Gasoline light fraction deep processing technology

Abstract

The invention discloses a gasoline light fraction deep processing technology which comprises the following steps: (1) a C5 separation procedure: sending normal C5 / C6 alkane to a depentanizer, and using tower bottom oil of the depentanizer as normal C6 alkane; (2) a hydrogenation debenzolization process: mixing normal C6 alkane with fresh hydrogen to form a hydrogenation raw material, feeding the hydrogenation raw material into a hydrofining reactor, carrying out an aromatic hydrocarbon saturation reaction, and carrying out hydrogen separation on a reactant discharged from the bottom of the hydrofining reactor to obtain a crude product n-hexane; (3) a rectification process: the crude product n-hexane enters a rectification tower, and a second liquid phase part generated by a second reflux tank at the tower top of the rectification tower becomes 99.5 wt% n-hexane; 98.5 wt% n-hexane is obtained from the tower side line of the rectifying tower, and tower bottom heavy oil of the rectifying tower is discharged out of the rectifying tower. By means of the process, n-hexane with two different concentration specifications of 98.5 wt% and 99.5 wt% can be produced, high-quality n-hexane products can be effectively produced by implementing the processing process, and refinery product distribution is optimized.

Description

technical field [0001] The invention relates to a deep processing technology of gasoline light distillate. Background technique [0002] Normal gasoline components include C5-C12 normal paraffins, isoparaffins, single-cycloparaffins and single-ring aromatics, etc. The light fraction of gasoline is mainly C5 and C6 normal and isomeric components. Existing gasoline light fraction units use continuous reforming unit head oil, continuous reforming unit pentane oil, and hydrocracking unit light naphtha as raw materials, and the components of various raw materials are mainly normal and isomeric C5 / C6 alkanes are separated by existing equipment to generate normal C5 / C6 alkanes and isomeric C5 / C6 alkanes. C5 / C6 isomerized oil is used as a blending component of clean gasoline, and normal C5 / C6 alkanes are used as raw materials for steam cracking to produce ethylene. [0003] At present, although the n-hexane market is generally in a situation of oversupply, high-quality n-hexane h...

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Problems solved by technology

[0003] At present, although the n-hexane market is generally in a situation of oversupply, high-quality n-hexane has a good application market. However, due to the high content of n-hexane above 97wt%, it is mainly coal-based n-hexane, but coal-based n-hexane contains alcohols, etc. Impurities, in some industries, these impurities are not allowed, especially in the food and pharmaceutical industry

Therefore, there is still a need for a large amount of high-quality petroleum to produce n-hexane, but in the existing petrochemical processing, n-hexane is mainly used as raw material for steam cracking to produce ethylene, and a large amount of n-hexane components have not been rationally utilized

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