I'm trying to obtain xylose crystals from the aqueous phase of an acid hydrolysis-derived process. After evaporating the water, we performed an ethanol extraction in cold. It was supposed to yield xylose crystals, but I had none. Would any of you recommend a different protocol?
Emilio Vieyra
it was perhaps utilised so much ethanol. I saw that xylose is soluble in hot ehtanol.. try to extract in hot ethanol and after cool it as mucha as possible. I di not know if you will recover al xylose. but after cooling and filtration you can try to evaporate the most of the ethanol and cool it again.
you can try to concentrate your actual solution by cold ethanol evaporation under vaccum in a rotating evaporator.
good luck
We have a patent over this process in Brazil BR102012013327(B1) see at espacenet.com
ABSTRACT BR102012013327A2
CRYSTALLIZATION OF XYLITOL IN WATER-ETHANOL USING XYLITOL AND SILICA (NANOPARTICULATE) PYROGENIC AS SEED, belonging to the sector of saturated compounds having hydroxyl groups attached to acyclic carbon atoms, in the form of acyclic polyhydroxy alcohols, consists of a xylitol crystallization process contained in a water-ethanol mixture through crystallization induced by heterogeneous primary nucleation, having fumed silica (nanoparticulate) as seed. The field of application and objective of this invention consists in the recovery of xylitol obtained by any means of production, and the invention consists in the application or use of fumed silica (nanoparticulate) with crystals of 5 to 7 nm in the formation of crystals with heterogeneous nuclei, aiming at the more efficient crystallization of xylitol in saturated solution. In the process "CRYSTALIZATION OF XYLITOL IN WATER-ETHANOL USING XYLITOL AND (NANOPARTICULATE) PYROGENIC SILICA AS SEED", for nucleation, grains (nanometric) of fumed silica are used in the crystallization process by cooling, using the initial saturation temperature of xylitol and a cooling speed that facilitate the formation of xylitol crystals in the solution.
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