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高溫高壓反應釜的結晶

來(lái)源: 時(shí)間:2013-10-10 14:44:24 瀏覽次數:

高溫高壓反應釜內每個(gè)存在著(zhù)的晶體由于溶質(zhì)分子在其表面上的逐步沉積而變大的過(guò)程稱(chēng)為結晶。這種過(guò)程在形式上非常類(lèi)似于已經(jīng)討論過(guò)的縮聚反應過(guò)程,和聚合物分子童分布相類(lèi)似的現象是結晶軟粒大小的分布。
高溫高壓反應釜內每個(gè)存在著(zhù)的晶體由于溶質(zhì)分子在其表面上的逐步沉積而變大的過(guò)程稱(chēng)為結晶。這種過(guò)程在形式上非常類(lèi)似于已經(jīng)討論過(guò)的縮聚反應過(guò)程,和聚合物分子童分布相類(lèi)似的現象是結晶軟粒大小的分布。所以可以認為不論是在連續攪拌槽,內或者在間歇或管式系統內進(jìn)行結晶,可以由粗度分布這個(gè)重要差別表示其特征.
例如,在一個(gè)連續攪拌摘式的系統內進(jìn)行結晶,進(jìn)料洛液進(jìn)入串聯(lián)的第一個(gè)摘,并且為了使晶體保持在懸浮狀態(tài),氣槽都有充分的攪拌。
在每一箱內進(jìn)行二種過(guò)程,(a)形成新的晶核,(b)晶核長(cháng)大形成一定大小的晶體。由此可知,在離開(kāi)第茱槽液體懸浮液中的結晶物質(zhì)由二部分組成,(a)在這個(gè)槽內生成的新的晶體和(b)在前面槽內生成的老的晶體,這老晶體在槽內僅僅是逐漸長(cháng)大。由于考慮了這些因素,并且采用核晶形成和結晶長(cháng)大速率的適當表達式,因此就可能建立所得結晶產(chǎn)物的順拉大小分布的理論.
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