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US 2020/0048167 A1Published application
Process for the production of high purity para-xylene and high purity toluene
AssigneeUop LLC
InventorsJason T. Corradi, Ryan D. Miller
Life of this patent
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Abstract
A process for the production of high purity toluene and para-xylene is described. More specifically, the process involves the production of high purity toluene produced via a light-desorbent selective adsorption process for para-xylene production, such as light desorbent para-xylene extraction, without the need for dedicated solvent extraction or olefin removal from the toluene stream.
Claims20
A process for producing high purity toluene and para-xylene in a para-xylene complex comprising:
- separating an extract stream comprising para-xylene and toluene from an adsorbent chamber into an overhead stream comprising C6− compounds and a bottoms stream comprising para-xylene and toluene in a first para-xylene fractionation column;
- separating the bottoms stream from the first para-xylene fractionation column in a second para-xylene fractionation column into a sidedraw stream comprising high purity para-xylene, an overhead stream comprising toluene, and a bottoms stream comprising C9+ aromatics;
- recovering the sidedraw stream as a high purity para-xylene stream;
- and
- recovering at least a portion of the overhead stream from the second para-xylene fractionation column as a high purity toluene product stream.
2 more elements
A process for producing high purity toluene and para-xylene in a para-xylene complex, the process comprising:
- separating a bottoms stream comprising C8+ aromatics from a benzene/toluene fractionation column in a xylenes fractionation column into an overhead stream comprising mixed xylenes and a bottoms stream comprising C9+ aromatics;
- introducing the overhead stream from the xylenes fractionation column into an adsorbent chamber comprising a para-xylene selective adsorbent;
- separating a stream comprising ortho-xylene, meta-xylene, and low-purity toluene from the adsorbent chamber and a portion of a low-purity toluene stream from the benzene/toluene fractionation column in a raffinate column into a raffinate overhead stream comprising toluene and a raffinate bottom stream comprising ortho-xylene and meta-xylene;
- introducing the raffinate overhead stream into the adsorbent chamber;
- removing an extract stream comprising para-xylene and toluene from the adsorbent chamber;
- separating the extract stream into an overhead stream comprising C6− compounds and a bottoms stream comprising para-xylene and toluene in a first para-xylene fractionation column;
- separating the bottoms stream from the first para-xylene fractionation column in a second para-xylene fractionation column into a sidedraw stream comprising high purity para-xylene, an overhead stream comprising toluene, and a bottoms stream comprising C9+ aromatics;
- recovering the sidedraw stream as a high purity para-xylene stream;
- and
- recovering at least a portion of the overhead stream from the second para-xylene fractionation column as a high purity toluene product stream.
7 more elements
Dependencies are inferred from the claim text.