Production device and production process of p-xylene

Abstract

The invention discloses a production device and a production process of p-xylene. The device comprises a xylene fractionation unit, an adsorption separation unit and an isomerization reaction unit; and the isomerization reaction unit comprises an isomerization membrane reactor, an isomerization product fractionating tower, a hydrogenation reactor, an isomerization reaction heating furnace, a heat exchanger IV, a heat exchanger V and a compressor. The invention also provides a production process of p-xylene. The device and the process cancel the use of a gas-liquid separation tank and an air cooler, improve the efficiency of removing olefin, carbonyl and other unsaturated hydrocarbons from the isomerization product, solve the problems of frequent replacement of spent bleaching clay and environmental pollution, reduce the operation load of the xylene tower, save the fuel gas consumption of the xylene reboiling furnace, avoid the phenomenon of unreasonable energy consumption caused by firstly cooling and then heating materials, optimize a heat exchange network, and reduce the use amount of fuel gas of the isomerization reaction heating furnace.

Description

technical field [0001] The invention relates to a production device and a production process of p-xylene. Background technique [0002] C 8 Aromatics include four isomers of o-xylene, p-xylene, m-xylene and ethylbenzene. Due to their similar chemical structure and physical properties and the same molecular weight, p-xylene-poor C 8 Aromatics are converted to equilibrium concentrations of C 8 Aromatic mixture, and then obtain high-purity p-xylene products through technical means such as rectification and adsorption separation, depleted p-xylene C 8 Aromatics are re-isomerized in the system cycle. The raw material for adsorption separation is mixed C 8 Aromatics, utilizing the C 8 The selectivity of the four isomers of aromatic hydrocarbons is different, the p-xylene is preferentially adsorbed, and then the p-xylene on the adsorbent is desorbed with a desorbent. The extract is a p-xylene-rich material, and high-purity p-xylene products are obtained through rectification;...

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Problems solved by technology

[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a production device and production process for p-xylene, which reduces the operating load of the xylene tower, saves the fuel gas consumption of the xylene reboiler, and improves the isomerization rate. The removal efficiency of unsaturated hydrocarbons such as olefins and carbonyls in the reaction products solves the problems of waste clay replacement and environmental pollution. The furnace temperature of the heating furnace reduces the amount of fuel gas and supplementary hydrogen used in the isomerization reaction heating furnace, reduces equipment investment and floor space, and greatly reduces energy consumption

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