Process for the preparation of terephthalic, isophthalic and pht

Details Process for the preparation of terephthalic, isophthalic and pht Process for the preparation of terephthalic, isophthalic and pht

1979-08-01

1980-12-16

Helfin, Bernard

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

Organic compounds

Oxygen containing

C07C 4529

Patent

active

042397030

ABSTRACT:
A process for the preparation of a terephthalic, isophthalic or phthalic dialdehyde is described by dehydrogenation of the corresponding xylylene glycol in the vapor phase at 250.degree. to 500.degree. C. The process is carried out in the presence of oxygen, water vapor and a dehydrogenation catalyst, suitably a silver dehydrogenation catalyst.

REFERENCES:
patent: 2806883 (1957-09-01), Mikeska et al.
patent: 2864865 (1958-12-01), Errede et al.
patent: 3692840 (1972-09-01), Frangatos
patent: 4140722 (1979-02-01), Williams et al.

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