Depolymerization of thermosetting epoxy resin with environmental-friendly heteropolyacid catalyst at temperatures between 270°C-350°C in H2O medium. The effect of the factors catalyst, temperature and time on the depolymerization was researched. UV spectrum was used to characterize the thermal stability of heteropolyacid catalyst. The products of depolymerization were analysed qualitatively and quantitatively by means of GC/MS and GC. The results indicated that the main depolymerized products were phenol, p-isopropylphenol and bisphenol-A (BPA). The results showed adding heteropolyacid contribute to enhancing the rate of depolymerization and increasing the yield of BPA. Also, the depolymerization kinetics of epoxy resin was researched and the activation energy was calculated.

Hydrothermal depolymerization of DGEBA/EDA epoxy resin was carried out in a stainless autoclave at temperatures of 270°C to 350°C in H2O medium. The effect of the factors catalyst, temperature and time on the depolymerization was researched. The products of depolymerization were analyzed qualitatively and quantitatively by means of GC/MS and GC. The results indicated that the main depolymerized products were phenol, p-isopropylphenol and bisphenol-A (BPA). The epoxy resin composite based on glass fiber and the solid residue after reaction using catalytic hydrothermal depolymerization technology were analyzed by SEM. Also, the depolymerization kinetics of epoxy resin with 3% catalyst and no catalyst were researched and the activation energy was calculated.

Depolymerization of DGEBA/EDA Epoxy Resin was carried out in a microwave reactor, heated for definitized time. Experimental results showed that the products obtained are phenol, bisphenol A, isopropyl phenol. Liquid products were analyzed by high performance liquid chromatography (HPLC) and the standard curve was established by the pure samples and used it to quantify. The results show that the maximum yields of phenol, bisphenol A, isopropyl phenol are 81%,50%,12%.The residual solid after depolymerization were analyzed by infrared spectroscopy and confirmed that it was residual epoxy resin solid. Depolymerization ratio and yields of main products increase with the increase of reaction temperature and time. The most effective medium is BmimCl and the depolymerization ratio can reach 92%, and the test by infrared spectroscopy shows that BmimCl is stable , It can be used for many times.

The activated carbon was prepared by the two-steps carbonization-activation process with printed circuit board (PCB), using KOH, K2CO3, NaOH and Na2CO3 as activators. The influence of temperature, reaction time and the ratio between activator and material on methylene blue value was discussed. Box-behnken design was applied using Design-Expert software to optimize the conditions of preparation according to Response Surface Methodology (RSM).Results showed that activated carbon prepared by chemical activation with KOH or NaOH achieved higher adsorption of methylene blue.