The separation of falling binary liquid film in the presence of inert components by diffusion distillation

This paper was presented at the 3rd Micro and Nano Flows Conference (MNF2011), which was held at the Makedonia Palace Hotel, Thessaloniki in Greece. The conference was organised by Brunel University and supported by the Italian Union of Thermofluiddynamics, Aristotle University of Thessaloniki, University of Thessaly, IPEM, the Process Intensification Network, the Institution of Mechanical Engineers, the Heat Transfer Society, HEXAG - the Heat Exchange Action Group, and the Energy Institute.The effects of heat and mass transfer on selectivity and mass fluxes in falling film evaporation of binary mixture on vertical surface, in the presence of inerts in gas (air, helium) and liquid (glycol) phase were investigated. The mathematical model of the process with different simplifying assumptions concerning heat and mass transfer was elaborated. In numerical calculations mass transfer resistances in both gas and liquid phases were considered. Experimental study was performed for 2-ipropanol-water system in the wide range of concentrations and temperatures. The comparison shows small effect of diffusional cross effects on mass transfer and selectivity

Integrated evaporation-condensation process of binary liquid mixture separation

Paper presented at the 9th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Malta, 16-18 July, 2012.The effects of heat and mass transfer on selectivity and mass fluxes in falling film evaporation of binary mixture on vertical surface, in the presence of inerts in gas (air, helium) and liquid (glycol) phase were investigated. The mathematical model of the process with different simplifying assumptions concerning heat and mass transfer was elaborated. In numerical calculations mass transfer resistances both in gas and liquid phases were considered. Experimental study was performed for 2-ipropanol-water system in the wide range of concentrations and temperatures. The comparison shows small effect of diffusional cross effects on mass transfer and selectivity.dc201

Application of diffusion distillation in separation of binary mixture in the falling film apparatus

Przeprowadzono badania doświadczalne procesu odparowania filmu ciekłej mieszaniny dwuskładnikowej spływającej po ściance rury pionowej w obecności nieruchomej warstwy gazu inertnego. W opracowanych modelach matematycznych uwzględniono opory transportu ciepła i masy w fazie ciekłej oraz gazowej. Stwierdzono niewielki wpływ oporów dyfuzyjnych w fazie ciekłej na całkowity strumień molowy i selektywność oraz istotny wpływ efektów krzyżowych dyfuzji, rodzaju gazu inertnego oraz temperatury odparowania na efektywność procesu.Falling film evaporation of binary mixture on a vertical surface in the presence of stagnant inert gas was investigated experimentally. In elaborated mathematical models heat and mass transfer resistances in both gas and liquid phases were taken into account. A comparison of experimental and calculated data showed a small effect of diffusion resistances in liquid phase on total mass flux and selectivity, and a significant influence of cross diffusion effects, kind of inert gas and evaporation temperature on process efficiency

Increase of binary mixture separation selectivity in diffusion distillation

Przedstawiono wyniki badań rozdziału mieszanin ciekłych w zintegrowanym procesie odparowania i kondensacji fi lmu cieczy spływającej po ściance rury pionowej w obecności inertów w fazie gazowej oraz ciekłej. Otrzymano znaczny wzrost selektywności rozdziału mieszaniny ciekłej przy dużej zawartości inertu w fazie ciekłej (glikol). Mierzone wartości strumieni masowych rosną z temperaturą odparowania i maleją ze wzrostem zawartości inertu w fazie ciekłej.Separation of binary liquid mixtures by diffusion distillation was investigated. Experiments were performed in a wetted wall column in the presence of inerts in gas and liquid phase. Increase of selectivity was obtained for a higher inert concentration in liquid phase (glycol). Measured mass fl uxes increased with the increase of evaporation temperature and decreased with the rise of inert concentration in liquid phase

Carbon dioxide removal from MEA - water solution on PDMS tubular membrane

The process of carbon dioxide removal from monoethanolamine (MEA) - water solution was investigated on Poly Di Methyl Siloxane (PDMS) hydrophobic tubular membrane with a ceramic support. The effects of feed temperature, liquid flow rate and MEA concentration on C02 mass transfer and selectivity were examined and found to be with a reasonable deviation (+/-25%) with predictions based on the multilayer film model. The membrane resistance was evaluated in separate experiments. The measured C02 mass fluxes (0.17-0.45 kg/(m2h)) were found to be independent of the MEA concentration in the feed

Experimental investigation of carbon dioxide absorption in ionic liquid [BMIM][AC]

W pracy przedstawiono wyniki badań równowagowych pojemności absorpcji ditlenku węgla w cieczy jonowej [bmim][Ac]. Badania przeprowadzono w aparacie barbotażowym, w temperaturach od 20 do 60°C. Badana ciecz jonowa ma zbliżone wielkości równowagowych pojemności absorpcji CO2 do stosowanych w przemyśle wodnych roztworów MEA. Wraz ze wzrostem temperatury rośnie szybkość procesu i maleje równowagowa pojemność sorpcyjna CO2 w cieczy jonowej.The experimental results of equilibrium capacity of carbon dioxide absorption in ionic liquid [bmim][Ac] are presented. Experiments were performed in bubbling apparatus in temperature range 20 - 60°C. Measured equilibrium carbon dioxide absorption capacities are comparable with those obtained for aqueous MEA solutions used in industry. With rising temperature the higher values of absorption rates and lower equilibrium CO2 absorption capacities were obtained

Carbon dioxide absorption in ionic liquids [emim][AC] and [bmim][AC]

W pracy przedstawiono wyniki badań równowagowych pojemności absorpcji ditlenku węgla w cieczach jonowych [bmim][Ac] i [emim][Ac]. Badania przeprowadzono w analizatorze grawimetrycznym IGA i aparacie barbotażowym, w temperaturach od 20 do 60°C. Stwierdzono, że przebadane ciecze jonowe mają zbliżone wielkości równowagowych pojemności absorpcji w porównaniu do stosowanych w przemyśle 15% wodnych roztworów MEA. Duża pojemność absorpcyjna, stabilność termiczna oraz bardzo mała lotność mogą być alternatywą dla roztworów MEA, pomimo znacznie niższej szybkości absorpcji CO2 w cieczach jonowych.The experimental results of equilibrium capacity of carbon dioxide absorption in ionic liquids are presented. [bmim][Ac] and [emim][Ac] ionic liquids were investigated in gravimetric analyser IGA and in bubbling apparatus in temperature range 20-60°C. Measured equilibrium carbon dioxide absorption capacities are comparable with those obtained for 15% aqueous MEA solutions used in industry. High absorption capacities, thermal stability and negligible volatility of investigated ionic liquids may be an alternative for MEA solutions despite of much lower carbon dioxide absorption rate in ionic liquids