Upgrading of heavy residues by distillation and supercritical water treatment
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United States of America Patent
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Feb 14, 2023
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app pub date -
Feb 15, 2022
filing date -
Feb 15, 2022
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Abstract
A method of upgrading an overflash stream from a vacuum distillation unit comprising the steps of separating the overflash stream from an atmospheric residue stream, the overflash stream comprises an overflash fraction having a T10% between 475 and 530° C. and a T90% between 600 and 700° C.; introducing the reactor feed to a supercritical reactor at a temperature between 380° C. and 500° C. and a pressure between 25 MPa and 30 MPa; maintaining upgrading reactions in the supercritical reactor to upgrade the overflash fraction such that a reactor effluent comprises upgraded hydrocarbons relative to the overflash fraction; reducing a temperature of a reactor effluent in a cooling device to produce a cooled stream; reducing a pressure of the cooled stream in a depressurizing device to produce a discharged stream; and separating the discharged stream in a gas-liquid separator to produce a liquid phase product.
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