Water softening process

Details Water softening process Water softening process

1991-01-16

1992-10-06

Hruskoci, Peter

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210713, 210714, 210724, 210738, C02F 152

Patent

active

051529041

ABSTRACT:
Process for softening hard water by precipitation of calcium carbonate. The hard water is rendered alkaline, e.g. by the addition of sodium hydroxide, and is then contacted with a large excess of calcium carbonate crystals whose size does not exceed 100 microns, whereby precipitation occurs within a short contact time of the order of 2-60 seconds. Upon separation of soft water from calcium carbonate the bulk of the latter is recirculated and excessive amounts are removed.

REFERENCES:
patent: 3583910 (1971-06-01), Stoddard
patent: 3976569 (1976-08-01), Sheppard et al.
patent: 4207183 (1980-06-01), Herrigel
patent: 4209395 (1980-06-01), Berlenbach et al.
patent: 4670150 (1987-06-01), Hsiung et al.

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