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Method for production of p-xylene

A technology for para-xylene and xylene, applied in the field of para-xylene production, can solve the problems of many equipment, high energy consumption, long process, etc., so as to reduce energy consumption, reduce enterprise operating costs, reduce equipment investment and floor space Effect

Active Publication Date: 2016-01-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of the double-tower process is that the process is long and there are many equipments, and the C8 aromatics are repeatedly heated and cooled in the process, so the energy consumption is quite high

Method used

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  • Method for production of p-xylene

Examples

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specific Embodiment approach

[0015] A method for producing p-xylene. The raw material containing C8 aromatics mixture enters a rectification tower, and the C8 aromatics mixture is separated from the side line of the rectification tower. The top of the tower is light hydrocarbons below C7, and the bottom of the tower is heavy hydrocarbons above C9 and C8 aromatics mixture. To the adsorption separation unit, contact with the adsorbent and separate to obtain p-xylene, m-xylene or ethylbenzene stream, and the remaining C8 aromatics are sent to the isomerization unit. Under the action of the isomerization catalyst, the generated isomerized C8 aromatics are used as The feed is recycled back to the rectification column.

[0016] Preferably, the raw material containing C8 aromatics is a mixed hydrocarbon containing ethylbenzene, p-xylene, o-xylene and m-xylene. The light hydrocarbons below C7 refer to hydrocarbons such as aromatic hydrocarbons, alkanes or cycloalkanes with carbon atoms below 7; the heavy hydrocar...

Embodiment 1

[0039] Example 1 illustrates the operating parameters and energy consumption of the method for producing p-xylene provided by the present invention.

[0040] Attached figure 2 The device and process shown are adsorption separation to produce p-xylene, and a 600,000-ton / year p-xylene device is used. attached figure 2 The single rectification column process flow diagram of the production p-xylene provided by the present invention, with attached figure 1 The difference in the shown process flow is that a rectification column is used instead of the conventional two-tower process to purify the feed for the adsorption separation unit. The equipment used is shown in Table 1, and the operating parameters and energy consumption of the device are shown in Table 2.

Embodiment 2

[0042] Example 2 illustrates the operating parameters and energy consumption of the method for producing p-xylene provided by the present invention.

[0043] Attached image 3 The process shown is adsorption and separation to produce p-xylene, and a 600,000-ton / year p-xylene device is used. attached image 3 The process flow diagram of the dividing wall type rectifying tower for the production of p-xylene provided by the present invention, with attached figure 2 The process flow shown is different in that the appended image 3 The rectification tower 2 adopted is a dividing wall rectification tower. Light hydrocarbons below C7 are extracted from the top of the dividing wall rectification tower 2, heavy hydrocarbons above C9 are extracted from the bottom of the tower, and aromatic hydrocarbon mixtures of C8 are extracted from the side line of the dividing wall rectifying tower. The equipment used is shown in Table 1, and the operating parameters and energy consumption of t...

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PUM

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Abstract

A method for production of p-xylene comprises the steps: a raw material containing a C8 aromatic hydrocarbon mixture goes into a rectifying tower, the C8 aromatic hydrocarbon mixture is separated from the lateral line of the rectifying tower, light hydrocarbons having the carbon number of 7 or less are obtained at the tower top, and heavy hydrocarbons having the carbon number of 9 or more are obtained at the tower bottom; the C8 aromatic hydrocarbon mixture goes to an adsorption separation unit, and is subjected to contact separation with an adsorbent to obtain a p-xylene, or m-xylene or ethylbenzene material flow; the remaining C8 aromatic hydrocarbons go to an isomerization unit, and under the action of an isomerization catalyst, isomerized C8 aromatic hydrocarbons are generated and are used as feeding materials to circularly return to the rectifying tower. With adopting of the method for production of p-xylene, equipment investment and occupied land area can be reduced, energy consumption also can be reduced, business operation costs are reduced, and economic benefits and social benefits are improved.

Description

technical field [0001] The invention relates to a method for producing p-xylene, more specifically, a method for recovering and / or producing p-xylene using a C8 aromatic hydrocarbon mixture as a raw material. Background technique [0002] The C8 aromatic hydrocarbon mixture mainly includes ethylbenzene (EB), p-xylene (PX), o-xylene (OX) and m-xylene (MX), four isomers, which are important basic chemical raw materials. The difference in boiling point between these several components is very small. Ethylbenzene 136.2°C, p-xylene 138.4°C, m-xylene 139.1°C, o-xylene 144.4°C. Among them, o-xylene with the highest boiling point can be separated by rectification, which requires hundreds of theoretical plates and a larger reflux ratio. Ethylbenzene with the lowest boiling point can also be separated by rectification, but it is much more difficult. The melting point of each component of C8 aromatic hydrocarbons has a large difference: p-xylene is 13.3°C, o-xylene is -25.2°C, m-xyle...

Claims

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Application Information

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IPC IPC(8): C07C7/00C07C7/13C07C7/04C07C5/27C07C15/08C07C15/073
Inventor 李强王瑾邢波
Owner CHINA PETROLEUM & CHEM CORP
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