange resin used as catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070]Phenol and acetone with a molar ratio of 10:1 were treated with LHSV for 3 hours -1 It was continuously passed into a fixed-bed reaction tower filled with a resin obtained by partially neutralizing sulfonic acid groups of a cation exchange resin [manufactured by Mitsubishi Chemical Co., Ltd., "DIAION SK104H"] with 20 mol% of 2-mercaptoethylamine, The condensation reaction was carried out at 75°C.

[0071] Under the conditions of the bottom temperature of 170°C and the pressure of 67kPa, acetone, water, etc. were removed from the resulting reaction mixture by vacuum distillation, and then under reduced pressure distillation at the temperature of 130°C and the pressure of 14kPa, phenol was distilled off and concentrated A phenol / bisphenol A solution was obtained until the bisphenol A concentration was 40% by mass.

[0072] Next, water was added to the phenol / bisphenol A solution having a bisphenol A concentration of 40% by mass, cooled to 50° C. under reduced pressure and...

Embodiment 2

[0077] In Example 1, it carried out similarly to Example 1 except having adjusted the water|moisture content of the mother liquor obtained by filtering the bisphenol A / phenol addition product (adduct) to 0.80 mass %. Table 1 shows the measurement results of the 2,4-isomer conversions at each reaction time. When the reaction time was 8,000 hours, the 2,4-isomer conversion was 30%, and the catalyst lifetime ratio was 2.29. It can be seen that at LHSV=0.3 hours -1 In a commercial device, the time for the 2,4-isomer conversion rate to reach 30% is 24,000 hours, and it can operate continuously for 3 years.

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PUM

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Abstract

A liquid containing one or more bis(hydroxyphenyl)propane compounds is brought into contact with a strongly acid cation-exchange resin to isomerize any bis(hydroxyphenyl)propane compound other than bisphenol A [2,2-bis(4-hydoxyphenyl)propane]. The liquid containing one or more bis(hydroxyphenyl)propane compounds is regulated so as to have a water concentration of 0.2-0.9 mass%. Thus, the life of the isomerization catalyst in this process for bisphenol A production, which includes the isomerization step, can be prolonged and bisphenol A can be efficiently produced. The amount of the catalyst to be discarded is reduced.

Description

technical field [0001] The present invention relates to a method for preparing bisphenol A [2,2-bis(4-hydroxyphenyl)propane] having an isomerization reaction step, in particular, it relates to prolonging the life of the isomerization reaction catalyst, effectively preparing bisphenol A Phenol A method. Background technique [0002] Bisphenol A is an important compound as a raw material for epoxy resins and polycarbonate resins, and its use and demand have been increasing in recent years. [0003] Bisphenol A is usually prepared by condensation reaction of excess phenol and acetone in the presence of an acidic catalyst, and by cooling the concentrated solution of the reaction mixture, the addition product of bisphenol A and phenol is crystallized and separated into the Addition product and mother liquor, decomposition of the addition product (adduct). [0004] In the mother liquor obtained when the above-mentioned addition product of bisphenol A and phenol is crystallized, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C37/86C07B61/00C07C37/20C07C37/48C07C39/16
CPCC07C37/86C07C37/84C07C37/685C07C37/70C07C37/74C07C37/20C07C37/00C07C39/16C07B61/00
Inventor 吉富一之児玉正宏增田修一
Owner IDEMITSU KOSAN CO LTD