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Catalyst for preparing vinyl fluoride and 1,1-difluoroethane by using acetylene fluoride and preparation method for catalyst

A technology of fluorinated acetylene and difluoroethane, which is applied in the field of chemical catalysts and their preparation, can solve problems such as carbon deposition, impact on catalyst performance, and impact on catalyst life, and achieve good activity and selectivity.

Inactive Publication Date: 2012-10-03
ZHEJIANG NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This catalyst has high activity for fluorinated acetylene to produce VF and HFC-152a, but the total selectivity of VF and HFC-152a is not very high, about 97%, and carbon deposits are generated at the same time
This not only affects the performance of the catalyst, but also carbon deposits will affect the life of the catalyst

Method used

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  • Catalyst for preparing vinyl fluoride and 1,1-difluoroethane by using acetylene fluoride and preparation method for catalyst
  • Catalyst for preparing vinyl fluoride and 1,1-difluoroethane by using acetylene fluoride and preparation method for catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] ①According to Cr, the molar ratio of La is 0.1:1, Cr 2 o 3 and La 2 o 3 The mass percentage is 1%, weigh Cr(NO 3 ) 3 9H 2 O and La(NO 3 ) 3 ·6H 2 O, add an appropriate amount of distilled water to prepare a solution, and press γ-Al 2 o 3 The mass percentage is 99%, the γ-Al 2 o 3 Add to the above solution, stir evenly, and immerse at room temperature for 4 hours;

[0024] ②Finally, dry in an oven at 120°C for 12 hours, and then bake in an air atmosphere at 1100°C for 4 hours to obtain a powder;

[0025] ③ The obtained powder was pretreated by anhydrous HF at 450°C for 4 hours, and then passed through N 2 Until being cooled to room temperature to obtain the catalyst Cr of the present invention 2 o 3 -La 2 o 3 / AlF 3 -α-Al 2 o 3 . After the reaction, γ-Al 2 o 3 Converted to β-AlF after high temperature calcination and fluorination 3 , α-AlF 3 , α-Al 2 o 3 mixture. β-AlF 3 , α-AlF 3 , α-Al 2 o 3 The total molar amount of γ-Al is equal to 2 ...

Embodiment 2

[0028] ①According to Cr, the molar ratio of La is 0.5:1, Cr 2 o 3 and La 2 o 3 The mass percentage is 2%, weigh Cr(NO 3 ) 3 9H 2 O and La(NO 3 ) 3 ·6H 2 O, add an appropriate amount of distilled water to prepare a solution, and press γ-Al 2 o 3 The mass percentage is 98% will γ-Al 2 o 3 Add to the above solution, stir evenly, and immerse at room temperature for 4 hours;

[0029] ②Finally, dry in an oven at 120°C for 12 hours, and then bake in an air atmosphere at 1100°C for 4 hours to obtain a powder;

[0030] ③ The obtained powder was pretreated by anhydrous HF at 450°C for 5 hours, and then passed through N 2 Until being cooled to room temperature to obtain the catalyst Cr of the present invention 2 o 3 -La 2 o 3 / AlF 3 -α-Al 2 o 3 . After the reaction, γ-Al 2 o 3 Converted to β-AlF after high temperature roasting and fluorination 3 , α-AlF 3 , α-Al 2 o 3 mixture. β-AlF 3 , α-AlF 3 , α-Al 2 o 3 The total molar amount of γ-Al is equal to 2 o ...

Embodiment 3

[0033] ①According to Cr, the molar ratio of La is 1:1, Cr 2 o 3 and La 2 o 3 The mass percentage is 5%, weigh Cr(NO 3 ) 3 9H 2 O and La(NO 3 ) 3 ·6H 2 O, add an appropriate amount of distilled water to prepare a solution, and press γ-Al 2 o 3 The mass percentage is 95% will γ-Al 2 o 3 Add to the above solution, stir evenly, and immerse at room temperature for 4 hours;

[0034] ②Finally, dry in an oven at 120°C for 12 hours, and then bake in an air atmosphere at 1100°C for 4 hours to obtain a powder;

[0035] ③ The obtained powder was pretreated by anhydrous HF at 450°C for 6 hours, and then passed through N 2 Until being cooled to room temperature to obtain the catalyst Cr of the present invention 2 o 3 -La 2 o 3 / AlF 3 -α-Al 2 o 3 . After the reaction, γ-Al 2 o 3 Converted to β-AlF after high temperature roasting and fluorination 3 , α-AlF 3 , α-Al 2 o 3 mixture. β-AlF 3 , α-AlF 3 , α-Al 2 o 3 The total molar amount of γ-Al is equal to 2 o 3 ...

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PUM

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Abstract

The invention discloses a catalyst for preparing vinyl fluoride (VF) and 1,1-difluoroethane by using acetylene fluoride and a preparation method for the catalyst. The catalyst consists of a carrier and active ingredients, wherein the carrier is a mixture of beta-AlF3, alpha-AlF3 and alpha-Al2O3; the active ingredients Cr2O3 and La2O3 account for 1 to 5 mass percent of the catalyst; and Cr and La are simultaneously carried on the carrier. The method comprises the following steps of: preparing a mixed solution from soluble salts of chromium and lanthanum, adding into gamma-Al2O3, and soaking for 4 hours at room temperature; drying for 12 hours in an oven of 120 DEG C, and roasting for 4 hours in air atmosphere of 1,100 DEG C to obtain powder; and pre-treating the powder for 4 to 6 hours at the temperature of 450 DEG C through anhydrous hydrogen fluoride (HF), introducing N2 till cooling to room temperature, and thus obtaining the catalyst. The catalyst is low in cost, easy to prepare, high in activity and environment-friendly, and can improve the total selectivity of VF and hydrofluorocarbon 152a (HFC-152a).

Description

technical field [0001] The invention relates to a chemical catalyst and a preparation method thereof, in particular to a catalyst for preparing vinyl fluoride (VF) and 1,1-difluoroethane (HFC-152a) by fluorinating acetylene and a preparation method thereof. Background technique [0002] Vinyl fluoride (VF) is an important fluorine-containing monomer, which can be used in the production of polyvinyl fluoride (PVF) and fluorine-containing fine chemicals. Among them, PVF is an important decorative material. It has outstanding corrosion resistance and has excellent resistance to chemical and pesticide products such as various oils, alcohols, aldehydes, ketones, lipids, salts, alkalis, and dilute acids. Anti-corrosion performance, in addition, it has outstanding heat resistance, low temperature resistance, anti-humidity, anti-mold, anti-salt spray performance, in addition, its coating film has good flexibility and folding resistance, wear resistance, impact resistance; adhesion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/132C07C21/18C07C19/08C07C17/08
Inventor 罗孟飞程永香谢冠群周强王树华
Owner ZHEJIANG NORMAL UNIVERSITY
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