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Co-production preparation method of 2-chloro-3,3,3-trifluoropropene and 2,3-dichloro-1,1-difluoro propylene

A technology of trifluoropropene and difluoropropene, which is applied in the field of chemical preparation, can solve problems such as inability to co-produce, and achieve the effect of reducing overfluorination and increasing selectivity

Inactive Publication Date: 2011-11-23
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is a better technique for the preparation of 2-chloro-3,3,3-trifluoropropene, but it cannot co-produce 2,3-dichloro-1,1-difluoropropene

Method used

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  • Co-production preparation method of 2-chloro-3,3,3-trifluoropropene and 2,3-dichloro-1,1-difluoro propylene
  • Co-production preparation method of 2-chloro-3,3,3-trifluoropropene and 2,3-dichloro-1,1-difluoro propylene
  • Co-production preparation method of 2-chloro-3,3,3-trifluoropropene and 2,3-dichloro-1,1-difluoro propylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026]According to the molar ratio of Al and Cr 1:1, weigh a certain amount of Al respectively 2 o 3 and Cr(NO 3 ) 3 9H 2 O, add water to dissolve Cr(NO 3 ) 3 9H 2 O, then add Al 2 o 3 Stir well, then use (NH 4 ) 2 CO 3 Adjust the pH of the solution to 7-8 to convert the dissolved chromium ions into hydroxide precipitates, then centrifuge, filter with suction, and dry the precipitate at 120°C overnight after suction filtration, and dry the dried material at 500°C, N 2 Calcined under atmosphere for 4h to get Cr 2 o 3 -Al 2 o 3 Catalyst, after tablet molding, is loaded into the reactor.

[0027] The inner diameter is 10mm nickel alloy reactor, add 3ml of the above Cr 2 o 3 -Al 2 o 3 Catalyst, remove water under nitrogen atmosphere, then use hydrogen fluoride gas to fluorinate, then use N 2 Diluted 1,1,2,3-tetrachloropropene mixture (5:1) at a space velocity of 500h -1 Pass it into the reactor, inert the catalyst at 400°C for 4 hours, pass the mixed gas of...

Embodiment 2

[0030] The same operation as in Example 1, except that the reaction temperature of hydrogen fluoride and 1,1,2,3-tetrachloropropene was changed to 150° C., and the reaction results are shown in Table 1.

Embodiment 3

[0032] The same operation as in Example 1, except that the reaction temperature of hydrogen fluoride and 1,1,2,3-tetrachloropropene was changed to 200° C., and the reaction results are shown in Table 1.

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Abstract

The invention discloses a co-production preparation method of 2-chloro-3,3,3-trifluoropropene and 2,3-dichloro-1,1-difluoro propylene, comprising the following steps: activating and dewatering a Cr2O3-Al2O3 catalyst; then fluoridising; performing inerting on a 1,1,2,3- tetrachloro propylene mixed gas diluted by inert gas; causing hydrogen fluoride and 1,1,2,3-tetrachloro propylene mixed gas to react under the action of fluoridised and inerted Cr2O3-Al2O3 catalyst to obtain 2-chloro-3,3,3-trifluoropropene and 2,3- dichloro-1,1-difluoro propylene after an effluent is introduced in a rectifying tower; and obtaining the product after deacidification and distillation processing. With the method, the 2-chloro-3,3,3-trifluoropropene and the 2,3-dichloro-1,1-difluoro propylene can be simultaneously obtained. After the reaction, the conversion rate of the 1,1,2,3-tetrachloro propylene is 99%.

Description

Technical field: [0001] The present invention relates to a chemical preparation method, in particular to a co-production preparation method of 2-chloro-3,3,3-trifluoropropene and 2,3-dichloro-1,1-difluoropropene. Background technique: [0002] 2-Chloro-3,3,3-trifluoropropene and 2,3-dichloro-1,1-difluoropropene are 2,3,3,3-tetrafluoropropene (HFC-1234yf, CF 3 CF=CH 2 ) important intermediates and raw materials in the synthesis process. 2,3,3,3-Tetrafluoropropene is a new third-generation refrigeration product, and its typical feature is that it has a low GWP value (its value is 4). For the current large-scale use of 1,1,1,2-tetrafluoropropene Ethane (HFC-134a, CF 3 CH 2 F) Automotive air-conditioning refrigerants are a potential and economical drop-in replacement. According to the European Union's "Mobile Air-Conditioning Directive", the European Union will no longer use HFC-134a in all new cars from 2011; the United States will phase out HFC-134a refrigerants in cars f...

Claims

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Application Information

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IPC IPC(8): C07C21/18C07C17/20
Inventor 罗孟飞彭小波谢冠群鲁继青贾文志
Owner ZHEJIANG NORMAL UNIVERSITY
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