Mr. Matheny has 34 years of experience in the chemical industry, much of it involving the design, construction, and operation of pilot plant facilities and production units for Union Carbide and Dow Chemical. His experience includes high pressure laboratory operations, ethyleneamines and ethanolamines experimental units, and production unit support. He has spent several years at manufacturing locations participating in the construction and startup of new production facilities.
Crystallization involves purification of a chemical from a liquid mixture by solidification of the desired component. Crystallization falls into two main categories: solution crystallization and crystallization from the melt (also referred to as “fractional crystallization”). Solution crystallization means a material is crystallized from a mixture containing a solvent. Crystals are formed by either concentrating the desired component by evaporation or cooling or both, and the solid phase is typically formed at a temperature well below its pure component freezing point. In melt crystallization, no solvent is added. The crystals are generated by cooling of the “melt” and are formed at a temperature near the pure-component freezing point. The product is collected in its melt form, and solids handling can be largely avoided for some process designs particularly if the product is desired in a liquid form.