Adsorption and Desorption Kinetics and Equilibrium of Calcium Lgnosulfonate on Dolomite Porus Media


Calcium lignosulfonate (CLS) adsorption and desorption on a porous dolomite rock have been studied. Kinetic results showed that both adsorption and desorption are time-dependent processes, not instant. It has been found that adsorption and desorption have a two-step pattern: a fast adsorption/desorption followed by a slow step. Apparent adsorption and desorption rate constants were calculated by a second-order kinetic model. Desorption is an unequilibrated process under normal injection flow rate, and it is much slower than adsorption. Equilibrium results show that adsorption and desorption of CLS onto dolomite can be well fitted by the Freundlich equation over the experimental CLS concentration range and that increase of CLS concentration increases adsorption density. Increasing temperature slightly decreases CLS equilibrium adsorption. Increase of NaCl and CaCl2 concentrations in brine increases adsorption density, but CaCl2 has a much stronger effect than NaCl on the adsorption.


Geosciences and Geological and Petroleum Engineering

Keywords and Phrases

Adsorption densities; Adsorption/desorption; Apparent adsorption; Calcium lignosulfonate; Concentration ranges; Desorption kinetics; Desorption rate constants; Dolomite rocks; Equilibrium adsorption; Freundlich equations; Injection flow rate; Porous Media; Second order kinetics; Step patterns; Time-dependent process; Calcium; Porous materials

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Article - Journal

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© 2009 American Chemical Society (ACS), All rights reserved.

Publication Date

01 Aug 2009