ABSORCION: Problema de Conversión de Coeficientes Transferencia de Masa. Parte I

Problem Solving in Absorption Column

In this section, the speaker delves into solving a problem related to absorption focusing on individual and global mass transfer coefficients.

Coefficient of Transfer - Individual and Global

• The problem involves finding:

• Individual volumetric transfer coefficient in mol fraction of the average liquid phase.

• Individual volumetric coefficient in concentration gradient units of mol fraction in the average gas phase.

• Global mass transfer coefficient in concentration units of mol ratio of the gas phase.

• Given information includes:

• Gas mole fraction entering and exiting.

• Molecular weight of inert gas (air).

• Liquid molar ratio entering.

• Molecular weight of inert liquid (water).

Calculating Individual Transfer Coefficients

• For the liquid phase, calculations involve:

• Molar ratio and molecular weights.

• Average liquid density.

• Initiating with calculating individual monomeric transfer coefficient using concentration gradient for the average gas phase.

Determining Average Liquid Density

• Finding average liquid density involves:

• Weighted molecular weights calculation for liquids L1 and L2.

• Formula for average liquid density:

[ rho_L = fracrho_L1M_L1 + rho_L2M_L2M_L1 + M_L2 ]

Calculation Continuation

• Proceeding with determining molecular weights for liquids L1 and L2 to calculate average liquid density.

• Calculating molecular weight averages:

[ M_avg(L) = fracM_L1(x_a)+M_L2(1-x_a)2 ]

Finalizing Coefficients Calculation

• Substituting values into formulas to find individual volumetric coefficients based on calculated densities.

• The final result is an individual volumetric coefficient value.

Calculation of Global Mass Transfer Coefficient

This section focuses on calculating the global mass transfer coefficient after determining individual coefficients.

Determining Global Coefficient

• Utilizing previously calculated values to find the global mass transfer coefficient.

• Calculations lead to obtaining a value for the global mass transfer coefficient at the interface.

Interface Consideration