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.
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.
出处
《化工冶金》
CSCD
北大核心
1999年第3期318-321,共4页
基金
国家基金委资助!29633020
29725308
关键词
二氧化碳
水杨酸
乙酸乙酯
相平衡
结晶
CO_2
Antisolvent
Salicylic acid
Ethyl acetate
Phase equilibria
Recrystallization
Morphology