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實驗過程中攪拌的目的

來源: 時間:2012-12-13 14:50:17 瀏覽次數:

以液體為主體的攪拌操作,常常將被攪物料分為液-液、氣-液、固-液、氣-液-固等四種情況。攪拌既可以是一種獨立的流體力學范疇的單元操作,以促進混合為主要目的,如進行液-液混合、固-液懸浮、氣-液分散、液-液乳化等
以液體為主體的攪拌操作,常常將被攪物料分為液-液、氣-液、固-液、氣-液-固等四種情況。攪拌既可以是一種獨立的流體力學范疇的單元操作,以促進混合為主要目的,如進行液-液混合、固-液懸浮、氣-液分散、液-液乳化等;又往往是完成其他單元操作的必要手段,以促進傳熱、傳質、化學反應為主要目的,如進行流體的加熱與冷卻、萃取、吸收、溶解、結晶、聚合等操作。
概括起來,攪拌設備的操作目的主要表現為以下四個方面:
(1)    使不互溶液體混合均勻,制備均勻混合液、乳化液,強化傳質過程;
(2)    使氣體在液體中充分分散,強化傳質或化學反應;
(3)    制備均勻懸浮液,促使固體加速溶解、萃取或液-固化學反應;
(4)    強化傳熱,防止局部過熱或過冷。
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