C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
202/102, 260/531
C07C 51/44 (2006.01) B01D 3/10 (2006.01) C07C 63/04 (2006.01)
Patent
CA 2016347
A process for manufacturing high-purity o-toluic acid from a partial oxidation product of o-xylene is disclosed. o- Toluic acid is widely used as a raw material for agricultural chemicals, medicines, polymerization initiators, and the like. Depending on its use, 99% by weight or more purity is demanded for o-toluic acid. Hitherto, o-toluic acid having purity of higher than 99% by weight could not be obtained by fractionation, and purification by fractional crystallization was used. Fractional crystallization is, however, an expensive operation and not only gives a low yield of product but also results a large amount of waste water. The process disclosed herein gives an economical, commercial way to obtain high purity o-toluic acid. In summary, a process for the manufacture of high purity o-toluic acid which comprises: subjecting an oxidation product of o-xylene to distillation to remove therefrom low boiling point components such as unreacted o-xylene and benzoic acid, and high boiling point components, of which the major component is o-methylbenzyl o- toluate, thus obtaining crude o-toluic acid, treating said crude o-toluic acid with ammonia of an amount 1 to 1.2 mol equivalent of o-phthalic acid contained in said crude o-toluic acid, and subjecting the product thus treated to distillation is disclosed.
Matsumoto Shunichi
Shiokawa Yoshihiro
Takefumi Tadayoshi
Tokura Nobuyuki
Mitsubishi Gas Chemical Company Inc.
Riches Mckenzie & Herbert Llp
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