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1、一、精馏塔全塔物料衡算)(:)(:)(:skmolWskmolDskmolF塔底残液流量塔顶产品流量进料量:塔底组成:塔顶组成、下同):原料组成(摩尔分数xxxwDFatF4102.100F46x00D93x00W1xkmolkg04.32M甲醇kmolkg02.18M水原料甲醇组成:00F4.3202.18/5404.32/4604.32/46x塔顶组成:00D2.8802.18/704.32/9304.32/93x塔底组成:00W6.002.18/9904.32/104.32/1x进料量:skmolatF234410205.236002430002.18/)324.01(04.32/324
2、.010102.1102.1物料衡算式为:xxxWDFWDWDFF联立代入求解:3108D210405.1W二、常压下甲醇水气液平衡组成(摩尔)与温度关系1、温度CCCooottttttttt2.99.06.010031.509.9210076.66.1002.887.6441.871009.667.6452.68.67.74.323.9026.967.79.883.90WWWDDDFFF:精馏段平均温度:Cottt64.67276.6652.682DF1提馏段平均温度:Cottt86.83276.6652.682WF22、密度已知:pTaaooBBAALTpa4.22M)M(1V混合气密度:
3、为相对分子质量为质量分数,混合液密度:塔顶温度:Cot76.66D气相组成:00DDD5.92.1001007.6476.6610096.917.649.66yyy:进料温度:Cot52.68F气相组成:00FFF4.88.10092.8452.687062.8992.846870yyy:塔底温度:Cot2.99W气相组成:00WWW19.3.10002.9910034.2809.92100yyy:1精馏段:液相组成:001FD13.60.2)(xxxx气相组成:001FD145.90.2)(yyyy所以:kmolkg7.309045.0102.189045.004.32Vkmolkg474.
4、26603.0102.18603.004.32LMM11)()(2提馏段:液相组成:002FW25.16.2)(xxxx气相组成:002FW215.46.2)(yyyy所以:kmolkg49.244615.0102.184615.004.32Vkmolkg33.20165.0102.18165.004.32LMM22)()(由不同温度下甲醇和水的密度:温度/Co甲醇水50760988.160751983.270743977.880734971.890725965.3100716958.4求得在tD、tF、tD下的甲醇和水的密度(单位:3mkg)51.962.852.96501.01716.72
5、0.011852.965.3.9652.991003.9654.9589010072.716.7162.99100725716901002.99204.759.55.97993.01564.74693.0155.979.8.97776.66702.9838.9776070564.746.74376.6670751743607076.66015.855.599.97846.01628.74446.01599.978.8.97752.68702.9838.9776070628.744.74352.6870751743607052.68WWwWwWcWcWWDDcDwDcDcDDFFwFwFcFcF
6、FCCCooottt所以:11.8072204.759015.8552LDF1)()(76.9082015.85551.9622LFW2)()(845.02V0985.12V605.015.2734.2215.273112.115.2734.2215.273085.115.2734.2215.273kmolkg4385.242Vkmolkg699.302Vkmolkg467.181kmolkg41.301kmolkg9885.301kmolkg33.22Lkmolkg474.262Lkmolkg10.181kmolkg56.221kmolkg39.301VWVFVDVFWVWVWDVDVDFV
7、FVFVFVWVFVDWWVWFFVFDDVDLFLWLFLDWWLWFFLFDDLD212121MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM)()()()()()()()()()()()()()()(水甲醇水甲醇水甲醇水甲醇水甲醇水甲醇tttyyyyyyxxxxxx3、混合液体表面张力:二元有机物水溶液表面张力可用下列公式计算:414141OsOwsWm注:VVVOOWWWWWxxxVVVOOOOOOOxxxVVSWsWsWxVVSososoxQBA3232)(441.0)lg(VWWqTqQBVooowq12lgAsoswsosw)(式中,下脚标w、o、s 分别代表水
8、、有机物及表面部分;xw、xo指主体部分的分子数;Vw、Vo指主体部分的分子体积;W、o为纯水、有机物的表面张力;对甲醇q=1。mL66.18852.96502.18mL40.1855.97902.18mL41.185992.97802.18mL03.43628.74404.32mL70.4472.71604.32mL92.42564.74604.32wWcwWwDcwDwFcwFcFccFcWccWcDccDVVVVVVmmmmmm由不同温度下甲醇和水的表面张力:温度/Co甲醇表面张力/)10(3mN水的表面张力/)10(3mN6019.366.27018.264.38017.462.690
9、16.460.710015.558.8求得在tD、tF、tW下的甲醇和水的表面张力)N10(3-m单位:甲醇的表面张力:36.18.2.183.192.1852.68706070cFcF57.15.5.154.165.152.991009010056.18.2.183.192.1876.66706070cWcWcDcD水的表面张力:58.64.3.642.663.6452.68706070wFwF95.58.8.587.608.582.99100901009156.64.3.642.663.6476.66706070wWwWwDwD塔顶表面张力:00144.011VVVVcDDwDDcDDwD
10、DcDwDxxxx)()(13.3-0.29-2.84QBA29.0-3232)(441.0837.2-00144.0lg)lg(VwDwDcDcDcDwD)()(qTqQBV联立方程组:1lgAscDswDscDswD)(=99926.000074.0scDswD58.18076.256.1899926.092.6400074.0DcDscDwDswDD4141414141原料表面张力:0338.011VVVVcFFwFFcFFwFFcFwFxxxx)()(.761-0.29-1.47QBA29.0-3232)(441.0.471-0338.0lg)lg(VwFwFcFcFcFwF)()(q
11、TqQBV联立方程组:1lgAscFswFscFswF)(=983.0017.0scFswF826.18026.236.18983.058.64017.0FcFscFwFswFF4141414141塔底表面张力:6754.311VVVVcWWwWWcWWwWWcWwWxxxx)()(3043.00.261-5653.0QBA261.0-3232)(441.05653.06754.3lg)lg(VwWwWcWcWcWwW)()(qTqQBV联立方程组:1lgAscWswWscWswW)(=332.0668.0scWswW72.3951.27.44332.095.58668.0WcWscWwWsw
12、WW41414141411精馏段的平均表面张力为:703.182)(DF12提馏段的平均表面张力为:15.292)(DW24、混合物的粘度不同温度下甲醇和水粘度系数:温度/Co甲醇粘度系数/甲醇水粘度系数/水600.350.479700.3060.414800.2770.362900.2510.3211000.2250.288Cot64.671429.0.414.064.6770479.0414.06070316.0.306.064.6770350.0306.06070水水甲醇甲醇Cot68.832346.0.321.086.8390362.0321.08090267.0.251.086.83
13、90277.0251.08090水水甲醇甲醇1精馏段粘度:smPa3609.01111)(水甲醇xx2提馏段粘度smPa333.0)1(222xx水甲醇5、相对挥发度由324.0 xF、884.0yF得9.15324.01884.01324.0884.0F由882.0 xD、925.0yD得65.1882.01925.01882.0925.0D由006.0 xW、0319.0yW得459.5006.010319.01006.00319.0W精馏段的平均相对挥发度:775.82)(1DF提馏段的平均相对挥发度:68.102)(2WF三、理论塔板的计算:理论板:指离开此版的汽液两相平衡,而且塔板上液相组成均匀。四、您好,欢迎您阅读我的文章,本WOR 文档可编辑修改,也可以直接打印。阅读过后,希望您提出保贵的意见或建议。阅读和学习是一种非常好的习惯,坚持下去,让我们共同进步。