Method for the regeneration of pickling acids

Details Method for the regeneration of pickling acids Method for the regeneration of pickling acids

1979-12-07

1981-03-10

Peters, G. O.

Chemistry of inorganic compounds

Nitrogen or compound thereof

Oxygen containing

134 12, 134 13, 423484, 423DIG1, C01B 2146

Patent

active

042554071

ABSTRACT:
A method for the regeneration of spent pickling acids. Said acid is mixed with such a minor quantity of a stronger acid that the losses of said stronger acid are compensated. The mixture obtained is stripped, whereby the weaker acids are vaporized. The vapor phase containing the weaker acids is passed to a condenser. The condensate obtained forms the regenerated pickling acid. The spent pickling acid can also be passed directly to an evaporator in which a solution containing a stronger acid is circulated. The vapor from the evaporator is passed to an absorption column and thereafter to a condenser, the regenerated acid being formed of the condensate from said condenser.

REFERENCES:
patent: 1832853 (1931-11-01), Bennet
patent: 2993757 (1961-07-01), Dasher et al.
patent: 3787306 (1974-01-01), Senior et al.
patent: 3840646 (1974-10-01), Sugimoto et al.

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