Calcination apparatus, process for producing oxide catalyst, and process for producing unsaturated acid or unsaturated nitrile

摘要

Disclosed is a calcination apparatus, including: a calcination tube having open ends at both terminals; a pair of hoods, each hood covering each open end of the calcination tube; and a pair of rings, each ring sealing a gap between the calcination tube and the hood, wherein the rings are directly or indirectly fixed on an outer surface of the calcination tube; a groove is provided along a circumferential direction of the ring at a contact surface side between the ring and the hood; a sealed chamber surrounded by the hood and the groove is formed; and both the calcination tube and the rings rotate in a circumferential direction of the calcination tube while keeping the hood in contact with both sides of the groove.

主权项

1. A process for producing an oxide catalyst, the process comprising the steps of:
feeding a catalyst precursor containing Mo, V, Nb, and Te and/or Sb from a first end of a calcination tube of a calcination apparatus comprising: a calcination tube having open ends at both terminals; a pair of hoods, each hood covering each open end of the calcination tube; and a pair of rings, each ring sealing a gap between the calcination tube and the hood, wherein the rings are directly or indirectly fixed on an outer surface of the calcination tube; a groove is provided along a circumferential direction of the ring at a contact surface side between the ring and the hood; the each hoods comprises a pair of flanges, each flange protruding from an inner surface of the hood toward an inside in a circumferential direction of the calcination tube, wherein each of the both sides of the groove is in contact with each of the pair of flanges: a sealed chamber surrounded by the hood and the groove is formed; and both the calcination tube and the rings rotate in a circumferential direction of the calcination tube while keeping each of the pair of flanges of the hood in contact with both sides of the groove; calcining the catalyst precursor in the calcination tube to yield a calcination product; causing the catalyst precursor and/or the calcination product to pass through a space surrounded by the calcination tube, a hood, and a ring; and discharging the calcination product from the space.