Hydrothermal treatment device and method for waste plastics

Abstract

The invention discloses a hydrothermal treatment device and method for waste plastics. The hydrothermal treatment device comprises a hydrothermal oxidation system, a high-pressure hydrolysis system, awaste plastic smashing system, a mixture pumping system and an oxidizing agent pumping system, wherein the hydrothermal oxidation system is used for performing partial oxidation reaction on the wasteplastics; the high-pressure hydrolysis system is used for further hydrolyzing a product obtained after the oxidation reaction performed by the hydrothermal oxidation system; the waste plastic smashing system is used for smashing the waste plastics and conveying the smashed waste plastics to the hydrothermal oxidation system; the mixture pumping system is used for pumping a water and mother liquormixture to a first preheating system from a first high-pressure pumping system and conveying the preheated mixture to the hydrothermal oxidation system; the oxidizing agent pumping system is used forpumping an oxidizing agent to a second preheating system from a second high-pressure pumping system and conveying the preheated oxidizing agent to the hydrothermal oxidation system. According to thedevice and the method for adopting water as a degradation agent to perform partial oxidation and hydrolysis treatment sequentially under high temperature and high pressure conditions, the waste plastics can be degraded in the relatively simple hydrothermal system.

Description

technical field [0001] The invention relates to a hydrothermal treatment device and method for waste plastics, in particular to a device and a treatment method for hydrolyzing waste plastics after being partially oxidized under high temperature and high pressure conditions, and belongs to the field of environmental protection. Background technique [0002] Due to its excellent performance, polymer plastics are widely used to replace traditional materials such as metal, wood, paper, ceramics, etc., and are used in various fields of national economy and production and life. At present, the volumetric output of plastics in the world has greatly surpassed that of steel, becoming one of the main types of materials. my country is a big country in the production and consumption of plastics, and its apparent consumption ranks second in the world, with an average annual growth rate of 12.3%. With the wide application of plastic products, the generated waste plastics have brought ser...

AI Technical Summary

Problems solved by technology

However, due to the high cost of such reagents and their own environmental hazards, such as benzene, toluene, xylene, tetrahydrofuran and other organic reagents are important environmental pollutants

In addition, due to the complex composition of waste plastics, the degraded products also present the coexistence of various substances

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