| 摘要 |
2108001 9316027 PCTABS00025 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 = 5 x C4 + 6 x (H2O-2.4) + 0.75 x (CONV-c) + (SV/(25 x Pin)) where: C4 = the mole % of n-butane in the gas entering the reactor; H2O = the mole % moisture in the gas entering the reactor; CONV = % butane conversion in the reactor; SV = gas hourly space velocity of the gas at the inlet of the reactor, reduced to one atmosphere pressure and 60 ·F; Pin = the pressure at the inlet of the reactor (psig); and c = 84 - 0.05 ¢(SV x C4)/Pin!. Irrespective of the computation of N, the trimethyl phosphate content is at least about 1 ppm.
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