Apparatus for and method of preparing crystals for washing

Details Apparatus for and method of preparing crystals for washing Apparatus for and method of preparing crystals for washing

1981-09-21

1983-09-27

Sever, Frank

Refrigeration

Processes

Fractionally solidifying a constituent and separating the same

62542, B01D 904

Patent

active

044066791

ABSTRACT:
The invention relates to an apparatus for and method of preparing a slurry for a purification apparatus such as a wash column. A slurry is produced in a crystallizer. The crystals are essentially removed from the concentrated mixture and transported to a more dilute solution. The crystals are caused to dwell in the dilute solution to permit the crystals to ripen and to grow in size significantly.
The apparatus that performs the foregoing functions is a gradient column where the change from a concentrated slurry to a dilute slurry takes place. The output of the gradient column is coupled to a holding tank where the residence time of crystals in the dilute solution is prolonged to permit the crystals to ripen.

REFERENCES:
patent: 3501275 (1970-03-01), Sailer et al.
patent: 3662562 (1972-05-01), Wiegandt et al.
patent: 4279130 (1981-07-01), Finch

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