Process for concentrating and purifying aqueous sulphuric acid s

Details Process for concentrating and purifying aqueous sulphuric acid s Process for concentrating and purifying aqueous sulphuric acid s

1978-09-20

1979-09-25

Cuchlinski, Jr., William A.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

23305F, 23306, 159DIG19, B01D 100

Patent

active

041690540

ABSTRACT:
Concentrated sulphuric acid aqueous solutions, stably clear through the time, are obtained starting from diluted sulphuric acid aqueous solutions containing Mg and possibly other impurities such as Fe, Al, Cr, V and Mn, by evaporation concentration. The process is characterized in that, before filtering, the slurry obtained by evaporation concentration, is cooled down to 10.degree.-25.degree. C. and maintained at this temperature for not less than 12 hours.

REFERENCES:
patent: 1960348 (1934-05-01), Pongratz
patent: 3121620 (1964-02-01), Zirngibl et al.
patent: 3211538 (1965-10-01), Gross et al.

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