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US 10,501,389 B1Granted
Process and system for the production of para-xylene and benzene from streams rich in C6 to C12+ aromatics
AssigneeSaudi Arabian Oil Company
InventorsQi Xu, Raed H. Abudawoud, Zhonglin Zhang
Life of this patent
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Abstract
Embodiments include processes and systems for maximizing the production of benzene and para-xylene from heavy reformate. Embodiments include a C9 dealkylation reactor, a transalkylation reactor, and a C10+ dealkylation reactor. The process and system for producing benzene and para-xylene may be configured to additionally produce alkanes in the presence of hydrogen or olefins in the absence of hydrogen. Embodiments may include an aromatic extraction unit to separate non-aromatics from aromatics.
Claims24
A method of forming para-xylene and benzene from a heavy reformate, the method comprising the steps of:
- providing a heavy reformate feed stream, wherein the heavy reformate feed stream comprises C6-12+ aromatics;
- reacting via dealkylation the heavy reformate feed stream to produce a C9 dealkylation product stream, wherein C9-12+ aromatics of the heavy reformate feed stream are selectively converted into C6-8+ aromatics, wherein the C9 dealkylation product stream comprises C6-8+ aromatics;
- receiving and splitting the C9 dealkylation product stream to produce a benzene product stream, a toluene product stream, and a C8+ aromatics product stream;
- receiving and splitting the C8+ aromatics product stream to produce a C8 aromatics product stream, a C9 aromatics product stream, and a C10+ aromatics product stream;
- separating the C8 aromatics product stream to produce a para-xylene stream and an ortho-/meta-xylene stream, wherein the ortho-/meta-xylene stream comprises ortho-xylene and meta-xylene;
- receiving and reacting via transalkylation the toluene product stream, the C9 aromatics product stream, and the ortho-/meta-xylene stream to produce a BTX product stream, wherein the BTX product stream comprises benzene, toluene, and mixed xylenes;
- and
- receiving and reacting via dealkylation the C10+ aromatics product stream to produce a C6-10 aromatics product stream.
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A heavy reformate processing system for forming para-xylene and benzene, the heavy reformate processing system comprising:
- a C9 dealkylation reactor, the C9 dealkylation reactor operable to receive a heavy reformate feed stream and to produce a C9 dealkylation product stream, wherein the heavy reformate feed stream comprises C6-12+ aromatics, wherein the C9 dealkylation reactor selectively dealkylates C9-12+ aromatics to C6-8+ aromatics, wherein the C9 dealkylation product stream comprises C6-8+ aromatics;
- a reformate splitter fluidly coupled downstream of the C9 dealkylation reactor, the reformate splitter operable to receive the C9 dealkylation product stream and to produce a benzene product stream, a toluene product stream, and a C8+ aromatics product stream;
- a xylene splitter fluidly coupled downstream of the reformate splitter, the xylene splitter operable to receive the C8+ aromatics product stream and to produce a C8 aromatics product stream, a C9 aromatics product stream, and a C10+ aromatics product stream;
- a para-xylene separator fluidly coupled downstream of the xylene splitter, the para-xylene separator operable to receive the C8 aromatics product stream and to produce a para-xylene stream and an ortho-/meta-xylene stream, wherein the ortho-/meta-xylene stream comprises ortho-xylene and meta-xylene;
- a transalkylation reactor fluidly coupled downstream of the reformate splitter, the xylene splitter, and the para-xylene separator, the transalkylation reactor operable to receive the toluene product stream, the C9 aromatics product stream, and the ortho-/meta-xylene stream, operable to produce a BTX product stream, wherein the BTX product stream comprises benzene, toluene, and mixed xylenes and is introduced into the reformate splitter, and operable to isomerize ortho-xylene and meta-xylene of the ortho-/meta-xylene stream to produce para-xylene;
- and
- a C10+ dealkylation reactor fluidly coupled downstream of the xylene splitter, the C10+ dealkylation reactor operable to receive the C10+ aromatics product stream and to produce a C6-10 aromatics product stream, wherein the C6-10 aromatics product stream is introduced into the reformate splitter.
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Dependencies are inferred from the claim text.