Production device and production method of p-xylene

Abstract

The invention discloses a production device and a production method of p-xylene. The production device comprises a xylene fractionation unit, an adsorption separation unit and an isomerization reaction unit; the adsorption separation unit comprises an adsorption separation tower, an extract tower, a raffinate tower, a heat exchanger II, a heat exchanger III, a finished product tower, a finished product tower reboiler I and a finished product tower reboiler II; and the isomerization reaction unit comprises an isomerization reaction rectifying 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 method of p-xylene. The fuel gas consumption of the xylene reboiling furnace is reduced, isomerization reaction and product separation are carried out at the same time, and coupling utilization of energy is achieved; and the device and the method reduce the consumption of fuel gas in an isomerization reaction heating furnace, improve the efficiency of removing olefin, carbonyl and other unsaturated hydrocarbons from isomerization products, solve the problems of frequent replacement of spent bleaching clay and environmental pollution, optimize a heat exchange network, greatly reduces energy consumption, and improve economic and social benefits.

Description

technical field [0001] The invention relates to a production device and a production method of p-xylene. Background technique [0002] C 8 Aromatics include o-xylene, p-xylene, m-xylene and ethylbenzene four isomers, among which p-xylene has the largest market, so the industry usually prefers to increase the specific C 8 The production of para-xylene from aromatics feedstock sources even maximizes it. Due to their similar chemical structure and physical properties and the same molecular weight, p-xylene-depleted C is generally depleted by isomerization 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. In industry, crystallization method and adsorption separation method are generally used, among which adsorption separation method is widely used. The raw...

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Problems solved by technology

[0003] Aiming at the deficiencies in the prior art, the object of the present invention is to provide a production device and production method of p-xylene. The present invention adjusts the trend of the logistics in the process by arranging a clapboard type reactive distillation column, and further optimizes the conversion process. The thermal network reduces the operating load of the xylene tower, saves the fuel gas consumption of the xylene reboiler, solves the problems of waste clay replacement and environmental pollution, and simultaneously performs the isomerization reaction and product separation to realize energy Coupling utilization, reducing the fuel gas consumption of the isomerization reaction heating furnace, greatly reducing energy consumption, and improving economic and social benefits

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