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Purification method for durene

A technology of durene and purification method, which is applied in the direction of crystallization purification/separation, organic chemistry, etc., can solve the problems of industrialized production scale and low output, achieve huge economic and social benefits, increase concentration, and simple operation Effect

Active Publication Date: 2014-01-22
TIANJIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the output of durene is relatively small at this stage, and the scale of industrial production has not yet been formed.

Method used

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  • Purification method for durene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The operation process is: 50% durene solution 4 enters the freezing crystallizer 1 for freezing and crystallization, the operating temperature is -15°C, the cooling medium of the freezing crystallizer uses frozen water, and after freezing and crystallization, durene crystals containing crystallization mother liquor are obtained 5; use the centrifuge separation device 2 to adopt a rotating speed of 600r / min to separate the crystallization mother liquor, obtain the crystallization mother liquor 7 and the solid product 6 after centrifugation, and use the squeezer 3 to squeeze the solid product for 30min to obtain the durene product 8 with a concentration of 60 %, and the squeezed crystallization mother liquor 9.

Embodiment 2

[0024] The operation process is as follows: 60% durene solution 4 enters the freezing crystallizer 1 for freezing and crystallization, the operating temperature is 0°C, the cooling medium of the freezing crystallizer uses chilled water, and after freezing and crystallization, durene crystals 5 containing crystallization mother liquor are obtained It is 1200r / min that the crystallization mother liquor is separated with the centrifugal separation device 2, and this process adds washing liquid gasoline accounting for 5% of the quality of durene in the raw material to obtain the crystallization mother liquor 7 and the centrifuged solid product 6, and the solid product is squeezed The machine 3 performs the squeezing operation for 120 minutes to obtain the durene product 8 with a concentration of 70%, and the squeezed crystallization mother liquor 9.

Embodiment 3

[0026] The operation process is as follows: 70% durene solution 4 enters the freezing crystallizer 1 for freezing and crystallization, the operating temperature is 20°C, the freezing water is used as the cooling medium of the freezing crystallizer, and after freezing and crystallizing, durene crystals 5 containing crystallization mother liquor are obtained It is 1800r / min to separate crystallization mother liquor with centrifuge separation device 2 adopting rotating speed, this process adds the washing liquid light diesel oil that accounts for 10% of durene quality in the raw material, obtains crystallization mother liquor 7 and centrifuged solid product 6, and this solid product adopts The squeezing machine 3 performs the squeezing operation for 180 minutes to obtain the durene product 8 with a concentration of 80% and the squeezed crystallization mother liquor 9 .

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Abstract

The invention relates to a purification method for durene. A durene solution (4) is added into a freezing crystallizer (1) for freezing crystallization, wherein a clod source is obtained through feed (11) of a cooling medium of the freezing crystallizer and discharge (12) of the cooling medium. After the freezing crystallization, durene crystals (5) containing crystallization mother liquor are obtained. The crystallization mother liquor is separated by a centrifugal separation device (2) to obtain crystallization mother liquor (7) and a solid product (6) after centrifugation. The solid product is squeezed by a squeezer (3) to obtain a durene product (8) and squeezed crystallization mother liquor (8) According to the purification method for the durene, the durene with a high concentration can be obtained, thus bringing great economic benefit and social benefit.

Description

technical field [0001] The invention relates to the field of durene preparation, in particular to a method for purifying durene in medium and low-concentration raw materials. Background technique [0002] Durene, that is, 1,2,4,5-tetramethylbenzene, camphor odor, white crystal, soluble in ether, ethanol and other organic solvents, insoluble in water, sublimation, in high temperature and nitric acid, vanadium pentoxide Catalytic oxidation generates pyromellitic anhydride. [0003] The main use of durene is to produce pyromellitic dianhydride. Pyromellitic dianhydride can be used to produce polyimide. As the market usage of polyimide continues to expand, the demand for durene is also increasing day by day. However, the output of durene is relatively small at this stage, and the scale of industrial production has not yet been formed. Therefore, it is necessary to develop reasonable and efficient production methods to reduce production costs. [0004] The present invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/02C07C7/14
Inventor 李鑫钢王磊李洪刘志云许长春段虹丛山李云石荣方姜华
Owner TIANJIN UNIV
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