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

本次研究的目的是为了弄清轻烃-水体系脱水精馏效率极低的原因。目前取得的研究成果如下： 1．查阅了相关文献，并在考虑汽液平衡(VLE)关系和热平衡的不确定性的情况下重新分析了其中的实验数据，指出蒸馏效率很大程度上取决于VLE关系的估计值。2．的VLF 关系和结果检验我们对实验装置进行了研究，以获得 VLF 数据，其中蒸汽冷凝物形成两个液相，并使用在冷凝物回流管内提供液体倾析器的方法，测量了三种情况的 VLE 关系不同浓度范围内的苯-水、己烷-水和甲苯-水系统的 VLE 比值是 Lino 等人的数据的 2-5 倍。在低水浓度范围内，但与通过改进的 UNIFAC 方程估计的值相当吻合。 3. 使用填料塔进行蒸馏实验并检查结果，使用被称为“高效率”的苏尔寿填料。装填后，我们对上述三种体系进行了蒸馏实验，得到的 HETP 值分别为 2-4cm，而庚烷-甲苯体系的 HETP 值为 30-40cm。显着下降因此，我们怀疑在气相和液相之间的状态变化过程中存在一些额外的传质阻力，并计划了下一个实验，旨在利用预期具有催化作用的活性剂。 .4.单级塔的蒸馏实验及结果检验首先我们进行了不设置任何活性剂的蒸馏实验，然后在较高的水浓度范围内，塔盘效率值高达。庚烷-甲苯体系的那些（约70%），但在低水浓度范围内，效率极低。这是根据上述第2项获得的VLE数据计算的结果，如果没有低水浓度范围内的VLE比率，则不能说。因此我们认为，为了在提到额外传质阻力的假设之前澄清这一有问题的方面，有必要在低水浓度范围内仔细测量 VLE 关系。较少的