=20块4.塔的精馏段操作工艺条件及相关物性数据的计算4.1平均压力Pm取每层塔板压降为0.9kPa计算。塔顶:PD=101.3kPa加料版:PF=101.3+0.9×11=111.2kPa平均压力:Pm=(PD+PF)/2=(101.3+111.2)/2=106.25kPa4.2平均温度tm塔顶温度64.8℃,加料板温度75℃。tm=(64.8+75)/2=69.9℃4.3平均分子量Mm塔顶:y1=xD=0.95,x1=0.875MVD,m=0.95×32+0.05×17.99=31.2995kg/kmolMLD,m=0.875×32+0.125×17.99=30.2488kg/kmol加料板:xF=0.40,yF=0.729MVD,m=0.729×32+0.271×17.99=28.2033kg/kmolMLD,m=0.40×32+0.6×17.99=23.594kg/kmol精馏段:MV.,m=(31.2995+28.20329)/2=29.7514kg/kmolML,m=(30.24875+23.594)/2=26.9214kg/kmol4.4平均密度ρm4.4.1液相平均密度ρl.m塔顶:ρLD.甲醇=796.14286-0.92857t=796.14286-0.92857×64.8=735.971524kg/m3ρLD.水=1022.72952-0.64486t=1022.72952-0.64486×64.8=980.942592kg/m3ρLD.m=741.2845kg/m3进料板:ρLF.水=796.14286-0.92857t=796.14286-0.92857×75=726.50011kg/m3ρLF.水=1022.72952-0.64486t=1022.72952-0.64486×75=974.36502kg/m3ρLF.m=822.1877kg/m3
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