A kind of method of high-yield benzene of C6 alkane

Abstract

The invention discloses a method for high-yielding benzene from C6 alkane. The method is to remove normal hexane through an adsorber and remove light and heavy components through a deisohexane tower after heating the C6 alkane raw material; The side line components of the alkane tower and the hydrogen raw material are dehydrated and heated, and then enter the reactor system for reaction; the reaction product is subjected to gas-liquid separation I, and the obtained gas phase is pressurized to undergo gas-liquid separation II, and the gas phase part enters the desorber for desorption The n-hexane enters the reaction system; the liquid phase obtained from gas-liquid separation I enters the depentanizer, and the overhead stream enters the debutanizer together with the liquid phase obtained from gas-liquid separation II, and the bottom pentane component and deisohexane The isohexane and heavy components removed by the tower are taken out as gasoline blending components; the bottom stream of the depentanizer enters the extraction tower to extract benzene, and the bottom stream is sent to the separation system to separate benzene, and the top stream circulates into the reaction system ; The method greatly improves the utilization rate of active components in C6 alkanes, removes most of the water in the raw material, and solves the problem of accumulation of light and heavy components in the reaction system.

Description

technical field [0001] The present invention relates to a kind of method of cyclization of C6 alkane to produce benzene, more specifically, relate to a kind of through 5A molecular sieve adsorber to remove normal hexane and remove isohexane tower to separate low molecular light components and multi-branched chain hydrocarbons as The gasoline blending component enables reactive active paraffins to circulate, converts them into benzene in a maximum amount through hydrogenation, and improves the utilization rate of C6 paraffins, and belongs to the technical field of petrochemical industry. Background technique [0002] The target products of the catalytic reforming process are mainly high-octane gasoline components and aromatics, while by-product hydrogen. Currently used is a bifunctional catalyst, no matter it is platinum rhenium series or platinum tin series, the dehydrocyclization reaction performance of low-carbon paraffins (such as normal hexane, normal heptane) is all poo...

AI Technical Summary

Problems solved by technology

However, the addition of reformed raffinate to reformed raw materials leads to a decrease in the aromatization depth and octane number of reformed gasoline

Translated by Hu Yunlin (Catalytic aromatization of reformed raffinate, Catalytic Reforming Communication (1991) 4: 41-43) reported the catalytic aromatization of reformed raffinate, using reformed raffinate directly as raw material, Reforming was carried out with platinum-tin reforming catalysts, but the results showed that the aromatization of reformed raffinate containing C5-C7 hydrocarbons on traditional platinum-tin catalysts was very difficult and the selectivity was low

[0006] Combining the public information such as existing patents and papers, it is either related to the performance improvement of the platinum-supported basic L molecular sieve catalyst, or the refining of raw material desulfurization and dehydration to ensure the performance of the catalyst, or how to combine with the existing reformer to increase the performance of the catalyst. yield of aromatics, but none of them proposed a method for efficient utilization of unconverted alkanes, nor did they propose a method for solving the impact of heavy components produced during the reaction on catalyst stability

Therefore, the existing technology has not yet reached the ideal level, and there is still room for further improvement.

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