Swenson Technology, Inc.

40'-6" diameter forced-circulation mechanical recompression  evaporative crystallizer at the Montedison plant in  Ciro Marina, Italy

SWENSON Forced-Circulation Crystallizer used for producing sodium sulfate at American Cyanamid's Forth Worth, Texas facilities

For applications where high evaporation rates are required

     For feeds where high rates of evaporation are required, where there are scaling components, or when crystallization must be achieved in solutions with inverted solubility or relatively high viscosity, the SWENSON Forced-Circulation Crystallizer is the best choice. 

This type of unit -also known as the circulating magma crystallizer or the mixed suspension-mixed product removal (MSMPR) crystallizer - consists of a body sized for vapor release with a liquid level high enough to enclose the growing crystals.  Suction from the lower portion of the body passes through a circulation pump and a heat exchanger and returns to the body through a tangent or vertical inlet.  The heat exchanger is omitted when adiabatic cooling is sufficient to produce a yield of crystals

     The most common use of this crystallizer is as an evaporative crystallizer with materials having relatively flat or inverted solubility.  It is also useful with compounds crystallized from solutions with scaling components.

Controlled supersaturation

     When the heat exchanger is used, it is normally one- or two-pass and is designed for relatively low temperature rises in the solution.  This limits the supersaturation of scaling components when heating materials of inverted solubility.  In most applicatons, the steam-to-liquid, delta-T is also limited to prevent mass boiling within the tubes or vaporization at the tube wall.

Copyright 2009 Swenson Technology, Inc.