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Method for preparing 2,3,3,3-tetrafluoropropene

A technology of tetrafluoropropene and tetrachloropropene, which is applied in 2 fields, can solve the problem that the reaction cannot be completed in one step in a single reactor, and achieves the effects of mild reaction conditions, simple process, and energy and resource saving.

Inactive Publication Date: 2012-02-15
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] This patent uses a two-step process to complete the conversion from 1,1,2,3-tetrachloropropene to 2,3,3,3-tetrafluoropropene. The previous step is completed in the liquid phase, and the latter step can be performed in the gas phase or in the gas phase. The transformation can be completed in the liquid phase, and the two steps must use their respective single reactors. It is impossible to use a single reactor to complete the reaction in one step under the pure gas phase.

Method used

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  • Method for preparing 2,3,3,3-tetrafluoropropene
  • Method for preparing 2,3,3,3-tetrafluoropropene
  • Method for preparing 2,3,3,3-tetrafluoropropene

Examples

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Embodiment 1

[0034] Weigh a certain amount of Cr (NO 3 ) 3 ·9H 2 O, add water to Cr(NO 3 ) 3 ·9H 2 After O is dissolved, use (NH 4 ) 2 CO 3 Adjust the pH of the solution to 7-8, so that the dissolved chromium ions are converted into hydroxide precipitates, then centrifuged, suction filtered, and then the precipitates were dried at 120 °C overnight, and the dried substances were dried at 500 °C, N 2 calcined for 4h in the atmosphere to obtain Cr 2 O 3 The catalyst, after tableting, is charged into the reactor.

[0035] inner diameter In the nickel alloy single reactor, add 6ml of the above Cr 2 O 3 The catalyst was dewatered under a nitrogen atmosphere, and then fluorinated with hydrogen fluoride gas. The catalyst was equally divided into upper and lower sections, which were controlled by their respective reaction temperatures. The temperature of the catalyst in the upper section of the reactor was 300 °C, and the temperature of the catalyst in the lower section of the reactor...

Embodiment 2

[0037] The same operation as in Example 1 was performed, except that the reaction temperature of the catalyst in the upper stage of the reactor was changed to 200° C. The reaction results are shown in Table 1.

Embodiment 3

[0039] The same operation as in Example 1, the difference is that the reaction temperature of the catalyst in the upper stage of the reactor is changed to 250° C. The reaction results are shown in Table 1.

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Abstract

The invention discloses a method for preparing 2,3,3,3-tetrafluoropropene. The method comprises the following steps of: loading Cr2O3 catalyst in a reactor; introducing preheated hydrogen fluoride and 1,1,2,3-tetrafluoropropene gas into the reactor, and performing vapor phase catalytic fluorination to synthesize 2,3,3,3-tetrafluoropropene, wherein a molar ratio of the hydrogen fluoride to the 1,1,2,3-tetrafluoropropene is (10-99):1, the catalyst is equally divided into two sections, the upper-section catalyst in the reaction has the temperature of between 200 and 350DEG C, the lower-section catalyst has the temperature of between 350 and 450DEG C, the reaction velocity is 250-2,000h<-1>, and the reaction pressure is normal pressure; and introducing obtained effluent into a rectifying tower, and performing deacidification and rectification treatment on the 2,3,3,3-tetrafluoropropene to obtain the final product. The method has the advantages of mild reaction conditions, simple process, and optimum distribution of energy and resources.

Description

Technical field: [0001] The invention relates to a chemical preparation method, in particular to a preparation method of 2,3,3,3-tetrafluoropropene. technical background: [0002] With the phase-out of HCFCs, the third-generation fluorine-containing refrigerants, HFCs, have gradually entered the refrigerant market as a substitute for HCFCs. Although HFCs have zero ODP and no ozone-depleting effect, many HFCs have high GWP values. Currently 1,1,1,2-tetrafluoroethane (CF 3 CH 2 F, HFC-134a) is the only refrigerant in automotive air conditioners with zero ODP, GWP up to 1300, and CF 3 CH 2 The presence of CF in the F molecule 3 After dissociation in the atmosphere, it is easy to react with OH radicals or ozone to form trifluoroacetic acid, which is seriously harmful to the ecosystem. Regulations have stipulated the phase-out schedule of 1,1,1,2-tetrafluoroethane in automotive air-conditioning refrigerants, so it is urgent to develop a performance approaching or even excee...

Claims

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Application Information

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IPC IPC(8): C07C21/18C07C17/25
Inventor 罗孟飞彭小波谢冠群胡庚申
Owner ZHEJIANG NORMAL UNIVERSITY
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