Distillation Efficiency for Removal of Solved Minute Water in a Light Hydrocarbon

去除轻质烃中溶解微量水的蒸馏效率

基本信息

批准号：
01550745
负责人：
MUNAKATA Tsuyoshi
金额：
$ 1.47万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

项目摘要

The purpose of this investigation is to make clear the reason why it is said that the efficiency of dehydrating distillation in light hydrocarbon-water system is extremely low. The research results obtained so far are as follows.1. Investigation to past works The head investigator examined relevant literatures and reanalyzed the experimental data in them under taking into account uncertainty of vapor-liquid equilibrium (VLE) relation as well as heat balance, then pointed out the distillation efficiency depends largely upon the estimated value of the VLE relation.2. Measuremen of the VLF relation and examination to the result We examined into experimental apparatus to obtain the VLF data where the condensate of vapor forms two liquid phases, and using a means of providing a liquid decanter within a return pipe of the condensate, measured the VLE relation for three systems of benzene-water, hexane-water, and toluene-water over a wide range in concentration. The values of VLE ratio came u … More p to 2-5 times the data of Lino et. al. Which had been obtained in a range of low water concentration, but agreed fairly well with the values estimated by means of a modified UNIFAC equation.3. Distillation experiment with a packed column and examination to the result Using the Sulzer packing known as a "high efficiency" packing, we conducted a distillation experiment for the three kinds of systems described above. The HETP values obtained were, in contrast to 2-4cm for the heptane-toluene system. 30-40cm for the three hydrocarbon-water systems. This means a remarkable drop in distillation efficiency. Thus we suspected existence of some additional resistance for mass transfer in the change-of-state process between gas and liquid phases and schemed the next experiment with the intention of making use of active agents which can be expected to present catalytic action.4. Distillation experiment with a single stage column and examination to the result At first we conducted a distillation experiment without setting any active agent. Then, in a range of relatively high water concentration, the values of tray efficiency reached as high as those for heptane-toluene system (about 70%) but in a low water concentration range the efficiency became extremely low. This is the calculated result based on the VLE data obtained in item 2 above, and if the VLE ratios in a range of low water concentration diminish abruptly, it can not be said that this efficiency drop is to occur. Hence we consider that, in order to clarify this questionable respect prior to the aforementioned supposition of additional mass transfer resistance, it is necessary to conduct careful measurement of the VLE relations in a range of low water concentration. Less

这项投资的目的是清楚地说明为什么在光碳氢化合物 - 水系统中脱水的效率极低。到目前为止获得的研究结果如下1。对过去工作的调查负责人研究者研究了相关文献，并考虑了蒸气液平衡（VLE）关系的不确定性以及热量平衡的不确定性，并重新分析了它们中的实验数据，然后指出了蒸馏效率很大程度上取决于VLE关系的估计值2。对VLF关系和检查的测量结果我们检查了实验设备，以获取VLF数据，其中蒸气的冷凝物形成两个液相，并使用一种在冷凝水的返回管道内提供液体decanter的方法，测量了VLE的VLE关系，从而测量了VLE的VLE关系，以苯二 - 水，甲烷 - 水，甲基水，甲基水的含量高于浓度范围，并浓缩了三个系统。 VLE比的值是u…更多的P到Lino等人数据的2-5倍。 al。在一系列低水浓度的范围内获得的，但与通过修改的unifac方程估计的值相当良好。3。使用称为“高效率”堆积的Sulzer填料对填充柱进行蒸馏实验，并检查结果，我们对上述三种系统进行了蒸馏实验。与亨普烷系统的2-4厘米相比，获得的HETP值是相比之下。三个碳氢化合物水系统的30-40厘米。这意味着蒸馏效率显着下降。我们怀疑在气体和液相之间的状态变化过程中存在一些额外的抗性，并策划了下一个实验，目的是利用活性剂，可以预期产生催化作用。4。蒸馏实验具有单阶段柱，并检查结果，首先我们进行了蒸馏实验，而没有设置任何活性剂。然后，在一系列相对高的水浓度范围内，托盘效率的值达到的含乙烷 - 苯甲苯系统的值高（约70％），但在低水位浓度范围内，效率变得极低。这是基于上面项目2中获得的VLE数据计算得出的结果，如果在一系列低水位浓度范围内突然减少了VLE比率，则不能说这种效率下降正在发生。因此，我们认为，为了在近似额外的传质抗性之前阐明这一可疑的尊重，有必要在低水浓度范围内仔细测量VLE关系。较少的