Production device and process of aromatic hydrocarbon product

Abstract

The invention discloses a production device and process of an aromatic hydrocarbon product. 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 fractionating tower, a raffinate tower and a heat exchanger II; and the isomerization reaction unit comprises an isomerization membrane reactor, an isomerization product fractionating tower, a carclazyte tower, an isomerization reaction heating furnace, a heat exchanger III, a heat exchanger IV, a heat exchanger V and a compressor. The invention also provides a production process of the aromatic hydrocarbon product. According to the invention, the equipment investment is reduced, the operation load of the xylene tower is reduced, the fuel gas consumption of the xylene reboiler is saved, the phenomenon of unreasonable energy consumption of cooling and then heating materials is avoided, meanwhile, theheat exchange network is optimized, the fuel gas consumption of the isomerization reaction heating furnace is reduced, 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 process of aromatic hydrocarbon products. Background technique [0002] 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, 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; the raffinate is a p-xylene-poor material, and after the desorbent is separated by the raffinate tower, the equilibrium concentration is obtained through isomerization C 8 The aromatic mixture is then recycled back to the xylenes for fractionation. In this process, the rectification of th...

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Problems solved by technology

In this process, the rectification of the extracted liquid is a double-tower process of the extracted liquid tower and the finished product tower, which consumes a lot of energy, and after the isomerization product is removed by the deheptanizer to remove light hydrocarbons below C7, Most of it is recycled back to the xylene tower, increasing the operating load of the xylene tower and increasing the fuel consumption of the xylene reboiler

At the same time, the isomerization product is completely cooled after exchanging heat with the feed, and reheated after the hydrogen is separated, which causes unreasonable energy utilization; the existence of hydrogen also reduces the heat exchange efficiency of the isomerization reaction inlet and outlet heat exchangers

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