
362
U
Urbain
U.S. Patent 5,580,905.
Yoshioka, T. and Grause, G., in Feedstock Recycling and Pyrolysis of Waste Plastics, Scheirs, J. and Kaminsky, W.,
Eds., John Wiley & Sons, Chichester, U.K., 2006, 648.
Urbain A process for activating charcoal by heating it with phosphoric acid and then washing with hydrochloric
acid. Invented by E. Urbain in 1923; the product was used in the 1920s and 1930s for recovering benzole vapor.
British Patent 218,242.
French Patent 579,596.
Claxton, G., Benzoles: Production and Uses, National Benzole & Allied Products Assoc., London, U.K., 1961, 417.
Urea 2000plus A process for making urea from ammonium carbamate, using ...