高分子膜製造における不純物除去促進を目的とした多成分溶液乾燥のモデリング

多组分溶液干燥建模以促进聚合物膜制造中的杂质去除

• 批准号: 05750671
• 负责人: 吉田 正道
• 金额: $ 0.45万
• 依托单位: University of Toyama
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Encouragement of Young Scientists (A)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 无数据
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05750671/
• 关键词: 多成分乾燥; 高分子溶液; 乾燥促進; 乾燥工学

本研究では、高分子-揮発性溶媒-不純物の3成分高分子溶液のモデルとしてポリスチレン-エチルベンゼン-トルエン系を使用し、乾燥実験を行った。実験では試料質量の経時変化より溶液全体の乾燥速度を求め、さらにガスクロマトグラフィーにより溶液中の各成分の濃度の経時変化を測定し、各成分の乾燥速度を求めた。この結果より膜厚、および初期組成が乾燥速度などに及ぼす影響を検討し、以下の知見を得た。膜厚5mmの場合、初期組成の違いによらず乾燥速度は乾燥開始後しばらくして急激な低下を示し、乾燥速度曲線に折れ曲がりが生じる。折れ曲がりが起こる時刻は溶媒の表面濃度が零となる時点と一致することが数値計算により判明し、この時点で乾燥速度を支配する因子が境膜抵抗から内部拡散抵抗へと移行していることが明らかとなった。膜厚1mmの場合もそれほど顕著ではないが同様の傾向が見られた。また溶媒(エチルベンゼン-トルエン)の初期組成を変化させた場合、膜厚によらず、境膜抵抗支配期間の乾燥速度はFlory-Huggins式より求めた初期蒸気圧との間に相関があるが、全体の乾燥時間を決定づける内部抵抗支配期間の乾燥速度に対しては初期蒸気圧の間に何ら相関性は見いだせない。このことから一概に初期組成における溶媒の蒸気圧を高くすることが乾燥時間の短縮につながるとは言えないことが明らかとなった。さらに高分子溶液の組成変化よりエチルベンゼンとトルエンの乾燥選択性を検討したところ、ポリスチレンを含まない場合と大略類似した傾向を示すものの、乾燥が境膜抵抗支配から内部抵抗支配へ移行する前後で選択性に変化の生じることが判明した。

In this study, the three-component polymer solution of polymer-volatile solvent-impurities was used and dried. To determine the time variation of the sample mass, determine the drying rate of the solution as a whole, determine the time variation of the concentration of each component in the solution, and determine the drying rate of each component. The results show that the film thickness, initial composition, drying rate and drying time are affected by the film thickness and initial composition. When the film thickness is 5 mm, the drying rate decreases rapidly after the initial composition starts, and the drying rate curve bends. The time when the solvent surface concentration changes from zero to zero is consistent with the time when the solvent surface concentration changes from zero to zero. The time when the solvent surface concentration changes from zero to zero is consistent with the time when the solvent surface concentration changes from zero to zero. The time when the solvent surface concentration changes from zero to zero is consistent with the time when the solvent surface concentration changes from zero to zero. The time when the solvent surface concentration changes from zero to zero is consistent with the time when the solvent surface concentration changes from zero to zero. The time when the solvent surface concentration changes from zero to zero is consistent with the time when the solvent surface concentration changes from zero to zero is consistent with the time when the solvent surface concentration changes from zero to zero. The time when the solvent surface concentration changes from zero to zero is consistent with the time when the solvent surface concentration changes from zero to zero is consistent with the time when the solvent surface concentration changes from zero to zero is consistent with the time when the solvent surface concentration changes from zero to zero. The time when the solvent surface concentration changes from zero to zero is consistent with the time when the solvent surface concentration changes from zero is consistent with the time when the solvent surface concentration changes from When the film thickness is 1 mm, it tends to be the same. When the initial composition of the solvent changes, the film thickness changes, and the drying rate during the control period of the environmental film resistance changes, the Flory-Huggins equation is used to calculate the correlation between the initial vapor pressure and the drying rate during the control period of the internal resistance. The initial composition of the solvent is high, and the drying time is short. The composition of polymer solution is different from that of dry polymer solution. The dry polymer solution is different from dry polymer solution. The dry polymer solution is different from dry polymer solution. The dry polymer solution is different from dry polymer solution. The dry polymer solution is different from dry polymer solution.