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Catalyst used in HFC-245fa cracking and combined production of HFC-1234ze and HFC-1234yf, and preparation method thereof

A technology of hfc-1234yf and hfc-245fa, applied in the field of chemical catalyst and its preparation, can solve the problems of less than 20% conversion rate, large amount of HF, complicated catalyst preparation process, etc. The effect of stability

Active Publication Date: 2015-05-13
重庆信辰实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the catalyst Cr is used at the same time 2 o 3 -AlF 3 and Pd / AlF 3 / C, the catalyst is used to catalyze the fluorination of 1,1,2,3-tetrachloropropene, the reaction conditions are similar to the Chinese patent CN1852880A, the only difference is that the amount of HF involved in the reaction is relatively large, but the result shows that the second step reaction The conversion rate is less than 20%
The activity of the catalyst is relatively high, but the preparation process of the catalyst is relatively complicated. In addition, only HFC-1234ze can be obtained, and the purpose of co-production of HFC-1234ze and HFC-1234yf cannot be achieved

Method used

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  • Catalyst used in HFC-245fa cracking and combined production of HFC-1234ze and HFC-1234yf, and preparation method thereof
  • Catalyst used in HFC-245fa cracking and combined production of HFC-1234ze and HFC-1234yf, and preparation method thereof
  • Catalyst used in HFC-245fa cracking and combined production of HFC-1234ze and HFC-1234yf, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Preparation of Cr by precipitation method 2 o 3 :

[0025] ①CrCl 3 The solution is mixed with ammonia water to prepare Cr(OH) 3 Precipitated, filtered, dried under nitrogen at 120°C, and then calcined under nitrogen at 500°C for 4 hours to obtain Cr 2 o x (x=3.1);

[0026] ②Cr 2 o x Reduction under hydrogen atmosphere at 400°C for 1 hour yields Cr 2 o 3 ;

[0027] (2) Preparation of catalyst by mechanical mixing method:

[0028] ① Weigh Cr 2 o 3 , β-AlF 3 , Ni(OH) 2 、Ag 2 O, making Cr 2 o 3 and β-AlF 3 The molar ratio of substances is 9:1, Ni and Ag account for Cr respectively 2 o 3 and β-AlF 3 0.5% and 0.1% of the total mass, mechanically mixed, compressed into tablets;

[0029] ②Finally, it is roasted at 400°C under nitrogen atmosphere for 4 hours, and then reduced at 400°C under hydrogen atmosphere for 1 hour to obtain the Ni-Ag-Cr of the present invention.2 o 3 -AlF 3 mixture catalyst.

[0030] In a self-made stainless steel tube fixed-b...

Embodiment 2

[0032] (1) Preparation of Cr by precipitation method 2 o 3 :

[0033] ①CrCl 3 The solution is mixed with ammonia water to prepare Cr(OH) 3 Precipitated, filtered, dried under nitrogen at 120°C, and then calcined under nitrogen at 500°C for 4 hours to obtain Cr 2 o x (x=3.1);

[0034] ②Cr 2 o x Reduction under hydrogen atmosphere at 400°C for 1 hour yields Cr 2 o 3 ;

[0035] (2) Preparation of catalyst by mechanical mixing method:

[0036] ① Weigh Cr 2 o 3 , β-AlF 3 , Ni(OH) 2 、Ag 2 CO 3 , making Cr 2 o 3 and β-AlF 3 The molar ratio of substances is 3:7, Ni and Ag account for Cr respectively 2 o 3 and β-AlF 3 0.5% and 0.1% of the total mass, mechanically mixed, compressed into tablets;

[0037] ②Finally, it is roasted at 400°C under nitrogen atmosphere for 4 hours, and then reduced at 400°C under hydrogen atmosphere for 1 hour to obtain the Ni-Ag-Cr of the present invention. 2 o 3 -AlF 3 mixture catalyst.

[0038] In a self-made stainless steel tube ...

Embodiment 3

[0040] (1) Preparation of Cr by precipitation method 2 o 3 :

[0041] ①CrCl 3 The solution is mixed with ammonia water to prepare Cr(OH) 3 Precipitated, filtered, dried under nitrogen at 120°C, and then calcined under nitrogen at 500°C for 4 hours to obtain Cr 2 o x (x=3.1);

[0042] ②Cr 2 o x Reduction under hydrogen atmosphere at 400°C for 1 hour yields Cr 2 o 3 ;

[0043] (2) Preparation of catalyst by mechanical mixing method:

[0044] ① Weigh Cr 2 o 3 , β-AlF 3 、NiCO 3 、Ag 2 CO 3 , making Cr 2 o 3 and β-AlF 3 The molar ratio of substances is 5:5, Ni and Ag account for Cr respectively 2 o 3 and β-AlF 3 0.5% and 0.1% of the total mass, tablet molding;

[0045] ②Finally, it is roasted at 400°C under nitrogen atmosphere for 4 hours, and then reduced at 400°C under hydrogen atmosphere for 1 hour to obtain the Ni-Ag-Cr of the present invention. 2 o 3 -AlF 3 mixture catalyst.

[0046] In a self-made stainless steel tube fixed-bed reactor with an inner ...

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Abstract

The invention relates to a catalyst used in HFC-245fa cracking and combined production of HFC-1234ze and HFC-1234yf, and a preparation method thereof. The catalyst is a mixture of Ni-Ag-Cr2O3-AlF3. Active components are Cr2O3 and AlF3. Auxiliary components are Ni and Ag. A substance amount ratio of active components Cr2O3 to AlF3 is 9:1-3:7. The auxiliary components Ni and Ag respectively account for 0.5-5% and 0.1-0.5% of total masses of the active components Cr2O3 and AlF3. The preparation method is that: Cr2O3 is prepared with a precipitation method; Cr2O3, AlF3, Ni(OH)2 (or NiCO3), and Ag2O (or Ag2CO3) are subjected to mechanical mixing and tableting forming; the obtained material is subjected to roasting under a nitrogen atmosphere and reduction under a hydrogen atmosphere, such that the catalyst is obtained. The catalyst preparation process is simple, and the catalyst has high performance.

Description

technical field [0001] The invention relates to a chemical catalyst and a preparation method thereof, in particular to a catalyst for cracking HFC-245fa combined with HFC-1234ze and HFC-1234yf and a preparation method thereof. Background technique [0002] Both 1,3,3,3-tetrafluoropropene (HFC-1234ze for short) and 2,3,3,3-tetrafluoropropene (HFC-1234yf for short) have low greenhouse effect potential (GWP) and lifetime Climate performance (LCCP) index, zero ozone depletion potential (ODP), is considered as a new generation refrigerant to replace 1,1,1,2-tetrafluoroethane (HFC-134a). In addition, they are also used as blowing agents, solvents, propellants, fire extinguishers and dry etchants. [0003] At present, the route for preparing HFC-1234ze and HFC-1234yf is mainly the gas phase route, that is, the gas phase fluorination method and the gas phase cracking method are used to synthesize HFC-1234ze and HFC-1234yf, and the gas phase fluorination method is mainly to generate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/132C07C21/18C07C17/25
Inventor 罗孟飞王芳范镜莲赵洋王月娟鲁继青
Owner 重庆信辰实业有限公司
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