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Vinyl chloride monomer composition

A technology of vinyl chloride monomer and composition, applied in the field of novel vinyl chloride monomer composition, can solve problems such as insufficient polymerization inhibition effect, and achieve the effect of high industrial value and stable storage

Inactive Publication Date: 2008-03-12
TOKUYAMA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in this method, the effect of inhibiting polymerization is not sufficient, and further improvement is required.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-

[0032] 1,2-dichloroethane is obtained by oxychlorination reaction, and the 1,2-dichloroethane is thermally decomposed to obtain crude vinyl chloride monomer. Distillation in the distillation tower and refining treatment are performed so that the total amount of 1,3-butadiene and vinyl acetylene becomes 12 mass ppm, and the content of other impurities becomes 1 mass ppm or less.

[0033] Low boiling point distillation column:

[0034] Tower top temperature -39~-34℃, pressure 0.65~0.70MPaG

[0035] Tower bottom temperature 65~70℃, pressure 0.70~0.75MPaG

[0036] High boiling point distillation column:

[0037] Tower top temperature 37~42℃, pressure 0.45~0.50MPaG

[0038] Tower bottom temperature 97~102℃, pressure 0.50~0.55MPaG

[0039] 100 g of the thus refined vinyl chloride monomer was filled as a liquid into a 150 ml SUS316 pressure vessel.

[0040] Next, a container filled with 0.9 ml of methyl chloride gas and a container filled with 1.1 ml of ethyl chloride gas were c...

Embodiment 2-

[0051] A vinyl chloride composition containing components other than vinyl chloride in the following amounts was prepared in the same manner as in Example 1 except that the amounts of methyl chloride and ethyl chloride mixed in the purified vinyl chloride monomer were changed.

[0052] Vinyl chloride composition:

[0053] Methyl chloride: 30 mass ppm

[0054] Ethyl chloride: 50 mass ppm

[0055] Total amount of 1,3-butadiene and vinyl acetylene: 12 ppm by mass

[0056] Other impurities: below 1ppm

[0057] For the vinyl chloride composition obtained above, the time until cloudiness was measured in the same manner as in Example 1 was 200 days or more. In addition, suspension polymerization was carried out at a temperature of 58° C. for 8 hours in the same manner as in Example 1. As a result, the average particle size was 150 μm, and neither reduction in particle size nor delay in polymerization time occurred.

[0058] The above experimental results are shown in Table 1.

Embodiment 3-

[0060] A vinyl chloride composition containing components other than vinyl chloride in the following amounts was prepared in the same manner as in Example 1 except that the amounts of methyl chloride and ethyl chloride mixed in the purified vinyl chloride monomer were changed.

[0061] Vinyl chloride composition:

[0062] Methyl chloride: 50 mass ppm

[0063] Ethyl chloride: 100 mass ppm

[0064] Total amount of 1,3-butadiene and vinyl acetylene: 12 ppm by mass

[0065] Other impurities: below 1ppm

[0066] For the vinyl chloride composition obtained above, the time until cloudiness was measured in the same manner as in Example 1 was 200 days or more. In addition, suspension polymerization was carried out at a temperature of 58° C. for 8 hours in the same manner as in Example 1. As a result, the average particle size was 150 μm, and neither reduction in particle size nor delay in polymerization time occurred.

[0067] The above experimental results are shown in Table 1.

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Abstract

A vinyl chloride monomer composition characterized in that the vinyl chloride monomer contains a chlorinated saturated hydrocarbon in a concentration of 45-200 ppm by mass. The vinyl chloride monomer composition has excellent polymerizability in polyvinyl chloride production. Furthermore, the composition is stably prevented from undergoing polymerization during storage and can be stably stored over long.

Description

technical field [0001] The present invention relates to a novel vinyl chloride monomer composition excellent in storage stability and polymerizability. Background technique [0002] Polyvinyl chloride resin has excellent weather resistance properties, and has been used in various applications (typically, piping materials). Vinyl chloride monomer, which is a raw material for producing such a polyvinyl chloride resin, is particularly liable to polymerize due to heat, moisture, and light, and thus must be adequately managed when stored in a tank or the like. [0003] Vinyl chloride monomer is generally produced by producing 1,2-dichloroethane by direct chlorination of ethylene or oxychlorination reaction using oxygen and hydrogen chloride, and thermally decomposing it (dehydrochlorination). In the vinyl chloride monomer thus produced (hereinafter sometimes referred to as crude vinyl chloride monomer), in addition to unreacted ethylene and 1,2-dichloroethane, it also contains v...

Claims

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Application Information

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IPC IPC(8): C07C21/06C07C17/42
CPCC07C21/06C07C17/42C07C17/392
Inventor 森胁正之正木忍桝田雅史
Owner TOKUYAMA CORP
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