| 摘要 |
1,147,567. Hydrodealkylation. TEXACO DEVELOPMENT CORP. 31 July, 1967 [10 Aug., 1966], No.35111/67. Heading C5E. Aromatic hydrocarbons are dealkylated by contact with hydrogen in an unpacked tubular reactor under temperature, pressure and time conditions such that at least 90% conversion is effected, and the selectivity of conversion to dealkylated product is maintained at at least 90 mol per cent by controlling the coking factor K c such that it is maintained in the range 2À0-9À0. K c is defined thus where YH 2 and Y CH4 are, respectively, the hydrogen and methane concentrations in the reactor effluent gas in mole fractions, P t is the total pressure in the reaction zone in atmospheres gauge, and K e is the equilibrium constant for the reaction CH 4 # C + 2H 2 at the maximum temperature in the dealkylation zone. Various ways of controlling K c are indicated, and the process is suitable for producing benzene from toluene, toluene from xylenes, and naphthalene from methyl naphthalene. |
