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Process and device for producing p-xylene

A p-xylene and process technology, which is applied in the production process and equipment field of p-xylene, can solve the problems of poor separation effect and expensive equipment, and achieve the effects of high separation effect, lower recovery rate, and lower separation energy consumption

Pending Publication Date: 2022-05-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems in the prior art that the separation effect is not good, the recovery rate needs to be improved, the separation capacity is high, and the device used is expensive, the present invention provides a new process for producing p-xylene, which is used to produce p-xylene , which has the advantages of low separation energy consumption, high recovery rate and low device price

Method used

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  • Process and device for producing p-xylene
  • Process and device for producing p-xylene
  • Process and device for producing p-xylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] (1) A solid-liquid cyclone, such as Figure 2 to Figure 4 As shown, it includes a cyclone separator bottom flow pipe 111, a cone separation section 112, and a cylindrical separation section 114 connected in sequence from bottom to top. The cyclone inlet pipe 115 communicates with the cylindrical separation section 114, and the primary overflow The top of the pipe 116 communicates with the bottom of the secondary overflow pipe 117, and the primary overflow pipe 116 is arranged inside the cylindrical separation section 114, and the secondary overflow pipe 117 is arranged in the cylindrical separation section 114 outside; the helical inclined bottom plate 113 is also set inside the cyclone inlet pipe 115 and the cylindrical separation section 114;

[0090] Wherein, the material to be separated containing solid and liquid enters the solid-liquid cyclone from the cyclone inlet pipe 115, and enters the cylindrical separation section 114 from the oblique downward direction alo...

Embodiment 2

[0096] According to the solid-liquid cyclone, process and device for producing p-xylene in Example 1, the difference is that the helical angle of the helical inclined bottom plate 113 of the solid-liquid cyclone inside the cylindrical separation section 114 is 5°.

[0097] The purity of the obtained p-xylene product is 99.94%, and the recovery rate of p-xylene is 67.2%. Compared with the process of Comparative Example 1, the separation energy consumption is saved by 30%.

Embodiment 3

[0099] According to the solid-liquid cyclone, process and device for producing p-xylene in Embodiment 1, the difference is that the helical angle of the helical inclined bottom plate 113 of the solid-liquid cyclone inside the cylindrical separation section 114 is 45°.

[0100] The purity of the obtained p-xylene product is 99.85%, and the recovery rate of p-xylene is 64.5%. Compared with the process of Comparative Example 1, the separation energy consumption is saved by 12%.

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Abstract

The invention discloses a process and a device for producing p-xylene. The process comprises the following steps: a) performing cryogenic crystallization on a p-xylene-containing raw material I to obtain crystal slurry I; b) separating the crystal mush I through a solid-liquid cyclone I to obtain crystallization mother liquor I and crystal mush II, separating the crystal mush II to obtain crystallization mother liquor II and p-xylene crystals I, and feeding the p-xylene crystals I into a washing tank I; c) separating crystal mush III obtained after washing in the washing tank I to obtain p-xylene crystals II and crystallization mother liquor III, and enabling the p-xylene crystals II to enter a washing tank II; and d) separating the crystal mush IV obtained after washing in the washing tank II to obtain p-xylene crystals III and crystallization mother liquor IV, washing the p-xylene crystals III with a washing solution, feeding the washed p-xylene crystals III into a melting tank, and heating and melting the p-xylene crystals III to obtain a p-xylene product. The process and the device for producing p-xylene have the advantages of low separation energy consumption, high recovery rate and low device cost.

Description

technical field [0001] The invention relates to a process and device for producing p-xylene. Background technique [0002] Paraxylene (PX) is an important organic chemical raw material, mainly used to prepare purified terephthalic acid (PTA), and polyethylene terephthalate (PET) made from PTA is widely used in people's daily life in life. Separation of C8 aromatics is the main production method of p-xylene. At present, crystallization separation method and simulated moving bed adsorption separation method are mainly used in industry. [0003] US5448005 discloses a crystallization method for recovering p-xylene. In this method, a high-purity p-xylene product is first obtained through high-temperature crystallization, and then the remaining p-xylene is recovered through low-temperature crystallization. In this method, the p-xylene crystals obtained by low-temperature crystallization need to be completely melted and then used as feedstock for high-temperature crystallization,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/00C07C7/14C07C15/08
CPCC07C7/005C07C7/14C07C15/08
Inventor 陈亮郭艳姿张杰徐俊蔡立鑫
Owner CHINA PETROLEUM & CHEM CORP