Method for continuously filtering raw brine for use in chlor-alkali electrolysis
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United States of America Patent
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Jul 18, 2006
Grant Date -
Feb 24, 2005
app pub date -
Feb 24, 2003
filing date -
Mar 8, 2002
priority date (Note) -
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Abstract
The method of continuously processing raw brine with a solids content to obtain substantially solids-free pure brine (E) for use in chlor-alkali electrolysis. In this method the raw brine (A) is separated, by means of a decanter (1), into a clear brine (B) with a lower solids content and an underflow (C) with a higher solids content, and the entire clear brine (B) and a metered fraction of the underflow (C) are supplied to a backwash pressure filter (5), from which the substantially solids-free pure brine (E) and a thickened slurry (F) are separately removed. The metered fraction and the clear brine (B) are controlled so that a solids concentration at an inlet to the pressure filter is 5 to 10 times that of a solids concentration in the clear brine (B), which stabilizes operations and increases filtration output.
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