微波对乙醇-苯体系汽液平衡和间歇精馏的影响
首发时间:2012-11-09
摘要:采用自制的微波发生器和汽液平衡釜耦合,建立了微波场下的汽液平衡装置,测定了乙醇-苯体系在不同微波功率(0 W、50 W、100 W和200 W)下的汽液平衡数据。实验结果表明,微波对乙醇-苯的汽液平衡没有改变。在微波汽液平衡的基础上,建立了微波间歇精馏装置,进行了乙醇-苯体系在微波功率为150 W下不同初始组成的间歇精馏实验。实验结果表明,微波对塔顶馏分的组成与常规条件下相比,没有明显的改变,但能显著提高塔顶馏分的采出速度。塔顶采出相同质量的馏分,微波作用条件下的操作时间几乎是常规加热条件下的一半,或者说,相同的时间内微波作用条件下收集的塔顶馏分质量是常规加热条件下的两倍,操作时间大大缩短,微波作用于乙醇-苯体系的间歇精馏的效率大大提高。
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Microwave effect on the vapor-liquid equilibrium and batch distillation for ethanol-benzene system
Abstract:The microwave vapor-liquid equilibrium apparatus was established by coupling the microwave generator and the modified Othmer still. The microwave VLE data of ethanol-benzene system were determined at different microwave power (0 W, 50 W, 100 W and 200 W). The experiment result showed that microwave energy did not change the VLE of ethanol-benzene system. The microwave batch distillation was also set up. The ethanol-benzene batch distillation was done with different initial mole fraction at the microwave power of 150 W. The experiment result showed that microwave energy did not change the mole fraction of tower distillate compared with the conventional condition, but improved the rate of tower distillate recovery. The operational time at microwave condition was about half of the time at conventional condition. The operation time was greatly reduced and the efficiency of batch distillation was improved.
Keywords: microwave vapor-liquid equilibrium batch distillation ethanol-benzene system
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