Method for the manufacture of an ammonium sulfate composition
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United States of America Patent
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Jul 30, 2013
Grant Date -
Mar 14, 2013
app pub date -
Apr 13, 2011
filing date -
Apr 19, 2010
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Abstract
The present invention describes a method manufacture of an ammonium sulfate composition having a total organic carbon (TOC) content of 1% by weight or less than 1% by weight, based on the total weight of the composition, comprising the following steps:
- a) reacting i) waste sulfuric acid comprising an organic tertiary amines with ii) ammonia in an amount sufficient to obtain a pH of 9.5 or higher b) separating the organic tertiary amine from the reaction mixture obtained in step a) wherein during the separation the pH of the reaction mixture is maintained at a pH higher than 10 andc) optionally reducing the content of water and/or other volatile components from the aqueous solution comprising the ammonium sulfate.
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