Device and process for producing aromatic hydrocarbon products

Abstract

The invention discloses a device and a process for producing aromatic hydrocarbon products. The device comprises a xylene fractionation unit, an adsorption separation unit and an isomerization reaction unit, wherein the adsorption separation unit comprises an adsorption separation tower, an extraction liquid fractionating tower, a raffinate tower and a heat exchanger II, and the isomerization reaction unit comprises an isomerization reaction rectifying tower, a white clay tower, an isomerization reaction heating furnace, a heat exchanger III, a heat exchanger IV, a heat exchanger VI and a compressor. The invention also provides a process for producing aromatic hydrocarbon products. With the device and the process of the invention, the equipment investment is reduced, the operation load ofthe xylene tower is reduced, the fuel gas consumption of the xylene reboiler is saved, the isomerization reaction and the product separation are carried out at the same time so as to achieve the coupling utilization of energy, the heat exchange network is optimized, the consumption of fuel gas of the isomerization reaction heating furnace is reduced, the energy consumption is greatly reduced, andthe economic benefit and the social benefit are improved.

Description

technical field [0001] The invention relates to a device and process for producing aromatic products. Background technique [0002] P-xylene is one of the important basic organic raw materials in the petrochemical industry. It is mainly used to produce terephthalic acid (PTA) and dimethyl terephthalate (DMT). It is widely used in chemical fibers, synthetic resins, pesticides, and medicines. , plastics and other production areas. In 2017, the apparent consumption of p-xylene in my country will reach 2400×10 4 t, the production capacity of p-xylene unit reaches 816×10 4 t, accounting for about 20% of global production capacity, my country is already the world's largest producer of p-xylene. [0003] 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...

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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

In addition, all isomerized products must be cooled. After the hydrogen gas that has not participated in the reaction is separated, the cooling load is relatively large; the material after the hydrogen gas is separated needs to be reheated, and it enters the deheptanizer for further separation. The material is cooled first and then heated. problem, resulting in a waste of energy

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