Process for isomerization of product obtained from preparation of bisphenol from condensation reaction of ketone and phenol
A condensation reaction and isomerization technology, applied in the chemical field, can solve problems such as unspecified, accelerator pollution, etc.
Pending Publication Date: 2022-03-01
PTT GLOBAL CHEMICAL PUBLIC COMPANY LIMITED
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Problems solved by technology
However, this patent document does not point out the increase in the amount of 4,4'-isopropylidene diphenol product, and this patent has the disadvantage of pollution caused by accelerators in use in industrial applications
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preparation example Construction
[0058] Preparation of ion exchange resins according to the invention
[0059] Amberlyst 36 (Am36), a styrene-divinylbenzene copolymer type aromatic polymer with sulfonic acid groups, with a particle size in the range of about 600 microns to 850 microns, was used to prepare the ion exchange resins according to the present invention.
[0060] The accelerator was dissolved in about 20 mL of deionized water, and then added to about 20 g of styrene-divinylbenzene copolymer suspended in deionized water. Afterwards, the mixture was stirred at room temperature for about 1 hour. After stirring, the resulting mixture was loaded into a glass column and washed with deionized water. The residual sulfonic acid groups in the resulting solids were analyzed by titration with sodium hydroxide solution to determine the sulfonic acid groups (SO 3 H) Content before and after aromatic polymer modification. The percentage of sulfonic acid groups modified with accelerator can be calculated by th...
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Abstract
The present invention relates to a process for the isomerization of a product obtained from the preparation of bisphenol from the condensation reaction of ketone and phenol, the process comprising contacting the product obtained from the preparation of bisphenol from the condensation reaction of ketone and phenol with an ion exchange resin under aqueous conditions for the isomerization of undesired products, the ion exchange resin is an aromatic polymer having a sulfonic acid group modified with at least one accelerator selected from the group consisting of compounds of structure (I), and separating a product having a higher bisphenol content, in which the ion exchange resin is an aromatic polymer having a sulfonic acid group modified with at least one accelerator selected from the group consisting of compounds of structure (I);
Description
technical field [0001] The present invention relates to the field of chemistry, and in particular to chemical mixtures and chemical processes in the preparation of ion exchange resins for the isomerization of undesired products from the preparation of bisphenols. Background technique [0002] As we all know, bisphenol is a substance obtained by the condensation reaction of phenol and ketone, especially 4,4'-isopropylidenediphenol (4,4'-isopropylidenediphenol, 4,4'BPA), which is used in the preparation of polycarbonate The main desired bisphenol product as a precursor. The production technology of described bisphenol comprises the following steps: (1) the condensation reaction of acetone and phenol with acidic compound as catalyst; (2) the condensation product is dewatered and concentrated; (3) by cooling the mixture obtained in step (2) , and subsequently separate the crystals of 4,4'-isopropylidene diphenol from the mother liquor by filtration to obtain crystals of the 4,4...
Claims
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IPC IPC(8): C07C37/20C07C39/15C07C39/16C07C39/12C07C37/68C07C39/14
CPCC07C37/20C07C37/00B01J31/10B01J2231/52Y02P20/52C07C39/16C07C37/82
Inventor P·邦素里亚克S·隆旺萨S·唐阿蒙素克讪
Owner PTT GLOBAL CHEMICAL PUBLIC COMPANY LIMITED