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Steam cracking recovery method of silicone rubber

A recovery method and silicone rubber technology, applied in the direction of silicon oxide, silicon dioxide, silicon organic compounds, etc., can solve the problems of low yield, high energy consumption, complex products, etc., and achieve high yield, low energy consumption, and process simple effect

Inactive Publication Date: 2014-03-12
杨晓林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thermal cracking product has higher purity, but requires high temperature, high energy consumption, and low yield, which is not desirable from an economic point of view
The acid-catalyzed cracking product is pure and the yield is high, but the acid is severely corrosive to the equipment and needs to be replaced regularly, resulting in high cost. At the same time, the acid will also cause environmental pollution
The yield of alkali-catalyzed cracking is low, the product is complicated, and the purification cost is increased

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Put 80 grams of the cleaned, air-dried and pulverized silicone rubber waste into a stainless steel tubular reactor, feed in steam at 325°C, keep the temperature of the reactor at 325°C, and react for 5 hours. Stop the reaction and weigh. The crude product of the organosiloxane mixed ring (DMC) weighed 7.7 grams, and the ash residue weighed 10.7 grams.

Embodiment 2

[0016] Put 80 grams of the cleaned, air-dried and pulverized silicone rubber waste into a stainless steel tubular reactor, feed in steam at 450°C, keep the temperature of the reactor at 450°C, and react for 5 hours. Stop the reaction and weigh. The crude product of organosiloxane mixed ring (DMC) weighs 28.8 grams, and the weight of ash residue is 36.8 grams.

Embodiment 3

[0018] Put 80 grams of the cleaned, air-dried and pulverized silicone rubber waste into a stainless steel tubular reactor, feed in steam at 560°C, keep the temperature of the reactor at 560°C, and react for 4 hours. Stop the reaction and weigh. The crude product of organosiloxane mixed ring (DMC) weighs 33.6 grams, and the ash residue weighs 43.6 grams.

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PUM

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Abstract

The invention relates to a method for recovering silicone rubber through steam cracking. The method comprises the following steps: carrying out degradation cracking of the silicone rubber by utilizing high temperature or superheated steam, and separating and purifying cracking products to obtain cyclic organosiloxane and silica. A proper catalyst can be added to accelerate the cracking process. The method has the advantages of high yield, low energy consumption, no generation of new wastes, economy and environmental protection.

Description

technical field [0001] The invention relates to a recovery method for cracking silicon rubber by steam, which belongs to the field of recovery and utilization of chemical materials. Background technique [0002] Silicone rubber is widely used in aerospace, electronic and electrical industries due to its excellent performance. The demand for conductive silicone buttons in the electronics industry alone is increasing by more than 35% per year. In the production process of silicone rubber products, a lot of scraps will be generated, and a lot of discarded silicone rubber products will be generated in the process of use. The accumulation of these wastes will not only pollute the environment, but also waste resources. [0003] The recycling methods of silicone rubber scraps and waste products mainly include physical crushing and use as fillers and pyrolysis to extract silicone rings for the preparation of silicone products. Among them, cracking methods include catalytic cracking...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F7/21C01B33/12
Inventor 杨晓林
Owner 杨晓林