A kind of production technology of trans-1,2-dichloroethylene

Abstract

The invention relates to the field of preparation of trans-1,2-dichloroethylene, in particular to a production process of trans-1,2-dichloroethylene, which comprises the following steps: catalytic reaction of acetylene and chlorine under oxygen-free conditions, and the catalyst It is an alkaline earth metal chloride, and the reaction temperature is 80-150°C. The production process of trans-1,2-dichloroethylene provided by the present invention generates 1,2-dichloroethylene by selecting acetylene and chlorine to react under the action of an alkaline earth metal catalyst, the reaction is simple, and the source is wide and cheap, and the production cost It is relatively low, and there is no three-waste discharge at the same time, and it is safe to operate. It is a clean production process. Since the raw materials used are acetylene and chlorine, the atom economy is also high.

Description

technical field

[0001] The invention relates to the field of preparation of trans-1,2-dichloroethylene, in particular to a production process of trans-1,2-dichloroethylene. Background technique

[0002] Chlorinated olefins are used as organic solvents and low-temperature extraction agents due to their low toxicity, volatility and stable performance. Among them, chlorinated olefins such as trichloroethylene and tetrachloroethylene have been widely used in the past ten years However, in recent years, studies at home and abroad have shown that the extensive use of trichlorethylene and tetrachlorethylene will increase the global greenhouse effect, so it is of great practical significance to seek environmentally friendly alternatives to trichlorethylene and tetrachlorethylene.

[0003] Studies have shown that trans-1,2-dichloroethylene has similar properties to other halogenated hydrocarbons, and can be used as a solvent for paints, resins, rubber, and acetate fibers, as well as ...

Examples

Embodiment 1-10

[0029] Embodiment 1-10 relates to a production process of trans-1,2-dichloroethylene, specifically comprising the following steps:

[0030] S1: add barium chloride catalyst into 100ml tetrachloroethane solvent;

[0031] S2: heating the reaction system;

[0032] S3: Under the condition of condensing and refluxing, acetylene and chlorine gas are continuously passed into the solvent for 2 hours. See Table 1 for the feeding speed, catalyst consumption, reaction temperature and reaction pressure of each implemented acetylene and chlorine.

[0033] Table 1. The process operating conditions of each embodiment

[0034]

[0035]

Embodiment 14-15

[0037] Examples 14-15 relate to a production process of trans-1,2-dichloroethylene. The difference between Examples 14-15 and Example 4 is that the types of catalysts are different. The catalysts of each example are shown in Table 2.

[0038] Table 2. Catalyst types of each embodiment

[0039] Catalyst type Example 14 magnesium chloride Example 15 calcium chloride

Embodiment 16-17

[0041] Examples 16-17 relate to a production process of trans-1,2-dichloroethylene. The difference between Examples 16-17 and Example 4 lies in the types of organic solvents. See Table 3 for the organic solvents in each example.

[0042] Table 3. The organic solvent of each embodiment

[0043] Types of organic solvents Example 16 Pentachloroethane Example 17 Hexachloroethane

technical field

[0001] The invention relates to the field of preparation of trans-1,2-dichloroethylene, in particular to a production process of trans-1,2-dichloroethylene. Background technique

[0002] Chlorinated olefins are used as organic solvents and low-temperature extraction agents due to their low toxicity, volatility and stable performance. Among them, chlorinated olefins such as trichloroethylene and tetrachloroethylene have been widely used in the past ten years However, in recent years, studies at home and abroad have shown that the extensive use of trichlorethylene and tetrachlorethylene will increase the global greenhouse effect, so it is of great practical significance to seek environmentally friendly alternatives to trichlorethylene and tetrachlorethylene.

[0003] Studies have shown that trans-1,2-dichloroethylene has similar properties to other halogenated hydrocarbons, and can be used as a solvent for paints, resins, rubber, and acetate fibers, as well as ...

Examples

Embodiment 1-10

[0029] Embodiment 1-10 relates to a production process of trans-1,2-dichloroethylene, specifically comprising the following steps:

[0030] S1: add barium chloride catalyst into 100ml tetrachloroethane solvent;

[0031] S2: heating the reaction system;

[0032] S3: Under the condition of condensing and refluxing, acetylene and chlorine gas are continuously passed into the solvent for 2 hours. See Table 1 for the feeding speed, catalyst consumption, reaction temperature and reaction pressure of each implemented acetylene and chlorine.

[0033] Table 1. The process operating conditions of each embodiment

[0034]

[0035]

Embodiment 14-15

[0037] Examples 14-15 relate to a production process of trans-1,2-dichloroethylene. The difference between Examples 14-15 and Example 4 is that the types of catalysts are different. The catalysts of each example are shown in Table 2.

[0038] Table 2. Catalyst types of each embodiment

[0039] Catalyst type Example 14 magnesium chloride Example 15 calcium chloride

Embodiment 16-17

[0041] Examples 16-17 relate to a production process of trans-1,2-dichloroethylene. The difference between Examples 16-17 and Example 4 lies in the types of organic solvents. See Table 3 for the organic solvents in each example.

[0042] Table 3. The organic solvent of each embodiment

[0043] Types of organic solvents Example 16 Pentachloroethane Example 17 Hexachloroethane

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