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scxdtdfl

银虫 (正式写手)

[求助] 求助:低温下(-20℃~)醇的饱和蒸汽压

请问各位高人,以下这些醇《甲醇、乙醇、正丙醇、异丙醇、正丁醇、异丁醇》在低温区间(-20℃~溶剂沸点)饱和蒸汽压如何得到?
化工热力学的书上有antoine方程的参数,但是温度范围大多比较高,我需要低温区间的antoine方程参数,请问如何得到?

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shench_221

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★ ★
jincanyan(金币+2): 多谢应助 2011-06-19 14:53:13
Compound: ethyl alcohol        or ethanol
CAS NO: 64-17-5       
Formula: C2H6O       

ln(p/mmHg)=A-B/(T/K+C)
Antoine Constants and the corresponding temperature region
A               B            C        Tmin /K          Tmax /K       
8.13484          1662.48        238.131            -114.1          243.1       

Cited from “Yaws, C. L., Yaws' Handbook of Thermodynamic and Physical Properties of Chemical Compounds. 2003. Online version available at: http://knovel.com/web/portal/bro ... 67&VerticalID=0
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4楼2011-06-15 11:22:12
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shench_221

木虫 (正式写手)

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jincanyan(金币+2): 多谢应助 2011-06-19 14:53:18
4楼的温度更正为:
n(p/mmHg)=A-B/(T/K+C)
Antoine Constants and the corresponding temperature region
A               B            C        Tmin /K          Tmax /K        
8.13484          1662.48        238.131            159.05   516.25
------------------------------------------------------------------------------------------------
下面给出另外一种形式的Antoine参数,参数越多,计算的精度相对较高。
Title:  Yaws' Handbook of Thermodynamic and Physical Properties of Chemical Compounds
Table:  Vapor Pressure
Cited from “Yaws, C. L., Yaws' Handbook of Thermodynamic and Physical Properties of Chemical Compounds. 2003. Online version available at: http://knovel.com/web/portal/bro ... 67&VerticalID=0
-------------------------------------------------------------------------
Row (Record) Number:  1969
ethyl alcohol or ethanol;
CAS Registry No. 64-17-5
mol. Formula C2H6O
mol. Weight 46.069 g.mol-1
-------------------------------------------------------------------------
The correlation for vapor pressure as a function of temperature is given by:
                log10 P = A +  B/T + C log10 T + D T + E T2                Eq. 1               
where                P = vapor pressure, mm Hg
                A, B, C, D, and E = regression coefficients for chemical compound
                T = temperature, K
The results for vapor pressure are given in the live table.   
The tabulated values are based on regression of experimental data and researched estimates.
Tmin and Tmax describe the temperature range the equation is valid for.
A        23.844
B        -2864.2
C        -5.0474
D        3.7448E-11
E        2.7361E-07
Tmin (K)         159.05
Tmax (K)         516.25
Tmin (℃)         -114.10
Tmax (℃)         243.10
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5楼2011-06-15 12:01:11
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