Chemistry of hydrocarbon compounds – Aromatic compound synthesis – By alkyl or aryl transfer between molecules – e.g.,...
Patent
1977-10-04
1979-07-24
Levine, Herbert
Chemistry of hydrocarbon compounds
Aromatic compound synthesis
By alkyl or aryl transfer between molecules, e.g.,...
208 64, 208 92, 208 65, 585474, 585475, 585478, 585481, 585489, 585752, 585841, C07C 358, C10G 3506
Patent
active
041622146
ABSTRACT:
A method of preparing benzene and xylenes from catalysates of reforming of gasoline fractions comprising a mixture of aromatic C.sub.6 -C.sub.10 hydrocarbons and non-aromatic hydrocarbons which involves separation of a low-boiling fraction boiling out at a temperature of 90.degree.-108.degree. C. from a reforming catalysate by rectification. The remaining high-boiling fraction is processed in the presence of a hydrogen-containing gas at a temperature within the range of from 450.degree. to 600.degree. C. under a pressure of from 10 to 60 atm on a catalyst. The catalyst consists of 1 to 85% by weight of H-mordenite, 0.1 to 10% by weight of a hydrogenating component as which use might be made of oxides of metals of Group VI of the periodic system, sulphides of these metals, metals of Group VIII of the periodic system, sulphides thereof; the balance being a binder. As a result, a liquid product is formed comprising a mixture of aromatic hydrocarbons which is separated by rectification to give benzene, toluene, total xylenes, a mixture of aromatic C.sub.9 -C.sub.10 hydrocarbons; at least one of the following streams of hydrocarbons prepared by rectification of the liquid product is recycled back to the stage of processing of a high-boiling fraction: toluene, toluene along with a portion of hydrocarbons boiling out at a temperature exceeding the boiling point of toluene.
The method according to the present invention makes it possible to increase the benzene yield by 3 to 4 times and the yield of xylenes by 1.2-2 times as compared to the content thereof in the reforming catalysate. The method also enables a substantial simplification in the isolation of the desired products.
REFERENCES:
patent: 3671602 (1972-06-01), Inoue et al.
patent: 3945913 (1976-03-01), Brennan et al.
patent: 3957621 (1976-05-01), Bonacci et al.
patent: 4070408 (1978-01-01), Vickers
patent: 4078990 (1978-03-01), Brennan et al.
Gokhman Boris K.
Maslyansky Gdal N.
Rabinovich Georgy L.
Seleznev Viktor D.
Treiger Leonid M.
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