DESIGN THEORIES OF CRYSTALLIZERS AND THEIR INDUSTRIAL APPLICATION

摘要

Industrial crystallization is discussed on the unit operation of chemical industrial processes in future and prospected to become more important. Chemical engineers on industrial crystallization are expected to make optimum crystallizers designed to produce desired crystals. Design theories of industrial crystallizers are summarized and their industrial applications are discussed. And development of industrial crystallization processes is mentioned. A: design factor decided by production rate, product size, growth rate and suspension density in table 4 [m~3]; C.F.C.: characteristic factor for crystallization in table 4 [-]; C: concentration [kmol·kg~(-1)(H_2O) or kmol·m~(-3)] ; ΔC: supersaturation [kmol·kg~(-1)(H_2O) or kmol·m~(-3)]; f': secondary nucleation rate per unit surface area of a seed crystal [number/m~4sec]; f'(e): feed rate to, or removal rate of number of crystal of size "e" from a crystallization [number/sec,m~2]; g(e): number of crystal of size "e" suspended in a crystallizer [number,m]; kv: shape factor [-]; e: crystal size [m]; ew: dominant size [m]; M: molecular weigh [kg/kmol]; m: uniformity number on population basis [-]; n: uniformity number on weight basis [-]; P: production rate [g/s]; r: relative cumulative or weight of product crystal [-]