Co-liquefaction of cotton gin trash and low-density polyethylene wastes via supercritical ethanolysis for hydrocarbon-rich oil

•Co-liquefaction improved the oil yield and hydrocarbon content in oil.•HHV for oil (31.5 MJ/kg) and solid products (42.5 MJ/kg) was obtained at CGT/LDPE a ratio of 1:2.•Increasing the amount of LDPE in the feedstock increased the hydrocarbon content in oil.•The solid products after co-liquefaction contained high carbon content (75.1 to 79.8%).•A reaction mechanism is proposed based on interactions between CGT and LDPE.