Addition of finely divided BaSO.sub.4 particles to sea water for removal of scale components
First Claim
1. In a process for reducing scale deposition in a distillation apparatus used for distilling sea water, the improvement comprising adding barium sulphate in the form of finely divided particles in suspension to said sea water, maintaining said sea water continuously in motion, thereby maintaining said particles in constant suspension in said sea water, and heating said sea water with said barium sulphate particles in suspension to a temperature at which the calcium sulphate present in said sea water is supersaturated, said particles acting as precipitation nuclei for said calcium sulphate initially present in said sea water.
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Abstract
A process of reclaiming drinking and industrial water from sea water, accing to which the sea water to be processed is subjected to a pretreatment, comprising filtering, acidifying and degassing said sea water. To the thus treated sea water there is then added in suspension finely divided barium sulphate to provide nuclei for the crystal growth of calcium sulphate on the barium sulphate. The thus obtained suspension is then in a continuous process heated and partly evaporated, during which process, temperatures of supersaturation, with respect to calcium sulphate are reached, the water which is evaporated being collected as condensate and distillate.
28 Citations
18 Claims
- 1. In a process for reducing scale deposition in a distillation apparatus used for distilling sea water, the improvement comprising adding barium sulphate in the form of finely divided particles in suspension to said sea water, maintaining said sea water continuously in motion, thereby maintaining said particles in constant suspension in said sea water, and heating said sea water with said barium sulphate particles in suspension to a temperature at which the calcium sulphate present in said sea water is supersaturated, said particles acting as precipitation nuclei for said calcium sulphate initially present in said sea water.
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16. In a process for reducing scale deposition in a distillation apparatus for distilling sea water, the improvement comprising adding barium sulphate in the form of finely divided particles in suspension to said sea water, maintaining said sea water continuously in motion, thereby maintaining said particles in constant suspension in said sea water, and heating said sea water with said barium sulphate particles in suspension to a temperature at which the calcium sulphate present in said sea water is supersaturated, said particles acting as precipitation nuclei for said calcium sulphate initially present in said sea water, removing sludge formed of said barium sulphate and calcium sulphate, dissolving out said calcium sulphate in cold water, and separating said barium sulphate and returning it to fresh sea water to continue the separation of calcium sulphate.
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17. In a process for reducing scale deposition in a distillation apparatus used for distilling sea water, including subjecting the sea water to a pretreatment comprising filtering, acidifying and degassing said sea water, the improvement comprising adding barium sulphate in the form of finely divided particles in suspension to said sea water, maintaining said sea water continuously in motion, thereby maintaining said particles in constant suspension in said sea water, and heating said sea water with said barium sulphate particles in suspension in a continuous multi-stage flash evaporator to a temperature to distill off part of the water and at which temperature the calcium sulphate present in said sea water is supersaturated, said particles acting as precipitation nuclei for said calcium sulphate initially present in said sea water, and collecting the evaporated portion of said water as condensate and distillate.
Specification