 |
 |
 |
 |
 |
 |
||
 |
 |
 |
 |
 |
| 1 | 1/1 | 返回列表 |
| 查看: 331 | 回復(fù): 0 | ||
[求助]
求翻譯，謝謝，站內(nèi)信求大神幫忙
|
|
t r = C 0 /r(C 0 ) and t d = D s /(k SL ) 2 , where C 0 is the substrate con-centration in bulk organic phase (mol cm −3 ), r(C 0 ) is the rate of reaction (mol cm −3 s −1 ), D s is the diffusivity of substrate in organicphase (cm 2 s −1 ) and k SL is the solid–liquid mass transfer coefficient in organic phase (cm s −1 ). C 0 and r(C 0 ) could be obtained from the experimental results. The Sherwood number is also useful to determine mass transfer coefficient and thus k SL = 2D s /d p ,where d p is the diameter of the support particle. If t r is greater than t d , it means that the reaction is not influenced by the mass transfer resistance . The Shiebel equation plays an important role to determine the diffusivity of the substrate in organic solvent. It was seenthat when C 0 was 0.2 × 10 −3 mol cm −3 , r(C 0 ) was 9.0 × 10 −7 mol cm −3 s −1 . Diffusivity of 2-(ethylamino)-ethanol in 1,4-dioxane was calculated as 1.07 × 10 −5 cm 2 s −1 . As the particle size of catalyst ranged in between 0.03 and 0.09 cm, the average diameter of the support particle was considered as 0.06 cm. The value of k SL = 3.56 × 10 −4 cm s −1 was calculated from the Sherwood number correlation. Using these results, t r and t d , were calculated as 222 s and 84 s respectively, which indicated that t r is greater than t d . Thus, the reaction was kinetically controlled. In another case it was equally important to compare the substrate diffusion rate per unit interfacial area (k SL C 0 ) with reaction rate per unit area ϕr(C 0 )/a. ϕ represents the phase volume ratio and a is interfacial area per volume of organic phase. As the catalyst particles are spherical, ϕ/a = R/3, here R is the radius of the particle, which was 0.03 cm as mentioned earlier. From calculation k SL C 0 was found to be 7.13 × 10 −8 mol cm −2 s −1 and ϕr(C 0 )/a was found as 9.0 × 10 −9 mol cm −2 s −1 . It was observed that substrate diffusion rate per unit area is much higher compared to rate of reaction per unit area. Hence, it is evident that reaction rate is not influenced by mass transfer and intrinsic enzyme kinetics controls it. |
回復(fù)此樓» 猜你喜歡
材料求調(diào)劑
已經(jīng)有5人回復(fù)
-
354求調(diào)劑
已經(jīng)有9人回復(fù)
-
化學(xué)工程321分求調(diào)劑
已經(jīng)有22人回復(fù)
-
考研調(diào)劑
已經(jīng)有3人回復(fù)
-
326求調(diào)劑
已經(jīng)有8人回復(fù)
-
333求調(diào)劑
已經(jīng)有7人回復(fù)
-
一志愿東華大學(xué)控制學(xué)碩320求調(diào)劑
已經(jīng)有3人回復(fù)
-
考研化學(xué)學(xué)碩調(diào)劑，一志愿985
已經(jīng)有7人回復(fù)
-
0703化學(xué)調(diào)劑
已經(jīng)有15人回復(fù)
-
0703化學(xué)調(diào)劑 ，六級(jí)已過，有科研經(jīng)歷
已經(jīng)有14人回復(fù)
相關(guān)版塊跳轉(zhuǎn)
我要訂閱樓主 bxzc123 的主題更新
| 1 | 1/1 | 返回列表 |
| 最具人氣熱帖推薦 [查看全部] | 作者 | 回/看 | 最后發(fā)表 | |
|---|---|---|---|---|
|
[考研] 材料求調(diào)劑 +5 | @taotao 2026-03-21 | 5/250 |
|
|---|---|---|---|---|
|
|
[考研] 材料工程專碩 348分求調(diào)劑 +3 | 冬辭. 2026-03-17 | 5/250 |
|
|
[考研] 299求調(diào)劑 +4 | 某某某某位 2026-03-21 | 4/200 |
|
|
|
[考研] 265求調(diào)劑 +12 | 梁梁校校 2026-03-19 | 14/700 |
|
|
|
[考研] 能源材料化學(xué)課題組招收碩士研究生8-10名 +5 | 脫穎而出 2026-03-16 | 15/750 |
|
|
|
[考研] 265求調(diào)劑 +3 | Jack?k?y 2026-03-17 | 3/150 |
|
|
|
[考研] 化學(xué)求調(diào)劑 +4 | 臨澤境llllll 2026-03-17 | 5/250 |
|
|
|
[考研] 求調(diào)劑 +3 | Ma_xt 2026-03-17 | 3/150 |
|
|
|
[考研] 324分 085600材料化工求調(diào)劑 +4 | llllkkkhh 2026-03-18 | 4/200 |
|
|
|
[考研] 308求調(diào)劑 +3 | 阿姐阿姐家啊 2026-03-18 | 3/150 |
|
|
|
[考研] 321求調(diào)劑 +9 | 何潤(rùn)采123 2026-03-18 | 11/550 |
|
|
|
[考研] 一志愿中南化學(xué)（0703）總分337求調(diào)劑 +8 | niko- 2026-03-19 | 9/450 |
|
|
|
[考研] 北科281學(xué)碩材料求調(diào)劑 +5 | tcxiaoxx 2026-03-20 | 5/250 |
|
|
|
[考研] 289求調(diào)劑 +6 | 懷瑾握瑜l 2026-03-20 | 6/300 |
|
|
|
[考研] 材料與化工求調(diào)劑 +7 | 為學(xué)666 2026-03-16 | 7/350 |
|
|
|
[考研] 0703化學(xué)調(diào)劑 +5 | pupcoco 2026-03-17 | 8/400 |
|
|
|
[考研] 【同濟(jì)軟件】軟件（085405）考研求調(diào)劑 +3 | 2026eternal 2026-03-18 | 3/150 |
|
|
|
[考研] 材料工程專碩274一志愿211求調(diào)劑 +6 | 薛云鵬 2026-03-15 | 6/300 |
|
|
|
[考研] 一志愿南京大學(xué)，080500材料科學(xué)與工程，調(diào)劑 +4 | Jy? 2026-03-16 | 4/200 |
|
|
|
[考研] 0856專碩279求調(diào)劑 +5 | 加油加油！? 2026-03-15 | 5/250 |
|