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Method for recovering organic silicon monomer from silicone rubber wastes

A technology of silicone rubber and organosilicon, applied in the direction of silicon organic compounds, etc., can solve the problems of environmental pollution, waste of resources, etc., achieve the effect of less secondary pollutants, solve the problem of recycling, and recover products with high purity

Inactive Publication Date: 2015-06-10
NANTONG OERSTED SHOES
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Problems solved by technology

At present, there are more than 100 silicone rubber button manufacturing factories in Guangdong Province alone. The annual demand for silicone rubber raw materials is conservatively estimated to exceed 8,000 tons. A large number of scraps and waste products are discarded every year, which not only causes waste of resources, but also seriously pollutes surroundings

Method used

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  • Method for recovering organic silicon monomer from silicone rubber wastes

Examples

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Effect test

Embodiment 1

[0022] Put 100 kilograms of distilled water into a 200 liter mixing tank, then slowly dissolve 55 kilograms of potassium hydroxide into the distilled water, after dissolving, put 5 kilograms of sodium dodecylbenzenesulfonate surfactant, stir and mix to form Homogenize the solution, slowly drop into 10 kg of saturated iron chloride solution, stir at room temperature for 1.5 hours, take it out and pour it into a ball mill to grind to obtain a Fe composite catalyst for later use. Wash and cut 100 kilograms of silicone rubber waste into a size smaller than 2×2×2cm, add 8 kilograms of Fe composite catalyst, stir evenly before putting it directly into a multi-tubular reaction tank, and raise the temperature of the tank under normal pressure Carry out catalytic cracking. When the temperature reaches 350°C, cracking begins to occur. When the temperature rises to 400-450°C, a large amount of products are produced and condensed. The final temperature is 500-600°C. After 180 minutes of re...

Embodiment 2

[0025] Put 100 kilograms of distilled water into a 200 liter mixing tank, then slowly dissolve 55 kilograms of sodium hydroxide into the distilled water, after dissolving, put 5 kilograms of sodium dodecylbenzenesulfonate surfactant, stir and mix to form Uniform solution, slowly drop into 10 kg of copper chloride saturated solution, stir at room temperature for 2 hours, take it out and pour it into a ball mill to grind to prepare a Cu composite catalyst for future use. Wash and cut 100 kg of silicone rubber waste into a size smaller than 2×2×2cm, add 5 kg of Cu composite catalyst, stir evenly, and then put it directly into a multi-tubular reaction tank, and raise the temperature of the tank under normal pressure Carry out catalytic cracking. When the temperature reaches 350°C, cracking begins to occur. When the temperature rises to 400-450°C, a large amount of products are produced and condensed. The final temperature is 500-600°C. After 180 minutes of reaction, 60 kg of crude ...

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Abstract

The invention discloses a method for recovering an organic silicon monomer from silicone rubber waste. The method comprises the following steps: adding a composite catalyst into the silicone rubber waste in the atmosphere of normal-pressure air, and carrying out catalytic cracking reaction at the temperature of 350-640 DEG C to generate crude DMC (dimethylcyclosiloxane) oil; adding a water-soluble oxidizing agent into the crude DMC oil to remove allochromatic impurities; taking a part of oxidized crude DMC oil, adding a composite catalyst into the oxidized crude DMC oil, refluxing at normal pressure and the temperature of 120-210 DEG C for 5-7 hours to obtain reaction mother liquor, feeding the left oxidized crude DMC oil continuously with a pump, mixing the left oxidized crude DMC oil with the reaction mother liquor, and carrying out reaction at the temperature of 185-250 DEG C to obtain refined DMC oil; and rectifying the refined DMC oil and separating to obtain the organic silicon monomer. The process disclosed by the invention has the advantages of simple production procedure, good catalyst efficiency, high recovered product purity, continuous production and good economic benefit.

Description

technical field [0001] The invention relates to the comprehensive chemical utilization of silicon rubber waste products, in particular to a method for recovering organic silicon monomers by cracking silicon rubber waste products with a composite catalyst. Background technique [0002] Organosilicon chemicals, such as silicone rubber, silicone oil, etc., are increasingly used in the production industry. All industries such as construction, electronics, textiles, and aerospace need to use organosilicon chemicals. With the continuous development of the domestic construction industry and communication electronics industry, the demand has increased significantly. At present, there are more than 100 silicone rubber button manufacturing factories in Guangdong Province alone. The annual demand for silicone rubber raw materials is conservatively estimated to exceed 8,000 tons. A large number of scraps and waste products are discarded every year, which not only causes waste of resourc...

Claims

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Application Information

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IPC IPC(8): C07F7/08C07F7/21
Inventor 袁建新
Owner NANTONG OERSTED SHOES
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