The kinetics of heterogeneous solid-liquid reaction crystallizations - An overview and examples

Heterogeneous solid-liquid reactions leading to crystallization of products are discussed. Different macro kinetics of reacting solid particles can be found due to the combination of the dissolution process of the solid react ant, the actual reaction and the crystallization kinetics. Thereby, a surfa ce layer of the solid reactant which consists of the solid product being ge nerated is the dominant problem. Various examples of solid-liquid reaction crystallizations are discussed in order to give an overview about this topi c. Additionally, experimental work (production of boric acid and citric aci d) with the aim to improve solid-liquid reaction crystallizations is presen ted. If hydrates are involved in solid-liquid reaction crystallizations the ir stability dominately influences the overall reaction. It is shown that t he macro kinetics of solid-liquid reactions and their rates can be influenc ed trolled) by, e.g., an initially added amount of, e.g., the product or by product.