用于环丁砜芳烃抽提的高效填料萃取塔

对内弯弧形筋片扁环填料用于环丁砜芳烃抽提工艺过程进行了冷模和热模实验研究。实验结果表明,此种新型填料的传质效率比大孔筛板塔高30％以上。在此基础上,对φ1.0m的工业装置进行了技术改造,使抽余油含芳量下降了6％,而塔的处理能力提高了10％。     

填料类型对脉冲填料萃取塔性能的影响

采用３０％ＴＢＰ（煤油）／ＨＡｃ／水体系研究了脉冲填料萃取塔的流体动力学和传质特性,考察了脉冲强度和填普类型对塔性能的影响。实验表明装填ＱＨ－１型扁环的脉冲填料 性能明显优于装填陶瓷和不锈钢拉西环的脉冲塔。文中给出了装填ＱＨ－１型扁环的脉冲填普塔的特性速度和Ｈｏｘｐ的经验计算式。     

复合填料萃取塔操作性能研究

在内径为０．１ｍ，高度为１．０ｍ的玻璃萃取塔中，对四种不同填料用低界面张力体系（正丁醇－丁二酸－水）研究了填料塔的流体力学和传质性能，实验结果表明，用其中的两种填料组合的复合填料萃取塔具有较大的通量和较高的传质效率，可望在工业装置中得到推广应用。     

国产脉冲填料性能研究

在直径为262 mm有机玻璃塔内,用空气一水体系对国产50 mm陶瓷脉冲填料进行了流体力学性能的测试,得出了干、湿填料压降,载、泛点气速关联式。以Na_2SO_3溶液在钻离子催化下用空气氧化法测定了液相传质系数和有效表面,并对有效表面、载点气速提出了新的关联式。试验结果表明,国产脉冲填料与西德产脉冲填料一样,具有良好的流体力学性能和传质性能。     

空气搅动的填料萃取塔性能实验研究

引　言气体搅动是一种外加能量的萃取方法 .与机械搅拌相比 ,气体搅动的萃取塔内无运动部件 ,操作稳定 ,结构简单 ,能耗低 .过去已有数篇关于气体搅动的混合 -澄清槽[1] 、喷洒塔[2～ 4 ] 、多级连续萃取器[5] 等无填料的萃取过程水力学性能和传质性能的文献报道 .而在填料塔萃取过程中加入气体搅动技术 ,一方面继承了填料可以有效地降低轴向返混的优越性能 ;另一方面 ,通过外加能量进一步强化液 -液两相接触与传质 ,提高传质系数 ,综合了外加能量的萃取技术和填料萃取技术的优点 .关于这方面的内容目前少有报道[6] .1　实验装置与实验方法…     

填料萃取塔流体力学特性的研究

本文用三种物系:煤油-水、煤油-26.1％甘油水溶液,二乙基己醇-水。填料塔的直径是75mm,用三种类型的填料:瓷拉西环、瓷矩鞍环、瓷θ环。在无传质的情况下,对填料萃取塔的分散相滞存率和压降进行研究。根据实验数据用线性回归法得到可预测泛点条件下的压降和分散相滞存率的关联式。     

润滑油糠醛精制填料萃取塔的传质性能

针对润滑油精制工业装置技术改造的需求,选用低界面张力的润滑油－糠醛精制体系,在ф１００ｍｍ的填料萃取塔中对孔板纹填料和共轭环填料的萃取性能进行了实验研究。结果表明,共轭环填料用于低界面张力体系萃取过程时传质性能优于孔板波纹填料。     

QH—1新型填料萃取塔轴向混合和传质性能研究

针对润滑油精制等实际应用的特点，选用低界面张力的正丁醇－丁二酸－水体系，在φ１００ｍｍ的填料萃取柱中对国外引进的两种新型填料和我校新开发的ＱＨ－１型填料的萃取性能进行了比较。结果表明，ＱＨ－１型填料的传质效率最高，轴向返混最小。     

板波填料萃取塔的实验研究(Ⅱ)传质性能

本文应用扩散模型并采用最优化方法拟合实测的稳态浓度剖面,在内径40mm、100mm的板波填料萃取塔中,用30%TBP(煤油)-醋酸-水和正丁醇-丁二酸-水两种体系研究了板波填料萃取塔的传质性能.     

脉冲填料萃取塔的绿色设计

在用脉冲填料塔（以苯为溶剂）萃取硫酸铵水溶液中己内酰胺的过程中,由于设备正常操作时溶剂泄漏以及公用工程中锅炉燃油燃烧,部分苯和有害气体排放到大气中,对环境产生不可忽视的影响.今根据绿色设计思想,引入化学物质环境影响因子和化学物质边际环境损害的概念,将萃取塔和溶剂回收塔中泄漏的苯,以及锅炉燃烧排放的硫、氮氧化物、二氧化碳等化学物质引起的环境损害进行了量化,并综合考虑萃取过程的经济成本（设备和操作成本）和环境影响,提出了新的设计目标函数,优化确定了脉冲填料塔的绿色设计结果,并与传统设计结果作了比较.     

