Date of Award


Document Type


Degree Name

Master of Science (MS)


Chemical Engineering


The rate and extent of sodium removal from lignite by ion exchange were studied using calcium chloride solutions. The experimental apparatus consisted of a centrifugal stirring device in a limited bath. Four variables, rotation speed, calcium chloride concentration, particle size, and moisture content were considered.

It was determined that rotation speed had no discernable effect on the rate or extent of sodium removal. Particle size and moisture content, however, do have considerable effect on the rate and extent of sodium removed. It was also found that as the calcium chloride concentration was decreased the exchange approached theoretical stoichiometric proportions.

The observed phenomena were found to agree quite well with a physical model of lignite first postulated by Lavine.