| 水杨酸在CO2-乙酸乙酯体系中重结晶过程的相平衡及结晶形态 |
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| 引用本文： | 刘志敏,杨冠英,韩布兴,闫海科. 水杨酸在CO2-乙酸乙酯体系中重结晶过程的相平衡及结晶形态[J]. 过程工程学报, 1999, 20(3) |
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| 作者姓名： | 刘志敏 杨冠英 韩布兴 闫海科 |
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| 作者单位： | 中国科学院化学研究所,北京,100080 |
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| 基金项目： | 国家基金委资助!29633020，29725308 |
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| 摘 要： | 在308．15K和318．15K温度下、0～8MPa压力范围内，研究了二氧化碳一乙酸乙酯-水杨酸体系的相平衡．结果表明，水杨酸在液相中的浓度随体系压力升高而降低，随温度升高而增大．用CO2作抗溶剂可以使乙酸乙酯中的水杨酸沉淀结晶．在相平衡研究的基础上，研究了水杨酸在CO2-乙酸乙酯中的结晶，得到针状空心晶体．
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| 关 键 词： | 二氧化碳 抗溶剂 水杨酸 乙酸乙酯 相平衡 结晶 形态 |
PHASE EQUILIBRIA OF CO2-ETHYL ACETATE-SALICYLIC ACID SYSTEM AND RECRYSTALLIZATION OF SALICYLIC ACID |
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| LIUZhimin,YANGGuanying,HANBuxing,YANHaike. PHASE EQUILIBRIA OF CO2-ETHYL ACETATE-SALICYLIC ACID SYSTEM AND RECRYSTALLIZATION OF SALICYLIC ACID[J]. Chinese Journal of Process Engineering, 1999, 20(3) |
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| Authors: | LIUZhimin YANGGuanying HANBuxing YANHaike |
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| Abstract: | The phase equilibria of CO2-ethyl acetate-salicylic acid system were investigated at 308.15 K and 318.15 K in the pressure range from 1 to 8 MPa. The concentration ofsalicylic acid in liquid phase increases slightly with temperature and decreases with pressure.CO2 can be used as antisolvent to recrystallize salicylic acid from ethyl acetate. On the basiso f the phase equilibria, the recrystallization of salicylic acid was performed by gas antisolventprocess, and hollow needle crystal was obtained. |
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| Keywords: | CO_2 Antisolvent Salicylic acid Ethyl acetate Phase equilibria Recrystallization Morphology |
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