Process for concentrating sulfuric acid in an evaporator

Details Process for concentrating sulfuric acid in an evaporator Process for concentrating sulfuric acid in an evaporator

1981-11-09

1983-10-11

Bascomb, Jr., Wilbur L.

Concentrating evaporators

Processes

159 31, 55185, 202197, 203 12, 203 40, 203 42, 423522, 423531, B01D 100, C01B 1790

Patent

active

044090641

ABSTRACT:
This invention relates to an improved process for reducing solute in a vapor stream and, particularly, to the adaption of this process in concentrating solutions in an evaporator wherein the solution is heated to volatilize solvent. The improvement 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 ft.sup.2 /ft.sup.3, 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.

REFERENCES:
patent: 3334027 (1967-08-01), Goeldner
patent: 3634201 (1972-01-01), Kehse
patent: 3661732 (1972-05-01), Withrow
patent: 3944401 (1976-03-01), Dorr et al.
patent: 3970511 (1976-07-01), Rat et al.
patent: 4138309 (1979-02-01), Kuhnlein

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