A gas chromatographic study of the evaporation from films composed of a volatile solvent plus a non volatile, non polymeric liquid

REYNALDO CÉSAR CASTELLS, MÓNICA LAURA CASELLA, ANGEL MIGUEL NARDILLO

INDUSTRIAL & ENGINEERING CHEMICAL RESEARCH

American Chemical Society

Lugar: Columbus, Ohaio, USA; Año: 1989 vol. 28 p. 1236 - 1241

0888-5885

The evaporation rates from films composed of n-octane + squalane and toluene + sulfolane were measured by a gas chromatographic method. Both the conditions at the gas/liquid interface and the transport of volatile solvent from within the liquid t o the interface determine the evaporation rate. The equations obtained by integrating Fick’s second law for a homogeneous film under the assumptions of constant diffusivity and constant film thickness fail t o interpret the experimental results. In principle, the films can be considered as heterogeneous, with a very thin surface layer where the volatile solvent has a very low diffusivity and an underlying liquid a t uniform composition. the transport of volatile solvent from within the liquid t o the interface determine the evaporation rate. The equations obtained by integrating Fick’s second law for a homogeneous film under the assumptions of constant diffusivity and constant film thickness fail t o interpret the experimental results. In principle, the films can be considered as heterogeneous, with a very thin surface layer where the volatile solvent has a very low diffusivity and an underlying liquid a t uniform composition. measured by a gas chromatographic method. Both the conditions at the gas/liquid interface and the transport of volatile solvent from within the liquid t o the interface determine the evaporation rate. The equations obtained by integrating Fick’s second law for a homogeneous film under the assumptions of constant diffusivity and constant film thickness fail t o interpret the experimental results. In principle, the films can be considered as heterogeneous, with a very thin surface layer where the volatile solvent has a very low diffusivity and an underlying liquid a t uniform composition. the transport of volatile solvent from within the liquid t o the interface determine the evaporation rate. The equations obtained by integrating Fick’s second law for a homogeneous film under the assumptions of constant diffusivity and constant film thickness fail t o interpret the experimental results. In principle, the films can be considered as heterogeneous, with a very thin surface layer where the volatile solvent has a very low diffusivity and an underlying liquid a t uniform composition. + squalane and toluene + sulfolane were measured by a gas chromatographic method. Both the conditions at the gas/liquid interface and the transport of volatile solvent from within the liquid t o the interface determine the evaporation rate. The equations obtained by integrating Fick’s second law for a homogeneous film under the assumptions of constant diffusivity and constant film thickness fail t o interpret the experimental results. In principle, the films can be considered as heterogeneous, with a very thin surface layer where the volatile solvent has a very low diffusivity and an underlying liquid a t uniform composition. the transport of volatile solvent from within the liquid t o the interface determine the evaporation rate. The equations obtained by integrating Fick’s second law for a homogeneous film under the assumptions of constant diffusivity and constant film thickness fail t o interpret the experimental results. In principle, the films can be considered as heterogeneous, with a very thin surface layer where the volatile solvent has a very low diffusivity and an underlying liquid a t uniform composition. at the gas/liquid interface and the transport of volatile solvent from within the liquid t o the interface determine the evaporation rate. The equations obtained by integrating Fick’s second law for a homogeneous film under the assumptions of constant diffusivity and constant film thickness fail t o interpret the experimental results. In principle, the films can be considered as heterogeneous, with a very thin surface layer where the volatile solvent has a very low diffusivity and an underlying liquid a t uniform composition.