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Fluorination catalyst precursor and preparation method of fluorination catalyst

A technology of fluorination catalyst and precursor, which is applied in the field of preparation of fluorination catalyst precursor and fluorination catalyst, can solve the problems of catalyst carbonization and crystal sintering, activity decline, catalyst metal poisoning, etc., and achieves the effect of improving reaction activity

Active Publication Date: 2020-02-28
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • 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, add at least one of lignin, cellulose, lignosulfonate or starch into a chromium chloride solution with a concentration of 5%, and fully stir at a speed of 45r / min to obtain mixture. Then, the mixed solution is added to 6% ammonia water to obtain a mixed solution containing a macroporous carrier, 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 metal: chromium chloride, nano-carbon (2-50nm), soluble platinum salt or soluble palladium salt, polyacrylamide or triethanolamine with a mass fraction of 82-93%, 3 Mix -10%, 1-6%, 0.5-5% into pure water, stir and mix evenly, then add the above mixed solution containing macroporous carrier, adjust the speed to 30r / min, maintain aging for 15min, then filter , wash the filter cake to neutral.

[0034] 3. Catalyst molding: place the filter cake in step 2 in an oven under nitrogen a...

Embodiment 1

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

[0041] 2. Preparation of mesoporous carrier and loading of active metal: 91%, 4.5%, 2.7 % and 1.8% in 26L of pure water, stirred and mixed evenly, then added the above-mentioned mixed solution containing macroporous carrier, adjusted the speed to 30r / min, maintained aging for 15min, filtered, and washed the filter cake to neutral .

[0042] 3. Catalyst molding: place the filter cake in step 2 in an oven under a nitrogen atmosphere to heat and dry at 120°C for 12 hours, and put it into a roasting furnace after drying for H 2 Baking at 450°C for 8h under atmosphere. After the calcination is completed, pulverize and add a small amount of graphite for tablet...

Embodiment 2

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

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

[0046] 3. Catalyst molding: place the filter cake in step 2 in an oven under a nitrogen atmosphere to heat and dry at 120°C for 12 hours, and put it into a roasting furnace...

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Abstract

The invention provides a preparation method of a fluorination catalyst precursor. The method comprises the following steps: (1) carrying out first mixing treatment on a chromium chloride solution andammonia water, wherein the chromium chloride solution contains a polymer pore-forming agent; (2) allowing an aqueous solution containing nanocarbon and platinum salt or palladium salt and the mixed solution obtained in the step (1) to be subjected to second mixing treatment and filtering treatment so as to obtain a filter cake, and the aqueous solution further contains at least one of chromium chloride and a pore channel compound; and (3) baking the filter cake 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 is high in mesoporous proportion, firm in macroporous structure, high in catalytic activity, high in weather resistance and long in service life.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular, the 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 the synthesis method of trichlorethylene. First, the first step is the reaction of trichlorethylene and hydrogen fluoride to generate R133a, and then the reaction of R133a and hydrogen fluoride to generate R134a. During the storage process, the raw material trichlorethylene is prone to partial decomposition due to contact with metals such as magnesium and aluminum, making the raw material acidic. 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, wh...

Claims

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Application Information

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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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