Printed Circuit Boards With Epoxy Resin Vacuum Pyrolysis Pyrolysis Oil Composition Analysis Of The Pilot Study

Due to the rapid replacement of old model by latest advanced model time to time caused short average lifespan of electrical and electronic equipment(EEE) and conse quently led to yield mass generation of waste electrical and electronic equipment (WEEE).WEEE had become the fastest growing and the most difficlut to be disp osed solid waste following the city and industry waste.How to deal with the waste PCB while avoiding secondary pollution had become a hot research.Several technogies had been applied to dispose of waste PCB, compared to just metal recovery, it had develped into recycling of all resources of waste PCB.One possible method of recycling printed circuit boards and recovering both the organic and non-organic fraction is pyrolysis. Pyrolysis is a thermal recycling technique that has been widely researched as a method of recycling synthetic polymers including polymers that are mixed with glass fibres,which has been the most widely studied. vacuum Pyrolysis is an extension of pyrolysis,which has a better effect on disposing waste PCB. Therefore,the present paper investigated the process and products of vacuum Pyrolysis.The effects of vacuum pyrolysis conditions on the products yield of epoxy resin in waste printed circuit boards were studied using the pyrolysis oven heated by temperature controller. The effect of temperature, heating rate,pressure , hold time and condensing temperature on the yield of vacuum pyrolysis production were analyzed. Experimental results showed that temperature was the key factor during the vacuum pyrolysis process, at the same time, heating rate, pressure and hold time were not neglected factor on the product yield. Suggested the following optimisation conditions for the liquid yield from the vacuum pyrolysis process: temperature (400-550°C), heating rate (15-20°C/min), pressure (15 kPa), hold time (30 min), condensing temperature (-25°C).The compositions of vacuum pyrolysis products were analyzed by FT-IR , GC/MS, Ultimate analysis and SEM. And the component's distribution of liquid yield on different pressure and pyrolysis temperature were studied in detail. Experimental results showed that the density of liquid yield chnged with diffierent pressure, component's distribution of liquid yield was different with different conditions. The vacuum pyrolysis liquid consisted of phenolic organic compound and bromic organic compound. The solid of pyrolysis products main contained coke and glass fiber, and the pyrolysis gas main contained H₂,CO,CO₂,CH₄,C₂H₆.