Xylene disproportionation reaction product separation system based on thermal high-pressure separation process and separation method of the xylene disproportionation reaction product separation system

Abstract

The invention provides a xylene disproportionation reaction product separation system based on a thermal high-pressure separation process and a separation method of the xylene disproportionation reaction product separation system. The system comprises a disproportionation reaction system and a reaction product separation system, which are connected in sequence, wherein the reaction product separation system comprises a thermal high-pressure separation tank, a heat exchanger, an air cooler, a water cooler and a reaction product separation tank; a gas discharging hole of the thermal high-pressure separation tank is sequentially connected with the heat exchanger, the air cooler, the water cooler and a feeding hole of the reaction product separation tank; a liquid discharging hole of the reaction product separation tank is connected with the heat exchanger. According to the xylene disproportionation reaction product separation system, under the condition of basically not influencing the purity of circulating hydrogen and the yield of aromatic hydrocarbon, repeated cooling and heating processes of thermal high-pressure separation liquid are reduced; a heating load of a subsequent fractionation system is reduced; meanwhile, the flow of a gas phase of the thermal high-pressure separation tank is obviously reduced and a cooling load of the reaction product is extremely reduced; compared with the prior art, the cooling load is reduced by more than 30 percent, the heating load is reduced by more than 50 percent and an energy-saving effect is remarkable.

Description

technical field [0001] The invention belongs to the field of separation of p-xylene disproportionation reaction products, relates to a xylene disproportionation reaction product separation system and a separation method thereof, in particular to a xylene disproportionation reaction product separation system and a separation method based on a thermal high-resolution process. Background technique [0002] The p-xylene (PX) unit is one of the core raw material units in the chemical fiber industry. It is used to reform the C in gasoline 7 -C 9 Aromatics are used as raw materials to produce products such as benzene, p-xylene and o-xylene. Among them, the disproportionation reaction unit is represented by toluene and C 9 -C 10 Aromatic hydrocarbons are used as raw materials to generate benzene and C through disproportionation and transalkylation reactions 8 Aromatics. In the disproportionation reaction process, the temperature of the disproportionation reaction product leavin...

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Problems solved by technology

The temperature of the aromatics product obtained by the above process is about 40°C, and the subsequent fractionation process needs to raise the temperature of the aromatics product to a higher temperature (160-200°C). Such repeated cooling-heating process not only consumes a large amount of cooling load, It also increases the heating load of the subsequent fractionation process

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