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US 7,172,744 B2Granted
Process for manufacturing highly concentrated hydroxylamine
AssigneeBASF SE
InventorChin-Hsiung Chang
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Abstract
An improved ion exchange process for manufacturing and concentrating hydroxylamine from an aqueous solution comprising hydroxylammonium ion and counter anions is disclosed. The process involves the use of an aqueous hydroxylamine wash step which assists in controlling the processing temperature and leads to a more concentrated, purified aqueous hydroxylamine solution.
Claims17
A process for manufacturing hydroxylamine comprising the following steps:
- (a) feeding an aqueous feed solution comprising hydroxylammonium ion and contaminants into a container containing at least one cation exchange resin to form a hydroxylammonium ion loaded resin;
- (b) feeding a water wash into said container to wash said loaded resin to remove said contaminants to form a purified hydroxylammonium ion loaded resin having said wash water associated therewith;
- (c) feeding an aqueous solution comprising hydroxylamine into said container to displace at least a portion of said associated wash water from said purified loaded resin to form a hydroxylamine solution associated resin;
- (d) feeding an aqueous desorbent into said container to desorb said hydroxylammonium ion from said associated resin to form an unbound hydroxylamine containing aqueous solution;
- (e) feeding a rinse water feed into said container to remove said unbound solution from said container to form a pure and concentrated aqueous solution comprising said hydroxylamine,
- and wherein step (c) is conducted prior to step (d).
3 more elements
Dependencies are inferred from the claim text.