A composite catalyst for pet degradation and pet degradation method

Abstract

The invention discloses a composite catalyst for PET degradation and a PET degradation method. The composite catalyst includes solid organic tin and solid inorganic tin, wherein, in parts by weight, the ratio of solid organic tin to solid inorganic tin is 1.5‑2.5:1. The catalyst of the invention can lighten the color of the degradation liquid.

Description

technical field [0001] The invention relates to a composite catalyst for PET degradation. Background technique [0002] China has become the largest production and consumption country of PET and UPR (unsaturated polyester resin), a large amount of PET urgently needs to be recycled, PET (polyethylene terephthalate) has pyrolysis, biodegradation, chemical degradation (hydrolysis, Aminolysis, alcoholysis) and other recovery methods. The recovery value of pyrolysis is low, the efficiency of biodegradation is low, it is difficult to industrialize, and the recovery value of alcoholysis in chemical degradation is high. At present, many enterprises in the thermoplastic polyester and unsaturated polyester resin industry have put it into industrial production, but the shortcomings are also very obvious. The reaction rate is low and requires many conditions. [0003] In the unsaturated polyester resin industry, more than 100,000 tons of PET are recycled every year to synthesize p-pht...

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Problems solved by technology

[0005] In the above application, the catalyst used is monobutyltin oxide, and the usage amount is 0.1% of PET weight. Although the above method can degrade and produce a transparent liquid, the platinum-cobalt color number of the liquid is 130-150, That is to say, the color is darker. If it is used as a product, it is not beautiful enough, which limits some places where it can be used.

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