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Method for desulfurating and regenerating waste rubber by using microbes

A technology for regenerating waste rubber and microbial bacteria, applied in the direction of microorganism-based methods, biochemical equipment and methods, microorganisms, etc., can solve the problems of high energy consumption, waste gas and waste water, and secondary pollution in the regeneration process, and achieve low equipment requirements , the process is simple and controllable, and the effect of mild process conditions

Active Publication Date: 2014-07-16
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both physical and chemical methods have certain defects.
For example, the physical method uses external energy sources such as microwaves and ultrasonic waves, and its regeneration process consumes a lot of energy.
The chemical additives used by the chemical method will also produce more waste gas and waste water during the process of cracking rubber, causing secondary pollution.
Therefore, neither the physical method nor the chemical method meets the requirements of my country's waste rubber recycling industry to transform into low-carbon and harmless.

Method used

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  • Method for desulfurating and regenerating waste rubber by using microbes
  • Method for desulfurating and regenerating waste rubber by using microbes
  • Method for desulfurating and regenerating waste rubber by using microbes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Strains: Gordonia friendly, purchased from China Industrial Microorganism Culture Collection and Management Center.

[0024] Rubber: self-made isoprene rubber vulcanized rubber filled with 50 parts by weight of carbon black, self-crushed into isoprene rubber powder with a diameter of 50-200 microns.

[0025] Medium: Glucose 2g, NH 4 Cl2g, KH 2 PO 4 2.44g, Na 2 HPO 4 5.57g, MgCl 2 0.2g, CaCl 2 0.04g, FeCl 3 ·7H 2 O0.04g, MnCl 2 4H 2 O0.008g, ZnCl 2 0.001g, CoCl 2 ·6H 2 O0.004g, AlCl 3 ·6H 2 O0.001g, CuCl 2 2H 2 O0.001g, H 3 BO 3 0.001g, NaMoO 4 2H 2 O0.001g, deionized water 1000mL.

[0026] Co-cultivation-regeneration process: use 75% ethanol to soak the isoprene rubber powder for 24 hours for detoxification; add 50mL medium to a 250mL shake flask with an initial pH of 6, and sterilize at 115°C for 20 minutes; After the temperature of the culture medium dropped to 25°C, 10% (v / v) of Gordonia friendly strains were added and cultivated for 48 hours; d...

Embodiment 2

[0029] Strains: Gordonia friendly, purchased from China Industrial Microorganism Culture Collection and Management Center.

[0030] Rubber: self-made natural rubber vulcanizate, self-crushed into natural rubber powder with a diameter of 50-200 microns.

[0031] Medium: Glucose 4g, NH 4 Cl2g, KH 2 PO 4 2.44g, Na 2 HPO 4 5.57g, MgCl 2 0.2g, CaCl 2 0.04g, FeCl 3 ·7H 2 O0.04g, MnCl 2 4H 2 O0.008g, ZnCl 2 0.001g, CoCl 2 ·6H 2 O0.004g, AlCl 3 ·6H 2 O0.001g, CuCl 2 2H 2 O0.001g, H 3 BO 3 0.001g, NaMoO 4 2H 2 O0.001g, deionized water 1000mL.

[0032]Co-cultivation-regeneration process: use ethanol with a concentration of 75% by volume to soak natural rubber powder for 24 hours for detoxification; add 50mL medium to a 250mL shake flask with an initial pH of 7.0, and sterilize at 115°C for 20 minutes; After the base temperature dropped to 30°C, 10% (v / v) of Gordonia friendly strains were added and cultivated for 48 hours; detoxified natural rubber powder was added,...

Embodiment 3

[0035] Strains: Gordonia friendly, purchased from China Industrial Microorganism Culture Collection and Management Center.

[0036] Rubber: self-made styrene-butadiene rubber vulcanized rubber filled with 30 parts by weight of carbon black, self-crushed into styrene-butadiene rubber powder with a diameter of 50-200 microns.

[0037] Medium: Glucose 4g, NH 4 Cl2g, KH 2 PO 4 2.44g, Na 2 HPO 4 5.57g, MgCl 2 0.2g, CaCl 2 0.04g, FeCl 3 ·7H 2 O0.04g, MnCl 2 4H 2 O0.008g, ZnCl 2 0.001g, CoCl 2 ·6H 2 O0.004g, AlCl 3 ·6H 2 O0.001g, CuCl 2 2H 2 O0.001g, H 3 BO 3 0.001g, NaMoO 4 2H 2 O0.001g, deionized water 1000mL.

[0038] Co-cultivation-regeneration process: Soak styrene-butadiene rubber powder in 75% ethanol for 24 hours for detoxification; add 50 mL of culture medium to a 250 mL shake flask with an initial pH of 7.0, and sterilize at 115°C for 20 minutes; After the temperature of the culture medium dropped to 30°C, 10% (v / v) of Gordonia friendly strains were ad...

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Abstract

The invention relates to a method for desulfurating and regenerating waste rubber. Microbes and waste vulcanized rubber powder co-culture desulphurase generated in the metabolic process to catalyze breakage of the S-S or S-C cross bond on the surface of vulcanized rubber, so that the surfaces of waste vulcanized rubber particles are decrosslinked in a certain depth range, thus reaching the purpose of desulfuration and regeneration of waste rubber. In the method, the medium component of Gordonia amicalis with good desulfurating effect and the conditions of the coculture desulfurization process are determined, wherein the conditions include the glucose concentration and strain inoculum size in a culture medium, as well as the reaction temperature and time, culture solution pH and reactor stirring speed in a reaction process; through measurement of crosslinking density of rubber powder and the detection of the surface element content of the rubber powder show that the crosslinking density and the surface elemental sulfur content of the desulfurated rubber powder are reduced and the oxygen content of the desulfurated rubber powder is increased, compared with undesulfured rubber powder.

Description

technical field [0001] The invention relates to a technology for desulfurization and regeneration of rubber, in particular to a desulfurization regeneration method and process for co-cultivation of microbial bacteria desulfurization waste rubber. Background technique [0002] my country is a big consumer of rubber resources, but most rubber resources depend on imports, and the contradiction between supply and demand is very prominent. The impact of the shortage of rubber resources on the development of the national economy is increasingly apparent. Therefore, the recycling and reuse of waste rubber is an urgent problem to be solved in our country. However, due to the existence of three-dimensional network in its molecular structure, a large amount of waste rubber is not easy to degrade in the environment, which has become a huge pollution problem and also caused great difficulties for the recycling of rubber. [0003] After long-term exploration, people have invented many m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P1/04C12R1/01
CPCC08J11/105C08J2319/00Y02W30/62
Inventor 赵素合胡明翰王炳武王雅琴付雅琪李超
Owner BEIJING UNIV OF CHEM TECH
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