Method and device for purifying dry feed gas for preparing ethyl benzene

Abstract

The invention relates to the technical field of ethyl benzene preparation from dry gas, in particular to a method and device for purifying dry feed gas for preparing ethyl benzene. The method comprises the following steps: A) carrying out primary de-amination on dry feed gas in a water washing tower; wherein the temperature of the primary de-amination is 0-50 DEG C, and the pressure is 0.7-1.0 MPa; B) after primary de-amination, carrying out primary gas-liquid separation on the dry gas in a cyclone separator; C) after primary gas-liquid separation, carrying out secondary gas-liquid separationon the dry gas in a coalescer; D) after secondary gas-liquid separation, carrying out de-amination on the dry gas in an adsorption tower again; E) carrying out heavy component removal on the dry gas subjected to de-amination again in a propylene absorption tower; and F) subjecting the dry gas after heavy component removal to heat exchange, and carrying out hydrogenation acetylene removal reactionto obtain purified dry gas. The purification method can effectively purify dry feed gas, the purified dry feed gas enters an alkylation reactor, ammonia poisoning of a catalyst can be avoided, carbondeposition rate and side reaction can be inhibited, and long-term operation of an alkylation reaction device is facilitated.

Description

technical field [0001] The invention relates to the technical field of dry gas production of ethylbenzene, in particular to a method and device for purifying raw material dry gas for production of ethylbenzene. Background technique [0002] Usually FCC by-product dry gas contains ethylene with a volume fraction of 10% to 30%. Utilizing the dry gas-to-ethylbenzene technology in which the ethylene component in FCC dry gas reacts with benzene to produce ethylbenzene, low-value FCC dry gas resources are realized. The high value-added utilization can greatly improve the economic benefits of the refinery. [0003] With the increasing shortage of oil resources, some refineries are gradually increasing the proportion of inferior raw material processing, and the operating conditions of the equipment are also very harsh; at the same time, in order to improve the comprehensive utilization value of the light hydrocarbon resources of the whole plant, the refinery will carry out the light...

AI Technical Summary

Problems solved by technology

Patent CN110283035A discloses a process and equipment for deamination. An adsorption deamination tower is introduced in the original dry gas production of ethylbenzene process. short, it cannot ensure the stable operation of the whole device, and the adsorbent is replaced frequently; at the same time, there is no de-alkyne unit in this patent, which cannot remove alkynes and dienes and other impurities in the dry gas well, and Can not solve the problem of stable operation of the alkylation catalyst

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