汽液液三相精馏总板效率的研究

在Oldershaw精馏塔内,对汽液液三相精馏筛型塔板上的传质特性进行测试,研究了泡沫工况下,汽速、液汽比等操作条件,表面张力梯度、界面张力、乳化液分散粘度等物系性质,以及油水体积比等多种参数对总板效率的影响、对测试数据进行关联,获得了适用于泡沫工况下汽液液三相精馏过程的总板效率估算式,此关联式对设备设计及操作优化有一定的参考价值.

OVERALL PLATE EFFICIENCY OF THREE-PHASE DISTILLATION IN SIEVE TRAY COLUMN

The overall plate efficiency of vapor-liquid-liquid three-phase distillation was investigated in a sieve-tray Oldershaw distillation column of 50mm diameter . In froth flowregime , the effects on mass transfer of the operating conditions , e.g. vapor velocity and liquid to vapor loading ratio , and the physical properties of liquid phase , including surface tension , interfacial tension , dispersion viscosity , density , diffusion coefficient , relative volatility etc. , were systematically studied . The influence of the oil to water volume ratio on overall efficiency was also investigaed . Three-phase and two-phase distillation operations were compared in terms of plate efficiency . An analysis of the experimental results showed that the overall efficiency for three-phase distillation was lower than that for two-p hase distillation and interfacial tension and dispersion viscosity are the main influence factors . Finally , a correlation equation of overall efficiency for vapor-liquid-liquid three-pha se distillation in froth regime was obtained by regression of experimental data . This empirical correlation may be of some value in design and optimization .