STUDY ON THE CO-LIQUEFACTION OF COAL, WASTE PLASTIC AND TAR SLAG

摘要

Most plastic products are discarded after use and end up in sanitary landfills with the fast development of modern society. The disposal of waste plastics (WP) generated in China is posing a serious environmental problem. It has been of great interest to develop new disposal techniques to solve the re-pollution issue of the reuse of WP, either as raw materials or as a source of energy and/or chemicals. Chemical recycling or conversion of WP into fuels or chemicals is being investigated as an alternative to such disposal. Particularly, conversion of WP to liquid fuels is logical since plastics are very rich in hydrogen and carbon. The atomic H/C ratio in WP is closer to that in petroleum. Taghiei et al. [1] reported thermal and catalytic liquefaction of WP, and laboratory-generated mixed plastics, with and without coal. It was reported that direct liquefaction should be considered not only as a solution for WP disposal but also for generating an environmentally acceptable transportation fuel or feedstock for the production of virgin plastics [2-3]. Moreover, coliquefaction of plastic wastes with aromatic-rich materials such as coal could yield synergistic effects and increase the production of oil from this source. Besides, oil slag from coking process is also one of the useful carbon sources, which needs to be reused.