Experimental direct-contact crystallizer for mirabilite

The All-Union Research Institute for Halurgy carried out laboratory investigations of a new method for crystallization of mirabilite from connate brine by direct contact with an immiscible dispersed refrigerant. A scale up unit was manufactured, and is schematicized. The process of the unit and the control system are described in detail. The flow rates and temperatures of the continuous and disperse phases at the column inlet and outlet, the chemical composition of the starting solution, the residual kerosene, and the grain size distribution of the crystals were all determined. On the basis of the results of industrial tests, a technical assignment was developed for a pilot model of the unit.