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Fluorination catalyst precursor and preparation method of fluorination catalyst

A technology of fluorination catalyst and precursor is applied in the field of preparation of fluorination catalyst precursor and fluorination catalyst, and can solve the problems of activity decline, catalyst carbonization and crystal sintering, catalyst metal poisoning and the like

Active Publication Date: 2022-07-08
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the production of acidic trichlorethylene, it will corrode the pipelines, reaction furnaces and other equipment of the production unit, and produce a large amount of rust residue, which will cause metal poisoning of the catalyst on the production unit, resulting in a decrease in activity
In addition, due to the process of stacking and filling catalysts in a tubular fixed-bed reactor in production, stacking catalysts can easily lead to large differences in local reaction temperatures, which can easily cause catalyst carbonization and crystal sintering

Method used

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  • Fluorination catalyst precursor and preparation method of fluorination catalyst
  • Fluorination catalyst precursor and preparation method of fluorination catalyst
  • Fluorination catalyst precursor and preparation method of fluorination catalyst

Examples

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preparation example Construction

[0032] 1. Preparation of macroporous carrier: First, at least one of lignin, cellulose, lignosulfonate or starch is added to a 5% chromium chloride solution, and fully stirred at a speed of 45 r / min to obtain mixture. Then, the mixed solution is added to 6% ammonia water to obtain a mixed solution containing macroporous carriers, and the volume ratio of the chromium chloride solution to the ammonia water is 1:10-2:5.

[0033]2. Preparation of mesoporous carrier and loading of active metals: chromium chloride, nano-carbon (2-50nm), soluble platinum salt or soluble palladium salt, polyacrylamide or triethanolamine in a mass fraction of 82-93%, 3 Add -10%, 1-6%, 0.5-5% to pure water, stir and mix evenly, then add the above mixture containing macroporous carrier, adjust the speed to 30r / min, maintain aging for 15min, then filter , the filter cake was washed to neutrality.

[0034] 3. Catalyst molding: place the filter cake in step 2 in an oven under nitrogen atmosphere for 8-24 ...

Embodiment 1

[0040] 1. Preparation of macroporous carrier: First, 290 g of lignin was weighed into 3 L of 5% chromium chloride solution, and the mixture was fully stirred at a speed of 45 r / min. Then, the chromium chloride solution mixed with lignin was added to 11 L of ammonia water with a concentration of 6% to obtain a mixed solution containing a macroporous carrier.

[0041] 2. Preparation of mesoporous carrier and loading of active metals: Chromium chloride (1.4Kg), nano-carbon (2-50nm), ammonium tetrachloroplatinate, and polyacrylamide in mass fractions of 91%, 4.5%, 2.7% % and 1.8% were mixed into 26L of pure water, stirred and mixed evenly, then added the mixture containing the macroporous carrier, adjusted the rotation speed to 30r / min, maintained aging for 15min, filtered, and washed the filter cake to neutrality .

[0042] 3. Catalyst molding: place the filter cake in step 2 in an oven under a nitrogen atmosphere, heat it at 120 °C for 12 hours, and put it into a roaster after ...

Embodiment 2

[0044] 1. Preparation of macroporous carrier: First, 290 g of sodium lignosulfonate was weighed and added to 3 L of 5% chromium chloride solution, and the mixture was fully stirred at a speed of 45 r / min. Then, the chromium chloride solution mixed with sodium lignosulfonate was added to 11 L of ammonia water with a concentration of 6% to obtain a mixed solution containing a macroporous carrier.

[0045] 2. Preparation of mesoporous carrier and loading of active metals: Chromium chloride (1.4Kg), nano-carbon (2-50nm), ammonium hexachloroplatinate, and polyacrylamide were mixed with mass fractions of 91%, 4.5%, 2.7% , 1.8%, mixed into 26L of pure water, stirred and mixed evenly, then added the mixture containing the macroporous carrier, adjusted the rotation speed to 30r / min, maintained aging for 15min, filtered, and washed the filter cake to neutrality.

[0046] 3. Catalyst molding: place the filter cake in step 2 in an oven under a nitrogen atmosphere, heat it at 120 °C for 12...

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Abstract

The invention provides a preparation method of a fluorination catalyst precursor. The method comprises: (1) performing a first mixing treatment with a chromium chloride solution and ammonia water, wherein the chromium chloride solution contains a macromolecule pore-forming agent; (2) mixing an aqueous solution containing nano-carbon and platinum salt or palladium salt with The mixed solution obtained in step (1) is subjected to a second mixing treatment and a filtration treatment to obtain a filter cake, wherein the aqueous solution further contains at least one of chromium chloride and pore compounds; (3) the filter cake is A baking treatment is performed to obtain the fluorination catalyst precursor. Wherein, the polymer pore-forming agent is at least one of lignin, cellulose, lignosulfonate, and starch. The catalyst prepared by the method has high mesoporous ratio, firm macroporous structure, high catalytic activity, high weather resistance and long service life.

Description

technical field [0001] The present invention relates to the field of chemical industry, in particular, the present invention relates to a fluorination catalyst precursor and a preparation method of the fluorination catalyst. Background technique [0002] R134a, 1,1,1,2-tetrafluoroethane, is a medium and low temperature environmentally friendly refrigerant. At present, the technological route adopted in industry is trichloroethylene synthesis method. First, the first step is the reaction of trichloroethylene and hydrogen fluoride to form R133a, and then the reaction of R133a and hydrogen fluoride to form R134a. During the storage process, the raw material trichloroethylene is prone to partial decomposition due to contact with metals such as magnesium and aluminum, which makes the raw material acidic. In the production of acidic trichloroethylene, it will corrode the pipelines, reaction furnaces and other equipment of the production unit, and produce a large amount of rust s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/652B01J35/10B01J37/03B01J37/26B01J37/08C07C17/21C07C17/087C07C19/12C07C17/20C07C19/08
CPCB01J23/6522B01J37/0018B01J37/26B01J37/031B01J37/086C07C17/21C07C17/087C07C17/206B01J35/647B01J35/651B01J35/69C07C19/12C07C19/08Y02P20/584
Inventor 李义涛邓龙辉胡为晴张宏清孙明刚余航黄永锋唐火强
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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