Conversion of aromatic carboxylates to terephthalate

Details Conversion of aromatic carboxylates to terephthalate Conversion of aromatic carboxylates to terephthalate

1978-06-12

1980-10-28

Myers, Jane S.

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

Organic compounds

Carboxylic acids and salts thereof

562482, C07C 51347, C07C 51353

Patent

active

042308852

ABSTRACT:
Mixture of salts of aromatic mono- or polycarboxylic acids are converted to terephthalate salts in presence of selected catalyst or catalyst mixture, e.g., a mixture of potassium, sodium and cesium benzoates, is disproportionated in the presence of zinc and/or a zinc salt or a mixture of zinc and/or cadmium and a zinc and/or cadmium salt. The mixture of compounds which are to be converted to terephthalate salts will contain at least those of two different alkali metals. A formula m+n is equal to at least 4 is given for determining the catalyst, or catalysts, to be employed. In one embodiment, now preferred, a mixture of sodium, potassium, and cesium benzoates is heated at a reaction temperature of the order of 350.degree.-430.degree. C., more preferably 380.degree.-415.degree. C., in presence of a catalytic mixture of zinc and cadmium benzoates to obtain high yields and rates of reaction at temperatures substantially below those needed in the prior art for similar or better yields, etc. Other compounds to be converted, catalysts and embodiments are disclosed.

REFERENCES:
patent: 3093683 (1963-06-01), Raecke et al.
patent: 3096366 (1963-07-01), Smith et al.
patent: 3101368 (1963-08-01), Schenk
patent: 3225088 (1965-12-01), Takagi et al.
patent: 3641130 (1972-02-01), Kuper
patent: 3761515 (1973-09-01), Lind et al.

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