Process for concentrating dilute solutions in an evaporator

Details Process for concentrating dilute solutions in an evaporator Process for concentrating dilute solutions in an evaporator

B - Operations, Transporting

01

D

161/31

B01D 1/30 (2006.01) B01D 1/16 (2006.01) C01B 17/88 (2006.01)

Patent

CA 1142424

174-P-US02404 IMPROVED PROCESS FOR REDUCING SOLUTE CONCENTRATION IN A VAPOR STREAM ABSTRACT OF THE DISCLOSURE This invention relates to an improved process for re- ducing solute in a vapor stream and, particularly, to the adap- tion of this process in concentrating solutions in an evaporator wherein the solution is heated to volatilize solvent. The improve- ment for reducing solute in the vapor stream resides in (a) the utilization of a wire mesh mist eliminator pad having a wire diameter of from 0.001-0.05 inches, an interfacial area from 50- 200 ft2/ft3, a void space of about 90-99 percent and a packing thickness of 4-16 inches and (b) spraying a liquid through the mist eliminator pad, the liquid being sprayed uniformly over the surface of the mist eliminator pad at a rate of 0.6-2.5 pounds liquid per pound of vapor to provide a wetting rate of 0.1-0.25 gallons per minute per square foot of mist eliminator surface area. The process has been particularly advantageous in the multistage concentration of corrosive products particularly in the concentration of a 60-70% sulfuric acid solution to about 93 percent.

337573

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