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[求助]
求助:低溫下(-20℃~)醇的飽和蒸汽壓
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請(qǐng)問(wèn)各位高人,以下這些醇《甲醇、乙醇、正丙醇、異丙醇、正丁醇、異丁醇》在低溫區(qū)間(-20℃~溶劑沸點(diǎn))飽和蒸汽壓如何得到? 化工熱力學(xué)的書(shū)上有antoine方程的參數(shù),但是溫度范圍大多比較高,我需要低溫區(qū)間的antoine方程參數(shù),請(qǐng)問(wèn)如何得到? 總共108金幣,揮淚灑出88金幣,麻煩大家,大家費(fèi)心了! |
木蟲(chóng) (著名寫手)
至尊木蟲(chóng)
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甲醇:用以下公式計(jì)算,T為攝氏溫度值 P為飽和蒸汽壓(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 |

木蟲(chóng) (正式寫手)
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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 ” |

木蟲(chóng) (正式寫手)
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4樓的溫度更正為: 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 ------------------------------------------------------------------------------------------------ 下面給出另外一種形式的Antoine參數(shù),參數(shù)越多,計(jì)算的精度相對(duì)較高。 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 |

銀蟲(chóng) (小有名氣)
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