Crude benzol hydrogenation refining process

Abstract

The invention disclosed a crude benzol hydrogenation refining process. The crude benzol hydrogenation refining process comprises a raw material predissociation unit, a hydrofining unit, a predistillation unit, an unit of extractive distillation, an aromatic hydrocarbon refining unit and a xylene distillation unit, wherein the hydrofining unit comprises a reaction part and a steady part. The reaction part adopts a three stage hydrogenation. The first stage hydrogenation is the pre hydrofining reaction, while the second stage and the third stage hydrogenation are the main hydrofining reactions. The extractive unit distillation comprises an extractive distillation tower, a stripping tower and a liquid-liquid separation tank. When benzene is produced through the crude benzol hydrogenation refining process, the aromatic compound has the advantages of small loss, high retention rate of arene and high quality products.

Description

technical field [0001] The invention relates to a crude benzene hydrogenation refining process. Background technique [0002] In recent years, with the continuous development of the national economy, the country's demand for coke has grown rapidly, resulting in a continuous increase in the output of coking crude benzene and other resource-based by-products. Since coking crude benzene contains some unsaturated hydrocarbons and sulfur-containing and nitrogen-containing organic compounds, such as linear alkane mercaptans, aryl mercaptans, thioethers, thiophenes, dibenzothiophenes, thioindenes, pyridines, etc., it cannot be directly used as organic It can be used as a raw material only after the above-mentioned impurities are removed. The traditional impurity removal method for coking crude benzene is pickling, although this method can partially remove sulfur-containing compounds (mainly thiophene) and other impurities in crude benzene. However, the loss of aromatic compounds ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a crude benzene hydrorefining process to solve the problems of large loss of aromatic compounds, low retention rate of aromatics, and poor quality of products