C - Chemistry – Metallurgy – 10 – G
Patent
C - Chemistry, Metallurgy
10
G
196/86
C10G 67/00 (2006.01) C07C 15/08 (2006.01) C10G 59/02 (2006.01)
Patent
CA 1089389
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 fractionat- ing 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 aro- matic content. The reformed stream is then thermally hydrocracked, preferably in a system containing multiple reactors. The pro- cess 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 C9+ 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.
291331
Gowling Lafleur Henderson Llp
Moore Mccormack Energy Inc.
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