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scxdtdfl

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[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?

总共108金币,挥泪洒出88金币,麻烦大家,大家费心了!
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杨威.001

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至尊木虫

【答案】应助回帖

★ ★
liufengbao100(金币+1): 谢谢应助~ 2011-06-14 23:07:03
scxdtdfl(金币+88): 2 2011-06-15 10:14:36
jincanyan(金币+1): 多谢应助 2011-06-19 14:47:21
甲醇:用以下公式计算,T为摄氏温度值 P为饱和蒸汽压(kPa)
P =a + b × T + c × T^2 + d × T^3 + e × T^4
其中
a = -1.0745
b = -0.1788
c = 0.0311
d = -0.0002
e = 0.000003
鸿鹄安知燕雀之志哉!
2楼2011-06-14 22:52:37
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scxdtdfl

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引用回帖:
Originally posted by 杨威.001 at 2011-06-14 22:52:37:
甲醇:用以下公式计算,T为摄氏温度值 P为饱和蒸汽压(kPa)
P =a + b × T + c × T^2 + d × T^3 + e × T^4
其中
a = -1.0745
b = -0.1788
c = 0.0311
d = -0.0002
e = 0.000003

有文献支撑吗?您这似乎只是一个简单的多项式关联?温度范围也没给呢~
3楼2011-06-15 00:06:09
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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
别驻足,梦想要不停,追逐!
4楼2011-06-15 11:22:12
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shench_221

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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
别驻足,梦想要不停,追逐!
5楼2011-06-15 12:01:11
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xiongying88

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百度一下了
6楼2011-06-18 21:31:58
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