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Carbon nanotube mercury-free catalyst for acetylene hydrochlorination reaction

A technology of acetylene hydrochlorination and mercury catalyst, which is applied in the direction of physical/chemical process catalyst, organic compound/hydride/coordination complex catalyst, catalytic reaction, etc. It can solve the problems of mercury pollution and harm, and achieve environmental friendliness, The synthesis process is simple and the cost is low

Pending Publication Date: 2020-10-09
XINJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the pollution and harm of mercury in the mercury-free catalyst for acetylene hydrochlorination, the invention provides a supported carbon nanotube non-precious metal catalyst for acetylene hydrochlorination

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: A. Weigh 5 g of dried hydroxyl-containing multi-walled carbon nanotubes MWCNTs-OH, add it into the prepared nitric acid modification solution (the mass fraction of nitric acid is 1%~20%), and Ultrasonic-assisted dispersion was carried out in an environment of 35 °C, and then the mixed solution was magnetically stirred under certain conditions, washed until neutral, and dried for use. B. Weigh a certain mass of copper chloride (copper load is 25%), stir and dissolve in hydrochloric acid aqueous solution at room temperature, and fully impregnate the obtained solution on the carbon nanotubes modified in A to obtain a solid-liquid mixture , after drying, it is a nitric acid modified carbon nanotube-copper based catalyst.

[0013] Weigh 3.5 g of the catalyst prepared above and put it into a fixed-bed reactor (made of quartz glass). The reaction conditions are: the space velocity of the feed gas is 110 h -1 , the raw material gas ratio is V(HCl):V(C 2 h 2 ) = 1...

Embodiment 2

[0014] Example 2: A. Weigh 5 g of dried carboxyl-containing multi-walled carbon nanotubes MWCNTs-COOH, and add it into the prepared nitric acid-hydrochloric acid modification solution (the mass fraction of nitric acid and hydrochloric acid is 1%~20%), Ultrasonic-assisted dispersion was carried out in an environment of normal pressure and 35 °C, and then the mixed solution was magnetically stirred under certain conditions, washed until neutral, and dried for use. B. Weigh a certain mass of bismuth chloride (the load of bismuth is 20%), stir and dissolve it in aqueous hydrochloric acid solution at room temperature, and fully impregnate the obtained solution on the carbon nanotubes modified in A to obtain a solid-liquid mixture , after drying, it is a carbon nanotube-bismuth-based catalyst modified by mixed acid (nitric acid-hydrochloric acid).

[0015] Weigh 3.5 g of the catalyst prepared above and put it into a fixed-bed reactor (made of quartz glass). The reaction conditions ...

Embodiment 3

[0016] Example 3: A. Weigh 5 g of dried hydroxyl-containing multi-walled carbon nanotubes MWCNTs-OH, and add it into the prepared ethylenediamine modification solution (the mass fraction of ethylenediamine is 1%~20%), Ultrasonic-assisted dispersion is carried out in an environment of normal pressure and 35 °C, and then the mixed solution is refluxed under certain conditions, washed until neutral, and dried for use. B. Weigh a certain mass of bismuth chloride (the loading capacity of bismuth is 15%), stir and dissolve it in aqueous hydrochloric acid solution at room temperature, and then place the mixed solution and the modified carbon nanotube carrier in A in a certain proportion. In a hydrothermal kettle lined with polytetrafluoroethylene, react at 120 °C for 6 h, wash and dry to obtain ethylenediamine-modified carbon nanotube-bismuth-based catalyst.

[0017] Weigh 3.5 g of the catalyst prepared above and put it into a fixed-bed reactor (made of quartz glass). The reaction c...

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PUM

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Abstract

The invention relates to a supported non-noble metal catalyst capable of being used for acetylene hydrochlorination reaction. The catalyst comprises an active component and a carrier. The active component of the catalyst is non-noble metal with the loading capacity of 1%-30%, and the non-noble metal comprises one salt of elements such as copper, tin, bismuth, nickel, cobalt, zinc and the like andcomplexes of the salts; a carrier of the catalyst is a carbon nanotube material modified by one or more of inorganic acid base (hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, potassium hydroxide, ammonia water and the like) and organic acid base (adipic acid, tartaric acid, oxalic acid, citric acid, ethylamine, ethylenediamine, pyridine and the like) reagents, and comprises one ofmultiwalled carbon nanotubes containing polar groups such as hydroxyl, carboxyl and epoxy groups. The catalyst is prepared by one of a wet impregnation method, a one-pot method and the like. The catalyst has the advantages that the catalyst is environmentally friendly and simple in process, the acetylene conversion rate of the prepared catalyst can reach 75%, and the vinyl chloride selectivity can reach 95% or above.

Description

technical field [0001] The invention relates to the synthesis and application of a supported carbon nanotube non-noble metal catalyst that can be used in acetylene hydrochlorination, and belongs to the field of catalyst preparation technology and application in fine organic synthesis. Background technique [0002] Vinyl chloride monomer (VCM) is an irreplaceable and important raw material for the synthesis of polyvinyl chloride (PVC). At present, 80% of VCM in my country is produced by acetylene hydrochlorination. [0003] In the traditional process, the mercury catalyst is poisonous and easy to sublimate, which not only endangers the ecological environment, but also affects product quality, and mercury resources are in short supply. Therefore, it is particularly important to develop environmentally friendly, cost-effective and mercury-free catalysts. [0004] At present, research on mercury-free catalysts for acetylene hydrochlorination at home and abroad is mainly focuse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/10B01J27/122B01J31/02B01J31/26B01J37/02C07C17/08C07C21/06
CPCB01J31/0238B01J31/26B01J37/0207B01J27/122B01J27/10C07C17/08B01J2231/32C07C21/06
Inventor 王璐廉立臻闫海军刘金斗王吉德王丰武凤娟宋雯曹艳
Owner XINJIANG UNIVERSITY