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Biological desulphurization process for waste and old rubber

A biological desulfurization and waste rubber technology, which is applied in the field of microbial desulfurization of waste rubber, can solve the problems that the desulfurization efficiency depends on the survival amount of sulfur-loving microorganisms, the desulfurization process is complicated, and the desulfurization effect is affected, achieving good physical and mechanical properties, and the desulfurization process is simple. The effect of simple and convenient cultivation process

Inactive Publication Date: 2008-10-22
BEIJING UNIV OF CHEM TECH
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The above-mentioned microbial desulfurization method mainly utilizes the "thiophilic" desulfurization of these special microorganisms. The main problem is that thiophilic microorganisms (such as sulfur oxidants and Thiobacillus ferrooxidans) require special cultivation, which takes a long time and costs a lot. , the desulfurization efficiency depends on the survival of sulfur-loving microorganisms, and many microorganisms are allergic to certain additives in rubber (such as aromatic compounds, etc.), which makes it difficult to survive in an environment containing rubber powder and affects the desulfurization effect. Therefore, it is necessary to treat waste rubber first Strict disinfection, complex desulfurization process and high cost

Method used

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  • Biological desulphurization process for waste and old rubber
  • Biological desulphurization process for waste and old rubber

Examples

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Effect test

Embodiment 1

[0020] Take 1.2g of hexadecyltrimethylammonium bromide in a 500ml three-necked flask, add 200ml of water, control the temperature of the water bath at 40°C, and set the stirring speed at 1300r / min to form hexadecyltrimethylammonium bromide Aqueous amine solution. Then, 100 ml of cyclohexane was added dropwise to the aqueous solution of cetyltrimethylammonium bromide, and stirred for 20 minutes to form an emulsion. Add 20 g of natural rubber powder prepared by a known sulfur vulcanization method into the prepared emulsion, start stirring, control the stirring speed at 300 r / min, and swell for 40 min. Then add 0.2g of glutathione into the rubber powder emulsion and react for 2h. Then suction filter, wash, and dry to obtain desulfurized rubber powder. The obtained desulfurized rubber powder is masticated on an open mill for 12 minutes. The sulfur content and oxygen content on the surface of the rubber powder in this example before and after desulfurization are shown in Table 1,...

Embodiment 2

[0025] Example 2: Take 0.2g of cetyltrimethylammonium bromide in a 500ml three-necked flask, dissolve it in 200ml of water under the condition of a water bath at 50°C, and dissolve 20ml of ring Hexane was added dropwise to the aqueous solution of cetyltrimethylammonium bromide and stirred for 20 minutes to prepare an emulsion. Weigh 20g of styrene-butadiene vulcanizate powder and add it into a three-necked flask. The stirring speed of the mixer is 100r / min, and the swelling is 40min. 0.6g of glutathione was added into the three-necked flask, the speed of the stirrer was 300r / min, and the reaction was carried out for 18h. Then suction filter, wash and dry to obtain desulfurized rubber powder. The prepared desulfurized rubber powder is masticated on an open mill for 12 minutes, and then the finished product of reclaimed rubber is obtained; the finished reclaimed rubber can be directly molded on a vulcanizing machine at 145°C for 3 minutes to obtain a rubber sample. Table 3 com...

Embodiment 3

[0028] Example 3: (1) The yeast cell and water are completely frozen in a container at a volume ratio of 1:1, and the cell and the container are quickly placed in boiling water at 100°C for 15 minutes of pyrolysis, and then frozen for use. The cell wall of Saccharomyces cerevisiae is cleaved during the process of sudden heating from the frozen state, releasing the thiol-containing compounds in the yeast cells. (2) Take 2.0g of hexadecyltrimethylammonium bromide in a 250ml three-necked flask, dissolve it in 60ml of water under the condition of a water bath at 60°C, and dissolve 60ml of the ring under the condition of stirring speed of 1000r / min Add hexane to the aqueous solution of cetyltrimethylammonium bromide and stir for 20 minutes to prepare an emulsion. Weigh 20g of self-made natural rubber powder and add it into a three-necked flask. The stirring speed of the mixer is 100r / min, and the swelling is 40min. Melt 18ml of the lysed yeast cells obtained in step (1) in a water...

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Abstract

The invention relates to a biocatalytic desulfurization method for waste rubber. The target desulfurization method adopts a plurality of hydrosulphonyl (-SH) compound in a microbial cell to catalyze and fracture the chain of the cross bond of perduren. The method comprises the following steps that: cyclane is added into a solution containing a phase change catalyst drop by drop under the heating and high-speed stirring conditions to prepare an emulsion, vulcanized rubber powder is added into the emulsion and is stirred to ensure that the rubber powder swells sufficiently, after the process, the microorganism containing a mercapto-compound is added to perform the desulfurization reaction, after the reaction is over, the mixture is pumped, filtered as well as washed and dried to obtain the vulcanized rubber powder. In the method, the desulfurization efficiency is high, the desulfurization process is simple, the production cost is low, and the microorganism is easily available without special breeding. The desulfurized rubber powder can be directly plasticated and pressed to form and can be added into the novel rubber to prepare rubber products together with the novel rubber.

Description

technical field [0001] The invention relates to waste rubber desulfurization regeneration technology, in particular to a microbial desulfurization method for waste rubber. Background technique [0002] The production of reclaimed rubber by desulfurization of waste rubber is the main way of recycling waste rubber in my country. The commonly used methods are oil method, water oil method and high temperature dynamic desulfurization method. But oil method and water oil method need high temperature, long time, and there is secondary pollution to air and water. The high-temperature dynamic desulfurization method breaks the cross-linking bonds and also leads to the breakage of the main chain of the macromolecule, which reduces the performance of the reclaimed rubber. [0003] In recent years, people have proposed some new methods, such as high-temperature continuous desulfurization, high-speed mixed desulfurization, microwave desulfurization, chemical treatment (such as the low-t...

Claims

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Application Information

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IPC IPC(8): C08J11/10C08J11/28C08L21/00C12N1/16C12R1/865C12R1/72
CPCY02W30/62
Inventor 赵素合覃柳莎王雅琴余秀梅姜广明
Owner BEIJING UNIV OF CHEM TECH
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