THE RELATIONSHIP BETWEEN THE STRUCTURE OF PHASE EQUILIBRIUM DIAGRAM AND THE STRUCTURE OF FLOWSHEET DIAGRAMS OF MULTIPHASE QUATERNARY MIXTURES SEPARATION

In this work the structures of phase equilibrium diagrams of multiphase four-component systems n-hexane (n-heptane, n-octane) - cyclohexane - furfural - water were investigated. The systems are characterized by the existence of areas of three-phase separation. On the basis of the obtained data the synthesis of feasible variants of separation schemes was carried out, rational modes of functioning of each column were found, the energetically favorable variant was chosen. It was found that the use of preliminary phase separation in systems with n-hexane and n-octane is power-efficient, and the profit in case of the octane system (equimolar mixture) in comparison with the application of the first predetermined separation at the first stage is more than 25%. Certain difficulties (the high values of columns effectiveness: 60 and 40 theoretical plates) upon the separation of the hexane and heptane systems are due to the similar volatilities of n-hexane (n-heptane) and cyclohexane in the vicinity of the point of pure alkane.

phase diagram structure, limited solubility, azeotrope, mathematical simulation, three-phase separation region, separation flowsheet

1. Serafimov L.A., Frolkova A.K. // Theoretical Foundations of Chemical Engineering. 1997. V. 31. № 2. P. 193–201. (in Russ.)

2. Kogan V.B., Fridman V.M., Kafarov V.V. Ravnovesie mezhdu zhidkost'yu i parom [Equilibrium between liquid and vapor]: handbook. L.: Nauka, 1961. 642 p. (in Russ.)

3. Frehnsis A. Ravnovesie zhidkost' – zhidkost' (The equilibrium liquid – liquid): (trans. from Eng.) / Ed. by D.S. Tsikles. M.: Khimiya, 1969. 240 p. (in Russ.)

4. Sorensen J.M., Arlt W. Liquid-Liquid Equilibrium Data Collection. 3 parts / DECHEMA Chemistry Data Series, 1979, 1980.

5. Ooms T., Vreysen S., Baelen G. V., Gerbaud V., Rodriguez-Donis I. // Chem. Eng. Research and Design. 2014. V. 92. № 6. P. 995–1004.

6. Prayoonyong P., Jobson M. // Chem. Eng. Research and Design. 2011. V. 89. № 8. P. 1362–1376.

7. San-Jang Wanga S-J., Huang K. // Chem. Eng. and Processing. 2012. V. 60. P. 65–76.

8. Sebyakin A.Yu., Frolkova A.K. // Theoretical Foundations of Chemical Engineering. 2016. V. 50. № 2. P. 207–214. (in Russ.)

9. Frolkova A.V., Balbenov S.A., Frolkova A.K., Akishina A.A. // Russian Chemical Bulletin. 2015. № 10. P. 2330–2336. (in Russ.)

10. Kolyuchkina G.Ya. Issledovanie v oblasti razdeleniya geteroazeotropnykh smesej [Research in the field of separation of heterogeneous azeotropic mixtures): abstract of the PhD. M.: MITHT, 1972. 131 p.

11. Sazonov V.P., Sarkisov A.G. // Russian Journal of Physical Chemistry A. 1968. V. 42. № 8. P. 2066–2070. (in Russ.)

12. Ogorodnikov S.K., Lesteva T.M., Kogan V.B. Spravochnik po azeotropii [Handbook on Azeotropy]. L.: Khimiya, 1971. 848 p. (in Russ.)

13. Serafimov L.A. // Russian Journal of Physical Chemistry. A. 1968. V. 42. № 1. P. 248–252. (in Russ.)

14. Uehjles S. Fazovye ravnovesiya v khimicheskoj tekhnologii [Phase equilibrium in chemical engineering]: in 2 parts / trans. from Engl. Ch. 1. M.: Mir, 1989. 304 p. (in Russ.)

15. L'vov S.V. Nekotorye voprosy rektifikacii binarnykh i mnogokomponentnykh smesej [Some problems of rectification of binary and multicomponent mixtures]. M.: Izd. AN SSSR, 1960. 166 p. (in Russ.)

16. Frolkova A.V., Frolkova A.K., Klindukhova A.G., Vityukov S.A. // Tonkie khimicheskie tekhnologii (Fine Chem. Technologies). 2015. V. 10. № 4. P. 22–28.