Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1986-10-29
1989-03-21
Killos, Paul J.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
C07C 6501
Patent
active
048144983
ABSTRACT:
Essentially pure para-hydroxybenzoic acid crystals, typically containing but trace amounts of inorganic potassium salts and salicylic or 4-hydroxyisophthalic acid, well adopted for foodgrade applications, are facilely recovered from an aqueous solution of dipotassium and/or monopotassium para-hydroxybenzoate by (i) adding an organic solvent for para-hydroxybenzoic acid to such aqueous solution, in an amount sufficient to dissolve the para-hydroxybenzoic acid corresponding to said potassium salts thereof, (ii) next adding thereto an at least stoichiometric amount, relative to said dipotassium and/or monopotassium salt of para-hydroxybenzoic acid, and (iii) separating therefrom an essentially organic phase which comprises said para-hydroxybenzoic acid and an aqueous phase which comprises an inorganic potassium salt.
Killos Paul J.
Rhone-Poulenc Specialites Chimiques
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