Ind. Eng. Chem. Prod. Res. Dev. 1982, 27, 349-352
349
Effect of Electrolyte on the Stability of Barium Sulfate Dispersions in the Presence of Sodium (Carboxymethyl)cellulose Peter A. Williams, Raymond Harrop,' Glyn 0. Phillips, and Ian D. Robb The North E Wales Institute of Higher Education, Kelsterton College, Connah's Quay, DeesMe. Clwyd, Wales CH5 4BR
Geoflrey Pass Department of Chemlstw and Applied Chemlstfy, University of Salford, Salford, England M5 4WT
The adsorption of sodium (carboxymethy1)cellulose (SCMC) onto BaSO, crystals and the consequent influence on the collold stability of the dispersion has been studied. The adsorption capacity increased as the charge density of the polyelectrolyte decreased, and the addition of electrolyte enhanced the adsorption by an amount which depended on the nature of the ions presefit. In pure water all charge density types of SCMC had flat configurations, but addltion of electrolyte caused more segments to extend into solution. Following adsorption of SCMC to adsorption capacity, but in the absence of excess SCMC, the &SO4 dispersions were readily flocculated by electrolyte (
