泥状物質乾燥の研究  [in Japanese] Drying of Pasty Materials  [in Japanese]

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Abstract

われわれはさきに染料の乾燥を行いその機構を調べ,また攪拌乾燥器を製作して乾燥時間を現在の1/10に短縮した。さらに廣く泥状物質の乾燥特性を追究するため,アミノ酸醤油,シアン醋酸ソーダおよびベントナイトを擔体とする酸化トリュウム觸媒の乾燥を行つた。<BR>乾燥速度は表面水の蒸發する恒率期間に續いて急激に低下するが後再び上昇する。これは恒率期間直後は材料の粘稠性が張いため水分擴散が困難なことによるが,乾燥が進むにつれて材料の状態が變化して次第に多孔性化し,乾燥面績も増加して再び乾燥速度が上昇する。以後は一般固体の乾燥と同樣である。Ernstの説は承服できない。溝型攪拌乾燥器の使用によつて上記の材料の乾燥時間を遙かに短縮しまた操作を簡單にすることができた。

Lately we reported about the drying mechanism of dyestuff and the drying method using the trough agitator dryer.<BR>To study the general drying mechanism of pasty materials, we have further dried powdered "SHOYU", CH<SUB>2</SUB>CNCOOH and ThO<SUB>2</SUB> catalyser using bentnite as carrier.<BR>After the constant drying rate period, the drying rate falls rapidly, but rises again as the drying proceeds on. Because after the constant rate period, pasty materials are so viscous that the water diffusion is difficult, but as the further proceeding of drying, the state of the material changes and becomes porous, so it is seemed that the water transfer becomes more easily and the drying rate rises again. After that period, the drying mechanism is similar to the drying of solids in general. We can not accept the theory of Ernst.<BR>By the use of through agitator dryer, drying of pasty materials has become far quick and simple.

Journal

  • The chemical machinerey

    The chemical machinerey 14(3), 101-104, 1950

    The Society of Chemical Engineers, Japan

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