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US 10,308,567 B2Granted
Processes and systems for obtaining aromatics from catalytic cracking hydrocarbons
AssigneeGTC Technology US LLC
InventorsWeihua Jin, Zhongyi Ding, Mircea Cretoiu, Joseph C. Gentry, Mark Lockhart, Calambur Shyamkumar, Pinti Wang
Life of this patent
Estimating the term…
Abstract
Methods and processes for producing paraxylene from catalytic cracking hydrocarbons, particularly C4 and C5+ streams, are disclosed. Each of the processing steps may be tailored to the overall objective of high paraxylene yield from a relative inexpensive feedstock.
Claims20
A process for producing paraxylene from a C4 stream and a C5+ catalytic naphtha stream from catalytic cracking unit, said process comprising:
- a) separating, in a first separation section, a C5-C9 non-aromatics stream and a first C6-C10 aromatics stream from the C5+ catalytic naphtha stream;
- b) forming, in an aromatization section, a second C6-C10 aromatics stream from the C4 stream, the C5-C9 non-aromatics stream, and an olefin rich feedstock;
- c) removing, via an impurity removal section, impurities from the first and second C6-C10 aromatics streams to create a purified C6-C10 aromatics stream;
- d) providing a reformate and pygas feedstock to a second separation section;
- e) separating, in the second separation section, a C6-C7 stream, a first C8 stream, a C9-C10 stream, a C11+ stream, and non-aromatics from the C6-C7 stream and the first C8 stream from the purified C6-C10 aromatics streams and the reformate and pygas feedstock;
- f) feeding the C6-C7 stream and the C9-C10 stream into a xylene formation section to form a second C8 stream;
- and
- g) feeding the first and second C8 streams into a paraxylene production section to produce a high-purity paraxylene product, the paraxylene production section comprising a paraxylene recovery zone and a xylene isomerization zone;
- and
- wherein the second separation section comprises a distillation zone that includes a benzene column and a toluene column, and wherein the xylene formation section of step f) shares the benzene column and the toluene column of the second separation section.
7 more elements
A process for producing paraxylene from a C4 stream and a C5+ naphtha stream from catalytic cracking unit, said process comprising:
- a) separating a feed stream into C4+ and C5-C10+ streams;
- b) distilling a C5-C9 non-aromatics stream and a C6-C10 aromatics stream from the C5-C10+ stream;
- c) feeding the C4+ stream, the C5-C9 non-aromatics stream, and a feed stream rich in olefins into a reactor to form aromatics from the C4+ stream and the C5-C9 non-aromatics stream;
- d) feeding an output stream from the reactor and the C6-C10 aromatics stream to an impurity removal section to remove impurities from the output stream and the C6-C10 aromatics stream;
- e) providing a reformate and pygas feedstock to a separation section;
- f) feeding an output stream from the impurities removal section into the separation section to separate the output stream and the reformate and pygas feedstock into a C6-C7 stream, a first C8 stream, a C9-C10 stream, a C11+ stream, and non-aromatics from the C6-C7 stream and the first C8 stream;
- and
- g) feeding the C6-C7 and the C9-C10 stream into a xylene formation section to form a second C8 stream;
- and
- h) feeding the first and second C8 streams into a paraxylene production section to produce paraxylene, the paraxylene production section comprising a paraxylene recovery zone and a xylene isomerization zone;
- and
- wherein the separation section comprises a distillation zone that includes a benzene column and a toluene column, and wherein the xylene formation section of step g) shares the benzene column and the toluene column of the separation section.
9 more elements
Dependencies are inferred from the claim text.