Process for producing compound

Abstract

A process for producing a compound by use of a fluidized bed reactor comprising an internal space having a catalyst housed in a fluidizable manner therein, a first feed port into which a starting material gas comprising a hydrocarbon is fed to the fluidized bed reactor, a second feed port into which an oxygen-containing gas comprising oxygen is fed to the fluidized bed reactor, and a discharge port into which a reaction product gas is discharged from the fluidized bed reactor, including a reaction step of subjecting the hydrocarbon to a vapor phase catalytic oxidation reaction or a vapor phase catalytic ammoxidation reaction in the presence of the catalyst in the internal space to produce the corresponding unsaturated acid or unsaturated nitrile, respectively, wherein in the reaction step, a linear velocity (m/sec) of the starting material gas at the first feed port is adjusted against a degree of abrasion resistance (%) of the catalyst so as to satisfy a prescribed relation between them.