Preparation of bisphenol A
A technology of bisphenol and phenol, applied in the field of bisphenol A/phenol adduct crystal, can solve the problems of unattractive production of a large number of chemicals, crystal pollution and the like
Active Publication Date: 2022-06-17
SABIC GLOBAL TECH BV
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Problems solved by technology
[0009] These commercial processes all have the disadvantage that the crystals are still largely contaminated with two specific isomeric species: mainly o,p-BPA and BPX-2
Such long residence times require very large vessels and are economically unattractive for high-volume chemical production
Method used
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Embodiment approach 1
[0107] Embodiment 1: A method of preparing bisphenol A, comprising: reacting phenol and acetone in the presence of an acidic catalyst to form a reaction product comprising bisphenol A; crystallizing the bisphenol A / phenol adduct from the reaction product wherein the crystallization is carried out in the presence of an acid, and preferably wherein the total amount of acid present during the crystallization step is 5% or less based on the total weight of the reaction product.
Embodiment approach 2
[0108] Embodiment 2: The method of Embodiment 1 wherein the total amount of acid present during the crystallization step is 4% or less, preferably 3% or less, based on the total weight of the reaction product.
Embodiment approach 3
[0109] Embodiment 3: The method of Embodiment 1 or 2, wherein the amount of water during the reaction of step a) is 5% or less based on the total weight of the reaction mixture.
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Abstract
The invention relates to a preparation method of bisphenol, the use of acid in the bisphenol A / phenol adduct crystallization method, and the bisphenol A / phenol adduct crystal. A process for preparing bisphenol A comprising: a) reacting phenol and acetone in the presence of an acidic catalyst to form a product mixture containing bisphenol A; and b) crystallizing a bisphenol A / phenol adduct from said product mixture, wherein The crystallization is carried out in the presence of an acid, wherein the total amount of acid present during the crystallization step is 5% or less, based on the total weight of the reaction product.
Description
technical field [0001] The present invention relates to a process for the preparation of bisphenol, to the use of an acid in a crystallization process of bisphenol A / phenol adduct, and to bisphenol A / phenol adduct crystals. Background technique [0002] Bisphenol A (2,2'-bis(4-hydroxyphenyl)propane, also known as p,p-BPA) is mainly used as an intermediate in the production of other products. The main uses of bisphenol A are the bonding, plasticizing and hardening functions in plastics, paints / varnishes, adhesives and fillers. The main use of bisphenol A is in the production of polycarbonate resins, epoxy resins, unsaturated polyesters, polysulfones, polyetherimides and polyarylate resins. [0003] Bisphenol A is prepared commercially by condensing 2 moles of phenol with 1 mole of acetone in the presence of an acid catalyst, as shown in equation (1) below. [0004] [0005] Phenol is present in the reaction in moles in excess of the stoichiometric requirement. During th...
Claims
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IPC IPC(8): C07C37/20C07C37/84C07C39/16
CPCC07C37/20C07C37/84C07C39/16
Inventor 保卢斯·约翰内斯·马里亚·埃斯鲍茨雷内·海因科
Owner SABIC GLOBAL TECH BV