A process for the hydrodepolymerization of polymeric waste material at a hydrogen pressure from 20 to 500 bar, with a hydrocracking catalyst made from or containing (a) a hydrogenating component made from or containing a metal selected from the group consisting of Fe, Mo, W, Ti, Ni, Cr, V, Co, Zr, and mixtures thereof, supported on an inorganic carrier, and (b) a depolymerizing component being an acidic compound.

A method of producing powdered polyamide includes: a step 1 of heating and dissolving a polyamide resin composition in a metal chloride alcohol solution containing a metal chloride and an alcohol to obtain a polyamide thermal dissolution liquid; a step 2 of diluting the polyamide thermal dissolution liquid with an alcohol to obtain an alcohol dilution; and a step 3 of cooling the alcohol dilution to cause precipitation of powdered polyamide. The mass proportion of metal chloride relative to 100 mass % of the metal chloride alcohol solution in step 1 is 23 mass % to 35 mass %, the polyamide thermal dissolution liquid contains 0.2 mol to 2.5 mol of water relative to 1 mol of metal chloride in step 1, and the polyamide thermal dissolution liquid is diluted without dropping below a temperature of 50 C. in step 2.