Reaction/Coagulation Dynamics in a Continuous Emulsion Polymerization Process of Vinyl Acetate
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- Ohmura Naoto
- Department of Chemical Science and Engineering, Kobe University
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- Zenitani Yuka
- Department of Chemical Science and Engineering, Kobe University
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- Nagata Koudai
- Graduate School of Science and Technology, Kobe University
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- Kumagai Norihisa
- Department of Chemical Science and Engineering, Kobe University
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- Takigawa Teiji
- Eisai Co., Ltd.
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- Imakoma Hironobu
- Department of Chemical Science and Engineering, Kobe University
Bibliographic Information
- Other Title
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- 酢酸ビニルの連続乳化重合の反応・凝集ダイナミックス
- サクサン ビニル ノ レンゾク ニュウカ ジュウゴウ ノ ハンノウ ギョウシュウ ダイナミックス
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Abstract
The present work investigated the effect of mixing and pH of solution on latex particle coagulation from the aspect of process intensification. Experiments were conducted in a CSTR under conditions below the critical micelle concentration of emulsifier in order to reduce emulsifier consumption. When the rotational number of a 2-bladed impeller of half-moon shape was varied as a control parameter, the reaction state depended on mixing below 200 rpm. Under these mixing conditions, the monomer conversion was low and particle coagulation was suppressed. On the other hand, at above 200 rpm the reaction state was controlled by polymerization reaction, and high monomer conversion was obtained irrespective of the rotational number of impeller. These mixing conditions enhanced particle coagulation, and larger particles were obtained. When pH of solution was varied as the other control parameter, higher pH values (pH=6 and 7) enhanced particle coagulation, the mean particle size increased up to 3 μm with time and particles of larger than 10 μm were observed in the sample obtained at the maximum mean particle size. Under these conditions, a bimodal particle size distribution was obtained in the process of particle growth to the maximum mean diameter, while a mono-dispersed distribution was obtained in the process of decreasing mean particle size from the maximum value.
Journal
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- KAGAKU KOGAKU RONBUNSHU
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KAGAKU KOGAKU RONBUNSHU 34 (1), 125-129, 2008
The Society of Chemical Engineers, Japan
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Keywords
Details 詳細情報について
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- CRID
- 1390282679485814016
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- NII Article ID
- 10020123153
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- NII Book ID
- AN00037234
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- ISSN
- 13499203
- 0386216X
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- NDL BIB ID
- 9359398
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed