Mineral oils: processes and products – Chemical conversion of hydrocarbons – With preliminary treatment of feed
Patent
1976-12-06
1977-10-11
Crasanakis, George
Mineral oils: processes and products
Chemical conversion of hydrocarbons
With preliminary treatment of feed
260672T, C10G 2300, C10G 3400
Patent
active
040533883
ABSTRACT:
This invention is directed to producing a high yield of aromatics from naphtha by integrating a catalytic reformer and a thermal hydrocracking unit followed by fractionating the product stream to obtain the desired aromatic. In this process, after sulfur is removed, the naphtha is catalytically reformed under conditions adapted to provide the maximum aromatic content. The reformed stream is then thermally hydrocracked, preferably in a system containing multiple reactors. The process does not require an external source of hydrogen since the reforming and hydrocracking units are operated to maintain a hydrogen balance. The hydrocracked stream is fractionated in a series of columns to produce the desired mix of aromatics. In one example, the fractionation separates out (1) benzene, which is further purified, if necessary (2) a toluene stream and a C.sub.9 + aromatic stream which are charged to a transalkylation reactor to produce a composition containing mixed xylenes sent to recycle and (3) a mixed xylene stream from which paraxylene is separated by a liquid-solid adsorption technique and from which the remaining xylenes are isomerized to produce further paraxylene. A by-product stream of light hydrocarbons is also produced. This procedure can be readily modified to produce greater amounts of benzene and/or toluene and less xylene.
REFERENCES:
patent: 3105811 (1963-10-01), Engel
patent: 3192150 (1965-06-01), Taylor et al.
patent: 3542667 (1970-11-01), McMahon et al.
patent: 3714023 (1973-01-01), Stine
patent: 3927135 (1975-12-01), Suggitt et al.
Crasanakis George
Moore-McCormack Energy, Inc.
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