Abstract:

The chemical recycling of waste plastics is considered to be the only technology that can realize the sustainable development of plastic resources. In particular， the pyrolysis technology has attracted a great deal of attention. Based on the own superiority， Sinopec has carried out a comprehensive design and developed several different methods for the chemical recycling of plastic wastes. A novel technology of Sinopec plastic wastes was developed to produce the low impurity oil （SPWO） through the physical removal of impurities coupling with solvent pyrolysis. It achieved the goal of maximizing the production of low?impurity oils， building up a good basis for the full recycling of waste plastics. A microwave?assisted pyrolysis technology of plastic wastes was developed to produce olefins in one step. The cetane number reached 61.2 for the diesel fraction obtained from the hydrogenation of plastic wastes pyrolysis oil. The gasoline yield reached 50 % when using the catalytic cracking technology to produce gasoline. The gasoline yield reached 30 % and the total yield of ethylene and propylene reached 18 % when using the catalytic cracking technology to produce gasoline and olefin. The hydrogenation?steam cracking technology of plastic wastes pyrolysis oil for olefins was designed and developed， and the olefin （ethylene， propylene and butadiene） yield reached 41.9 %. The carbon footprint analysis of chemical recycling technology routes for different plastic wastes was carried out. Compared to the carbon emissions of the petroleum?based refineries and incineration for power generation technology， the chemical recycling of plastic wastes exhibits good carbon reduction competitiveness.

Key words: plastic wastes, chemical recycling, pyrolysis oil processing, carbon footprint analysis