Method for preparing purified petroleum benzine and concentrating thiofuran by cruden benzol

Abstract

A process for preparing high-purity benzene and concentrated thiophene from crude benzene features use of two-class extracting and rectification. Its advantages are simple process, low corrosion to equipment, low cost and high output rate.

Description

technical field [0001] The present invention relates to the deep processing and utilization of by-products (i.e. crude benzene) produced in the industrial production process of iron and steel enterprises and coking enterprises, in particular, to a kind of crude benzene as raw material, through pre-fractionation unit, two-stage extraction and rectification Process for unitary preparation of pure benzene and thiophene concentrates. Background technique [0002] Benzene is an important basic organic chemical raw material. The annual consumption of benzene as an intermediate in organic chemical and fine chemical raw materials in my country accounts for about 45%-50% of domestic benzene production. The domestic petroleum benzene raw material has been in short supply, and the price is relatively low. High, which makes coking benzene an important source of local fine chemical raw materials, and its demand is increasing year by year. [0003] Thiophene is a very expensive chemical r...

AI Technical Summary

Problems solved by technology

Although my country's coking industry is rich in thiophene resources, thiophene cannot be recovered due to the general use of pickling or hydrogenation processes in the processing process, resulting in a shortage of this raw material market. At present, it mainly relies on foreign imports, and the price is very expensive

[0004] The traditional sulfuric acid washing method to treat coking light benzene not only cannot guarantee product quality, but also causes serious corrosion of equipment during the refining process, produces a large amount of acid tar and regenerated acid that cannot be reused at present, and constitutes serious pollution to the environment. Benzene also has certain degree loss, the precious thiophene resource cannot be recovered

[0005] The traditional catalytic hydrogenation method has a large investment scale, harsh technical conditions, high catalyst production costs, and thiophene is completely destroyed during the hydrogenation process

In addition, this process is only suitable for processing large-tonnage coking benzene, and is not suitable for promotion in small and medium-sized enterprises

Therefore, a better method has not been found so far to prepare crude benzene into pure benzene and concentrated thiophene

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