Method for preparing vinyl chloride monomer by using methane chloride

A technology of vinyl chloride monomer and methane chloride, which is applied in chemical instruments and methods, preparation of halogenated hydrocarbons, chemical/physical processes, etc., and can solve problems such as low selectivity of vinyl chloride, many types of products, and harsh reaction conditions

Active Publication Date: 2015-04-22
YIBIN TIANYUAN GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the vinyl chloride monomer synthesis process of the ethylene method, the reaction temperature of the ethylene dichloride pyrolysis furnace is only 500-550 °C, while in the French patent FR2711649, methyl chloride and chlorine need to be reacted at a high temperature of 700-1300 °C. This will inevitably require higher corrosion resistance and high temperature tolerance of the reaction device, which will greatly increase the investment cost of the reaction device
[0032] (2) The synthesis route of vinyl chloride is less feasible
Yet, although this patent has carried out exhaustive theoretical analysis to the synthetic vinyl chloride of methyl chloride and dichloromethane, concrete embodiment is not provided
In fact, follow-up studies conducted by domestic researchers have shown that it is difficult to find a suitable catalyst that can convert methyl chloride and methylene chloride into vinyl chloride.
This shows that, at least so far, it is very difficult for the new synthesis process of vinyl chloride provided by this patent to change from theory to reality.
[0033] (3) The selectivity of vinyl chloride is low
Among all the technical routes, only the high-temperature pyrolysis route of methyl chloride and chlorine gas given by French patent FR2711649 can obtain a relatively high vinyl chloride selectivity of about 30%, but the reaction conditions of this route are harsh and there are many types of products. greatly reduces its economic viability
As for other vinyl chloride synthesis routes, the highest selectivity of vinyl chloride is only about 10%, which is basically of no practical value

Method used

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  • Method for preparing vinyl chloride monomer by using methane chloride
  • Method for preparing vinyl chloride monomer by using methane chloride
  • Method for preparing vinyl chloride monomer by using methane chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] Example 1: Preparation of vinyl chloride monomer by oxidative coupling reaction of methyl chloride alone

[0095] The catalyst is obtained by dissolving a certain mass of precursors of barium, tungsten and potassium in water, adding silicon-aluminum molecular sieves, stirring evenly, drying and roasting. Mix methyl chloride and oxygen at a molar ratio of 1:1, pass it into a reactor equipped with a catalyst, the reaction temperature is 600°C, the reaction pressure is normal pressure, the reaction effluent is cooled to room temperature, washed with water and alkali to remove hydrogen chloride, condensed Remove water, pressurize, cool and separate to obtain liquid vinyl chloride. The conversion rate of methyl chloride is about 50.0%, the selectivity of vinyl chloride is over 70.0%, and the selectivity of dichloromethane is 15.0%. Calculation shows that vinyl chloride yield is 35.0%.

Embodiment 2

[0096] Embodiment 2: Using the oxidative coupling reaction method of methyl chloride alone to prepare vinyl chloride monomer

[0097] The catalyst is prepared by dissolving a certain mass of precursors of cobalt, molybdenum and cerium in water, adding silica-alumina molecular sieves, mixing evenly, drying and roasting. Mix methyl chloride and oxygen at a molar ratio of 1:1, pass it into a reactor equipped with a catalyst, the reaction temperature is 600°C, the reaction pressure is normal pressure, the reaction effluent is cooled to room temperature, washed with water and alkali to remove hydrogen chloride, condensed Remove water, pressurize, cool and separate to obtain liquid vinyl chloride. The conversion rate of methyl chloride is about 60.0%, the selectivity of vinyl chloride is over 70.0%, and the selectivity of dichloromethane is 23.0%. Calculation shows that vinyl chloride yield is 42.0%.

Embodiment 3

[0098] Embodiment 3: Use dichloromethane hydrocoupling reaction method alone to prepare vinyl chloride monomer

[0099] Precursor compounds of cobalt, molybdenum, iron and potassium are made into a solution according to a certain ratio, and alumina is used as a carrier, impregnated by an incipient wetness impregnation method, and then dried and roasted to obtain a catalyst. Hydrogen and dichloromethane (gasified by heating) were mixed according to a molar ratio of 3:1, passed into the reactor filled with the above catalyst, and reacted at 450 °C and 1 atm. After the reaction effluent is treated by the subsequent cooling and separation system, products such as vinyl chloride, ethylene and methyl chloride are obtained, and the selectivities are 42.0%, 17.0%, and 25.0%, respectively. The methylene chloride conversion was about 46.0%. Calculation shows that vinyl chloride yield is 19.3%.

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Abstract

The invention discloses a method for preparing a vinyl chloride monomer by using methane chloride. The method comprises the following steps: by taking methyl chloride and methylene chloride as raw materials, performing oxidative coupling on the methyl chloride and oxygen; performing hydrogenation coupling on the methylene chloride and hydrogen; charging oxygen into the methyl chloride to have a methyl chloride oxidative coupling reaction in the presence of a catalyst which has methane oxidative coupling reaction activity; charging hydrogen into the methylene chloride to have a methylene chloride hydrogenation coupling reaction in the presence of a catalyst which has hydrogenation activity; taking byproduct methylene chloride generated in the methyl chloride oxidative coupling reaction as the raw material for the methylene chloride hydrogenation coupling reaction; taking the byproduct methyl chloride generated in the methylene chloride hydrogenation coupling reaction as the raw material for the methyl chloride oxidative coupling reaction. The method disclosed by the invention is used for preparing vinyl chloride by combined utilization of methyl chloride oxidative coupling and methylene chloride hydrogenation coupling, is higher in selectivity of the vinyl chloride in comparison with a method which adopts a simplex reaction, and has the advantage of increasing the utilization rate of the raw material methane chloride and the yield of the vinyl chloride monomer as far as possible.

Description

technical field [0001] The invention relates to a method for preparing vinyl chloride monomer, in particular to a method for preparing vinyl chloride monomer by using methane chloride as a raw material. Background technique [0002] Vinyl chloride (CH 2 CHCl) is an important monomer used in polymer chemical industry, and is widely used in the production of polyvinyl chloride (PVC) in industry. At present, the industrial production methods of vinyl chloride monomer mainly include ethylene method and acetylene method. [0003] The acetylene method uses acetylene as a raw material, under the action of a mercury catalyst (mercury chloride loaded on activated carbon), reacts with hydrogen chloride to synthesize vinyl chloride monomer, and the vinyl chloride monomer is polymerized into PVC. The process is simple, the conversion rate of acetylene is more than 98%, and the selectivity of vinyl chloride is more than 99%. It is the earliest PVC production method to achieve industria...

Claims

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Application Information

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IPC IPC(8): C07C21/06C07C17/269B01J23/30B01J23/882B01J23/883
Inventor 师海波罗云邓敏周杰徐慧远胡燕邹斯国杨丽
Owner YIBIN TIANYUAN GRP CO LTD
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