Studies on Falling Film Crystallization Process and Its Numerical Simulation;

The influence of various process parameters including crystallization time,initial inlet temperature of cooling oil and melt concentration on falling film crystallization is discussed for falling film taking place on the external surface of a central tube.

p-Dichlorobenzene was sperated from binary system of dichlorobenzenes using distillation—falling film crystallization hybrid processes.

From the beginning of the basic concept of fractional crystallization from the melt , some thermodynamic problems such as crystal structure, solid solution, nucleus forming and growing-up, have been discussed by means of bond parameters in combination with the thermodynamic data.

Coupled with the living examples of refining metal by fractional crystallization,the kinetic formula of fractional crystallization in the refining of metals were deduced according to the concepts of diffusion and effective coefficient of separation and criteria for the effective of fractional crystallization.

While preserving the advantages of the original Witten process for manufacturing DMT,an improved Witten process has been developed featuring the use of new reactors and advanced separation technology including mixed oxidation,mixed esterification,vacuum crystallization,special rectification and fractional crystallization.