Xylitol

Catalog	BBC87990
CAS	87-99-0
Structure
Synonyms	Wood sugar alcohol
IUPAC Name	(2S,4R)-Pentane-1,2,3,4,5-pentol
Molecular Weight	152.15
Molecular Formula	C5H12O5
Canonical SMILES	C(C(C(C(CO)O)O)O)O
InChI	InChI=1S/C5H12O5/c6-1-3(8)5(10)4(9)2-7/h3-10H,1-2H2/t3-,4+,5?
InChI Key	HEBKCHPVOIAQTA-NGQZWQHPSA-N
Boiling Point	215-217 °C
Melting Point	94-97 °C(lit.)
Flash Point	261.9 °C
Purity	98%
Density	1.515 g/cm³
Solubility	Soluble in water
Appearance	White crystalline powder
Storage	Room temperature
pKa	13.24±0.20(Predicted)
Refractive Index	1.3920
Solubility in Water	Soluble

Case Study

Preparation of a Choline Chloride-Xylitol Solvent Mixture for Cathode Material Separation

Niu, Jiahui, et al. Process Safety and Environmental Protection 190 (2024): 77-84.

Lithium-ion batteries (LIBs) are critical energy storage devices experiencing rapid growth, which has led to increasing metal waste from spent LIBs. A major challenge in recycling these batteries lies in separating cathode materials from aluminum (Al) foil due to the strong adhesive properties of polyvinylidene fluoride (PVDF). To address this, a novel low-melting mixture solvent (LoMMS) based on a choline chloride-xylitol system was developed, offering advantages such as low toxicity, cost-effectiveness, and environmental sustainability.
Preparation Procedure:
A choline chloride-xylitol solvent mixture was prepared at a 2:1 mass ratio. The components were weighed accurately to prepare a 70% solution and placed in a 50 mL beaker. The mixture was heated and magnetically stirred at 80 °C for 15 minutes until a uniform, transparent liquid formed. Upon completion, the mixture was allowed to cool to room temperature, resulting in the choline chloride-xylitol LoMMS system.
The method for separating cathode materials from Al foil in discarded LIBs, specifically lithium cobalt oxide (LCO), using this LoMMS system is illustrated in the accompanying figure. Optimal separation conditions were achieved with a 2:1 molar ratio of choline chloride to xylitol.

Synthesis of an Adsorbent (Xylitol-AC) for Diborane (B₂H₆) Removal in Polysilicon Production

Liang, Qingxin, and Guoqiang Huang. Separation and Purification Technology 345 (2024): 127414.

To improve the purity of polysilicon by removing diborane (B₂H₆) impurities from recycled hydrogen (H₂) during polysilicon production, an adsorbent based on activated carbon (AC) impregnated with xylitol was developed.
Preparation of the Adsorbent:
Xylitol-AC was synthesized using an impregnation method. First, the AC was thoroughly washed three times with distilled water to remove impurities, then dried at 110 °C in an air blast drying oven until a constant weight was achieved, ensuring the removal of residual water and contaminants.
Next, the dried AC was immersed in a 0.15 mol·L^-1 xylitol solution (with a solid-liquid ratio of 1:20) and heated at 50 °C for 12 hours. After impregnation, the sample was again dried at 110 °C until a constant weight was achieved. The resulting adsorbent, prepared under these conditions, is referred to as Xylitol-AC.

Synthesis of Novel Solid-Liquid Phase Change Materials (PCMs) Using Xylitol

Biçer, Alper, and Ahmet Sarı. Solar energy materials and solar cells 102 (2012): 125-130.

To address the unfavorable thermal properties of xylitol, stearic acid, and palmitic acid, xylitol pentastearate and xylitol pentapalmitate were developed as novel solid-liquid PCMs through an esterification reaction between xylitol and the respective fatty acids.
PCMs Synthesis Procedure:
The synthesis began with the preparation of palmitic acid chloride and stearic acid chloride following a previously reported method. In the second step, esterification was carried out using 5.5 mol of one of the fatty acid chlorides and 1 mol of xylitol dissolved in toluene. The reaction mixture was stirred at 85 °C for 5 hours, and progress was monitored by the release of hydrogen chloride gas.
After completing the reaction, unreacted toluene was removed via rotary evaporation at 60 °C. The residue was dissolved in chloroform, washed four times with 0.03 M NaHCO₃ alkaline solution to remove impurities, and dried. The reaction mechanism is depicted in the accompanying figure.