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Method for preparing rubber powder from waste and old tires through thermal dissolution and depolymerization

A technology for waste tires and thermal dissolution, which is applied in special forms of dry distillation, bulk chemical production, petroleum industry, etc., can solve the problems of secondary pollution, high cost, complex pyrolysis technology, etc., and achieve low and high thermal dissolution temperature Utilization of added value and effect of improving economy

Active Publication Date: 2016-05-04
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pyrolysis technology is complicated and costly, and it is easy to cause secondary pollution, and the quality of recycled materials is not good and unstable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 5g of 1-butyl-3-methylimidazolium trifluoromethanesulfonate, 2ml of tetrahydronaphthalene, and 1g of waste tires, mix them evenly, place them in a tubular shaking kettle, and react at 50°C for 4h. Naturally cool to room temperature after the reaction; then wash out the obtained reaction product with tetrahydrofuran, and obtain the mixture and residue of tetrahydrofuran solubles, tetrahydrofuran, ionic liquid and tetrahydronaphthalene by filtration, and the mixture can be recovered by rotary evaporation The solvent is used to obtain a mixture; finally, water is added to the mixture to precipitate and filtered to obtain rubber powder and a mixed solution of ionic liquid and tetralin, and the mixed solution of ionic liquid and tetralin can be reused. The rubber powder is weighed and the yield of the rubber powder is calculated. The yield of the obtained rubber powder was 30.1%.

Embodiment 2

[0021] Weigh 1 g of 1-butyl-3-methylimidazolium trifluoromethanesulfonate, 10 ml of tetralin and 1 g of waste tires, mix them evenly, place them in a tubular shaking kettle, and react at 150° C. for 2 h. Naturally cool to room temperature after the reaction; then wash out the obtained reaction product with tetrahydrofuran, and obtain the mixture and residue of tetrahydrofuran solubles, tetrahydrofuran, ionic liquid and tetrahydronaphthalene by filtration, and the mixture can be recovered by rotary evaporation The solvent is used to obtain a mixture; finally, water is added to the mixture to precipitate and filtered to obtain rubber powder and a mixed solution of ionic liquid and tetralin, and the mixed solution of ionic liquid and tetralin can be reused. The rubber powder is weighed and the yield of the rubber powder is calculated. The yield of the obtained rubber powder was 55.9%.

Embodiment 3

[0023] Weigh 5g of 1-butyl-3-methylimidazolium trifluoromethanesulfonate, 2ml of tetrahydronaphthalene, and 1g of waste tires, mix them evenly, place them in a tubular shaking kettle, and react at 250°C for 3h. Naturally cool to room temperature after the reaction; then wash out the obtained reaction product with tetrahydrofuran, and obtain the mixture and residue of tetrahydrofuran solubles, tetrahydrofuran, ionic liquid and tetrahydronaphthalene by filtration, and the mixture can be recovered by rotary evaporation The solvent is used to obtain a mixture; finally, water is added to the mixture to precipitate and filtered to obtain rubber powder and a mixed solution of ionic liquid and tetralin, and the mixed solution of ionic liquid and tetralin can be reused. The rubber powder is weighed and the yield of the rubber powder is calculated. The yield of the obtained rubber powder was 52.8%.

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Abstract

The invention discloses a method for preparing rubber powder from waste and old tires through thermal dissolution and depolymerization, belonging to the technical field of comprehensive utilization of waste and old tires. The method comprises the following steps: selecting an ionic liquid and a hydrogen supplying solvent capable of highly efficiently depolymerizing the structures of the waste and old tires, adding the waste and old tires, the ionic liquid and the hydrogen supplying solvent into a reaction vessel and carrying out thermal dissolution and depolymerization under mild conditions; eluting out obtained reaction products with tetrahydrofuran and then carrying out filtering so as to obtain a mixed solution of a tetrahydrofuran soluble substance, tetrahydrofuran, the ionic liquid and tertralin and residues, wherein the mixed solution may be subjected to rotary evaporation to recover the solvent so as to obtain a mixture; and adding water into the mixture and carrying out precipitation and filtering so as to obtain rubber powder and a mixed solution of the ionic liquid and tertralin, wherein the mixed solution of the ionic liquid and tertralin can be repeatedly used. The method is simple and clean, carries out thermal dissolution and depolymerization on the waste and old tires, catalyzes thermal dissolution and depolymerization of the tires into the rubber powder and carbon black, and realizes high-added-value utilization of the waste and old tires.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of waste tires, and in particular relates to a method and process for depolymerizing waste tires into rubber powder by adopting thermal solution polymerization technology. Background technique [0002] my country's current tire waste ranks first in the world, with more than 10 million tons of waste tires produced every year, but the recycling rate is only 60%, which is lower than the utilization rate of about 90% in developed countries. In 2013, more than 300 million waste tires were produced, with a weight of 15 million tons, equivalent to about 5.3 million tons of natural rubber resources, equivalent to 6.5 years of natural rubber production in my country. Scrap tires are waste that take up a lot of environmental space, are difficult to compress, collect and eliminate, and are not biodegradable. Its composition also includes some dangerous elements, such as lead, chromium, cad...

Claims

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Application Information

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IPC IPC(8): C10B53/07C09C1/48
CPCC09C1/48C10B53/07Y02P20/143Y02P20/54
Inventor 雷智平张凯水恒福王知彩任世彪
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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