Special method for industrial treatment on waste plastic in classified garbage

Abstract

The invention relates to the field of garage treatment and chemical engineering, and to a method for pretreating plastic sorted from living garbage with hot air. The method comprises the following steps: drying moisture of waste plastic through blowing, performing primary decontamination, feeding into a liquidation kettle by using special continuous feeding equipment, performing liquidation in the liquidation kettle, feeding into a splitting kettle, condensing gases of the splitting kettle through a heat exchanger, wherein oil separated from the gases, together with heavy oil in the splitting kettle, are used as raw materials of petrochemical plants, and uncondensed gases separated from the gases are used as heat energy for heating the splitting kettle. The liquidation kettle consists of a heat preservation part and a heating part; heat conduction oil is fed into an interlayer in the heat-preservation kettle; constant temperature is kept through electric heating; the heating part is achieved through returned high-temperature oil after splitting in the splitting kettle. The method is fully automatic, sealing is achieved in the whole process, no pollution is caused, the energy consumption is low, operation is easy to carry out, plastic is rapidly liquidized according to characteristics of plastic in waste treatment plants and is liquidized through high-temperature oil, the problems that waste plastic is easy to coke when being heated, is low in heat conduction rate and the like are solved, and industrial treatment on waste plastic in sorted garbage is achieved.

Description

technical field [0001] The invention relates to a method specially used for the industrialized treatment of waste plastics in classified garbage. Background technique [0002] Pyrolysis of waste plastics is to heat plastics in an oxygen-free or low-oxygen sealed container to crack them into low molecular compounds. The basic principle is to completely crack the macromolecules of the polymers in the plastic products and return them to the low molecular weight state or monomer state. According to the position of bond breakage in macromolecules, pyrolysis can be divided into depolymerization reaction type, random cracking type and intermediate type. When the depolymerization reaction type plastic is thermally cracked, the polymer dissociates to generate monomers, which mainly cut off the chemical bonds between single molecules. Such plastics include α-methylstyrene, polymethyl methacrylate, etc., which are almost 100% cracked into monomers. When the random cracking plastic i...

AI Technical Summary

Problems solved by technology

[0003] 1. In order to solve the problem that existing similar processes cannot be produced industrially, the present invention provides a method for recycling plastics based on the composition and physical characteristics of household waste. Low consumption, environmental protection and no pollution;

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