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PYROLYSIS RECYCLING METHOD FOR ORGANIC COMPONENT IN WASTE LIGHT-EMITTING DIODE

A pyrolysis recycling method for an organic component in a waste light-emitting diode, relating to the technical field of photoelectric device recycling. In the present invention, firstly, pyrolysis is performed for a waste light-emitting diode, a volatile component is collected, and metal is enriched; the volatile component is condensed to obtain a pyrolytic gas and a pyrolytic oil, and the pyrolytic gas is purified and then combusted for heat reuse; ammonia water is added into the pyrolytic oil, heating is carried out for reaction, the liquid is left standing for layering, a separated water layer is heated to recycle ammonia gas, and an oil layer is subjected to high-speed centrifugation to separate out a black oil layer and crude silicone oil; the black oil layer is subjected to water washing, drying, extraction by an organic solvent, and distillation under reduced pressure to prepare crude phenol. According to the present invention, by using pyrolysis, metal in a waste light-emitting diode is effectively enriched, thereby facilitating comprehensive recycling of the metal, and the effect of 20%-25% volume reduction of the waste light-emitting diode is achieved in the pyrolysis process. According to the present invention, the pyrolytic gas is directly reused after being purified, such that energy consumption is reduced. According to the present invention, phenol separated using ammonia water is used, and the use of a strong alkali and a strong acid is avoided.


» Number: WO2023108859A1 (A1)

» Publication Date: 22/06/2023

» Applicant: BEIJING UNIV OF TECHNOLOGY?[CN]

» Inventor: LI BIN?[CN]; TAO RAN?[CN] (2)

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