Manufacture of benzene, toluene and xylene

Details Manufacture of benzene, toluene and xylene Manufacture of benzene, toluene and xylene

1978-09-25

1980-07-08

Levine, Herbert

Chemistry of hydrocarbon compounds

Plural serial diverse syntheses

To produce aromatic

585474, 585475, 585481, 585905, C07C 362, C07C 530

Patent

active

042118867

ABSTRACT:
Benzene, toluene and xylene are produced in high yield from aromatic naphtha by a processing technique which combines (1) high temperature isomerization of eight carbon atom aromatics over a catalyst having relatively low activity and constrained access to the internal pore surface and (2) processing of heavy single ring aromatics of nine or more carbon atoms together with toluene under dealkylation/transalkylation conditions. The effluents of the two reactions are blended for processing through separation and recovery equipment. The unique chemistry of the isomerization stage results in splitting off alkyl side chains of two or more carbon atoms while retaining methyl groups attached to aromatic rings. Because of these reaction characteristics, full range reformate is advantageously added to the isomerizer charge for conversion to methyl benzene and redistribution of methyl groups to the thermodynamic equilibrium values.

REFERENCES:
patent: 3965209 (1976-06-01), Butter et al.
patent: 4039599 (1977-08-01), Gewartowski
patent: 4101597 (1978-07-01), Breckenridge

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