Method of purifying 4-fluorophenol

Details Method of purifying 4-fluorophenol Method of purifying 4-fluorophenol

1984-05-25

1985-06-11

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568775, C07C 3786, C07C 3768

Patent

active

045230412

ABSTRACT:
A method of efficiently purifying crude 4-fluorophenol containing phenol as impurity. Phthalic acid or its anhydride, or a suitable derivative of phthalic acid, and a dehydrating agent such as sulfuric acid or a metal chloride are mixed with the crude 4-fluorophenol, and the mixture is kept in a liquid state usually with moderate heating to 30.degree.-180.degree. C. until completion of condensation reaction between phenol and the phthal-compound. After that pure 4-fluorophenol can easily be recovered by distillation or recrystallization.

REFERENCES:
patent: 2934569 (1960-04-01), Kuchlewind
patent: 2950325 (1960-08-01), Britton et al.
"J. Organic Chem.", vol. 26, (1961) p. 4641.

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