Ion exchange methods for removing biuret from urea
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United States of America Patent
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Mar 17, 1987
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N/A
app pub date -
Dec 30, 1983
filing date -
Dec 30, 1983
priority date (Note) -
Expired
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Abstract
Methods are provided for removing biuret from biuret-containing aqueous urea solutions by contacting the biuret-containing urea solutions with the hydroxide ion form of an anion exchanger under anion exchange conditions in which methods one or more aqueous process streams are either formed from materials which are substantially or completely free of alkaline earth metal and/or carbonate impurities or which process streams are treated either before or during their use in the anion exchange process to reduce their content of contaminant alkaline earth metal and/or carbonate compounds. The anion exchanger can be washed and regenerated with one or more aqueous media including water, aqueous solutions of strong base, acidic chloride solutions, and/or other aqueous solutions, and either batch or continuous (fixed bed) contacting can be employed. The use of one or more aqueous process streams in such methods which have been prepared from aqueous media of relatively low alkaline earth metal and/or carbonate content or which are treated either before or during their use in the methods of this invention, markedly reduces the degree and rate of anion exchanger deactivation and the severity of regeneration required to restore anion exchanger activity and thereby markedly increases anion exchanger efficiency and useful life.
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