METHOD FOR DESUBLIMATION OF SOLID SUBSTANCES AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2018 - IPC B01D7/02 B01F3/02 B01F13/10 C07C63/06 C07C51/573 C07D307/89 C07C51/43 

FIELD: technological processes.

SUBSTANCE: invention relates to desublimation equipment and can be used in chemical and pharmaceutical industries. Method for desublimating of solid substances involves loading at least two kinds of desublimated substances into sublimators, their melting and sublimation with the formation of dissimilar sublimated vapors, the interaction of sublimated vapors with the cold carrier gas above the upper section of the vapor-gas distribution chamber of the sublimator located coaxially with the vapor-gas distribution chamber, to the supersaturation state of vapor-gas mixtures, desublimation of the finished mixture of vapors with formation of particles of required sizes, and separation of the finished product, besides, before desublimation at the outlet from the channels of the upper section of the vapor-gas distribution chamber, initial mixing of the vapors of substances is carried out even in the sublimated phase by directing their flows at an angle towards each other, with the subsequent desublimation simultaneously with their final mixing in one zone, which is the mixing-desublimation zone, when interacting with the cold carrier gas as they move in the desublimator mixer. Device for carrying out this method comprises sublimators 1, 2, vapor-gas distributing chamber 3 with grid 13 and channels for supplying vapors of desublimated products 7, 8 and cold carrier gas 25, desublimator 9 and finished product separation units 26, 28, the desublimator being combined with the mixer and being desublimator-mixer 9, below vapor-gas distribution chamber 3 is located consisting of two sections – bottom 5 and upper 6, bottom section 5 is located on one of sublimers 1 located coaxially to vapor-gas distributing chamber 3, mixer-desublimator 9, vapor-gas distributing chamber 3 and sublimator 1 located coaxially with vapor-gas distribution chamber 3 are located in one housing, second sublimator 2 is located outside the housing and is connected to bottom section 5 of vapor-gas distribution chamber 3 heated with steampipe 4, channels 7, 8 of vapor-gas distribution chamber 3 with grid 13 being annular and its central channel in the form of a cylindrical tube, the openings of the channels for supplying vapors of desublimated products have nozzles 16, 17, 18 installed in them, central channel nozzle 16 is installed along the axis of vapor-gas distributing chamber 3 and is made conical, other nozzles 17 on the openings of the channels II are made annular with a cross-section in the form of an isosceles triangle, and the walls of the annular nozzles are inclined to the longitudinal axis of vapor-gas distribution chamber 3, with the formation of double-sided slots for exit of sublimate vapors towards the center of mixer-desublimator 9 and to its side wall, and in the outer annular channel I a one-sided slot is formed between the inner wall of annular nozzle 18 and the opening of the outer annular channel I to exit the sublimate vapors towards the center of mixer-desublimator 9, inlet openings 14 in the channels of bottom section 5 of vapor-gas distribution chamber 3 are formed above sublimator 1 arranged coaxially with vapor-gas distribution chamber 3, inlet openings 11 of the channels of upper section 6 are located above bottom section 5 of vapor-gas distribution chamber 3, and grid 13 installed in the upper part of upper section 6 of vapor-gas distribution chamber 3 is made of individual rings, and all annular channels 7 in bottom section 5 of vapor-gas distribution chamber 3 have radial flows 10 for distributing the sublimate vapor from second sublimator 2, located outside the housing, throughout the whole bottom section, and all annular channels 8 in upper section 6 of vapor-gas distribution chamber 3 have radial flows 12 for distributing the cold carrier gas along the whole upper section 6.

EFFECT: technical result of the invention is the possibility of obtaining a mixture of fine and extrafine materials in volumes of a product of not more than 3 mg.

2 cl, 7 dwg, 1 tbl