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Method of producing vinylidene chloride and its device

A technology of vinylidene chloride and trichloroethane, which is applied in the synthesis process and device field of chlorinated unsaturated hydrocarbons, can solve the problems of many side reactions, safety threats of chloroacetylene, and low production capacity, and achieve stable product quality , The reaction conditions are easy to control and the effect of saving investment

Inactive Publication Date: 2006-11-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In China, NaOH is generally used for saponification in a stirred tank, resulting in low equipment production capacity, many side reactions, and easy generation of chloroacetylene, which poses a safety threat to production.

Method used

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  • Method of producing vinylidene chloride and its device
  • Method of producing vinylidene chloride and its device
  • Method of producing vinylidene chloride and its device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A device for producing vinylidene chloride (e.g. figure 1 (Shown), the device includes a storage tank II for providing 1,1,2-trichloroethane, a storage tank I1 for providing sodium hydroxide solution and a phase transfer catalyst, and a pipeline reactor 9 with a temperature control device 10. The temperature control device 10 uses water as the temperature control medium. In order to prevent the water from evaporating when the temperature is high, a small amount of silicone oil can be added to the water. The silicone oil floats on the water surface to form a thin layer, effectively controlling the large amount of water evaporation. The pipeline reactor 9 is placed in a temperature control device 10, and the temperature control device 10 is used to adjust the temperature in the pipeline reactor 9.

[0024] The storage tank I1 is connected to the static mixer 7 through a pipeline 5, and a metering pump 3 is provided on the pipeline 5. The storage tank II2 is connected to the s...

Embodiment 2

[0036] The production equipment of vinylidene chloride used was the same as in Example 1.

[0037] In the method for producing vinylidene chloride using the above-mentioned device, the specific process steps are as follows:

[0038] 1). Add 1,1,2-trichloroethane to storage tank II2.

[0039]2). Add NaOH solution with a weight concentration of 5% and 18-crown-6 as a catalyst in the storage tank I1.

[0040] 3) Turn on and adjust the metering pumps 4 and 3 so that the 1,1,2-trichloroethane in the storage tank II2 and the NaOH solution containing the catalyst in the storage tank I1 enter the static state at a volume feed ratio of 0.3:1 Mixer 7 is fully mixed to form a mixed material; at this time, the actual molar ratio of NaOH to 1,1,2-trichloroethane is 0.24:1. The weight of 18-crown-6 is 1,1,2-tri 0.3% by weight of ethyl chloride.

[0041] 4). The reaction temperature in the pipeline reactor 9 is maintained at 85°C; the residence time of the mixed material in the pipeline reactor ...

Embodiment 3

[0044] The vinylidene chloride production equipment used was the same as in Example 1.

[0045] In the method for producing vinylidene chloride using the above-mentioned device, the specific process steps are as follows:

[0046] 1). Add 1,1,2-trichloroethane to storage tank II2.

[0047] 2). Add 25% NaOH solution and tetra-n-butylammonium chloride as a catalyst in the storage tank I1,

[0048] 3) Turn on and adjust the metering pumps 4 and 3, so that the 1,1,2-trichloroethane in the storage tank II2 and the NaOH solution containing the catalyst in the storage tank I1 enter the static state at a volume feed ratio of 1:1 The mixer 7 is fully mixed to form a mixed material; at this time, the actual molar ratio of NaOH to 1,1,2-trichloroethane is 0.77:1. The weight of tetrabutylammonium bromide is 0.1% of the weight of 1,1,2-trichloroethane.

[0049] 4). The reaction temperature in the pipeline reactor 9 is maintained at 90°C; the residence time of the mixed material in the pipeline ...

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Abstract

A process for preparing meta-dichloroethene includes such steps as saponifying reaction between 1,1,2-trichloroethane and sodium hydroxide solution in tubular reactor at 80-90 deg.C for 37.7-42 S under the action of phase transfer catalyst, gas-liquid separation in flash distiller, and condensing the gas to obtain the target product. Its apparatus is also disclosed.

Description

Technical field [0001] The invention relates to a synthesis process and device of chlorinated unsaturated hydrocarbons, in particular to a production method and device of a polymerized monomer-vinylidene chloride. Background technique [0002] Vinylidene chloride has excellent properties such as good transparency, low air permeability, oil resistance, light resistance and non-flammability. Vinylidene chloride is an important polymerization monomer, and its polymers are widely used in the fields of fibers, modified resins, food packaging materials, plastics, rubber, coatings, adhesives, and fireproof materials. At present, the synthesis process of vinylidene chloride is mainly classified into the following categories according to the synthetic raw material and its treatment: [0003] 1. Vinyl chloride chlorination method. Using vinyl chloride as a raw material, 1,1,2-trichloroethane is obtained by addition with chlorine gas, and dehydrochlorination with NaOH is used to obtain viny...

Claims

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Application Information

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IPC IPC(8): C07C21/06C07C17/38C07C17/23
Inventor 陈新志苏叶华
Owner ZHEJIANG UNIV
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