Sucrose crystal growth. II. Rate of crystal growth in the presence of impurities

Abstract

The effects are described of supersaturation, temperature, and relative motion of solution and crystal on the rate of sucrose crystal growth from aqueous solutions containing a wide range of impurities. The results are consistent with the conclusion, drawn from data in pure sucrose solution, that two main steps, neither of which are clearly rate-controlling under the experimental conditions, are important in crystal growth kinetics. Impurities can be classified broadly as those which have their main effect on the mass transfer of sucrose from the bulk of the solution to the site of incorporation on the sucrose crystal, and those which exert their main effect by surface adsorption, hindering the incorporation of sucrose into the crystal lattice.