FIELD: chemistry.
SUBSTANCE: invention relates to device for removal of surface substance of catalyst, present on catalyst surface, from catalyst by bringing gas flow in contact with catalyst, located inside main case of device. Claimed device includes: main case, accumulating device for accumulation of catalyst, located in upper part of main case; and return device for return of catalyst, connected with accumulating device. Return device is located in such a way that its lower end is in contact with said gas flow, and part of catalyst, which is in contact with gas flow inside main case, is accumulated by accumulation device and returned inside main case by return device, length of gas flow in direction of gas flow constitutes 55 mm or more, and average rate of gas flow constitutes 80 m/s or more and 500 m/s or less counted per linear rate at 15°C and 1 atm. Invention also relates to method of removal of surface substance of catalyst from catalyst and method of obtaining unsaturated acid or unsaturated nitrile, in which surface substance of catalyst is removed from catalyst by means of claimed device.
EFFECT: claimed device makes it possible to effectively remove precipitated out and/or adhered surface substances of catalyst.
8 cl, 7 dwg, 11 ex
