Process and device for preparing arene through low carbon hydrocarbon aromatization

Abstract

The invention relates to a process for preparing arene through low carbon hydrocarbon aromatization. The process comprises the following steps: raw material dry gas enters a first delivery branch pipe and a second delivery branch pipe from a delivery main pipe and then enters a dry gas feed heat exchanger through the first delivery branch pipe to heat, the obtained gas enters a heater to further heat, when heated to 300+ / -50 DEG C, the gas enters an aromatization reactor to perform aromatization reaction; and the raw material dry gas enters the aromatization reactor through the second delivery branch pipe to perform aromatization reaction, the obtained gas enters the dry gas feed heat exchanger from the aromatization reactor to perform heat exchange with the raw material dry gas in the first delivery branch pipe so as to be cooled, then the gas is cooled further to the room temperature and performs gas-liquid separation to obtain fuel gas and liquid arene, and a part of fuel gas is sent back to the delivery main pipe to converge with the raw material dry gas, wherein the ethylene content of the gas obtained through the aromatization reaction is about 0.1%. Therefore, the reaction rate of ethylene is high, the yield of arene is high and the quality of product is good.

Description

technical field [0001] The invention relates to a process and device for preparing aromatic hydrocarbons by aromatization of low-carbon hydrocarbons, belonging to the technical field of chemical industry. Background technique [0002] At present, there are various preparation methods and equipment for aromatization of dry gas, usually using an aromatization reactor. The system currently used by the applicant for aromatization to produce aromatics mainly includes aromatization reactor 4, Heater 5, dry gas feed heat exchanger 6, aromatization water cooler 7, aromatization deep cooler 8, aromatization gas-liquid separator 9 and aromatics pump 10, use the specific aromatization process of the above equipment For: the dry gas that needs to be aromatized from the product separation part is divided into two strands: the first strand as the main line first enters the dry gas feed heat exchanger 6, and exchanges heat with the aromatized gas to increase the temperature, and then Ente...

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Problems solved by technology

[0005] The defects that still exist are: the internal temperature of the reactor cannot be controlled, and the internal temperature of the reactor is often overheated, and the highest temperature exceeds the upper limit of 700 °C, resulting in catalyst sintering. At the same time, due to the high temperature, the carbon on the surface of the catalyst is serious, and the overall operation time of the catalyst is short. Restricts the operation of the aromatization system

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