Device and process for producing p-xylene

A technology for para-xylene and xylene, which is applied in the field of devices for producing para-xylene, can solve the problems of increasing the fuel consumption of the xylene reboiler, increasing the operating load of the xylene tower, unreasonable energy utilization, etc., and reducing energy consumption. energy consumption, improving economic and social benefits, and improving thermodynamic efficiency

Active Publication Date: 2020-03-31
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 xylen

Method used

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  • Device and process for producing p-xylene
  • Device and process for producing p-xylene
  • Device and process for producing p-xylene

Examples

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Embodiment 1

[0060] Embodiment 1 illustrates the method and energy consumption of the novel p-xylene production process provided by the present invention. The equipment used is shown in Table 1, and the operating parameters and energy consumption of the device are shown in Table 2.

[0061] Table 1

[0062]

[0063] Table 2

[0064]

[0065] As can be seen from Table 1 and Table 2, compared with Comparative Example 1, the method for producing p-xylene provided by the present invention can save equipment investment, each reducing 1 set of rectifying tower, cooler reboiler equipment and 1 gas Investment in liquid separation tanks, air coolers and water coolers. Adopting the method provided by the invention not only reduces the number of equipment, but also reduces energy consumption by 19.2%. Therefore, adopting the novel p-xylene production method provided by the present invention can reduce equipment investment and floor space, reduce the operating load of the xylene tower, and sa...

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Abstract

The invention discloses a device and a process for producing p-xylene. 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 reactor, an isomerization product fractionating tower, a white clay tower, an isomerization reaction heating furnace, a heat exchanger III, a heat exchanger IV, a heat exchanger V anda compressor. The invention also provides a process for producing p-xylene. According to the invention, with the device and the process, the equipment investment and the occupied area are reduced, theoperation load of the xylene tower is reduced, the fuel gas consumption of the xylene reboiler and the isomerization reaction heating furnace is saved, the heat exchange network is optimized, 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 device and a process for producing p-xylene. 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 their ...

Claims

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Application Information

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IPC IPC(8): C07C5/27C07C7/00C07C7/04C07C7/13C07C15/08
CPCC07C5/2708C07C5/2724C07C7/005C07C7/04C07C7/13C07C15/08Y02P20/10
Inventor 胡珺薄德臣高明张英
Owner CHINA PETROLEUM & CHEM CORP
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