傳質(zhì)系數(shù)的測(cè)定

1、液液傳質(zhì)系數(shù)的測(cè)定實(shí)驗(yàn)記錄與處理表1 50醋酸在水相和酯相中的平衡濃度(W%)酯相04.9610.8713.1316.6318.9722.0524.224.5水相05.378.6710.714.8719.7320.4924.0824.5表2 純物系性質(zhì)表物系水醋酸乙酸乙酯密度（kg/m3）997.11049901表3 50醋酸在水相和酯相中的平衡濃度水相(mol/L)00.9388551.5158051.8707166672.5997716673.4494623.5823354.2099874.283417酯相(mol/L)00.8671733331.9004383332.2955616672

2、.9074783333.3165883.8550754.2309674.283417計(jì)算范例：濃度c=p*w/MC單位mol/L M單位 g/mol P 單位g/L由圖可知：平衡分配系數(shù)m=1.0366表4 水相處理數(shù)據(jù)實(shí)驗(yàn)序號(hào)時(shí)間/min樣品質(zhì)量/gNaOH的體積/mlCw(mol/L)Co*(mol/L) (mol/L)瓶重/g總重/g凈重/g1510.32810.93150.603520.3304390.3425332108.1298.480.3511.50.4261110.4417073 0158.4828.9060.4242.60.6114290.6338084209.1579.69

3、60.5393.10.5734710.594465257.6948.21210.51813.30.6350960.658346309.98610.38130.39532.60.6558210.6798247 03510.70511.05620.351220.5678250.588607計(jì)算范例：以5min為例 水的密度p=997.1g/L水相溶質(zhì)的物質(zhì)的量 nw=v(NaOH)*0.1/1000=2*0.1/1000=0.0002mol 水相溶質(zhì)的濃度Cw=Nw*p水/m總=0.0002*997.1/0.6035=0.330439mol/L 與之平衡的酯相濃度Co*=m*Cw=1.0366*0

4、.330439=0.34253mol/L表5 酯相處理數(shù)據(jù)序號(hào)時(shí)間/min樣品質(zhì)量/gNaOH的體積/ml酯相瓶重/g總重/g凈重/gCo(mol/L)Cw*(mol/L)008.6519.70811.057119.21.6364771.5786971510.03910.5670.5288.81.5016671.4486462108.5939.14450.55158.31.3559931.30811631510.2310.540.314.81.3950971.3458394207.4177.9180.5016.51.1689621.1276895258.9489.60710.65918.91.

5、216644196511.4550.496.41.1768161.1352667358.1958.73560.54066.51.0833331.045083計(jì)算范例：以5min為例乙酸乙酯的密度p=901kg/m3=901g/L酯相溶質(zhì)的物質(zhì)的量nw=v(NaOH)*0.1/1000=0.00088mol酯相溶質(zhì)的濃度Co=nw*p/m總=0.00088*901/0.528=1.5016647mol/L與之平衡的水相濃度Cw*=Co/m=1.5016647/1.0366=1.578697mol/L表6 酯相與水相濃度關(guān)于時(shí)間的關(guān)系表時(shí)間/minCo(mol/L)Cw(

6、mol/L)01.636477051.5016670.330439101.3559930.426111151.3950970.611429201.1689620.573471251.2166440.635096301.1768160.655821351.0833330.567825表6 水相處理數(shù)據(jù)水相體積Vw=400mL=0.0004m3 接觸面積A=6*3.8cm3=0.00228m3酯相體積Vo=400mL=0.0004m3 序號(hào)時(shí)間/min樣品凈重/gNaOH的體積/mlCw(mol/L)Cw*(mol/L)Cw*-Cw(ln)Kw(m/min)0001.578696851.57869

7、700150.603520.3304391051.4486462151.118207-0.344870.0121012100.3513.20.4261111111.3081157120.882005-0.582160.0102133150.4243.20.6114292451.3458390640.73441-0.765290.0089514200.5393.10.5734712431.1276886710.554217-1.04680.0091825250.51813.30.6350955411.1736869650.538591-1.07540.0075476300.39532.60.65

8、58208961.1352656050.479445-1.191730.0069697350.35122.50.5678246011.0450832850.477259-1.19630.005996計(jì)算范例：以5min為例lnCw*Kw=-VwAt lnCw*t-Cw(t)Cw*0表7 酯相處理數(shù)據(jù)序號(hào)時(shí)間/min樣品凈重/gNaOH的體積/mlCo(mol/L)Co*(mol/L)Co*-Co(mol/L)(ln)Ko(m/min)001.057119.21.6364771540-1.6364800150.5288.81.5016666670.342533176-1.15913-0.344870.0121008112100.55158.31.3559927470.441706778-0.91429-0.582160.0102132943150.314.81.3950967740.633807556-0.76129-0.765290.0089507344200.5016.51.1689620760.594460291-0.5745-1.04680.0091824385250.65918.91.2166439080.658340038-0.5583-1.07540.0075466516300.496.41.