856. ------. [GRESHAM, W. F.] E. I. du Pont de Nemours & Co.). Process for Preparing High-Molecular-Weight Hydrocarbons. United States Patent 2,632,014. Mar. 17, 1953: appl. filed Nov. 3. 1951, Serial No. 254,804; 3 claims (Cl. 260-449).

Patent Abstracts

856. ------. [GRESHAM, W. F.] E. I. du Pont de Nemours & Co.). Process for Preparing High-Molecular-Weight Hydrocarbons. United States Patent 2,632,014. Mar. 17, 1953: appl. filed Nov. 3. 1951, Serial No. 254,804; 3 claims (Cl. 260-449).

Polymethylenes are prepared by introducing H₂, CO, and H₂O into a reaction vessel. The mol. ratio of CO : H₂ is initially >1 : 1 and preferably 2 : 1-12.5 :1/ The reactants are heated in presence of a Ru-containing catalyst and an acidic reagent (maintaining a pH < 2) at a pressure of 200-800 atm. and a temperature of 180º-225º C. The polymethylenes have m. p. 126º-129º C. and inherent viscosities of 0.33-0.36, measured at 0.25% concentration in tetrahydronaphthalene at 125º C. 1 United States patent cited.