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連串反應或降解反應

來(lái)源: 時(shí)間:2013-11-04 16:47:02 瀏覽次數:

我們考慮的反應型式為A-X-Y(一Z-+),這里需要的產(chǎn)物是物質(zhì)X,而Y等都是不需要的,X轉變成Y是一種“降解反應”,這在有機化學(xué)中是普追的情況。例如,通常發(fā)生在苯生成抓苯、硝基苯等的生產(chǎn)中,其中有形成二取代化合物和三取代化合物的趨向。
我們考慮的反應型式為A-X-Y(一Z-+),這里需要的產(chǎn)物是物質(zhì)X,而Y等都是不需要的,X轉變成Y是一種“降解反應”,這在有機化學(xué)中是普追的情況。例如,通常發(fā)生在苯生成抓苯、硝基苯等的生產(chǎn)中,其中有形成二取代化合物和三取代化合物的趨向。
非取代型降解反應的一個(gè)重要例子是甲醇氧化為甲醛,這里有用的產(chǎn)物會(huì )進(jìn)一步反應得到CO2:CH3OH-->HCILO-- CO2
如果我們考慮一個(gè)間歇高溫高壓反應釜,開(kāi)始時(shí)加入A,顯然在某,個(gè)時(shí)間t時(shí),所需要的產(chǎn)物濃度將通過(guò)一個(gè)值,也就是說(shuō),當反應時(shí)間便之等于t時(shí),一定的A分子轉變成X分子(不是Yj是。所以相對于加入系統的反應物的量來(lái)說(shuō),為了得到X的收率,反應過(guò)程應有一個(gè)不太長(cháng)也不太短的持續時(shí)間.
對型式的連續高溫高壓反應釜,必然有一個(gè)逗留時(shí)間分布。因此即使平均逗留時(shí)間可以取其等于t,但通過(guò)系統的各流體微元所具有的逗留時(shí)間有的比時(shí)間大、有的比時(shí)間小。在前一章內我們已看到,單是逗留時(shí)間分布尸般并不足以確定轉化率,但是式可能被用來(lái)近似地表明逗留時(shí)間分布的影響。這樣一種分布,通常將降低中間產(chǎn)物X所能得到的收率。
顯然,十分接近于活塞流的管式高溫高壓反應釜,所得到的收率不會(huì )比間歇高溫高壓反應釜的收率低很多,并且,這種管式高溫高壓反應釜在實(shí)際上,應用于以銀為催化劑的甲醇氧化、氯乙烷的生產(chǎn)等等許多降解型的反應。
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