Low-temperature zero-pressure anhydrous rubber low-oxygen catalytic regeneration method

Abstract

The invention relates to a low-temperature zero-pressure anhydrous rubber low-oxygen catalytic regeneration method which is characterized by comprising the following steps: 1) treating waste rubber to obtain rubber powder; (2) adding the rubber powder into a low-temperature container, adding an auxiliary agent, heating for reaction, and continuously introducing mixed gas of low-concentration oxygen in the reaction process; after the reaction is finished, cooling to obtain regenerated rubber powder; the auxiliary agent comprises a catalyst and a softening agent and does not comprise water, and the catalyst comprises trimethylaluminum and polyamines; the heating temperature in the reaction process is higher than the softening point of the softener and is not higher than 140 DEG C; the rubber regeneration method disclosed by the invention can be realized under low-temperature and zero-pressure conditions, and is low in equipment cost, high in safety, low in energy consumption cost, free of discharge of waste gas and waste water and free of environmental protection cost. The regenerated rubber prepared by the method is good in quality, and various indexes accord with GB / T13460.

Description

technical field [0001] The invention relates to a low-temperature zero-pressure anhydrous rubber low-oxygen catalytic regeneration method, and belongs to the technical field of rubber regeneration. Background technique [0002] The recycling technology of waste rubber after recycling has been relatively mature, but the current recycling process of waste rubber is pyrolysis under high temperature and high pressure conditions, the reaction temperature is about 300 ℃, and the reaction pressure is about 3MPa. This process requires the reaction vessel to be a pressure vessel, generally a desulfurization tank made of manganese steel over 20mm, and the equipment cost is high. In addition, the desulfurization tank is prone to bulging or even frying under high temperature and high pressure conditions, which poses a greater safety hazard. In addition, the process needs to be carried out under high temperature conditions, and the energy consumption cost is high. In addition, steam ne...

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Problems solved by technology

This process requires the reaction vessel to be a pressure vessel, generally a desulfurization tank made of manganese steel with a thickness of more than 20mm, and the equipment cost is high

Moreover, the desulfurization tank is prone to bulging or even bursting under high temperature and high pressure conditions, which poses a great safety hazard

In addition, the process needs to be carried out under high temperature conditions, and the cost of energy consumption is high

In addition, steam needs to be introduced during the reaction process, which will generate a large amount of waste gas and waste water. The waste gas and waste water need to be purified to meet the environmental protection emission requirements, so a large cost investment in environmental protection equipment is required.

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