QDTG Unité pour l´Étude du Coefficient de Diffusion et Transfert de Masse Gazeuse

GASEOUS MASS TRANSFER AND DIFFUSION UNIT - QDTG

Unit: QDTG. Gaseous Mass Transfer and Diffusion Unit

GASEOUS MASS TRANSFER AND DIFFUSION UNIT - QDTG

Complete QDTG Unit

GASEOUS MASS TRANSFER AND DIFFUSION UNIT - QDTG
GASEOUS MASS TRANSFER AND DIFFUSION UNIT - QDTG

SYSTEMES INNOVANTS

The Gaseous Mass Transfer and Diffusion Unit, "QDTG", allows the students to familiarize with the theoretical concepts about mass transfer unit operations, specifically the diffusion of a volatile liquid in an inert gas, obtaining very useful experimental data and results for the good practical understanding of the process and, therefore, for the technical training of the students.

Voir description générale

Description Générale

The Gaseous Mass Transfer and Diffusion Unit, "QDTG", allows the students to familiarize with the theoretical concepts about mass transfer unit operations, specifically the diffusion of a volatile liquid in an inert gas, obtaining very useful experimental data and results for the good practical understanding of the process and, therefore, for the technical training of the students.

The unit consists of a vertical capillary tube with a volatile solvent (liquid A) and gas (air), which will flow horizontally under laminar flow conditions in the upper end of the tube. This air is introduced by a blower.

The capillary tube is introduced in a controlled temperature thermostatic bath, which will work following the double boiler method. The solvent will be evaporated slowly due to the thermal energy of the bath. And due to the concentration gradient, the gaseous solvent will be dispersed upwards, from the surface of the liquid solvent towards the pure air. The air flow will transport the molecules of the solvent and the volume of the liquid solvent in the tube will be reduced. There is an optical system with fine focusing adjustment to measure this level difference.

Des exercices et pratiques guidées

EXERCICES GUIDÉS INCLUS DANS LE MANUEL

  1. Fick´s law application to calculate the diffusivity.
  2. Direct measurement of mass transfer rates.
  3. Determination of molar density transfer rate.
  4. Study of the effect of temperature on diffusion coefficients.
  5. Use of gas laws to calculate concentration differences in terms of partial pressures.
  6. Graphic representation of the concentration profiles.
  7. Gaining familiarity with the use of laboratory instruments to achieve measurements of data required for industrial process design.

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