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Effects of Assisting Solvents on Purification Efficiency in the Layer Melt Crystallization of Glycerol
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2024-02-21 , DOI: 10.1021/acs.cgd.3c01207 Mitra Ila 1 , Kim Miikki 2 , Marjatta Louhi-Kultanen 1
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2024-02-21 , DOI: 10.1021/acs.cgd.3c01207 Mitra Ila 1 , Kim Miikki 2 , Marjatta Louhi-Kultanen 1
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The efficiency of layer melt crystallization for the selective separation of glycerol from a glycerol–diethylene glycol mixture containing 4 wt % of diethylene glycol was evaluated using solvent-free and solvent-aided approaches. The effect of 1-butanol and the binary solvent of 1-butanol and acetone with a total molar composition of 25 mol % on the crystal growth kinetics and the purity of the final product was studied at different undercooling degrees and crystallization yields. The melting point temperature of the mixtures was predicted by using the modified UNIFAC Dortmund model. The addition of both a single and binary solvents significantly increased the crystal growth rate and purity of the final product compared to crystallization from the solvent-free mixture. Additionally, higher crystal growth rates and product purity were observed in the binary solvent system compared to those in the single solvent system at the same degree of undercooling. The second stage of solvent-aided crystallization resulted in glycerol with a purity above 99.5 wt %, depending on the type of solvent used and the rate of crystal growth.
中文翻译：
甘油层熔融结晶过程中辅助溶剂对纯化效率的影响
使用无溶剂和溶剂辅助方法评估了层熔融结晶从含有 4 wt% 二甘醇的甘油-二甘醇混合物中选择性分离甘油的效率。研究了1-丁醇以及总摩尔组成为25 mol%的1-丁醇和丙酮的二元溶剂在不同过冷度和结晶收率下对晶体生长动力学和最终产物纯度的影响。使用改进的 UNIFAC Dortmund 模型预测混合物的熔点温度。与从无溶剂混合物中结晶相比，添加单一溶剂和二元溶剂显着提高了最终产品的晶体生长速率和纯度。此外，在相同过冷度下，与单一溶剂系统相比，二元溶剂系统中观察到更高的晶体生长速率和产品纯度。溶剂辅助结晶的第二阶段产生的甘油纯度高于 99.5 wt%，具体取决于所用溶剂的类型和晶体生长速率。
更新日期：2024-02-21
中文翻译：
甘油层熔融结晶过程中辅助溶剂对纯化效率的影响
使用无溶剂和溶剂辅助方法评估了层熔融结晶从含有 4 wt% 二甘醇的甘油-二甘醇混合物中选择性分离甘油的效率。研究了1-丁醇以及总摩尔组成为25 mol%的1-丁醇和丙酮的二元溶剂在不同过冷度和结晶收率下对晶体生长动力学和最终产物纯度的影响。使用改进的 UNIFAC Dortmund 模型预测混合物的熔点温度。与从无溶剂混合物中结晶相比，添加单一溶剂和二元溶剂显着提高了最终产品的晶体生长速率和纯度。此外，在相同过冷度下，与单一溶剂系统相比，二元溶剂系统中观察到更高的晶体生长速率和产品纯度。溶剂辅助结晶的第二阶段产生的甘油纯度高于 99.5 wt%，具体取决于所用溶剂的类型和晶体生长速率。
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