Depolymerization of used polyethylene to hydrocarbons using dual catalysts

Abstract

Hydro cracking of used polyethylene to liquid hydrocarbons was studied. The catalyst consisted of 5-10% wt of iron. Cobalt and nickel. 2.5-5% wt to tin and 1-2%wt of fluoride on the various pore sizes of molecular sieve. The used polyethylene was depolymerized by varying the catalyst in amounts of 20-40% wt. temperature (350-390℃). hydrogen pressure (400-600 psig) for 0.5-4 hours. The optimum conditions were at 390℃ 500 psig for 4 hours using 40%wt of Ni(10%)-F(2%) on molecular sieve (4A-DG type) catalyst. The yield of oil product was 84.0%wt. and it consisted of C8- C20 hydrocarbons. The pore size of the molecular sieve did not influence the molecular weight distribution of the products.