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A kind of method for improving catalyst stability in hfc-23 resource utilization

An HFC-23 and catalyst technology, which is applied in the field of HFC-23 resource utilization, can solve the problems of low product selectivity and increased selectivity, and achieve the effects of improving selectivity, improving stability and reducing carbon deposition

Active Publication Date: 2022-06-28
ZHEJIANG RES INST OF CHEM IND CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, the selectivity of by-product CFC-12 is significantly increased, reaching 2% to 8%, and the product selectivity is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of catalyst: Chromium trioxide and cobalt trioxide powder are mixed by grinding, and the mass content of Co is controlled to be 1.0% to obtain 1.0% Co / Cr 2 O 3 catalyst precursor. For the 1.0%Co / Cr2 O 3 The catalyst precursor was subjected to two-stage fluorination treatment: 1) fluorination treatment at 250 °C for 2 hours under a mixed atmosphere of 10% hydrogen fluoride and 90% nitrogen; 2) fluorination treatment at 300 °C for 5 hours under hydrogen fluoride atmosphere. After the fluorination treatment, a catalyst was obtained, which was designated as catalyst 1.

[0034] HFC-23 resource utilization: trifluoromethane and chloroform were introduced into the reactor equipped with 50ml of catalyst 1 at 1:1.5 (molar ratio), and the reaction was carried out under the conditions of reaction temperature of 310°C, pressure of 1bar, and residence time of 5s. The conversion of trifluoromethane was 26.6%, the selectivity of HCFC-22 was 44.8%, the selectivity of HC...

Embodiment 2

[0036] Preparation of the catalyst: The chromium trioxide and the iron trioxide powder are mixed by grinding, and the mass content of Fe is controlled to be 1.0% to obtain 1.0% Fe / Cr 2 O 3 catalyst precursor. For the 1.0% Fe / Cr 2 O 3 The catalyst precursor was subjected to two-stage fluorination treatment: 1) under a mixed atmosphere of 10% hydrogen fluoride and 90% nitrogen, at 250 °C for 2 hours; 2) under a hydrogen fluoride atmosphere, at 300 °C for 5 hours. After the fluorination treatment, a catalyst was obtained, which was designated as catalyst 2.

[0037] HFC-23 resource utilization: trifluoromethane and chloroform were introduced into the reactor equipped with 50ml catalyst 2 at 1:1.5 (molar ratio), and the reaction was carried out under the conditions of reaction temperature of 310°C, pressure of 1bar and residence time of 5s. The conversion of trifluoromethane was 26.3%, the selectivity of HCFC-22 was 44.9%, the selectivity of HCFC-21 was 54.5%, the selectivity ...

Embodiment 3

[0039] Preparation of catalyst: Chromium trioxide and nickel trioxide powder are mixed by grinding, and the mass content of Ni is controlled to be 1.0% to obtain 1.0% Ni / Cr 2 O 3 catalyst precursor. For the 1.0%Ni / Cr 2 O 3 The catalyst precursor was subjected to two-stage fluorination treatment: 1) fluorination treatment at 250 °C for 2 hours under a mixed atmosphere of 10% hydrogen fluoride and 90% nitrogen; 2) fluorination treatment at 300 °C for 5 hours under hydrogen fluoride atmosphere. After the fluorination treatment, a catalyst is obtained, which is designated as catalyst 3.

[0040] HFC-23 resource utilization: trifluoromethane and chloroform were introduced into the reactor equipped with 50ml of catalyst 3 at 1:1.5 (molar ratio), and the reaction was carried out under the conditions of reaction temperature of 310°C, pressure of 1bar, and residence time of 5s. The conversion of trifluoromethane was 25.3%, the selectivity of HCFC-22 was 43.8%, the selectivity of HC...

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PUM

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Abstract

The invention discloses a method for improving the stability of a catalyst in resource utilization of HFC-23. The resource utilization adopts HFC-23 and halogenated hydrocarbons to carry out fluorine-chlorine exchange reaction, and the catalyst of the fluorine-chlorine exchange reaction includes a main body A catalyst and a metal oxide, the metal oxide is at least one metal oxide selected from K, Na, Fe, Co, Cu, Ni, Zn or Ti, and the added amount is 0.1-5 wt%. The invention has the advantages of good catalyst stability, long service life, low content of by-product CFC-12, and the like.

Description

technical field [0001] The invention relates to the resource utilization of HFC-23, in particular to a method for improving catalyst stability while suppressing the selectivity of by-product CFC-12 in the resource utilization of HFC-23. Background technique [0002] HFC-23 (CHF 3 , trifluoromethane, R23) is the industrial production of HFC-22 (HCFC-22, difluorochloromethane, R22 or CHClF 2 ) is an inevitable by-product with a strong greenhouse effect, and its Global Warming Potential (GWP, Global Warming Potential) is CO 2 14800 times. According to statistics, in 2013, my country's HFC-23 emissions accounted for 68% of the world's emissions, with an output of more than 20,000 tons, equivalent to CO 2 Annual emissions reached 296 million tons. Therefore, the resource utilization of HFC-23 is an important issue in realizing energy saving and emission reduction. [0003] At present, the by-product HFC-23 produced in the production process of HCFC-22 is generally treated by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/20C07C19/10B01J23/86B01J37/26B01J38/14
CPCC07C17/202B01J23/864B01J23/862B01J23/866B01J37/26B01J38/14C07C19/10B01J27/132B01J37/0018B01J37/0036B01J37/04Y02P20/584B01J23/94B01J38/04
Inventor 韩文锋王术成周飞翔刘武灿张建君李西良
Owner ZHEJIANG RES INST OF CHEM IND CO LTD
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