精馏塔全塔物料衡算

一、精馏塔全塔物料衡算

:原料组成(摩尔分数、下同)F:进料量(kmol)Fs:塔顶组成D:塔顶产品流量(kmol)D

s:塔底组成W:塔底残液流量(kmol)wsF?1.2?104t xF?4600 xD?9300 xW?100

axxxM甲醇?32.04kgkmol

M水?18.02kgkmol

46/32.04?32.400

46/32.04?54/18.0293/32.04塔顶组成:xD??88.200

93/32.04?7/18.021/32.04塔底组成:xW??0.600

1/32.04?99/18.02原料甲醇组成:

xF?进料量:

1.2?104?103[0.324/32.04?(1?0.324)/18.02]tF?1.2?10??2.205?10?2kmol as300?24?36004物料衡算式为:

F?D?WFxF?DxD?WxW?3

联立代入求解:D?8?10 W?1.405?10

二、常压下甲醇—水气液平衡组成(摩尔)与温度关系

1、温度

?290.3?88.9otF?90.3..........:?..........?68.52CtF7.67?9.2632.4?7.67tF64.7?66.9tD?64.7o:?......................?66.76C tD100?87.4188.2?100tD100?92.9tW?100o:?..........................?99.2CtW0?5.310.6?0tW精馏段平均温度:

t1?tt?FD2?68.52?66.76?67.64oC

268.52?66.76?83.86oC

2提馏段平均温度:

tF?t2?tW2?

2、密度

1混合液密度:??L?aAAo??aBB(a为质量分数,M为相对分子质量)

已知:

混合气密度:??VTpM22.4Tpo塔顶温度:气相组成:

tD?66.76oC

66.9?64.766.76?64.7:........y?92.500 yD91.96?100?100?100..........DyD进料温度:气相组成:

to?68.52C F?y:84.92?89.6284.92?100F70?6870?68.52y..............y?88.400

FF塔底温度:气相组成:

o?99.2C tWy100?92.9100?99.2:?.........................y?3.1900 W0?28.34W0?100yW1>精馏段: 液相组成:

x1?y1(xD?xF)(y?D22........................x1?60.300

.......................y?90.4500

1气相组成:

1?y)F所以:

ML?32.04?0.603?18.02(1?0.603)?26.474kg?32.04?0.9045?18.02(1?0.9045)?30.7kg(xW?xF)(y?W1kmolkmolMV

2>提馏段: 液相组成:

x2?y222..........................x2?16.500

........................y?46.1500

2气相组成:

2?y)F所以:

ML?32.04?0.165?18.02(1?0.165)?20.33kgkmolkmolMV

?32.04?0.4615?18.02(1?0.4615)?24.49kg

2

由不同温度下甲醇和水的密度: 温度/oC 甲醇 760 751 743 734 725 716 水 988.1 983.2 977.8 971.8 965.3 958.4 ?350 60 70 80 90 100 求得在

tD、

tF、

tD下的甲醇和水的密度(单位:kg?m)

o?68.52CtF70?6070?68.52?.........................??744.628cF743?751743??cF70?6070?68.52?................??978.599wF977.8?983.2977.8??wF1??F0.461?0.46?......................??855.015F744.628978.599o?66.76CtD70?6070?66.76?...........................??746.564cD743?751743??cD70?6070?66.76?..................??979.55cD977.8?983.2977.8??wD

1?tW?D0.931?0.93?.........................??759.204D746.564979.55?99.2oC100?90100?99.2?............................??716.72cW716?725716??cW100?90100?99.2?...................?wW?965.852958.4?965.3965.3??wW1??W0.011?0.01?...........................??962.51W716.72965.852(???)(855.015?759.204)FD???807.11 ?L122所以:

(???)(962.51?855.015)?908.76

?L2?WF2?2

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