Research progress on comprehensive utilization of waste foamed polystyrene plastics

Polystyrene foam is one of the most widely used plastic products because of its light weight,low apparent density,uneasy decomposition,low cost and so on.At the same time,the amount of waste is also increasing,and this kind of polymer is difficult to degrade in nature and its combustion will produce toxic substances.The different recovery of the waste brings a lot of problems to the environment.Recycling or resource utilization of WFPS can not only improve the environment,but also conform to the concept of "low carbon".The recovery methods of WFPS,including solvent recovery and pyrolysis recovery,were introduced in detail.The recycling and reuse of WFPS in the fields of energy,construction and environmental protection were summarized.It is pointed out that the WFPS recovery technology with high-efficiency,environmental protection and low-cost needs to be further developed.Combined with the recycling status of WFPS in China,the prospects of recycling and reuse technology of WFPS in the future are proposed as following: 1) Development of large-scale solvent recovery technology that takes into account both economy and environmental protection;2) Research and development of high-efficiency catalysts for catalytic cracking and recovery of monomers;3) Focusing on high value-added WFPS resource utilization technology research.