Title:
PREPARATION OF POLYPHENOL
Document Type and Number:
Japanese Patent JPH0291114
Kind Code:
A
Abstract:
PURPOSE:To obtain a polyphenol with high purity by reacting an arom. aldehyde with an excess amt. of phenol in the presence of an acid catalyst, washing off the acid catalyst with water and distilling off excess phenol. CONSTITUTION:In a method for preparing a polyphenol by reacting a phenol with an arom. aldehyde in the presence of an acid catalyst, the aimed polyphenol is obtd. by performing the reaction using an excess amt. of phenol, removing the acid catalyst in a condensate by washing with water and distilling off excess phenol. Said reaction, namely, dehydration condensation is performed in such a way that the phenol is generally in the range of 2-60mol, pref. 3-32mol based on 1mol of the arom. aldehyde and the acid catalyst is in the range of 0.01-10 pts.wt., pref. 0.2-5 pts.wt., at 60-200 deg.C for 1-10hr. As the acid catalyst used, hydrochloric acid, sulfuric acid, p-toluenesulfonic acid, phosphoric acid, etc., are cited.
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Inventors:
KANAYAMA KAORU
ONUMA YOSHINOBU
TAKEYAMA TADAO
ONUMA YOSHINOBU
TAKEYAMA TADAO
Application Number:
JP24295788A
Publication Date:
March 30, 1990
Filing Date:
September 28, 1988
Export Citation:
Assignee:
MITSUBISHI PETROCHEMICAL CO
International Classes:
C08G8/10; C08G8/00; (IPC1-7): C08G8/10
Domestic Patent References:
| JPS62267315A | 1987-11-20 | |||
| JPH01289822A | 1989-11-21 |
Attorney, Agent or Firm:
Takaya Yamamoto
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