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首页> 外文期刊>Crystal growth & design >Kinetically Driven Crystallization of a Pure Polymorphic Phase of Stearic Acid from CO2-Expanded Solutions
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Kinetically Driven Crystallization of a Pure Polymorphic Phase of Stearic Acid from CO2-Expanded Solutions

机译：硬脂酸从二氧化碳扩张溶液中纯多晶相的动力学驱动结晶

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摘要

The polymorphic nature of microcrystalline solids of stearic acid prepared by the Depressurization of all Expanded Liquid Organic Solution (DELOS) and Gas Antisolvent (GAS) crystallization techniques, both based on CO2-expanded solvents as solvent media, has been studied. The crystalline solids produced by those techniques from "CO2-expanded ethyl acetate" With different contents of CO2 have been analyzed in detail and compared with those prepared by conventional cooling crystallizations, either from pure liquid ethyl acetate solutions or from the melt. It is shown that the monoclinic E form of stearic acid is more favored when using kinetically controlled crystallizations, like the DELOS one, in which a high supersaturation level is rapidly achieved. Remarkably, the DELOS process provides for the first time it pure polymorphic monoclinic E form, without the presence of traces from other polymorphs that always are present when using other kinetically driven methods, such as the conventional fast cooling. On the contrary, the C polymorph is preferentially obtained by the thermodynamically controlled GAS technique in which the increase of the solution supersaturation is slower and/or low supersaturation levels are attained.
机译：研究了通过全部膨胀的液态有机溶液（DELOS）和气体反溶剂（GAS）结晶技术的减压制得的硬脂酸微晶固体的多晶型性质，两者均基于CO2膨胀的溶剂作为溶剂介质。已经详细分析了通过这些技术从“ CO2膨胀的乙酸乙酯”中使用不同含量的CO2产生的结晶固体，并将其与通过常规冷却结晶法（无论是纯液体乙酸乙酯溶液还是熔体）制备的结晶固体进行了比较。结果表明，当使用动力学控制的结晶时（例如DELOS结晶），硬脂酸的单斜晶E形式更受青睐，其中DELOS结晶迅速达到高过饱和度。值得注意的是，DELOS方法首次提供了纯的多晶型单斜晶E形式，而没有使用其他动力学驱动方法（例如常规快速冷却）时总是存在的其他多晶型痕迹。相反，C多晶型物优选通过热力学控制的GAS技术获得，其中溶液过饱和的增加较慢和/或获得的过饱和水平较低。

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