Trend on the Recycling Technologies for Recycling of Insoluble/infusible Plastic Wastes using Supercritical Fluids by the Patent and Paper Analysis

Abstract

It is believed to have the international competitiveness of the domestic petrochemical in conjunction with the production of high value-added new product and variety of application by supercritical fluid process and the reaction of infusible/insoluble plastic wastes recycling. In this article, the patents and papers for the recycling of organic residues from the plastic wastes using supercritical fluids were collected and analyzed. The open patents of USA (US), European Union (EP), Japan (JP), and Korea (KR) and SCI journals from 1993 to 2012 were investigated. The patents and journals were collected using key-words and filtered by the definition of the technology. The patents and journals were analyzed by the years, countries, companies, and technologies and the technical trends were discussed in this paper.

Preparation of De-crosslinked Polyethylene from Waste Crosslinked High-Density Polyethylene Using Supercritical Twin-Screw Extrusion

“…Crosslinked HDPE, also known as PEX, is widely used for carrying hot water at high temperatures and cannot be reshaped because they do not melt under heat, owing to a crosslinked network structure with a crosslinking degree of more than 90%. [3][4][5][6][7] As a result, most PEX is incinerated. This is caused by the lack of proper treatment or recycling methods, and the insoluble and infusible nature of the intramolecular crosslinked network of polymer chains.…”