Modeling of mass transfer characteristics of bubble column reactor with surfactant present

Danckwert's method was used to determine the specific interfacial area, a, and the individual mass transfer coefficient, kL, during absorption of CO2 in a bubble column with an anionic surfactant in the carbonate-bicarbonate buffer solution and NaAsO2 as catalyst, the presence of which decreases the specific interfacial area and the individual mass transfer coefficient. The specific interfacial area and the individual mass transfer coefficient increase with increasing superficial gas velocity. The specific interfacial area decreases whereas the individual mass transfer coefficient increases with increasing temperature. The results of experiments were used to determine the dependence of a, kL, and kLa on the surface tension, the temperature of the absorption phase, and the superficial velocity of the gas. The calculated results from the correlation were found to be within 10% deviation from the actual experimental results.     

Enhancement of solubility and mass transfer coefficient of salicylic acid through hydrotropy

This study deals with the effect of hydrotropes on the solubility and mass transfer coefficient of salicylic acid. The solubility and mass transfer studies were performed using the hydrotropes, i.e., sodium acetate, sodium salicylate, citric acid, and urea at concentrations of 0-3.0 mol/L and system temperatures of 303-333 K. It was found that the solubility and mass transfer coefficient of salicylic acid increases with increase in hydrotrope concentration and also with system temperature. All hydrotropes used in this work showed an enhancement in solubility and mass transfer coefficient to different degrees. The maximum enhancement factor values were determined for all hydrotropes used in this study. The highest value was 28.08 for solubility studies and 10.42 for mass transfer studies. The performance of hydrotropes was measured in terms of the Setschenow constant （Ks）. The highest value observed was 0.696.     

SRC-RC转换柱的刚度计算

首先对我国现行SRC-RC竖向混合结构过渡层的设计要求和相关规定提出了不同的看法,建议采用SRC-RC转换柱进行型钢混凝土柱到钢筋混凝土柱的过渡。介绍了SRC-RC转换柱的优点,并在RC柱和SRC柱截面抗弯刚度基础上根据抗弯刚度等效原则合成SRC-RC转换柱的截面抗弯刚度。最后给出了SRC-RC转换柱侧移刚度计算公式。     

Assessment of semi-empirical mass transfer correlations for pervaporation treatment of wastewater contaminated with chlorinated hydrocarbons

INTRODUCTION Chlorinated hydrocarbons, a class of widely used dry-cleaning liquids, industrial organic solvents, and degreasers, increasingly find their way into drinking water sources, thus posing a very serious health and environmental problem (Love and Eliers, 1982). These organic solvents are known for their stability in the environment and cancer-causing po- tency and cannot be effectively and economically eliminated by current conventional treatment tech- nologies. One of the few av…     

SE-12m毛细柱在馏分含萘测定中的应用

本文选用长12米的毛细柱对煤焦油馏分中萘的测定进行了研究,实验结果表明,采用该毛细管柱具有分离效果好,结果准确,重现性好,分析时间短等特点,可替换填充柱,同时也为短毛细柱在分析中的应用提供了参考。     

空气与水直接接触热质交换国内外研究进展

对国内外对空气与水直接接触时热质交换的研究现状及进展进行了综述,主要包括热质交换数学模型和热质交换实验研究,并对今后的研究方向作了初步探讨,为对该问题进行深入研究提供了参考.     

溴化锂溶液热物理性及传质性能实验装置

介绍一套多功能溴化锂吸收式制冷实验装置的设计。通过设计的多功能模块,该装置可以进行传热功能实验、传质功能实验以及溴化锂溶液工程热物理特性研究实验。实验时可以任选装置内部不同功能模块组合进行不同目的的实验。实验装置能够提供高度稳定的温度和压力环境。经过优化设计,该装置具有操作灵活、运行方便、功能多样化、热工参数自动数字监测和控制等特点,可以为开发改良型H2O-LiBr溶液、研发新型吸收式制冷空调设备提供服务。     

CFD simulation with enhancement factor of sulfur dioxide absorption in the spray scrubber

A model describing the absorption process of SO2 into limestone slurry with a spray scrubber is presented. Both the physical performance of the spray liquid in the scrubber and the involved chemical reactions are analyzed in the model. A continuous concentration change ofH＋ was solved by iterative coupling using Matlab, and it was found that there was a remarkable influence on the concentration of the other elements in the process of SO2 absorption. The calculations show that the enhancement factor exponentially grows with an increasing value ofpH and logarithmically decays with an increasing value of the driving force. To verify the accuracy of the model, experiments were also carried out, and the results suggest that the model, after combining the physical performance of the spray and the enhancement factor, can more precisely describe SO2 absorption in a spray scrubber. Furthermore, a commercial computational fluid dynamics （CFD） tool is used to perform several simulations which describe and clarify the effects of variables on SO2 absorption. The results of numerical simulation can provide a basis for further design and optimization of the scrubber.     

氢氧化钠溶液吸收硫酰氟的传质反应动力学

研究目的：研究方法：重要结论：确定氢氧化钠溶液化学吸收硫酰氟的传质反应动力学区域,建立增强因子模型。研究气液传质测定设备双搅拌釜中氢氧化钠溶液化学吸收硫酰氟的过程,并结合实验研究与理论分析建立了增强因子模型。基于氢氧化钠溶液化学吸收硫酰氟过程的实验研究,确定了氢氧化钠溶液化学吸收硫酰氟的传质反应动力学区域为快速拟一级反应。得到了298K下其二级反应速率常数为1．44m3／（mol·s）,并建立了增强因子模型E=68．08CBL1/2,为脱除熏蒸后残留硫酰氟的工业化应用提供了理论依据。