Construction of a Concept on Instabilities and Fluctuations of Complex Systems of Chemical Processes

复杂化学过程系统的不稳定性和波动概念的构建

• 批准号: 09450287
• 负责人: KATAOKA Kunio
• 金额: $ 5.5万
• 依托单位: Kobe University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450287/
• 关键词: Reaction Instability; Coupling of Complex Systems; Nonlinear Phenomena; Chemical Oscillation; Continuous Flow Reactor; Belousov-Zhabotinskii Reaction; Emulsion Polymerization; 連続乳化重合; 反応プロセス; 化学振動; 不安定性; 複雑系; 分岐特性; 混合・拡散; ゆらぎ

This research has been made in order to construct a new concept of emergent synthesis and introduce it into the methodology for designing complex systems of chemical processes. Belousov-Zhabotinskii reaction and emulsion polymerization of vinyl acetate were conducted in two kinds of continuous flow reactor : continuous stirred tank reactor (CSTR) and Taylor vortex flow reactor (TVFR).(1) A peculiar bifurcation scenario of chemical oscillations which has a window of chaotic intermittency between the singly-periodic and the chaotic oscillations has been confirmed in the BZ reaction conducted in CSTRs.(2) The characteristics of streamwise propagation of chemical oscillations were successfully observed in the BZ reaction in a TVFR.It has been found that some irregularity or quasi-periodicity appears at the entrance region owing to nonlinear coupling between the inherent oscillation of the TVFR and the input of forced oscillation supplied from the CSTR used as a pre-reactor. In the downstream region, the unstable chemical oscillations are attenuated to become regular singly-periodic oscillation.(3) The continuous emulsion polymerization of vinyl acetate showed chemical oscillations under the feed condition of emulsifier giving low concentration below CMC in the aqueous phase. The process of homogeneous nucleation and growth of primary particles and the process of agglomeration of primary particles occurred alternately. This suggests a possibility of controlling the size distribution.

本研究旨在构建一种新的应急综合概念，并将其引入到设计复杂化工过程系统的方法论中。在连续搅拌釜式反应器(CSTR)和泰勒涡流反应器(TVFR)两种连续流动反应器中进行了乙酸乙烯酯的Belousov-Zhabotinskii反应和乳液聚合反应。(1)在连续搅拌釜式反应器中进行的BZ反应中，由于固有振荡之间的非线性耦合，在入口区出现了一些不规则或准周期的化学振荡现象，在单周期振荡和混沌振荡之间存在混沌间歇窗口。(2)在连续搅拌釜式反应器中，成功地观察到了化学振荡的流向传播特征作为前置电抗器的CSTR提供的TVFR和强迫振荡输入。在下游区域，不稳定的化学振荡被衰减为规则的单周期振荡。(3)在乳化剂浓度低于水相CMC的条件下，醋酸乙烯酯连续乳液聚合表现出化学振荡。初生颗粒的均匀形核长大过程和初生颗粒的团聚过程交替发生。这表明有可能控制尺寸分布。

项目成果

K.Kataoka: "New Aspects of Instabilities and Their Bifurcation in Transport Phenomenawith/without Chemical Reactions" Proc.CHEMECA'98,Sept.28-30,Port Douglas,Australia. KeynoteCD-ROM. 1-20 (1998)

K.Kataoka：“有/无化学反应的运输现象中的不稳定性及其分岔的新方面”Proc.CHEMECA98，9 月 28-30 日，澳大利亚道格拉斯港。

N.Ohmura, K.Kataoka, S.Watanabe and M.Okubo: "Controlling Particle Size by Self-Sustained Oscillations in Continuous Emulsion Polymerization of Vinyl Acetate" Chem.Eng.Sci.53 (12). 2129-2135 (1998)

N.Ohmura、K.Kataoka、S.Watanabe 和 M.Okubo：“通过醋酸乙烯连续乳液聚合中的自持续振荡控制粒径”Chem.Eng.Sci.53 (12)。

N.Ohmura: "Analysis of Orderliness in Higher Instabilities to the Occurrence of Chaos in a Taylor-Couerre Flow System" Proc.9th Int.Symp.on Application of Laser Techniques to Fluid Mechanics,Jily 13-16,Lisbon,Portugal. 1. 451-458 (1998)

N.Ohmura：“Taylor-Couerre 流动系统中较高不稳定性对混沌发生的有序性分析”Proc.9th Int.Symp.on 激光技术在流体力学中的应用，Jily 13-16，里斯本，葡萄牙。

N.Ohmura: "Electrochemical Potential Oscillations of Autocatalytic Acetone-Glucose System in Axially-Moving Taylor Vortices" Proc.Int.Symp.on Transport Phenomena in Thermal Science & Process Engineering,Nov.30-Dec.3,Kyoto. 1. 139-144 (1997)

N.Ohmura：“轴向移动泰勒涡旋中自催化丙酮-葡萄糖系统的电化学势振荡”Proc.Int.Symp.on 热科学中的传输现象

N.Ohmura, K.Kataoka, D.Shindo and H.Seno: "Electrochemical Potential Oscillations of Autocatalytic Acetone-Glucose System in Axially-Moving Taylor Vortices" Proc.Proc.Int.Symp.On Transport Phenomena in Thermal Science and Process Engineering, Nov.30-Dec.3

N.Ohmura、K.Kataoka、D.Shindo 和 H.Seno：“轴向移动泰勒涡旋中自催化丙酮-葡萄糖系统的电化学势振荡”Proc.Proc.Int.Symp.On 热科学和过程工程中的传输现象