蒸馏-结晶耦合分离乙酸-邻二甲苯的研究

Study on separation of o-xylene and acetic acid by distillation-crystallization hybrid process

蒸馏-结晶耦合技术是涉及汽-液、固-液平衡的新型分离技术,适用易结晶物质分离,近来也应用到形成恒沸物或组分的挥发度非常接近的难分离物系和形成低共熔物的二元物系。采用蒸馏-结晶法分离乙酸-邻二甲苯,以此二元体系的汽液、固液平衡相图为理论依据,结合实验验证了蒸馏-结晶耦合技术能够打破并超越共沸组成限制,提高产品的纯度。证明采用蒸馏-结晶耦合技术分离具有共沸物的二元体系是可行的,结晶产品乙酸纯度可达到91%。

Distillation-crystallization hybrid separation process is a new separation technology,referring to vapor-liquild,solid-liquild equilibrium envelopes.Lately it is applied to separate binary systems such as azeotropes,eutectic or that their volatility are close.Based on the vapor-liquild,solid-liquild phase diagram for o-xylene and acetic acid binary system,combining with experiments,distillation-crystallization hybrid separation process proves that it can bypass the azeotropes in the vapor-liquild equilibriu...