A method for separating ternary azeotropes by fully heat-integrated three-column pressure swing rectification
A technology of pressure swing rectification and heat integration, applied in the field of pressure swing rectification, can solve the problems of high equipment investment cost and operating cost, no heat integration method, and no multi-column heat integration, so as to reduce the rectification treatment. The effect of reducing energy consumption and efficient utilization
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Embodiment 1
[0036] The feed temperature is 25° C., the flow rate is 500 kg / h, and the feed contains 70% methanol, 20% acetonitrile and 10% benzene. The high-pressure tower (T1) has a theoretical plate number of 39, 34 feed plates for the fresh stream, 19 feed plates for the recirculating stream, an operating pressure of 5 atm, a tower inner diameter of 0.467m, and a reflux ratio of 0.88; the atmospheric pressure tower (T2) theoretically The number of plates is 36, the feed plate is 12, the operating pressure is 1 atm, the inner diameter of the tower is 0.674m, and the reflux ratio is 1.9; the theoretical plate number of the high pressure column (T3) is 14, the feed plate is 2, the operating pressure is 5 atm, the The inner diameter is 0.345m and the reflux ratio is 0.1. The purity of the product acetonitrile obtained after the separation is 99.96%, and the yield is 99.96%, the purity of the product methanol is 99.95%, and the yield is 99.98%, and the purity of the product benzene is 99.97...
Embodiment 2
[0040] The feed temperature is 25° C., the flow rate is 800 kg / h, and the feed contains 70% methanol, 20% acetonitrile and 10% benzene. The theoretical plate number of the high-pressure tower (T1) is 39, the feed plate of the fresh stream is 27, the feed plate of the circulating stream is 15, the operating pressure is 5atm, the inner diameter of the tower is 0.619m, and the reflux ratio is 1.39; The number of plates is 35, the feed plate is 12, the operating pressure is 1 atm, the inner diameter of the tower is 0.758m, and the reflux ratio is 2.6; the theoretical plate number of the high pressure column (T3) is 15, the feed plate is 3, the operating pressure is 5 atm, the The inner diameter is 0.379m, and the reflux ratio is 0.14. The purity of product acetonitrile obtained after separation is 99.97%, and the yield is 99.97%, the purity of product methanol is 99.96%, and the yield is 99.96%, and the purity of product benzene is 99.97%, and the yield is 99.97%. In order to ill...
Embodiment 3
[0044] The feed temperature is 25° C., the flow rate is 1000 kg / h, and the feed contains 70% methanol, 20% acetonitrile and 10% benzene. The theoretical plate number of the high pressure column (T1) is 39, the fresh stream feed plate is 29, the circulating stream feed plate is 18, the operating pressure is 6atm, the inner diameter of the tower is 0.629m, and the reflux ratio is 1.4; the atmospheric pressure column (T2) theoretically The number of plates is 36, the feed plate is 13, the operating pressure is 1 atm, the inner diameter of the tower is 0.866m, and the reflux ratio is 3.09; the theoretical plate number of the high pressure column (T3) is 13, the feed plate is 2, the operating pressure is 6 atm, the The inner diameter is 0.370m, and the reflux ratio is 0.16. The purity of the product acetonitrile obtained after separation is 99.98%, and the yield is 99.97%, the purity of the product methanol is 99.98%, and the yield is 99.96%, and the purity of the product benzene i...
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