Method for preparing solid p-disodium hydroxybenzoate

Details Method for preparing solid p-disodium hydroxybenzoate Method for preparing solid p-disodium hydroxybenzoate

1987-04-28

1988-03-15

Killos, Paul J.

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

Organic compounds

Carboxylic acids and salts thereof

C07C 6501

Patent

active

047314753

ABSTRACT:
The present invention provides a method for preparing solid p-disodium hydroxybenzoate which is characterized by comprising the steps of reacting phenol, carbon tetrachloride in an amount of 0.9 to 1.2 moles per mole of phenol and sodium hydroxide in an amount of 7 to 20 moles per mole of phenol prior to the reaction in an aqueous liquid containing 10 to 40% by weight of p-disodium hydroxybenzoate and/or sodium chloride in the presence of a transition metal powder in an amount of 0.01 to 1.00% by weight based on the weight of a reaction system at a reaction temperature of 50.degree. to 150.degree. C.; cooling the resulting reaction mixture to a level of -20.degree. to +20.degree. C.; and separating said p-disodium hydroxybenzoate therefrom.

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