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US 4,181,601 AGranted
Feed hydrotreating for improved thermal cracking
AssigneeThe Lummus Company
InventorMorgan C. Sze
Life of this patent
Estimating the term…
Abstract
A pyrolysis feedstock, such as a gas oil feed, is hydrotreated in the presence of a bimetallic catalyst which has been promoted by the addition of chlorine and/or fluorine, preferably chlorine, followed by thermal cracking to increase the yields of light olefins and BTX.
Claims12
In a process for pretreating a feed for the subsequent production of light olefins and mononuclear aromatics by thermal cracking wherein the feed is catalytically hydrotreated without excessive hydrocracking and gas production, the improvement comprising:
- said hydrotreating being effected at a temperature of from 640.degree. F. to 950.degree. F. and a pressure of from 750 to 2500 psig, in the presence of a catalyst containing at least one group VI metal selected from the group consisting of tungsten and molybdenum and at least one group VIII metal selected from the group consisting of nickel and cobalt, said catalyst being promoted with at least 0.5 weight% of a member selected from the group consisting of fluorine, chlorine and mixtures thereof to thereby alter the feed to increase the yield of light olefins and mononuclear aromatics in the subsequent thermal cracking thereof.
Dependencies are inferred from the claim text.