填料特性对鼓泡填料萃取塔性能影响

填料的结构与表面性能对鼓泡填料萃取塔性能有直接影响。利用空气 煤油 (苯甲酸 ) 水体系 ,测定了未装填料和分别装填板波填料、丝网填料、压延孔环填料的鼓泡萃取塔水力学性能和传质性能。实验表明 ,对未装填料和装有填料的萃取塔 ,气相搅拌都可以显著提高液液两相的接触与传质性能 ;液泛速度随表观气速的增大而下降 ;流道设计合理的规整填料传质性能明显高于散装填料 ;表面光滑的填料分散相滞存率低 ,因而液泛速度较高 ;填料的作用有利于降低轴向返混 ,明显提高萃取塔传质性能。     

Extraction of Caprolactam from Aqueous Ammonium Sulfate Solution in Pulsed Packed Column Using 250Y Mellapak Packings

1 INTRODUCTION Caprolactam is a major ingredient in the manufacture of nylon 6 fibers. In the process of caprolactam production, there is about 1% caprolactam in the aqueous ammonium sulfate solution after Beckmann rearrangement and neu-tralization. So far, the 1% caprolactam has been extracted by benzene in an ordinary sieve-plate column with 60% recovery in Zhejiang Juhua Group Company in China, while being extracted in a pulsed packed column with 95% recovery abroad[1—3]. Because …     

在脉冲填料柱中萃取硫酸铵溶液中的己内酰胺

Liquid-lquid equilbrium(LLE)data of water-caprolactam-benzene-(NH4)2SO4 system at 303K were measured for extraction of caprolactam from aqueous ammonium sulfate solution.The influence of fluid flow rate,pulsation intensity on flooding velocity and mass transfer was studied for extraction of caprolactam from ammonium sulfate solution in a laboratory pulsed packed column.The flooding velocities and overall apparent heght of a transfer unit were given under various operation conditions.An industrial column developed based on above study is operated well.The scale-up effect is discussed.     

Performance of an Industrial Pulsed Disc-and-Doughnut Extraction Column

Axial-dispersion and plug-flow models have been used to describe the solvent extraction performance of a 18 m high and 4 m diameter industrial pulsed disc-and-doughnut column. Uranium extraction phase-equilibrium data were fitted with the Langmuir model. Using the industrial column dimensions, operational parameters, physical properties, and the Langmuir parameters, the axial-dispersion model was shown to predict the organic-phase outlet concentration and the aqueous-phase outlet concentration, respectively, while the plug-flow model exhibited a poorer predictive ability.,     

Experimental Investigation and CFD Modeling of Hydrodynamic Parameters in a Pulsed Packed Column

In this work, a combination of computational fluid dynamics (CFD) and droplet population-balance model (DPBM) in the framework of Fluent was applied to simulate the drop-size distributions and flow fields in a pilot-plant liquid–liquid extraction pulsed packed column. The three-dimensional unsteady-state liquid–liquid flow was modeled using the Eulerian two-fluid equations in conjunction with the realizable k – ε turbulence model. The classes method (CM) was chosen for solving population-balance equations. Two models for breakage and coalescence, the models of Luo and Garthe, were used in the CFD code. The model was validated by comparing the simulated drop-size distributions and holdup with experimental measurements. After the validation of the model, the effects of the operating conditions (feed rates and pulsation) on the dispersed phase holdup and drop-size distributions were studied. The results of linked CFD-DPBM model and experiments revealed that the dispersed phase holdup was increased when the organic and aqueous flow rates increased and when the intensity of pulse was increased, the holdup increased. Increasing the dispersed and continuous feed rates caused the Sauter mean diameter of the drops decreased and when the intensity of pulse was increased, because of high droplets break up rate, the Sauter mean diameter decreased. Results of linked CFD-DPBM model show that the CFD-DPBM tool is able to predict hydrodynamic parameters in a pulsed packed column.     

脉冲筛板萃取柱中传质过程的研究

在内径40mm实验脉冲筛板柱中,用30%磷酸三丁酯-硝酸-水体系测定了各种操作条件下两相稳态传质浓度剖面、液滴直径分布和分散相体积分数.根据多级返流模型拟合实际浓度剖面推算得到真实的体积传质系数K_(oDa)和两相返混参数,并进而计算出相际传质系数K_(oD).对标准板和分散-聚合型板两种柱结构内的传质过程进行了分析和讨论.研究结果表明,在本实验范围内,脉冲筛板柱内相际传质系数可按单液滴湍流内循环传质模型来预测.     

脉冲筛板萃取柱中两相流体力学的研究

汪家鼎、沈忠耀等曾在1963年提出了脉冲筛板萃取柱中两相流体流动特性的基本关联式:V_d/x+V_c/（1-x）=V_o（1-x）~n。在内径为25mm标准板结构的玻璃柱中测得煤油～水体系的方程指数n=2.2±0.2。并推断n应为两相体系物性的函数。本文是以上工作的继续和深入。研究中采用了四种体系。在各种操作条件下对式中的参数n、V_o与体系物性及分散相液滴平均直径D（3,2）之间的关系进行了探讨。得到了按体系物性和操作参数计算D（3,2）、n和V_o的半经验关联式。利用这些关联式计算的液泛流速与实测值相比,绝大多数误差在±15％以内。