Process for preparing a substantially pure aqueous solution of h

Details Process for preparing a substantially pure aqueous solution of h Process for preparing a substantially pure aqueous solution of h

1996-02-15

1998-01-06

Bhat, Nina

Distillation: processes, separatory

Vaporization zone under positive pressure or vacuum

Including the addition of water or steam

203 96, 203 98, 159DIG15, B01D 300, B01D 310

Patent

active

057050406

ABSTRACT:
A process for preparing a substantially pure aqueous solution of hydrogen peroxide is described. An impure hydrogen peroxide solution is vaporized in a vaporizer to form a vapor containing hydrogen peroxide and a concentrated hydrogen peroxide solution in equilibrium therewith. The solution also contains impurities. A substantially pure hydrogen peroxide solution is obtained by a partially condensing the vapor containing hydrogen peroxide. In addition to the solution, a residual vapor, in equilibrium with the solution and having a lower hydrogen peroxide concentration, can be condensed in a separate condenser. The concentration of the hydrogen peroxide solution obtained by the process can be regulated, for example, by regulating the condensation efficiency of the partial condensation.

REFERENCES:
patent: 3617219 (1971-11-01), Cook, Jr.
patent: 5232680 (1993-08-01), Honig et al.
patent: 5296104 (1994-03-01), Signorini et al.
patent: 5456898 (1995-10-01), Shimokawa et al.
"Purification of Hydrogen Peroxide Aqueous Solutions," Chemical Abstracts 69:55300 (circa 1968).

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