Production device and production process of p-xylene

Abstract

The invention discloses a production device and a production process of p-xylene. The production 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 operation load of the xylene tower is reduced, the fuel gas consumption of the xylene reboiling furnace is saved, the unreasonable energy consumption phenomenon that materials are cooled and then heated is avoided, the heat exchange network is optimized, the fuel gas consumption of the isomerization reaction heating furnace is reduced, the use of a gas-liquid separation tank and an air cooler is omitted, the efficiency of removing olefin, carbonyl and other unsaturated hydrocarbons from isomerization products is improved, and the problems of frequent replacement of spent bleaching clay and environmental pollution are solved.

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. [0003] The separation of p-xylene generally adopts crystallization method and adsorption separation method in industry, among which adsorption separation method is widely used. 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, ...

AI Technical Summary

Problems solved by technology

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a production device and a production process for p-xylene. The present invention reduces the operating load of the xylene tower, saves the fuel gas consumption of the xylene reboiler, and improves the isomerization reaction product. The removal efficiency of unsaturated hydrocarbons such as olefins and carbonyls solves the problems of waste clay replacement and environmental pollution, and optimizes the heat exchange network to improve the heat exchange efficiency of the isomerization reaction inlet and outlet heat exchangers and the isomerization reaction heating furnace Furnace inlet temperature, reducing the amount of fuel gas and supplementary hydrogen in the isomerization reaction heating furnace, greatly reducing energy consumption, reducing equipment investment and floor space, and improving economic and social benefits

Images