Production device and production method of p-xylene

Abstract

The invention discloses a production device and a production method of p-xylene. The 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 finished product tower, a finished product tower reboiler I, a finished product tower reboiler II, a heat exchanger II and a heat exchanger III; the isomerization reaction unit comprises an isomerization reactor, a hydrogenation reactor, an isomerization product fractionating tower, an isomerization reaction heating furnace, a heat exchanger IV, a heat exchanger V and a compressor. The invention also provides a p-xylene production process. The invention reduces equipment investment and floor area, reduces the operation load of a xylene tower, saves the fuel gas consumption of a xylene reboiling furnace and an isomerization reaction heating furnace, improves the efficiency of removing olefin, carbonyl and other unsaturated hydrocarbons from the isomerization product, solves the problems of frequent replacement of spent bleaching clay and environmental pollution, optimizes the heat exchange network, the energy consumption is greatly reduced, and the economic benefit and the social benefit are improved.

Description

technical field [0001] The invention relates to a production device and a production method of p-xylene. Background technique [0002] In industry, the adsorption separation method is generally used to obtain high-purity p-xylene products, and the raw material C 8 Aromatics include four isomers of o-xylene, p-xylene, m-xylene and ethylbenzene. Using the difference in selectivity of the adsorbent for the four isomers, the p-xylene-rich component and the depleted component are separated. Paraxylene component. The rich p-xylene is used as the feed of the extract liquid tower, and the components can be obtained through a series of rectification processes to obtain p-xylene products, and the lean p-xylene is used as the feed of the raffinate, and the components are converted into equilibrium concentration of C by isomerization reaction. 8 Aromatics mixture returns to the xylene tower for fractional distillation. In this process, the heat of the reboiler of the finished product...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies of the prior art, the present invention provides a p-xylene production device and production method, which reduces equipment investment and floor space, reduces the operating load of the xylene tower, and saves xylene reboiler and isomerization Reacting the amount of fuel gas in the heating furnace, improving the removal efficiency of unsaturated hydrocarbons such as olefins and carbonyls in the isomerization reaction products, solving the problems of waste clay replacement and environmental pollution, and optimizing the heat exchange network at the same time, greatly reducing energy consumption and improving economic efficiency benefit and social benefit

Images