METHOD OF CONTINUOUS PREPARATION OF METHIONINE CRYSTALS OF HIGH BULK DENSITY Russian patent published in 2019 - IPC C07C323/58 C07C319/28 B01D9/02 

FIELD: manufacturing technology.

SUBSTANCE: invention relates to a method for the continuous preparation of high bulk density methionine crystals. Process is as follows: mix the solution of the hydrolyzate containing potassium and methionine and the resulting 5-(β-methylmercaptoethyl)hydantoin and a solution of potassium carbonate with an external circulation material from a neutralization crystallizer with a circulation tube and a septum (TsiP) having a gas-phase neutralization section; after cooling, the mixture material is introduced into the liquid distributor of the neutralization area in the upper part of the crystallizer and is sprayed in the form of drops or thin streams of liquid into the zone of contact of gas and liquid for carrying out the neutralization reaction, after which the fall of the neutralization solution in a natural way to the crystallization region in the lower part, where it mixes with the material in the said region; provide the cultivation of the mixture on small crystals in the system for the formation of crystals, having particles of larger diameter, and at the same time new crystallization centers are formed; in the deposition zone in the middle part of the crystallization region, crystals with particles of larger diameter are deposited in the pipe for wet elutriation of crystals, while small crystals circulate with the material of external circulation, and part of the material of external circulation is used for wet elutriation of crystals in the pipe for wet elutriation of crystals, while the other part of this material is mixed with a solution of hydrolyzate; and the crystals in the nozzle for wet elutriation of crystals are subjected to separation, washed and dried to obtain a product of methionine high bulk density.

EFFECT: continuous preparation of methionine crystals of high bulk density.

12 cl, 1 dwg, 5 ex, 1 tbl