A process for catalytic conversion of carbon tetrachloride

A carbon tetrachloride, catalytic conversion technology, applied in the chemical industry, can solve the problems of high oxygen consumption index, atmospheric ozone layer harm, long reaction time, etc., to achieve the effect of increasing the reaction rate, reducing the production cost, and improving the selectivity

Inactive Publication Date: 2014-10-01
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Carbon tetrachloride has a high oxygen consumption index and is very harmful to the atmospheric ozone layer. As early as 1996, the international community formulated the "Montreal Protocol", which stipulated that the sale and use of carbon tetrachloride should be completely banned before 2010. However, in the industrial production of methane chloride, carbon tetrachloride will be produced as a by-product.
But its disadvantage is: carbon tetrachloride is converted into HCl and CO in the reaction 2 , only use HCl and methanol to react to produce monochloromethane, while CO 2 is emitted without utilizing the carbon atoms in carbon tetrachloride
But its disadvantage is that the catalyst activity is low and the reaction time is long

Method used

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  • A process for catalytic conversion of carbon tetrachloride
  • A process for catalytic conversion of carbon tetrachloride
  • A process for catalytic conversion of carbon tetrachloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In a stainless steel autoclave, 0.3 g of self-made 12% AgCl / AC (AC is the abbreviation of activated carbon, the same below) catalyst was added, 5 ml of carbon tetrachloride, 23 ml of methanol, and 2 ml of 40% acetaldehyde were added. Close the reactor, replace the air in the reactor with nitrogen for three times, then feed nitrogen and maintain the pressure in the reactor, raise the temperature to 130°C, the reaction pressure is 4.0MPa, start stirring, react at constant temperature for 5 hours, and analyze the product with gas chromatography The results are shown in Table 1.

Embodiment 2

[0034] In a stainless steel autoclave, add 0.3 g of 8% Ag / AC catalyst, 5 ml of carbon tetrachloride, 15 ml of methanol, and 10 ml of hydrazine hydrate. Close the reactor, replace the air in the reactor with nitrogen for three times, then feed nitrogen and maintain the pressure in the reactor, raise the temperature to 200°C, the reaction pressure is 1.0MPa, start stirring, react at constant temperature for 5 hours, and analyze the product by gas chromatography The results are shown in Table 1.

Embodiment 3

[0036] In a stainless steel autoclave, add 0.3g of self-made 8%Ag-0.01%Pd / AC catalyst, add 5ml of carbon tetrachloride, 20ml of methanol, and 5ml of hydrazine hydrate. Close the reactor, replace the air in the reactor with nitrogen for three times, then feed nitrogen and maintain the pressure in the reactor, raise the temperature to 130°C, the reaction pressure is 1.0MPa, start stirring, react at constant temperature for 3 hours, and analyze the product by gas chromatography The results are shown in Table 1.

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Abstract

The invention discloses a catalytic conversion technology for carbon tetrachloride. The technology is implemented in an autoclave. The technology is characterized in that: a catalyst comprises Ag, AgCl or composition thereof serving as active ingredients; a catalyst carrier comprises silicon dioxide, titanium dioxide, active carbon or mesoporous carbon or composition thereof; and under the action of the catalyst, aids are added into a mixture of carbon tetrachloride and methanol, and a part of carbon tetrachloride is converted into dichloromethane. By the method, the conversion rate of carbon tetrachloride can be improved, the reaction time is shortened, and the selectivity of dichloromethane is improved.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a process method for in-situ liquid-phase catalytic conversion of carbon tetrachloride. Background technique [0002] Carbon tetrachloride has a high oxygen consumption index and is very harmful to the atmospheric ozone layer. As early as 1996, the international community formulated the "Montreal Protocol", which stipulated that the sale and use of carbon tetrachloride should be completely banned before 2010. However, in the industrial production of methane chloride, carbon tetrachloride will be produced as a by-product. Therefore, it is imperative to deal with carbon tetrachloride. With the development of technology, some methods of dealing with carbon tetrachloride have emerged, such as thermodynamic incineration, catalytic incineration and catalytic hydrogenation. Since the first two methods will produce secondary pollution, the catalytic hydrogenation method to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/23C07C19/03C07C19/04B01J23/50B01J23/89A62D3/34A62D101/22
Inventor 周秀莲鲁墨弘李明时单玉华朱建军
Owner CHANGZHOU UNIV
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