Method for producing waxes and grease base stocks through catalytic depolymerisation of waste plastics

A process for converting primary granules of polyethylene to make waxes and grease base stock through catalytic depolymerization, comprising:

• preheating the primary granules of polyethylene to form a molten primary granules of polyethylene;
• starting depolymerization reaction of the molten primary granules of polyethylene using a catalyst in a pressurized reactor at a desired temperature using heaters in the pressurized reactor and wherein the catalyst is disposed inside the pressurized reactor;
• allowing progression of the depolymerization reaction of the molten primary granules of polyethylene to continue until a pressure in the pressurized reactor reaches a desired value;
• and
• turning off the heaters and stopping the depolymerization reaction of the molten primary granules of polyethylene upon the pressure in the reactor reaching the desired value, wherein the primary granules of polyethylene is converted to wax or grease base stock, and wherein the catalyst is [Fe—Cu—Mo—P]/Al2O3prepared by binding a ferrous-copper complex to an alumina support and reacting it with heteropolyacid.

A process for converting mixed polyethylene waste to make grease base stock through catalytic depolymerization, comprising:

• preheating the mixed polyethylene waste to form a molten mixed polyethylene waste;
• starting depolymerization reaction of the molten mixed polyethylene waste using a catalyst in a pressurized reactor at a desired temperature using heaters in the pressurized reactor and wherein the catalyst is disposed inside the high pressurized reactor;
• allowing progression of the depolymerization reaction of the molten mixed polyethylene waste to continue until a pressure in the pressurized reactor reaches a desired value;
• and
• turning off the heaters and stopping the depolymerization reaction of the molten mixed polyethylene waste upon the pressure in the reactor reaching the desired value, wherein the mixed polyethylene waste is converted to the grease base stock, and wherein the catalyst is [Fe—Cu—Mo—P]/Al2O3 prepared by binding a ferrous-copper complex to an alumina support and reacting it with heteropolyacid.

A process for converting mixed polyethylene waste to make waxes through catalytic depolymerization, comprising:

• preheating the mixed polyethylene waste to form a molten mixed polyethylene waste;
• starting depolymerization reaction of the molten mixed polyethylene waste using a catalyst in a pressurized reactor at a desired temperature using heaters in the pressurized reactor and wherein the catalyst is disposed inside the pressurized reactor;
• allowing progression of the depolymerization reaction of the molten mixed polyethylene waste to continue until a pressure in the pressurized reactor reaches a desired value;
• and
• turning off the heaters and stopping the depolymerization reaction of the molten mixed polyethylene waste upon the pressure in the reactor reaching the desired value, wherein the mixed polyethylene waste is converted to wax, and wherein the catalyst is [Fe—Cu—Mo—P]/Al2O3, prepared by binding a ferrous-copper complex to an alumina support and reacting it with heteropolyacid.