US 11,746,392 B2
Drying of allulose crystals
Ulrich Bongers, Kerpen (DE); Stephan Mohr, Euskirchen (DE); Steffen Butz, Kreuzau (DE); Anna Junklewitz, Wuppertal (DE); Timo Koch, Elsdorf (DE); and Michael Bognar, Dormagen (DE)
Assigned to SAVANNA INGREDIENTS GMBH, Elsdorf (DE)
Filed by Savanna Ingredients GmbH, Elsdorf (DE)
Filed on Nov. 18, 2021, as Appl. No. 17/529,841.
Claims priority of application No. 20209177 (EP), filed on Nov. 23, 2020.
Prior Publication US 2022/0162715 A1, May 26, 2022
Int. Cl. C13K 13/00 (2006.01)
CPC C13K 13/00 (2013.01) 19 Claims
 
1. A process for drying allulose crystals comprising the following steps:
(a) providing non-dried allulose crystals,
(b) temperature treating the non-dried allulose crystals according to step (a) at a temperature in the range of about 25 to about 70° C. in a drying apparatus having 2 to 5 different heating zones to obtain an intermediate product, wherein the temperature treatment is carried out
(b1) at atmospheric pressure and a residence time in the range of about 5 minutes to about 5 hours, or
(b2) under reduced pressure and constant temperature and a residence time ranging from about 30 min to 5 hours, and
(c) conditioning the intermediate product obtained in step (b1) or (b2), wherein conditioning is carried out
(c1) over a period of about 30 min to 7 hours at a temperature in the range of about 40 to about 70° C., or
(c2) over a period of about 15 to about 90 hours with air of a relative humidity of about 30 to about 60% and at a temperature of about 25 to about 40° C.