Method for highly producing benzene from C6 alkane

Abstract

The invention discloses a method for highly producing benzene from C6 alkane. The method comprises the following steps: heating C6 alkane raw materials, and sequentially removing n-hexane by virtue ofan adsorber, and light and heavy components by virtue of an iso-hexane removal tower; hydrating and heating lateral line components of the iso-hexane removal tower and hydrogen raw materials, and introducing the lateral line components and the hydrogen raw materials into a reactor system for reaction; carrying out gas-liquid separation I on a reaction product, pressurizing a gas phase, carrying out gas-liquid separation II, introducing the gas phase into a desorber for desorption of n-hexane, and introducing the gas phase into a reaction system; introducing a liquid phase in the gas-liquid separation I into a depentanizer, introducing a material flow at the top and a liquid phase obtained in the gas-liquid separation II into a debutanizer, and leading a pentane component at the bottom ofthe debutanizer and iso-hexane and heavy components removed from the iso-hexane removal tower out as gasoline blending components; and introducing the material flow at the bottom of the depentanizer into an extraction tower, extracting benzene, introducing the material flow at the bottom of the extraction tower into a separation system, separating benzene, and circularly introducing the material flow at top into the reaction system. According to the method, the utilization rates of active components in C6 alkane are substantially increased, most water in the raw materials is removed, and the problems that light and heavy components are accumulated in the reaction system are solved.

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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