Fractions b. 175° -320° are treated at 120°-150° with masses containing Fe2O3 or Fe(OH)3. The masses are regenerated by treatment with steam or hot H2O at about 175° C.
PRATT, R. S. See abs. 195, 2014.
PRICKETT, T. B. See abs. 1096.
PRING, P. See abs. 3938, 3939.