Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1995-10-11
1997-07-15
Shaver, Paul F.
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
568724, C07C 3768, C07C 3912
Patent
active
056485611
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/CN94/00011, filed Feb. 14, 1994.
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a process for the production of high purity or polycarbonate grade and ultrapure bisphenol-A. More particularly, the present invention relates to a simplified process for the production of high purity and ultrapure 2,2-bis (4-hydroxyphenyl)propane (bisphenol-A, hereinafter sometimes referred to as "4,4-BPA" or "p,p-BPA" or simply identified as "BPA") in a high conversion of feedstocks(phenol and acetone) and a high selectivity to bisphenol-A by the condensation reaction of phenol and acetone in the presence of a modified ion-exchange resin catalyst using a novel multiple stage suspended reactive stripping technique and thereafter, without any intermediate concentration of the condensate or liquid condensation reaction mixture discharged from the reaction stage, by making use of a novel fine crystal destruction technique in the step of crystallization and a novel vapor-solid dephenolization technique in the step of phenol removal. In a further aspect, the present invention pertains to a novel arrangement of a multiple stage suspended reactive stripping apparatus from which the effluent is directly subjected to the step of crystallization operation without any intermediate concentration of the resulting condensation reaction mixture effluent since it has a bisphenol-A concentration sufficient to form immediately adduct crystals of bisphenol-A and phenol with 1:1 molar ratio when cooled.
BACKGROUND ART OF THE INVENTION
Bisphenol-A is a feedstock or intermediate product for the commercial production of various polymers including the polyarylates, polyamides, polyetherimides, polysulfones and polycarbonates, epoxy resins and modified phenol-formaldehyde resins. Colorless and high purity bisphenol-A has to be used to produce high quality polycarbonates.
Polycarbonates are in turn essential engineering plastics. They have excellent resistance to high temperatures, high impact resistance and good insulation resistance. These polymers play a more and more important role in the industrial fields such as, for example, chemical, mechanical and electric/electronic engineerings. Recently, laser data storage discs have found widespread applications in the industries such as, for example, computer and video-audio industries since optical data storage techniques have a variety of tremendous advantages. The feedstock for the production of an optical data storage substrate must be a polycarbonate which is prepared by means of nearly colorless and ultrapure bisphenol-A (the content of bisphenol-A is higher than about 99.99% by weight). An ultrapure bisphenol-A not only has higher purity but also should satisfy the extremely strict standards with respect to color, transmisivity, ash and iron contents or the like. This raises higher requirements in relation to the synthesis and purification of bisphenol-A than the production of usual polycarbonate grade bisphenol-A.
Bisphenol-A is produced by the condensation reaction of phenol and acetone, using an excess of phenol, in the presence of an acidic catalyst optionally with a promotor. ##STR1## The reaction product mixture contains unreacted phenol and acetone, water formed during the reaction and by-products in addition to bisphenol-A.
The by-products which are formed during the condensation reaction of phenol and acetone include predominantly 2-(2-hydroxyphenyl)-2-(4-hydroxyphenyl)propane (hereinafter sometimes also simply identified as "2,4-BPA" or "o,p-BPA") and the Dianin's compound. Additionally, there are present in the reaction mixture small amounts of 2,4-bis [2-(4-hydroxyphenyl)isopropyl]phenol (hereinafter also sometimes identified as "triphenol"), polyphenol and some undesirable coloring substance. The presence of such by-products and impurities in a bisphenol-A product results in a decrease in the quality or performance properties of for example resins that are manufactured by making use of bisphenol-A.
In general, a process for the
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Li Chuanzhao
Liu Zongzhang
Qian Shenghua
Tan Qiu
Yu Shenbo
China Petro-Chemical Corporation
Shaver Paul F.
Tianjin University
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