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液-液混合澄清萃取器的研究动态与发展方向 总被引:1,自引:0,他引:1
傅爱华 《化学工业与工程技术》2004,25(4):9-11
介绍了传统萃取设备的主要特点和各种型式。综述了新型结构的塔式混合澄清萃取器的研究与应用状况 ,提出了塔式混合澄清萃取器的不足及发展方向 相似文献
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液-液喷射混合装置具有优异的微观混合特性,特别适用于液-液快反应体系。在研究不同液-液喷射混合装置的微观混合特性时,选取合适的研究方法和定量指标非常关键。本文对比分析了液-液喷射混合装置中常用的微观混合特性研究方法(化学探针法、激光诱导荧光技术和计算流体力学方法),包括其优缺点、适用范围、选用原则和应用要点,并总结了表征微观混合特性的定量指标。其次,对液-液喷射混合装置进行了系统性的分类,分别介绍了不同液-液喷射混合装置中微观混合特性的影响因素和研究进展,后者主要包括3种研究方法在研究微观混合机理、微观混合特性时间、微观混合过程强化和装置结构优化等方面的进展。最后总结了罐中喷射混合装置和管状喷射混合装置微观混合特性研究存在的不足和后续研究方向。 相似文献
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如果不从节省能耗的观点出发.宁愿选用液压式注射机.原因在于动态液压油蓄能器对控制注射机的注射速度和质量十分关键,意大利BMB公司设计了新型Elepack系列电动注射机。这些新的系列设备对上述问题采用新的解决方法,其中注射阶段仍用液压系 相似文献
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采用改进的化学偶合法研究液-液相的宏观混合与微观混合,研究了搅拌转速、加料速度与位置等操作条件以及桨型对分隔指数的影响。 相似文献
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S HashimB.W Brooks 《Chemical engineering science》2002,57(17):3703-3714
In suspension polymerisation, monomer is suspended as liquid droplets in a continuous water phase by means of strong agitation and the presence of a suspending agent. As the suspension polymerisation proceeds, the viscosity of a monomer-polymer droplet increases with conversion. Hence, the physical behaviour of the droplet changes during the process. When new dispersible material is added to the existing suspension drops, the new material and existing drops can remain segregated for significant amounts of time. The aim of this project was to study the behaviour of drop mixing when new material is added to the existing suspension polymerisation. This study concentrated on the effect of the dispersed phase viscosity on drop mixing. The results show that viscosity affects drop size and that may then affect the rate of coalescence between drops. A critical drop size exists which determines the coalescence efficiency effect. Above the critical drop size, mixing rate increases as the drop viscosity decreases. While below the critical drop size, drop size of the dispersion determines the coalescence rate; as the drop size increases, coalescence rate also increases. The investigation of the effect of suspending agent shows that Tween 20 is more efficient in stabilising and protecting the drops, based on a weight basis, than PVA as the coalescence rate is lower with Tween 20. 相似文献
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介绍了有关射流混合设备内混合时间的实验研究进展,概述了计算流体力学(CFD)技术在射流混合设备内流场结构演化和混合效率评价中的应用,总结了不同研究者提出的混合时间关联式。分析影响射流混合效率的参数发现:混合时间随着混合槽直径的增加而增加,并与混合槽的高度呈正比;射流速度的增加可有效地降低混合时间;射流喷嘴的最佳直径与形状由混合槽的具体结构决定,但其最佳位置取决于混合槽高度与直径的比值;多股对置射流明显地提高混合效率。最后指出将CFD方法与压力波动信号(PFS)、PIV和PLIF等实验方法相结合可有效地推进射流强化混合机理研究和新型射流混合反应器的开发进程。 相似文献
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Chalida Niamnuy 《Chemical engineering science》2005,60(6):1701-1708
The present study investigated experimentally the effects of various geometric and operating parameters on the mixing characteristics of model liquids undergoing mixing in a novel in-line mixer, viz. an in-line impinging stream (IS) mixer. First, the mixer with one set of three inlet jets was used. Later two sets of inlet jets were used in order to increase the number of impingement zones and hence the mixing capability of the mixer. A statistical analysis was performed to indicate the best geometry of the mixer based on the data of both the mixing effectiveness and the pressure loss due to impingement of liquid streams. 相似文献
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分析了混炼设备的机型分类与对比,以及开炼机与密炼机的容量及功率比较。介绍了各种混炼设备的发展过程与现状,对比了各种混炼设备的特性、适用范围及性能参数。介绍了混炼室、转子及上下辅机的发展概况。最后展望了混炼设备的未来发展。 相似文献
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Szymon Woziwodzki Lubomira Broniarz-PressMarek Ochowiak 《Chemical Engineering Research and Design》2010
In this paper, the results of the experimental studies of the mixing time, as well as the power consumption and baffle presence in the stirred tank with dual eccentrically located impellers are presented. The experiments were carried out in an unbaffled flat-bottomed cylindrical vessel. Three types of impellers were used: Rushton turbine, six pitched blade turbine and six flat blade turbine. The obtained data show that eccentricity of dual impeller systems leads to reduction of mixing time. Moreover, the experimental data confirmed the enlargement of power consumption in such systems. In the paper the analysis of relation between eccentricity ratio and mixing time has been performed. 相似文献
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浅析炼胶设备的发展动向及特点 总被引:2,自引:0,他引:2
对常用的开炼机和密炼机及其下辅机—压片挤出机当前的发展动向和特点作了概述。开炼机目前朝着规格系列化、大型化、结构形式多样化、操作安全化的方向发展;密炼机现在由上、下辅机配套组成一条生产线,自动化、智能化的水平越来越高,文中对提高密炼机炼胶效率和炼胶质量的转子结构作了重点介绍,转子不仅向转速高速化、多极或无级化发展,而且结构形状呈多样化的发展趋势:压片挤出机目前采用更多的是压片挤出机加胶片冷却机的联动方式,平行双螺杆、斜置式平行带锥形头双螺杆和锥形双螺杆等压片挤出机,基本代表了国际目前常用的机型。 相似文献
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阐述如何在空心桨叶类搅拌设备传热面积确定的情况下,通过调节螺旋输送七要素来提高设备的输送能力,并介绍空心桨叶类搅拌设备输送量的计算方法。 相似文献