PROCESS FOR PREPARATION OF BISPHENOL

Japanese Patent JP3446060

B2

PURPOSE: To provide bisphenols in high purity and having a good selectivity by adding specified amount of water to a free mixture of acetone and phenol and reacting while keeping catalytic activity of modified ion exchange resin for a long time.
CONSTITUTION: 4,4-dihydroxyphenylpropane is obtained by adding 0.6 to 5 weight %, preferably 1.2 to 2.9 weight % in particular, of water to the free mixture of aceton and phenols before the reaction to react using sulfonic acid ion exchanger resins modified with alkyl-SH groups. The suitable starting materials for this process are o-cresol, 2,6-dimethylphenol or the like especially phenol. The suitable ion exchanger resin for this process is sulfonated styrene polymer crosslinked with 2 to 4 weight % of divinylbenzene based on styrene, which may contain one or more sulfonic acid groups per one benzene nucleus of styrene, preferably the one nuetralized with cysteamine or the like.

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JP5868703	Method for producing olefin oxide, 1,2-diol, 1,2-diol ether, 1,2-carbonate or alkanolamine
WO/1997/023445	PROCESS FOR CONTINUOUSLY PREPARING DIALKYL CARBONATES AND DIOLS

Klaus Berg
Hans-Joseph Bouiscyu
Alfred Aitel
Gerhard Huenhof
Ott Immel
Ralph Pakull
Bernhard Behrle
Klaus Bruch

JP22232793A

September 16, 2003

August 16, 1993

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Bayer Aktiengesellschaft

C07C31/20; C07C37/20; C07C39/16; C07B61/00; (IPC1-7): C07C37/20; C07C39/16

JP5419951A
JP1203342A
JP62298454A
JP6470151A

Heikichi Odashima

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