Stabilization of softened water with self-generated CO.sub.2

Details Stabilization of softened water with self-generated CO.sub.2 Stabilization of softened water with self-generated CO.sub.2

1981-03-27

1982-12-28

Hruskoci, Peter A.

Liquid purification or separation

Processes

Preventing, decreasing, or delaying precipitation,...

202173, 203 7, 203 11, 210712, 210718, 210737, 210188, 210199, C02F 106, C02F 120, C02F 502

Patent

active

043660665

ABSTRACT:
Apparatus and a method of adding CO.sub.2 to softened water flowing through a series of interconnected flash chambers after the softened water has been directed out of a settler. The inlet of the settler receives preheated hard water after the hard water has passed through a series of interconnected preheating chambers, there being a preheating chamber for each flash chamber, respectively. Each preheating chamber and the corresponding flash chamber comprise a stage of a multi-stage water softening system, the preheating and flash chambers of each stage being separated by a partition defining an opening near the top portion of the stage to place the respective first and second chambers of each stage in fluid communication with each other and to allow flashed, heated water vapor from the flash chamber to pass into direct, admixing contact with cooler, hard water sprayed into the preheating chamber to preheat the hard water. As the hard water is preheated by the flashed water vapor in each preheating chamber, CO.sub.2 is evolved and then directed into a predetermined flash chamber, such as the flash chamber of the next downstream stage with reference to the direction of flow of softened water through the stages. The CO.sub.2 stabilizes the softened water and reduces its pH. The CO.sub.2 evolved from the settler is also directed into a flash chamber, such as the upstream flash chamber for stabilization and pH lowering purposes.

REFERENCES:
patent: 3119752 (1964-01-01), Checkovich
patent: 3218241 (1965-11-01), Checkovich
patent: 3814671 (1974-06-01), Roller
patent: 4018656 (1977-04-01), Rogers et al.
patent: 4138851 (1979-02-01), Rogers et al.
patent: 4247371 (1981-01-01), Roller

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