Meso-mixing effects on demulsification in froth treatment: mechanisms and modeling

泡沫处理中介观混合对破乳的影响：机制和模型

• 批准号: 485319-2015
• 负责人: Kresta, Suzanne
• 金额: $ 6.34万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=656000
• 关键词: Meso; mixing; effects; demulsification; froth

All of Chemical Engineering can be broken into three basic steps: mixing, reaction, and separations. While reaction and separations have been extensively studied for centuries, the (technical) mixing literature only begins in the 1950's. For decades, we have taught students that processes are "well mixed" - but a technical and comprehensive definition of what we mean by well mixed only appeared in 2009 (Kukukova et al.)****Mixing is frequently simple or ideal, but when it appears as a problem it is often elusive - appearing in one set of experiments and disappearing in other apparently similar work. There are two reasons for this: first, well defined mixing test cells have only recently been developed, and second, mixing is most frequently a competing rate process - it has strong interactions with other variables and cannot be considered in isolation.****In this proposal, the initial stages of mixing additive into diluted bitumen froth are to be explored. In this process, if the additive is injected at a high concentration with poor mixing, clean up of the froth before processing is very difficult. If this additive is prediluted and mixed vigorously at the point of injection, the chemical use can be cut in half while achieving the same separation. This is a classical mesomixing problem, indicating that high local concentrations at the feed point are changing the chemical action taken by the demulsifier additive.****New experimental tools allow us to look into the feed plume to see what is happening and determine the fate of the demulsifier. This is the first time in-situ measurements will be possible in real time.**

所有化学工程都可以分为三个基本步骤：混合、反应和分离。虽然反应和分离已经被广泛研究了几个世纪，但（技术）混合文献直到 20 世纪 50 年代才开始。几十年来，我们一直在教导学生过程是“充分混合的”——但对“充分混合”的技术和全面的定义直到 2009 年才出现（Kukukova 等人）****混合通常是简单或理想的，但当它作为一个问题出现时，它通常是难以捉摸的——出现在一组实验中，并在其他明显相似的工作中消失。造成这种情况的原因有两个：首先，明确的混合测试单元最近才被开发出来，其次，混合最常见的是一个竞争速率过程 - 它与其他变量有很强的相互作用，不能孤立地考虑。****在本提案中，将探索将添加剂混合到稀释沥青泡沫中的初始阶段。在此过程中，如果添加剂以高浓度注入且混合不良，则在加工前清除泡沫是非常困难的。如果这种添加剂在注射时进行预稀释和剧烈混合，则化学品的使用量可以减少一半，同时实现相同的分离效果。这是一个经典的介观混合问题，表明进料点的高局部浓度正在改变破乳剂添加剂所采取的化学作用。****新的实验工具使我们能够观察进料羽流，看看发生了什么并确定破乳剂的命运。这是第一次可以进行实时现场测量。**