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A kind of fluorination catalyst and preparation method thereof

A fluorination catalyst, fluorination technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. The problems of low activity and easy carbon deposition of the catalyst can achieve the effects of excellent by-product control effect, high catalytic activity, and increased specific surface area.

Active Publication Date: 2018-12-04
RUYUAN DONGYANG LIGHT FLUORIDE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although fluorination catalysts have made great progress after years of development, there are still problems that the catalyst is easy to deposit carbon and the catalyst life is short, resulting in an increase in by-products in the production process, requiring frequent shutdowns to regenerate the catalyst, which increases production costs. At the same time, the catalyst activity and Selectivity needs to be further improved
Especially in the preparation process of the refrigerant product R134a, the selectivity of the by-product R134 is too high, the catalyst activity is low and the problems such as easy carbon deposition are serious. It is urgent to develop a catalyst product with excellent performance and suitable for catalytic preparation of refrigerant R134a.

Method used

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  • A kind of fluorination catalyst and preparation method thereof
  • A kind of fluorination catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Weigh 50g CrCl 3 ·6H 2 O, 3.4g AlCl 3 , 0.44g InCl 3 , 1.01g NiCl 2 , 0.61g LaCl 3 Dissolve in 1000mL deionized water, mix the mixed salt solution and ammonia water until the solution pH = 11, filter and wash to obtain the sample, put the sample into an oven for 8 hours at 120°C, add 24g (NH 4 ) 2 CO 3 and transferred to the roaster, at N 2 Calcined at a high temperature of 330° C. for 4 hours in the atmosphere, and the chromium-based precursor was obtained after the roasting.

[0050] Weigh 1.37g MgCl 2 Dissolve in 100 mL deionized water, add the solution dropwise to the vacuum-treated chromium-based precursor, then evaporate the liquid in a water bath, then dry it in an oven at 110 °C for 8 h, and finally place it in a tube furnace under N 2 Calcined at 320° C. for 5 h under atmosphere, crushed and sieved the calcined sample, added graphite and mixed evenly, and pressed into tablets to obtain the catalyst precursor.

[0051] Then, the catalyst precursor was ...

Embodiment 2

[0054] Weigh 50g CrCl 3 ·6H 2 O, 4.53g AlCl 3 , 0.22g InCl 3 , 0.88g NiCl 2 , 0.41g LaCl 3 Dissolve in 1050mL deionized water, mix the mixed salt solution and ammonia water until the solution pH=10, filter and wash to obtain the sample, put the sample into an oven for 100°C and dry it for 10h, then add 32g NH 4 NO 3 and transferred to the roaster, at N 2 Calcined at a high temperature of 340° C. for 5 hours in the atmosphere, and the chromium-based precursor was obtained after the roasting.

[0055] Weigh 0.92g MnCl 2 Dissolve in 110 mL deionized water, add the solution dropwise to the vacuum-treated chromium-based precursor, then evaporate the liquid in a water bath, then dry it in an oven at 120 °C for 9 h, and finally place it in a tube furnace under N 2 Calcined at 350° C. for 4 h under the atmosphere, crushed and sieved the calcined sample, added graphite and mixed evenly, and pressed into tablets to obtain the catalyst precursor.

[0056] Then, the catalyst prec...

Embodiment 3

[0059] Weigh 50g CrCl 3 ·6H 2 O, 5.1g AlCl 3 , 0.55g InCl 3 , 0.76g NiCl 2 , 0.51g LaCl 3 Dissolve in 1100mL deionized water, mix the mixed salt solution and ammonia water until the pH of the solution is 12, filter and wash to obtain the sample, put the sample into an oven and dry it at 110°C for 7 hours, add 18.4g of ammonium tartrate and transfer it to a roasting furnace, in N 2 Calcined at a high temperature of 350° C. for 4 h in the atmosphere, and the chromium-based precursor was obtained after the roasting.

[0060] Weigh 1.01g YCl 4 Dissolve in 100 mL deionized water, add the solution dropwise to the vacuum-treated chromium-based precursor, then evaporate the liquid in a water bath, then dry it in an oven at 110 °C for 10 h, and finally place it in a tube furnace under N 2 Calcined at 330° C. for 3 h under the atmosphere, crushed and sieved the calcined samples, added graphite and mixed evenly, and pressed into tablets to obtain the catalyst precursor.

[0061] T...

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Abstract

The invention relates to a fluorination catalyst and a preparation method and an application thereof. The fluorination catalyst contains Cr, Al, In, Ni, La and metallic element X, wherein the metallicelement X is at least one selected from Co, Mg, Ce, Fe, Mn, Cu, Y and Ga; the mass ratio of Cr, Al, In, Ni, La and the metallic element X in the fluorination catalyst is (70-90):(5-10):(1-3.5):(2-4.5):(0.5-3):(3-5.5). A precursor of the fluorination catalyst is prepared with a coprecipitation method, and ammonium salt as a pore expanding agent is added during preparation. The prepared precursor of the fluorination catalyst has large specific surface area, good pore structure and high catalytic activity, the precursor after being fluorinated is particularly suitable for catalyzing preparationof R134a, a byproduct control effect is good, and the service life is long.

Description

technical field [0001] The invention relates to a fluorination catalyst and its preparation method and application, in particular to a catalyst for the gas-phase fluorination reaction of halogenated hydrocarbons and hydrogen fluoride, in particular to a catalyst for catalyzing the preparation of R134a and its preparation method. Background technique [0002] In the field of fluorine chemical industry, since the ozone depletion potential (ODP) of hydrofluorocarbons (HFCs) is 0, the global warming potential (GWP) is small, and the refrigeration performance is similar to that of chlorofluorocarbons (CFCs), it is an ideal choice for CFCs. Substitutes are widely used in large commercial refrigerants, blowing agents, fire extinguishing agents, etc. Gas-phase fluorine-chlorine exchange reaction is the key reaction for the selective synthesis of fluorine-containing compounds. It has been widely used in the industrial production process of hydrofluorocarbons because of its simplicity...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01J23/86B01J35/10C07C17/20C07C19/08
Inventor 李义涛张宏清唐火强孙明刚邓龙辉马鹏程
Owner RUYUAN DONGYANG LIGHT FLUORIDE CO LTD
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