Bis(4-halo-phthalic acid) quarter salt, process for their prepar

Details Bis(4-halo-phthalic acid) quarter salt, process for their prepar Bis(4-halo-phthalic acid) quarter salt, process for their prepar

1990-09-07

1991-11-26

Dees, Jose G.

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

Organic compounds

Carboxylic acids and salts thereof

560 83, 562485, C07C 6320, C07C 5141, C07C 51487

Patent

active

050684094

ABSTRACT:
The bis(4-halo-phthalic acid) quarter salt of formula ##STR1## wherein M is an alkali metal or ammonium, and X is a halogen atom is descibed. Further described is a process for its preparation and a method of purifying 4-halo-phthalic acid containing impurities, which comprises preparing therefrom a compound of formula I, separating the compound of formula I which precipitates from the mother liquor, washing it and recovering the 4-halo-phthalic acid.

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