Process for producing benzene carboxylic acid salts from aromati

Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof

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562407, 562485, 562486, 562494, C07C 5116, C07C 5142

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043755534

ABSTRACT:
This invention relates to a method of producing an aqueous solution which comprises soluble benzene carboxylic acid salts which is substantially free of soluble humic acid salts. A first aqueous solution (22) which comprises soluble humic acid salts and soluble benzene carboxylic acid salts is reacted with carbon dioxide (32) and an inorganic chemical (34) selected from the group consisting of magnesium bicarbonate, magnesium carbonate, a double salt of magnesium carbonate, and mixtures thereof in a mixing zone (30) under conditions operable for converting the soluble humic acid salts to precipitated magnesium humic acid salts while maintaining the soluble benzene carboxylic acid salts in solution. The reacted first aqueous solution (36) is then separated in a separation zone (40) into (i) a second aqueous solution (44) which comprises the soluble benzene carboxylic acid salts and which is at least substantially free of soluble humic acid salts, and (ii) a mixture (42) which comprises precipitated magnesium humic acid salts.

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