Process for the manufacture of styrene

Details Process for the manufacture of styrene Process for the manufacture of styrene

1980-05-30

1982-09-21

Killos, Paul J.

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

Organic compounds

Carboxylic acids and salts thereof

560254, 568814, 585440, C07C 5112

Patent

active

043508251

ABSTRACT:
A method to synthesize styrene from toluene by: (a) oxidizing toluene to form oxygenated toluene derivatives; (b) carbonylating said oxygenated products in the presence of a carbonylation catalyst and preferably a halogen promoter to produce phenylacetic acid; (c) hydrogenating said phenylacetic acid to synthesize phenylethyl alcohol; and (d) dehydrating said phenylethyl alcohol to obtain a high yield of styrene. In a preferred embodiment, a two-step, three-phase separation process can be employed for the separation and recovery of the phenylacetic acid formed in step (b) from the carbonylation catalyst and the halogen promoter which may have been employed in the carbonylation step (b) mentioned above by first separating the carbonylation product mixture into a gas-phase mixture and a liquid-phase mixture containing the phenylacetic acid, the carbonylation catalyst and the promoter; and then crystallizing the phenylacetic acid contained in the liquid-phase mixture in order to separate and thereafter recover the crystallized phenylacetic acid from the remaining liquid-phase mixture containing the carbonylation catalyst and the promoter.

REFERENCES:
patent: 3769326 (1973-10-01), Paulik et al.
patent: 3928429 (1975-12-01), El-Chahaur et al.
patent: 4128572 (1978-12-01), Cassar et al.

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