Method for separating light dydrocarbon aromatization dry gas

Abstract

The invention relates to a method for separating light dydrocarbon aromatization dry gas, which belongs to the technical field of light dydrocarbon aromatization. The method is characterized by comprising a reaction liquid separation tank, an absorption column and an analytical column; reaction gas of the reaction liquid separation tank enters the bottom of the absorption column to absorb and separate condensable hydrocarbons further; the material flow at the bottom of the absorption column returns to the reaction liquid separation tank; gas on the top of the column passes through a primary gas-liquid separation tank, a hydrogenation reactor and a secondary gas-liquid separation tank and then enters a hydrogen manufacturing device; high-purity hydrogen is separated out from the top of thehydrogen manufacturing device, and alkane-rich dry gas is separated out from the bottom to enter a pyrolysis device; and a liquid phase of the reaction liquid separation tank enters the analytical column, and the gas of the top of the analytical column returns to the reaction liquid separation tank. Aiming at the defects in the prior art that the dry gas is only subjected to simple gas-liquid separation, the quality of the dry gas is poor, and the uncompleted and unreasonable factors exist in the aspect of reasonable utilization of the aromatization, the invention provides the method for separating the dry gas thoroughly and completely, so that the quality of the dry gas is high, and the components of the dry gas are divided into components containing high-purity hydrogen and CH4, C2+,C3,C4 and over C4 which do not contain alkene, and the dry gas is utilized reasonably and effectively and meets the requirement of peripheral resource environment of enterprises.

Description

technical field [0001] The invention belongs to the technical field of aromatization of light hydrocarbons, and in particular relates to a method for separating dry gas from aromatization of light hydrocarbons. Background technique [0002] At present, some foreign light hydrocarbon aromatization technologies have entered the stage of industrial application. Domestic research on the aromatization of light hydrocarbons has also made some progress. For example, the Research Institute of Petroleum Science (RIPP) investigated the aromatization reaction of propane on ZRP molecular sieves and silicon-modified ZRP molecular sieves. On the ZRP molecular sieve, the xylene isomers in the liquid product are basically in a thermodynamic equilibrium distribution, and the para-selectivity is poor; on the silicon-modified ZRP molecular sieve, with SiO 2 With the increase of the content, the coverage degree of the active center on the outer surface of the ZRP molecular sieve increases, and...

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Problems solved by technology

Can not produce high-purity national standard petroleum benzene and toluene

[0008] There are no reports of producing high-purity benzene in other places. Only one project in Xinjiang is under approval and has not been officially put into production.

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