Method for producing hexane from aromatic hydrocarbon raffinate oil

Abstract

The invention relates to a method for producing hexane from aromatic hydrocarbon raffinate oil. The aromatic hydrocarbon raffinate F is passed through the first rectification tower and the second rectification tower in sequence, and isohexane-containing isohexane is obtained from the position above the top of the second rectification tower. , normal hexane, methylcyclopentane and benzene stream I, feed the following position to obtain the C7 and above component stream IV containing cyclohexane, the C6 component in the stream IV passes through the reverse isomerization reactor, and the reaction is obtained Methylcyclopentane is circulated back to the first rectification tower, and stream I is passed through a hydrogenation reactor to obtain stream II, and stream II is passed through an isomerization reactor to obtain stream III containing isohexane, n-hexane, and cyclohexane, and stream III is separated Isohexane, n-hexane, methylcyclopentane, cyclohexane are obtained, wherein methylcyclopentane is recycled to the isomerization reactor. The invention effectively solves the problems of low comprehensive utilization of the existing aromatic hydrocarbon raffinate oil, low yield of n-hexane, low yield of cyclohexane, single component of hexane and low added value of products, and can be applied in industrial continuous production.

Description

technical field [0001] The invention relates to a method for producing hexane from aromatic hydrocarbon raffinate oil, in particular to a method for producing n-hexane, isohexane and cyclohexane, which effectively improves the added value of aromatic hydrocarbon raffinate oil. Background technique [0002] In the process of naphtha cracking to produce ethylene, pyrolysis gasoline undergoes two-stage hydrogenation and aromatics extraction to produce a large amount of raffinate by-product. At present, raffinate is mainly used to produce solvent oil, and basically no value-added utilization is carried out. Some Return to the cracking furnace as a cracking raw material, but due to the high content of cycloalkane, the yield of olefins is low; and higher cyclopentane and methylcyclopentane are not suitable for use as reforming raw materials. C6 alkanes account for more than 40% of the raffinate oil, which contains a large amount of cycloalkanes including methylcyclopentane and cyc...

AI Technical Summary

Problems solved by technology

[0011] The problem to be solved by the present invention is low comprehensive utilization of existing aromatics raffinate, low yield of n-hexane, low yield of cyclohexane, single hexane component, and low added value of products. A new aromatics raffinate is proposed. A method for producing hexane from residual oil, which is used for producing hexane from aromatic hydrocarbon raffinate oil, especially when producing n-hexane, isohexane and cyclohexane, has the advantages of high comprehensive utilization of aromatic hydrocarbon raffinate oil, high normal hexane yield, and cyclohexane High hexane yield, various hexane components, high added value of products, etc.

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