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专利名称：Separation/purification of para-hydroxybenzoic acid
发明人：Roger Cocco申请号：US06/924427申请日：19861029公开号：US04814498A公开日：190321
摘要：Essentially pure para-hydroxybenzoic acid crystals, typically containing but traceamounts of inorganic potassium salts and salicylic or 4-hydroxyisophthalic acid, welladopted for foodgrade applications, are facilely recovered from an aqueous solution ofdipotassium and/or monopotassium para-hydroxybenzoate by (i) adding an organicsolvent for para-hydroxybenzoic acid to such aqueous solution, in an amount sufficient todissolve the para-hydroxybenzoic acid corresponding to said potassium salts thereof, (ii)next adding thereto an at least stoichiometric amount, relative to said dipotassiumand/or monopotassium salt of para-hydroxybenzoic acid, and (iii) separating therefrom anessentially organic phase which comprises said para-hydroxybenzoic acid and an aqueousphase which comprises an inorganic potassium salt.
申请人：RHONE-POULENC SPECIALITES CHIMIQUES
代理机构：Burns, Doane, Swecker & Mathis
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