Effect of Adsorption

Adsorption acts in the opposite direction to vaporization. The building of a monomolecular layer of solvent vapour on the surface of the adsorbent, followed by the appearance of a multilayer adsorption film and possible capillary condensation in the smallest pores when the partial pressure is large, reduces progressively the layer porosity (for example from 0.75 to 0.50 within 15 min).

Let sT 0 be the bed porosity of the dry adsorbent and sT;t the porosity at time t when adsorption has begun:

where l is the width of the plate and v is the rate of vaporization per unit surface area.

v is the function of P0 — P, the difference between the vapour pressure P0 of the solvent and its partial

Here Vt is the total free volume at time t, given by

where S is the layer surface area and v' is the adsorption rate defined in the same way as v.

To move by dzf during dt, the solvent front must be supplied by a volume dV = ST, tel dzf [30]

coming from the solvent source and so:

Equating expressions for dV gives kv

Combination of the above equations using the same procedure as above gives:

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

Get My Free Ebook

Post a comment