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A high-temperature co-carbonization agent and its application in the carbonization process of plastic waste to increase carbon and fix impurities

A carbonization agent and waste technology, applied in other chemical processes, carbon compounds, reagents, etc., can solve the problems of reducing the content of impurity-containing small molecules, low solid carbonization rate, and low carbonization yield, so as to reduce the gas yield , Improve the yield of the carbonization process, and have a universal effect

Active Publication Date: 2020-12-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the deficiencies of the existing technology, in order to solve the problems of high content of nitrogen, oxygen, sulfur, chlorine heteroatoms and low solid carbonation rate in the gas products existing in the process of plastic waste recycling, it is proposed to use low-cost co-carbonization agent and plastic The new scheme design of co-carbonization of waste resources, with the help of resonance stable free radicals contained in the co-carbonization agent, spontaneously driven addition reaction, "capturing" small molecules containing impurities (nitrogen / oxygen / sulfur / chlorine) to achieve multiple Growth of ring aromatics to increase char formation rate
Co-charring agents are easy to react with unsaturated hydrocarbons, fused-ring aromatic hydrocarbons, non-conjugated free radicals, especially various carbon-centered free radicals with strong electronegative substitution atoms (nitrogen, oxygen, sulfur, chlorine), so With good universality and versatility, it effectively solves the problem of low carbonization yield of conventional plastics, turns waste into treasure, and reduces the content of impurity and small molecules in the gas, and has good industrial application potential

Method used

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  • A high-temperature co-carbonization agent and its application in the carbonization process of plastic waste to increase carbon and fix impurities
  • A high-temperature co-carbonization agent and its application in the carbonization process of plastic waste to increase carbon and fix impurities
  • A high-temperature co-carbonization agent and its application in the carbonization process of plastic waste to increase carbon and fix impurities

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]The polyurethane waste was desorbed to remove Freon residues, dried, and pulverized (200 mesh), and then coal tar pitch and polyurethane powder were mixed at a ratio of 0.3:1 to obtain carbonized raw materials (10 g). After putting into the carbonization chamber, nitrogen gas is introduced to remove the air in the carbonization chamber, and the whole reaction process is protected by nitrogen gas. When carbonizing, put the carbonized raw material into the high-temperature heating equipment at one time, the carbonized temperature is 300°C, the carbonized time is 8 hours, and the pressure is 5MPa. After the reaction is completed, the equipment is closed, and the solid product is taken out to obtain the carbonized material. The resulting carbonized material and activator CaCl 2 Mix according to the ratio of 2:1, add to the high-temperature heating equipment, pass the air in the nitrogen removal device, the activation temperature is 700°C, and the activation time is 1 hour. ...

Embodiment 2

[0038] The polyurethane waste was desorbed to remove Freon residues, dried and pulverized (200 mesh), and then coal tar pitch and polyurethane powder were mixed at a ratio of 0.3:1 to obtain carbonized raw materials (about 10 g). After putting into the carbonization chamber, nitrogen gas is introduced to remove the air in the carbonization chamber, and the whole reaction process is protected by nitrogen gas. When carbonizing, put the carbonized raw material into the high-temperature heating equipment at one time, the carbonized temperature is 400°C, the carbonized time is 8 hours, and the pressure is 5MPa. After the reaction is completed, the equipment is closed, and the solid product is taken out to obtain the carbonized material. The resulting carbonized material and activator CaCl 2 Mix according to the ratio of 2:1, add to the high-temperature heating equipment, pass the air in the nitrogen removal device, the activation temperature is 700°C, and the activation time is 1 h...

Embodiment 3

[0040] The polyurethane waste was desorbed to remove Freon residues, dried and pulverized (200 mesh), and then coal tar pitch and polyurethane powder were mixed at a ratio of 0.3:1 to obtain carbonized raw materials (about 10 g). After putting into the carbonization chamber, nitrogen gas is introduced to remove the air in the carbonization chamber, and the whole reaction process is protected by nitrogen gas. When carbonizing, put the carbonized raw material into the high-temperature heating equipment at one time, the carbonized temperature is 500°C, the carbonized time is 8 hours, and the pressure is 5MPa. After the reaction is completed, the equipment is closed, and the solid product is taken out to obtain the carbonized material. The resulting carbonized material and activator CaCl 2 Mix according to the ratio of 2:1, add to the high-temperature heating equipment, pass the air in the nitrogen removal device, the activation temperature is 700°C, and the activation time is 1 h...

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Abstract

The invention relates to a high-temperature co-carbonization agent and application thereof to recarburizing and impurity fixing in the carbonization process of plastic waste. The application of the high-temperature co-carbonization agent to recarburizing and impurity fixing in the carbonization process of the plastic waste comprises the steps that polyurethane waste is pretreated; the pretreated polyurethane powder is mixed with the co-carbonization agent, and carbonization is carried out under the protection of inert gas to form a carbonization material; and the carbonization material is mixed with an activating agent, high-temperature activation is carried out under the protection of the inert gas, the activating agent is removed, and drying is carried out to obtain an activated carbon product. According to the high-temperature co-carbonization agent and the application thereof tp recarburizing and impurity fixing in the carbonization process of the plastic waste, a synergistic effect existing between waste polyurethane plastics and the co-carbonization agent is used for improving the carbonization process yield, the activated carbon is prepared through high yield, the gas yieldand impurity-contained micromolecules in the preparation process are reduced, waste is turned into wealth, and good industrial application potentiality can be achieved.

Description

technical field [0001] The invention belongs to the technical field related to solid waste (polyurethane plastics) disposal and recycling, and specifically relates to a method for converting waste plastics in daily life into activated carbon with a high yield and reducing them. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] As of 2015, 6.3 billion tons of plastic waste has been generated globally since the mass production and application of plastic began 60 years ago, of which about 90.5% are now located in landfills and oceans. my country is currently the largest plastic producer and exporter, and the comprehensive utilization rate of plastic waste is only 9%, causing s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/324C01B32/33C01B32/348C02F1/28B01D53/02B01J20/20B01J20/30
CPCB01D53/02B01D2253/102B01J20/20C02F1/283C01B32/324C01B32/33C01B32/348Y02P20/155
Inventor 李茁戴杨陈坤桑骏才李维宁戴仁伟
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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