Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1997-04-15
1999-03-09
Hruskoci, Peter A.
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210724, 210726, 210737, C02F 152
Patent
active
058795626
ABSTRACT:
A multi-stage process is provided for treating a water to reduce its hardness. The feed water is initially heated to a thermal reaction temperature in a heating stage. The heated water is then maintained at or near the thermal reaction temperature for a sufficient residence time to thermally react the water, producing a first portion of a scale from the scale-forming ions in the water while discharging dissolved gases from the water. After the thermal reaction stage, one or more chemical additives in the form of a hydroxide ion donor and optionally a bicarbonate ion donor are added to the heated water in a chemical reaction stage. The chemical additive is chemically reacted with the water in the chemical reaction stage, producing a second portion of the scale from the scale-forming ions in the water. A treated water having a reduced hardness is recovered from a sludge settling stage and the scale produced by the thermal and chemical reaction stages is discharged from the water and accumulated in a sludge accumulation stage for withdrawal from the process.
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Ebel Jack E.
Hruskoci Peter A.
Hummel Jack L.
Marathon Oil Company
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