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填充物和流體間的傳質(zhì)

來(lái)源: 時(shí)間:2013-12-06 09:22:59 瀏覽次數:

從填充床不銹鋼反應釜得到產(chǎn)物,通常均考慮是墓于以下步驟的緒果.(i)反應物從流體相到催化劑墳充物外表面的傳質(zhì)。(ii)擴散進(jìn)入催化劑順粒的徽孔內。
從填充床不銹鋼反應釜得到產(chǎn)物,通常均考慮是墓于以下步驟的緒果.
(i)反應物從流體相到催化劑墳充物外表面的傳質(zhì)。
(ii)擴散進(jìn)入催化劑順粒的徽孔內。
(iii)在催化荊表面上吸附。
(iv)在表面上反應。
(v)產(chǎn)物從催化劑表面上解吸。
(vi).產(chǎn)物從催化劑順粒的微孔內擴散出來(lái)。
(vii)產(chǎn)物到流體相的傳質(zhì)。
其中e為床層空隙率。各種填充床中的空隙率e的值相差不是很大,而坡充床和聚式流化床的實(shí)臉結果得出A=0.818e,其中空晾率e有較寬的范圍。如果空晾率在。.4左右,這些A值間的差異是很小的,對我們而言其差異是可以忽略不計的。所考慮到的Sh的實(shí)驗結果,除一組例外,
對Re數適用范圈大約從0.5到1000, Sh數值聚集在理論線(xiàn)士20%之內。例外的一組在高的Sc數,其Sh數值也相當高。
形式和氣膜控制下潤濕填充塔的氣體吸收的關(guān)聯(lián)式相類(lèi)似,這是并不令人意外的,雖然后者常用的Re數的次方比1/2大。對于不銹鋼反應釜的設計.能用于估算反應物能夠擴散到催化荊順粒外表面的速度,而這表示了反應速度的上限。
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