Method for preparing vinyl chloride and coproducing dichloroethylene and 1,1,2-trichloroethane by acetylene-dichloromethane coupled reaction

A technology of dichloromethane and dichloroethylene, applied in the field of vinyl chloride monomer preparation, can solve the problem of low conversion rate of vinyl chloride selectivity, and achieve the effects of avoiding pollution, easy operation and control, and low energy consumption

Active Publication Date: 2015-06-03
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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Problems solved by technology

[0004] Liu Huijuan of Sichuan University and others put forward the idea of ​​obtaining vinyl chloride through the coupling reaction between methane chlorides in the article "New Technology for Catalytic Coupling of Methane Chlorides to Synthesize Vinyl Chloride Monomers", and then obtained the feasibility of this reaction through thermodyn

Method used

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  • Method for preparing vinyl chloride and coproducing dichloroethylene and 1,1,2-trichloroethane by acetylene-dichloromethane coupled reaction

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preparation example Construction

[0035] Catalyst preparation:

[0036] 1.27g CUCl 2 2H 2 0 was dissolved in 13.73g of deionized water to make a solution, and 10g of HNO3 Activated carbon after treatment, make the activated carbon completely absorb the above solution, let it stand at room temperature for 10 hours, and then dry it at 100°C to get 10% CuCl 2 / AC Catalyst.

[0037] Other supported catalysts in the present invention can be prepared similarly to the above method.

Embodiment 1 to 12

[0039] The dichloromethane is transported to the gasifier by a metering pump for gasification. The temperature of the gasifier is 100°C. The gasified dichloromethane is mixed with acetylene and preheated by a preheater. The preheating temperature is the same as the reaction temperature. Adjust the dichloromethane metering pump and acetylene flowmeter so that acetylene and gasified dichloromethane are mixed in a certain molar ratio through a mixer and then passed into a fixed-bed reactor equipped with a catalyst to control the reaction volume space velocity and reaction temperature The reaction is carried out at a certain value, and the product after the reaction is analyzed by gas chromatography. Catalyst, reaction temperature, volume space velocity, acetylene / methylene chloride molar ratio that concrete use among the embodiment 1 to 12 refer to following table 1, and calculate acetylene conversion rate, methylene chloride conversion rate, vinyl chloride selectivity, Dichloroe...

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Abstract

The invention relates to a method for preparing vinyl chloride and coproducing dichloroethylene and 1,1,2-trichloroethane by acetylene-dichloromethane coupled reaction, which is characterized by comprising the following steps: mixing acetylene and dichloromethane, and simultaneously carrying out dichloromethane coupled reaction and acetylene hydrochlorination on the acetylene and dichloromethane in a catalyst-filled reactor under the action of the catalyst, wherein the mole ratio of the acetylene to the dichloromethane is 0.5-2.5, the reaction temperature is 200-400 DEG C, the volumetric space velocity of the acetylene-dichloromethane gas mixture is 10-500 h<-1>, and the dichloromethane coupled reaction generates dichloroethylene, 1,1,2-trichloroethane and chlorine hydride; and further carrying out acetylene hydrochlorination on the generated chlorine hydride and acetylene to generate vinyl chloride. The method can simultaneously coproduce the dichloroethylene, 1,1,2-trichloroethane and other high-added-value products while producing vinyl chloride, and the process is more economical and has wider industrialization prospects.

Description

technical field [0001] The present invention relates to a method for preparing vinyl chloride (i.e. monochlorethylene) to co-produce dichloroethylene (including 1,1-dichloroethylene, cis-1,2-dichloroethylene, trans-1,2-dichloroethylene) and The method for 1,1,2-trichloroethane belongs to the technical field of vinyl chloride monomer preparation. Background technique [0002] As one of the five general-purpose plastics, PVC plays an important role in national economic construction and is widely used in various industries such as automobiles, building materials, pipes, wires and cables, toys, and food packaging. In 2011, the apparent consumption of five general-purpose plastics in my country exceeded 50 million tons, of which PVC accounted for about 14 million tons. Due to the constraints of our country's resource structure, compared with the petroleum ethylene method, the traditional process of coal-calcium carbide-acetylene is more suitable for the development of the domest...

Claims

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Application Information

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IPC IPC(8): C07C21/06C07C21/073C07C21/08C07C19/05C07C17/08C07C17/269
Inventor 徐云鹏庞晓东刘广业刘中民李铭芝周军李世英
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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