Process for producing terephthalic acid with high purity

Details Process for producing terephthalic acid with high purity Process for producing terephthalic acid with high purity

1980-02-08

1981-07-28

Siegel, Alan

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

C07C 5116

Patent

active

042811791

ABSTRACT:
Terephthalic acid with a high purity and high whiteness is produced by oxidizing p-tolualdehyde with molecular oxygen such as air in the presence of a heavy metal catalyst of manganese and/or cerium, a bromine compound, and a mineral acid in water as a solvent at a bromine compound concentration of 0.5-12% by weight on the basis of the reaction solution in terms of bromine ions and at a ratio of g-equivalents of hydrogen ions of the mineral acid to sum total of g-equivalents of the hydrogen ions and manganese and/or cerium ions of 1-85% and at a ratio of sum total of g-equivalents of the hydrogen ions and manganese and/or cerium ions to g-equivalents of bromine ions of 0.5-5. Terephthalic acid thus produced is directly polymerizable with glycols without any purification.

REFERENCES:
patent: 2907792 (1959-10-01), McIntyre
patent: 3012038 (1961-12-01), O'Neill et al.
patent: 3944601 (1976-03-01), Kuhlmann

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