VINYLCHLORIDE SORPTION BY DRY CASEIN PARTICLES: MECHANISTIC CONSIDERATIONS

Publisher Website
Google Scholar
Abstract
Sorption of vinylchloride (VCM) by dry casein particles was determined as a function of temperature and moisture content. The amount sorbed was found to increase with a decrease in temperature or reduction in moisture content of the particles. At 30° C, the partition coefficient values (Ku) were 1.05, 0.4 and 0.33 × 102 for casein particles of moisture content 3.5, 6.0 and 7.5, weight percent respectively. The partition coefficient was defined as the equilibrium concentration of VCM sorbed over the sorbate concentration in the headspace. The effect of dipole moment of the sorbate on sorption to casein was evaluated by comparing sorption of VCM and the analogues, ethylene and vinylidene chloride. Sorption was found to increase with the dipole moment of the sorbate, suggesting the importance of dipole moment as a sorption inducing factor. Further supportive evidence for the importance of dipole moment in sorbate‐casein interaction was obtained by a gas chromatographic technique (inverse phase gas chromatography). Using casein as the stationary phase of a gas chromatographic column, the solutes VCM, ethylene, vinylidene chloride (VCD) and hexane were pulsed through the column and the peak shapes recorded. Peak shapes indicated an interaction between casein and the polar solutes (VCM and VDC) whereas no such interaction (sorption) was indicated for the nonpolar solutes, ethylene and hexane. A rate model for VCM sorption by dry casein particles was also developed.

This publication has 4 references indexed in Scilit: