| 摘要 |
An improvement in a process for the manufacture of maleic anhydride by catalytic oxidation of n-butane in the presence of trimethyl phosphate over a fixed bed vanadium phosphorus oxide catalyst in a tubular reactor. The trimethyl phosphate content of the gas entering the reactor within a range of between about (0.9) N and about (1.1) N where N is a normative concentration of trimethyl phosphate in ppm as determined by the following relationship: N+5xC4+6x(H2O-2.4)+0.75x(CONV-c)+(SV/(25xPin)) where: C4xthe mole % of n-butane in the gas entering the reactor; H2Oxthe mole % moisture in the gas entering the reactor; CONVx% butane conversion in the reactor; SVxgas hourly space velocity of the gas at the inlet of the reactor, reduced to one atmosphere pressure and 60 DEG F.; Pinxthe pressure at the inlet of the reactor (psig); and cx84-0.05[(SVxC4)/Pin]; Irrespective of the computation of N, the trimethyl phosphate content is at least about 1 ppm. |
