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逗留時(shí)問(wèn)分布對反應釜收率的影響

來(lái)源: 時(shí)間:2013-10-09 14:44:04 瀏覽次數:

由子在大多數情況下,等溫反應的速率隨轉化率的增加而下降,所以一般在等溫實(shí)驗室反應釜中,由于某些物料的逗留時(shí)間比平均逗留時(shí)間長(cháng),而導致轉化率的增加并不能補償某些物料在反應a中逗留時(shí)間比平均逗留時(shí)間短而造成產(chǎn)物的損失。
由子在大多數情況下,等溫反應的速率隨轉化率的增加而下降,所以一般在等溫實(shí)驗室反應釜中,由于某些物料的逗留時(shí)間比平均逗留時(shí)間長(cháng),而導致轉化率的增加并不能補償某些物料在反應a中逗留時(shí)間比平均逗留時(shí)間短而造成產(chǎn)物的損失。因此,逗留時(shí)間的分布通常將使實(shí)驗室反應釜性能比活塞流反應器差?,F在的間題是研究其差多少?
對一級反應來(lái)說(shuō),反應物的轉化率井不取決于它的初始濃度。因此,假如把具有不同濃度的兩種反應流體混合在一起,經(jīng)過(guò)一定時(shí)間后,其反應所生成的產(chǎn)物總量和這兩體積流體分別單獨反應時(shí)所得的產(chǎn)物量相同。這點(diǎn)僅對一級反應是正確的。假如反應速率比一級反應動(dòng)力學(xué)更多地取決于反應物的濃度(指級數大于一),則把兩種流體混和,因一種流體被另一種所稀釋?zhuān)试谝欢〞r(shí)間內,反應所生成的產(chǎn)物總量就降低。相反,如果反應級數小于一級,反應產(chǎn)物將由于這種混和而增加。
因面,實(shí)驗室反應釜的性能一般將取決于器內不同濃度流體微元之間的棍和。此外,還取決于發(fā)生這種混和相對于平均逗留時(shí)間是早些或晚些。遺診的是,逗留時(shí)間分布本身并不熊為地計算這種影響的大小而提供充分的數據。例題5.6指出,兩種不同的流動(dòng)系統能得到相同的逗留時(shí)間分布,但對不同于一級反應動(dòng)力學(xué)的反應來(lái)說(shuō),就不能得到與此相同的實(shí)驗室反應釜性能.
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