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1 746 654

(13)

A1

(51)

IPC

(21) (22)

Application

4787249/04, 1990-01-29

(22)

Actual filing date

1990-01-29

(45)

Published

1995-01-09

(72)

Inventor

Poljakova L.V.Krjukova Ju.I.Khoroshikh A.P.

METHOD OF PURIFICATION OF 2,6-BIS-(2'-HYDROXY-5'-CHLOROBENZYL)-4-CHLOROPHENOL Russian patent published in 1995 - IPC

Abstract SU 1746654 A1

FIELD: chemical and pharmaceutical industry. SUBSTANCE: technical 2,6-bis(2'-hydroxy-5'-chlorobenzyl)-4-chlorophenol, empirical formula is C2OH14O3C13, is dissolved in 70-80 wt.-% aqueous isopropyl alcohol at 65-75 C taking 5-6 volumes per unit of product mass. Crystallization is carried out by addition of distilled water for 30-40 min at quantity providing alcohol concentration 44-46 wt.-%, at constant stirring. EFFECT: improved method of product purification. 2 tbl

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SU 1 746 654 A1

Authors

Poljakova L.V.

Krjukova Ju.I.

Khoroshikh A.P.

Dates

1995-01-09—Published

1990-01-29—Filed

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