Fine Bubbles for Biocatalytic Processes

用于生物催化过程的细小气泡

• 批准号: 322785574
• 负责人: Professor Dr. Andreas Liese
• 金额: --
• 依托单位: Institut für Technische Biokatalyse V-6
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/322785574?language=en
• 关键词: Fine; Bubbles; Biocatalytic; Processes

The rising demand in process engineering for aeration with high mass transfer performance with low pressure drop, low shear stress and avoidance of foaming opens an interesting field for new technologies. One possibility to achieve these goals is the aeration with fine bubbles whose diameter is less than 100 micrometers. In Japan, many applications of fine bubbles can be found and several companies have been established that are offering fine bubble generators (FBG) and analyzing devices for fine bubbles. In 2013, the technical committee for Fine Bubble Technologies (FBT) was established and approved by the Organization for Standardization (ISO). In Germany fine bubbles are known at the most in connection with flotation processes but their potential for mass transfer in two phase flows has not been addressed so far. Especially the question of physical properties and effectiveness has not been answered satisfactorily. Several authors are reporting a lifetime of fine bubbles in the range of several weeks and months, which is much longer than the predicted one. This effect is discussed very contradictorily and attributed to contaminations or surface charging. Nevertheless, the introduction of small-sized bubbles leads to large volume-specific interfacial areas and therefore to high mass transfer rates. The strong collaboration between Germany and Japan in the field of Multiscale Multiphase Process Engineering (MMPE joint conferences 2011 and 2014, supported by the DFG) provides a unique possibility to intensively exchange knowledge about fine bubbles and its applications between Germany and Japan and enables efficient research in this emerging field of technology. This project is intended to investigate the potential of fine bubbles for biocatalytic processes. High mass transfer performance, negligible two-phase pressure drop and shear stress as well as the avoidance of foaming and reactant evaporation are the most promising advantages of fine bubble aeration in comparison to conventional systems. While the measurement methods of the Institute of Multiphase Flows will provide a deep insight into hydrodynamics and mass transfer processes in fine bubble two-phase flows with high temporal and spatial resolution, the reaction engineering expertise and knowledge in biocatalysis of the Institute of Technical Biocatalysis will enable the detailed investigation of the effect of fine bubbles on biocatalytic reactions in stirred tanks as well as packed bed reactors. For the transfer of knowledge, Prof. Koichi Terasaka from Keio University, Japan is intended to join the project as Mercator Fellow. Furthermore, an intensive scientific exchange of students, PhD students and professors between Keio University and TUHH will foster research between the Universities and the presentation of results at the next International Symposium of MMPE 2017 in Toyama, Japan, is intended to motivate further initiatives related to research on fine bubbles.

工艺工程对具有高传质性能、低压降、低剪切应力和避免发泡的曝气的需求不断增长，为新技术开辟了一个有趣的领域。实现这些目标的一种可能性是用直径小于100微米的细气泡曝气。在日本，可以发现许多微小气泡的应用，并且已经建立了几家公司，提供微小气泡发生器（FBG）和微小气泡分析装置。2013年，精细气泡技术（FBT）技术委员会成立，并获得标准化组织（ISO）的批准。在德国，已知的最多的是与浮选过程有关的细气泡，但是迄今为止尚未解决它们在两相流中的传质潜力。特别是物理性质和有效性的问题尚未得到满意的回答。几位作者报告了几个星期和几个月范围内的细气泡的寿命，这比预测的要长得多。这种效果被讨论非常矛盾，并归因于污染或表面充电。然而，小尺寸气泡的引入导致大的体积比界面面积，因此导致高的传质速率。德国和日本在多尺度多相过程工程领域的密切合作（MMPE联合会议2011年和2014年，由DFG支持）为德国和日本之间深入交流有关微细气泡及其应用的知识提供了独特的可能性，并使这一新兴技术领域的有效研究成为可能。本项目旨在研究微气泡在生物催化过程中的潜力。与传统系统相比，高传质性能、可忽略的两相压降和剪切应力以及避免起泡和反应物蒸发是细气泡曝气最有前途的优点。虽然多相流研究所的测量方法将提供一个深入了解流体动力学和传质过程中的细气泡两相流具有高的时间和空间分辨率，反应工程专业知识和生物催化技术生物催化研究所的生物催化知识将使细气泡的影响的详细调查生物催化反应在搅拌槽以及填充床反应器。在知识转移方面，日本庆应义塾大学的Koichi Terasaka教授将作为墨卡托研究员加入该项目。此外，庆应义塾大学和TUHH之间的学生，博士生和教授的密集科学交流将促进大学之间的研究，并在日本富山举行的MMPE 2017国际研讨会上展示结果，旨在激励与细气泡研究相关的进一步举措。