| 摘要 |
1,206,860. Hydrodealkylation. INSTITUT FRANCAIS DU PETROLE DES CARBURANTS ET LUBRIFIANTS. 19 Dec., 1968 [20 Dec., 1967], No. 60483/68. Heading C5E. Alkyl-aromatics are hydrodealkylated over a catalyst comprising compounds of at least one metal from each of Groups I A and VIA of the Mendeleev Periodic Table deposited on an alumina having the following characteristics: (a) specific surface: 40-120 m<SP>2</SP>/gm.; (b) porous volume: 0À4-0À8 c.c./gm.; (c) more than 75% of the porous volume corresponds to pores of 100-2000 Š diameter; and (d) an acidity below 0.07 calory/sq. metre measured at 400‹ C. under a reduced pressure of 300 mm. Hg. The catalyst may additionally contain an iron group metal, e.g. Co or Ni, and inert gaseous diluents may be present. Toluene, xylenes, ethylbenzene and isopropylbenzene may be dealkylated, and the products may be desulphurized by hydrogen treatment over a Co/Mo catalyst. |
