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連續攪拌不銹鋼反應釜

來(lái)源: 時(shí)間:2013-11-11 09:05:44 瀏覽次數:

這種反應器是一個(gè)充分攪拌的不銹鋼反應釜,反應原料連續流入不銹鋼反應釜,(部分地)反應了的產(chǎn)物則連續地從釜中排出。由于這種反應器的形狀大多是矮而大的(例如寬度與高度根同的筒形容器),
這種反應器是一個(gè)充分攪拌的不銹鋼反應釜,反應原料連續流入不銹鋼反應釜,(部分地)反應了的產(chǎn)物則連續地從釜中排出。由于這種反應器的形狀大多是矮而大的(例如寬度與高度根同的筒形容器),故必須使其中的物料攪拌良好,否則,在進(jìn)口與出口之間,就可能會(huì )出現流體的短路流動(dòng),而使反應器的’大里容積基本上成為死角。
連續攪拌釜式反應器的重要特征是攪拌。對其性能恰當的初步近似估算,是墓于這樣的假設,即反應器內的物料完全混和,從而流出料液和器內的物料具有相同的組成,這是連續攪拌釜式反應器和管式反應器之間的重要區別。
只耍流休不太枯,完全混和這一近似假定,在連續攪拌釜式反應器內并不難達到。一般說(shuō)來(lái),若注入一物料徽元(如注射入染料);當它比物料在釜內的平均逗留時(shí)間短得多的時(shí)間內就能在釜內均勻分布時(shí),該不銹鋼反應釜就可認為是“完全.棍和.的。
以后還可以看到,把幾個(gè)連續攪拌釜式反應器申聯(lián)起來(lái),使反應物料從一個(gè)釜流向下,個(gè)釜,這樣傲常是有利的。其結果是使料液的組成自一個(gè)釜到一個(gè)釜發(fā)生逐級的變化。但這亦會(huì )引起短路流失:即某一分子“進(jìn)入不銹鋼反應釜,有相當的機率,幾乎立即竄入出口的液流中去。這也就是為什么通常需要把幾個(gè)不銹鋼反應釜串聯(lián)使用的緣故,尤其在需要獲得高轉化率時(shí)。俏若只有一個(gè)或兩個(gè)不銹鋼反應釜,未反應物料的流失就會(huì )很可觀(guān)。雖然從某種意義上說(shuō),這種流失是攪拌的結果,但是,如果沒(méi)有攏拌的話(huà),則由于進(jìn)口與出口間的主體物料流動(dòng),通常將會(huì )有更多的流失。
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