| abstract |
PCT No. PCT/JP95/01059 Sec. 371 Date Dec. 20, 1996 Sec. 102(e) Date Dec. 20, 1996 PCT Filed May 31, 1995 PCT Pub. No. WO96/10548 PCT Pub. Date Apr. 11, 1996Disclosed is a method for producing aromatic hydrocarbons, which comprises contacting a light hydrocarbon feedstock comprising olefins and/or paraffins with a zeolite catalyst in a fixed-bed, adiabatic reactor containing a fixed catalyst bed comprised of the zeolite catalyst, to thereby effect a catalytic cyclization reaction of the light hydrocarbon feedstock, wherein the catalytic cyclization reaction is performed under conditions which satisfy the following requirements: (1) the zeolite catalyst has an initial stage-catalytic activity of 0.2 (sec-1) or more in terms of the initial stage, first-order reaction rate constant of the decomposition of n-hexane catalyzed by the zeolite catalyst; (2) the catalyst bed has a temperature of from 450 DEG C. to 650 DEG C.; (3) the catalyst bed exhibits a temperature distribution with respect to the distance from an inlet to an outlet of the catalyst bed, wherein the temperature distribution has at least one maximum temperature value; and (4) the temperature of the outlet of the catalyst bed is +/-40 DEG C. relative to the temperature of the inlet of the catalyst bed. By the method of the present invention, not only can aromatic hydrocarbons be produced in high yield, but also the lowering of the catalytic activity is small, so that the production of aromatic hydrocarbons can be stably conducted for a prolonged period of time. |