Aluminum base catalyst for preparing vinyl fluoride from 1,1-difluoroethane, and preparation method and application thereof

A difluoroethane and catalyst technology, applied in the field of aluminum-based catalysts and its preparation, can solve the problems of complex catalyst preparation methods and unfavorable industrial scale-up

Active Publication Date: 2015-08-19
ZHEJIANG LANTIAN ENVIRONMENTAL PROTECTION HI TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method of the catalyst is complicated, which is not conducive to industrial scale-up

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] According to the molar ratio of Al to Y is 1:0.05, weigh 20.39g of γ-Al 2 o 3 and 7.66g of Y(NO 3 ) 3 ·6H 2 O, first set Y(NO 3 ) 3 ·6H 2 Dissolve O in a certain amount of water to make it fully dissolved, and then add γ-Al 2 o 3 , let it stand for 10 hours to fully impregnate it, then dry it at 105°C for 24 hours, and finally roast it at 600°C for 3 hours to obtain the catalyst precursor Y 2 o 3 / γ-Al 2 o 3 . The catalyst precursor was dried in situ with nitrogen at 200 °C for 6 h, and then passed through HF:N 2 It is a mixed gas of 1:10, fluorinated at 180°C for 4 hours, then heated up to 340°C at a rate of 1°C / min, and gradually increased the concentration of hydrogen fluoride, until the later stage was fed with pure hydrogen fluoride for 8 hours to obtain an aluminum-based catalyst.

[0029] The prepared aluminum-based catalyst is used in the gas-phase dehydrofluorination reaction of 1,1-difluoroethane, and the reaction temperature is controlled at 250-...

Embodiment 2

[0034] According to the molar ratio of Al:Y:Ni is 1:0.04:0.01, weigh 20.39g of γ-Al 2 o 3 , 6.13g of Y (NO 3 ) 3 ·6H 2 O, 1.16g of Ni(NO 3 ) 2 ·6H 2 O, first set Y(NO 3 ) 3 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 Dissolve O in a certain amount of water to fully dissolve the two, and then add γ-Al 2 o 3 , let it stand for 12 hours to make it fully impregnated, then dried at 110°C for 12 hours, and finally calcined at 800°C for 2 hours to obtain the catalyst precursor NiO-Y 2 o 3 / γ-Al 2 o 3 . The catalyst precursor was dried in situ with nitrogen at 300 °C for 4 h, and then passed through HF:N 2 It is a mixed gas of 1:10, fluorinated at 180°C for 4 hours, then heated up to 340°C at a rate of 1°C / min, and gradually increased the concentration of hydrogen fluoride, until the later stage was fed with pure hydrogen fluoride for 8 hours to obtain an aluminum-based catalyst.

[0035] The prepared aluminum-based catalyst was used in the gas-phase dehydrofluorination reaction of ...

Embodiment 3

[0039] According to the molar ratio of Al:Y:Ni:Co of 1:0.03:0.01:0.01, weigh 20.39g of γ-Al 2 o 3 , 4.60g of Y (NO 3 ) 3 ·6H 2 O, 1.16g of Ni(NO 3 ) 2 ·6H 2 O, 1.43g of Co(NO 3 ) 2 ·6H 2 O, first set Y(NO 3 ) 3 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 Dissolve O in a certain amount of water to fully dissolve the three, and then add γ-Al 2 o 3 , let stand for 6h to fully impregnate, then dry at 150°C for 10h, and finally roast at 500°C for 6h to obtain the catalyst precursor Co 3 o 4 -NiO-Y 2 o 3 / γ-Al 2 o 3 . The catalyst precursor was dried in situ with nitrogen at 400 °C for 2 h, and then passed through HF:N 2 It is a mixed gas of 1:10, fluorinated at 180°C for 4 hours, then heated up to 340°C at a rate of 1°C / min, and gradually increased the concentration of hydrogen fluoride, until the later stage was fed with pure hydrogen fluoride for 8 hours to obtain an aluminum-based catalyst.

[0040] The prepared aluminum-based catalyst was used in ...

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Abstract

The invention discloses an aluminum base catalyst for preparing vinyl fluoride through gas phase hydrogen fluoride removal of 1,1-difluoroethane. The catalyst contains a main active component aluminum and a modification component, and the modification component is one of or a combination containing two or three of lanthanum, yttrium, cerium, zirconium, zinc, magnesium, nickel, cobalt, iron, manganese, tin and bismuth. The aluminum base catalyst disclosed in the invention can substantially reduce the reaction temperature of the preparation of vinyl fluoride through gas phase hydrogen fluoride removal of 1,1-difluoroethane, and improves the conversion rate and the selectivity.

Description

technical field [0001] The invention relates to an aluminum-based catalyst, in particular to an aluminum-based catalyst for preparing vinyl fluoride from 1,1-difluoroethane and a preparation method thereof. Background technique [0002] Vinyl fluoride (VF) is an important fluorine-containing monomer, mainly used in the preparation of polyvinyl fluoride (PVF). PVF is the one with the lowest fluorine content and the smallest density among fluororesins. It has excellent chemical corrosion resistance, hydrophobicity, abrasion resistance, aging resistance and non-stickiness. It has been widely used in the protective layer of building materials, Encapsulation of aviation industry and solar cells, inner wall coating of packaging containers, anticorrosion of oil pipelines in oil fields, etc. [0003] The prior art discloses a variety of VF monomer preparation routes, among which the production technology using acetylene and HF as raw materials is relatively mature, but there are pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J23/83B01J23/745C07C21/18C07C17/25
Inventor 王术成张迪林胜达刘武灿
Owner ZHEJIANG LANTIAN ENVIRONMENTAL PROTECTION HI TECH
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