Cross-flow microfiltration lime softener

Details Cross-flow microfiltration lime softener Cross-flow microfiltration lime softener

C - Chemistry, Metallurgy

02

F

362/46, 362/63

C02F 5/00 (2006.01) C02F 5/02 (2006.01)

Patent

CA 1243786

ABSTRACT OF THE DISCLOSURE A method for softening a fluid containing hardness constitu- ents, comprising the steps of: (a) mixing the fluid with suffi- cient amounts of a softening agent, and previously precipitated hardness constituents in a reactor to establish a softening reaction in the reactor for precipitating a substantial portion of the hardness constituents contained in the fluid; (b) removing a portion of the fluid and precipitated hardness constituents from the reactor as a slurry and filtering the slurry through a cross-flow microfiltration module containing at least one elon- gated filtration tube, whereby substantially all of the precipitated hardness constituents are removed from the portion of the fluid exiting from the module as filtrate; and (c) returning at least a portion of the filtered out precipitated hardness constituents exiting from the module to the reactor as the previously precipitated hardness constituents. Also disclosed is an apparatus for softening a fluid containing hardness constituents, comprising: (a) a reactor for mixing the fluid with sufficient amounts of a softening agent and previously precipitated hardness constituents to establish a softening reaction in the reactor for precipitating a substantial portion of the hardness constituents contained in the fluid; (b) means for removing a portion of the fluid and precipitated hardness constituents from the reactor as a slurry; (c) a cross- flow microfiltration module containing at least one elongated filtration tube for filtering the slurry to remove substantially all of the precipitated hardness constituents from the portion of the fluid exiting from the module as filtrate; and (d) means for returning at least a portion of the filtered out precipitated hardness constituents exiting from the module to the reactor as the previously precipitated hardness constituents.

455182

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