Hydrothermal Liquefaction (HTL) technology has a high potential for the production of oil from unsorted plastic waste. HTL of polyolefins (PE, PP and PS) is a process developed originally for converting biomass into value-added products.

Recently, there are initiatives to apply HTL to plastic waste. HTL uses hot water at near- and supercritical conditions as the reaction medium. The process occurs in a single fluid-phase as the organic compounds are readily dissolved in the water with lower dielectric constant under these conditions.

The need of high energy-consuming drying step is avoided which increases the energy efficiency and allows the use of wet feedstock and slurries.

Learn about the other technologies to integrate plastic waste in the circular economy: