Methods for removing biuret from urea by ion exchange
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United States of America Patent
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Apr 14, 1987
Grant Date -
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 which methods involve contacting a quantity of a biuret-containing aqueous urea feed solution with the hydroxide ion form of an anion exchanger under conditions sufficient to remove at least a portion of the biuret from the feed solution, and regenerating the resulting biuret-containing anion exchanger, at least in part, by contact with a substantially non-alkaline aqueous regenerant under conditions sufficient to remove at least a portion of the biuret from the anion exchanger. After completion of the described contacting with the substantially non-alkaline aqueous regenerant, the anion exchanger can optionally be further regenerated by contact with an aqueous solution of a strong base to remove additional quantities of biuret and/or other anion exchanger contaminants such as alkaline earth metal and carbonate ions and/or compounds. Methods are also provided in which one or more of the aqueous process streams which contact the anion exchanger have been treated (or comprise aqueous media which have been treated) to reduce the concentration of alkaline earth metal compounds and/or carbonate in such aqueous process streams.
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