extractive and azeotropic distillation

[...]... water from aqueous ethylene glycol In Extractive and Azeotropic Distillation; Tassios, D.; Advances in Chemistry; American Chemical Society: Washington, DC, 1974 1 B L A C K A N D DITSLER Table VIII Dehydration Distillation, 14.7 Ethanol psia (85.64%m Azeotropic 13 Mixtures Comparing Extractive and Azeotropic Feed: Aqueous Extractive of Ethanol Distillation Ethanol) Distillation, 50 psia S o l v e n t... E S., "Azeotropic and Extractive Distillation, " Wiley, New York, 1964 9 Gerster, J Α., Chem Eng Progr (1969) 65 (9), 43 10 Black, C., Golding, R Α., Ditsler, D E., Advan Chem Ser (1972) 115, 64 RECEIVED November 24, 1970 In Extractive and Azeotropic Distillation; Tassios, D.; Advances in Chemistry; American Chemical Society: Washington, DC, 1974 2 Process Design Considerations for Extractive Distillation: ... explores combinations of solvent selectivity and other solvent properties which might make extractive distillation attractive It appears that in almost all cases extractive distillation offers no advantage compared with ordinary distillation Only in special cases may circumstances warrant extractive distillation External factors favoring the use of extractive distillation are identified ' T p h i s w... e b o i l e r d u t i e s i n In Extractive and Azeotropic Distillation; Tassios, D.; Advances in Chemistry; American Chemical Society: Washington, DC, 1974 18 E X T R A C T I V E Solvent £ A N D A Z E O T R O P I C DISTILLATION • Propane Product Extractive Distillation Column Feed Propylene Solvent Product Recovery Column Steam Solvent Cooler Figure 1 Extractive distillation process flowsheet t h... Gerster, J Α., Chem Eng Progr (1969) 65, 9, 43 xi In Extractive and Azeotropic Distillation; Tassios, D.; Advances in Chemistry; American Chemical Society: Washington, DC, 1974 1 Dehydration of Aqueous Ethanol Mixtures by Extractive Distillation C BLACK and D E DITSLER Shell Development Co., Emeryville, Calif 94608 Although nonidealities in vapor and liquid phases complicate the separation of components... o l a t i l e a n d is d r i v e n o v e r h e a d In Extractive and Azeotropic Distillation; Tassios, D.; Advances in Chemistry; American Chemical Society: Washington, DC, 1974 20 E X T R A C T I V E A N D AZEOTROPIC DISTILLATION Temperature, °C Figure 2 Effect of temperature on solvent selectivity and propane activity coefficient in furfural and in acetonitrile (calculated) i n o r d i n a r y d... Volatility = profiles in the extractive distillation ethanol with ethylene glycol 4.08688, R/F = of aqueous 1.5537 moles, 99.99% recovery, ethanol In Extractive and Azeotropic Distillation; Tassios, D.; Advances in Chemistry; American Chemical Society: Washington, DC, 1974 1 B L A C K A N D DITSLER Dehydration of Ethanol 9 Mixtures T h e t e m p e r a t u r e profile for the extractive d i s t i l l a... design an extractive distillation step Ethylene glycol is added to an aqueous ethanol mixture to produce the overhead separation of ethanol from water Methods published earlier by one of the authors are applied to calculate phase equilibria in a computer calculation of the separation The extractive distillation results are tabulated, represented graphically, and discussed to illustrate extractive distillation. .. 0.000000 In Extractive and Azeotropic Distillation; Tassios, D.; Advances in Chemistry; American Chemical Society: Washington, DC, 1974 t,°C 75.0 75.0 75.0 87.8 87.8 87.8 100.0 100.0 100.0 4 E X T R A C T I V E Table IV A Z E O T R O P I C DISTILLATION Enthalpies for Liquid and Vapor h (liquid) Btu/lb mole t °F Ethanol A N D H ( vapor) Btu/lb mole 32 100 200 300 100 200 300 400 glycol Water Distillation. .. ratios and reflux- recovery of ethanol in the extractive distilfotion with ethylene glycol at 14.7 psia In Extractive and Azeotropic Distillation; Tassios, D.; Advances in Chemistry; American Chemical Society: Washington, DC, 1974 1 B L A C K A N D 2 Figure 2 DITSLER Dehydration of Ethanol 5 Mixtures 3 4 ETHYLENE GLYCOL/ΕΤΗANOL (MOLE BASIS) Effect of solvent-feed ratio on product purity in the distillation . alt="" Extractive and Azeotropic Distillation In Extractive and Azeotropic Distillation; Tassios, D.; Advances in Chemistry; American Chemical Society: Washington, DC, 1974. In Extractive. description, and tray-to-tray calculation schemes have greatly facilitated the design of extractive and azeotropic distillation schemes, and use of salts give new methods for extractive distillation . 0.000000 100.0 In Extractive and Azeotropic Distillation; Tassios, D.; Advances in Chemistry; American Chemical Society: Washington, DC, 1974. 4 EXTRACTIVE AND AZEOTROPIC DISTILLATION Table