Extraction separation method of triphenyl fractions and crude benzene processing process

Abstract

The invention discloses an extraction separation method of triphenyl fractions and a crude benzene processing process, and relates to the technical field of petrochemical engineering. The extraction separation method of triphenyl fractions comprises the following steps of performing rectification separation on the triphenyl fractions; obtaining a benzene mixture on the tower top; obtaining mixed arene at the tower bottom; performing extraction rectification separation on the benzene mixture; obtaining non-aromatic hydrocarbon on the tower top of an extraction rectification tower; obtaining extraction rich liquid at the tower bottom of the extraction rectification tower; performing reduced pressure rectification separation on the extraction rich liquid to obtain a product benzene and barrenliquid solvents; conveying the barren liquid solvents to an extraction rectification tower, wherein in the extraction tower, the feeding temperature of the benzene mixture is 90 to 110 DEG C, and thefeeding temperature of the barren liquid is 115 to 130 DEG C. The crude benzene processing process comprises the step of performing extraction separation on the triphenyl fractions generated in the crude benzene hydrogenation process. The extraction separation method of the triphenyl fractions and the crude benzene processing process have the advantages that the extraction agent consumption is low; the production and operation stability of the device is high.

Description

technical field [0001] The invention relates to the field of petrochemical technology, and in particular to a method for extracting and separating tribenzene fractions and a crude benzene processing technology. Background technique [0002] In the extraction system of the crude benzene hydrogenation unit, the intermediate product hydrogenated oil BTXS component (triphenyl fraction) from the stable tower of the high-pressure hydrogenation system directly goes to the extractive distillation tower, and is separated through the top of the tower under the extraction of sulfolane non-aromatic. The rich liquid at the bottom of the extractive distillation tower is sent to the solvent recovery tower, and the aromatics are separated from the solvent by vacuum distillation. The aromatics are extracted from the top of the tower, and high-purity benzene and toluene are separated through the benzene tower, toluene tower, and xylene tower respectively. and mixed xylene, and the poor solve...

AI Technical Summary

Problems solved by technology

[0003] The existing extraction process exists, and the operating temperature of each tower of the extraction system is high, which is easy to aggravate the decomposition and deterioration of sulfolane, resulting in a reduction in the purity of sulfolane to about 85%, which seriously reduces the extraction effect, resulting in the content of methylcyclohexane in the main product pure benzene The problem of high (300PPm) and total sulfur content (10PPm) exceeding the standard

In addition, it is necessary to regularly inject a large amount of fresh sulfolane to improve its extraction effect, shorten the production and operation cycle, and affect the long-term stable operation of the device

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