C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/510.7
C07C 63/14 (2006.01) C07C 51/265 (2006.01)
Patent
CA 1062279
SECONDARY OXIDATION OF FLUID EFFLUENT FROM PRIMARY OXIDATION OF META- OR PARA-XYLENE ABSTRACT OF THE DISCLOSURE Primary catalytic oxidation of m- or p-xylene with air in the presence of acetic acid solution of metal and bromine com- ponents of catalysis at temperatures from 130 to 250°C and at elevated pressure to maintain a liquid phase of the acetic acid solution produces a fluid oxidation effluent which is a suspen- sion of crystalline iso- or terephthalic acid in liquid acetic acid mother liquor containing, in addition to dissolved components of catalysis, some dissolved phthalic acid product and smaller amounts of both oxygen-containing precursors of such product and oxygen-containing aromatic co-products. By the present inventive concept such fluid effluent is subjected to continuous secondary air oxidation under liquid phase conditions as it is being cooled to precipitate additional phthal- ic acid product. Such secondary oxidation permits lowering the concentration of catalyst components in the primary oxidation, improves yield and quality of the phthalic acid product, signifi- cantly lowers acetic acid oxidation, and permits recycle to the primary oxidation of a major portion of solids content of acetic acid mother liquor as a source of components of catalysis.
263924
Fisher Jay A.
Stark Leonard E.
Wampfler Gene L.
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