METHOD OF PRODUCING FREE-RUNNING FORM OF POWDERED CHOLINE CHLORIDE FROM AQUEOUS SOLUTION THEREOF Russian patent published in 2013 - IPC A23K1/16 C07C215/40 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing a free-running form of powdered choline chloride from an aqueous solution thereof. Squeezed beet pulp with moisture content of 82…84% is preheated in a heating chamber to temperature of 80…90°C, and then dried in a vibration drier which is superheated with steam at atmospheric pressure with temperature of 135…140°C and speed of 1.5 m/s. Drying is carried out in a pulsed vibrofluidised bed to moisture content of 12…13%, wherein in the working chamber of the vibration drier, the layer of the product is brought into a vibrofluidised state for 3 s every 60 s by a gas-distributing array. The array has amplitude and frequency of vibration of 7 mm and 12.5 Hz, respectively. Spent superheated steam at temperature of 105…110°C from the vibration drier is first fed into a cyclone purifier for purification from a fine fraction which is combined with dried beet chips, and the purified spent superheated steam is then divided into two streams. One stream, formed when drying the product, is fed into a calorifier, where it is condensed and atmospheric air is heated through the separating wall of the calorifier to temperature of 65…70°C. The other stream is fed by a fan into a steam superheater in order to be superheated to temperature of 13.5…140°C with heating steam obtained in a steam generator at temperature of 150…155°C, and then into the vibration drier to form a recirculation loop. The condensate of the heating steam at temperature of 140…145°C, after the steam superheater, is combined with the condensate of the spent superheated steam at temperature of 95…100°C after the calorifier and fed into a condensate collecting tank. The obtained condensate mixture at temperature of 120…125°C from the condensate collecting tank is fed into the heating chamber for preliminary heating of the squeezed beet pulp, followed by returning into the steam generator to form a recirculation loop and removing excess condensate from the recirculation loop. The obtained dried beet pulp is ground to particle size of 1 mm and fractionated on a sieving machine. Sieve screenings are taken for regrinding, and the substance passing through the sieve is mixed with the starting 70% aqueous choline chloride solution, preheated to temperature of 35…40°C, in ratio of 2:3. The obtained mixture with moisture content of 47…50% is fed into the drier, where it is dried in a fluidised bed to final moisture content of 10% with atmospheric air, which is heated in the calorifier to temperature of 65…70°C with air flow rate in the working chamber of the drier of 0.8…1.0 m/s. Spent atmospheric air at temperature of 40…45°C from the drier is first fed for purification into the cyclone purifier, and then into the heater for heating the starting choline chloride solution before feeding into the mixture. The fine fraction of choline chloride obtained after purification is combined with a stream of ready powdered choline chloride after drying and taken for cooling.

EFFECT: method enables to obtain powdered choline chloride of high quality, enables preservation of vitamin B₄ in the end product and prevents thermal decomposition of vitamin B₄ in the initial 70% aqueous solution.

1 dwg