乙醇-水溶液精馏课程设计(3)

82.3 81.6 80.7 79.8 79.7 79.3 78.74 78.41 78.15 利用① tF :

0.2608 0.3273 0.3965 0.5079 0.5198 0.5732 0.6763 0.7472 0.8943 0.5580 0.5826 0.6122 0.06564 0.6599 0.6841 0.7385 0.7815 0.8943 tF tD tW

89.0?86.7tf?89.0= tF=84.97℃

7.21?9.6611.5?7.2178.15?78.41td?78.15② tD: := tD =78.21℃

89.43?74.4286.0?89.43100?95.5tw?100③ tW := tW =99.91℃

0?1.900.04?0tf?td84.97?78.21④ 精馏段平均温度:t1===81.59℃

22tf?tw84.97?99.91⑤ 提留段平均温度:t2===92.44℃

223.2.2密度

1aAaB已知:混合液密度:

?l??A??B

混合气密度:?V?塔顶温度: tD=78.21℃ 气相组成yD:

T0PM22.4TP0

78.41?78.1578.21?78.15 yD=86.83% ?78.15?89.43100yD?89.43进料温度: tF=84.97℃ 气相组成yF:

89.0?86.789.0?84.97 yF=47.39% ?38.91?43.7538.91?100yF塔底组成: tW=99.91℃ 气相组成yw:

100?95.5100?99.91 yw=0.34% ?0?17.00?100yw39

(1)精馏段

xD?xF86.0%?11.5%??48.75% 22yD?yF86.83%?47.39%??67.11% 气相组成y1:y1?22液相组成x1:x1?所以ML1?46*0.4875?18*(1?0.4875)?31.65kg/mol

MV1?46*0.6711?18*(1?0.6711)?36.79kg/mol

(2)提留段

xW?xF0.04%?11.5%??5.77% 22yW?yF0.34%?47.39%??23.87% 气相组成y2:y2?22液相组成x2:x2?所以ML2?46*0.0577?18*(1?0.0577)?19.62kg/mol

MV2?46*0.2387?18*(1?0.2387)?24.68kg/mol

由不同温度下乙醇和水的密度,内差法求tF tD tW下的乙醇和水的密度 温度T,℃ 70 754.2 977.8 80 742.3 971.8 90 730.1 965.3 100 717.4 958.4 110 704.3 951.6 ?A,KG/M3 ?B,KG/M3 tF=84.97℃ ?CF?733.56 ?wF?968.57

1?F?0.251?0.25 ?F?830.88kg/m3 ?733.56968.57tD=78.21℃ ?CD?733.72 ?WD?972.87kg/m3

1?D?0.941?0.94 ?D?744.70kg/m3 ?733.72972.87tW=99.91℃ ?CW?717.53 ?wW?958.46kg/m3

1?W?0.0011?0.001 ?W?958.14kg/m3 ?717.53958.46所以?L1?830.88?744.70?787.79kg/m3

22?F??W830.88?958.14?L2???894.51kg/m3

22?39

?F??D