Process for removing hydrazine from hydroxlyamine solutions
AssigneeCytec Technology Corp.
InventorsMorris Lewellyn, Alan S. Rothenberg, Haunn-Lin Tony Chen, Lino G. Magliocco, Thomas P. Sassi
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Abstract
The present invention relates to processes for reducing or eliminating the amount of hydrazine from a hydroxylamine-free base containing hydrazine by treating said hydroxylamine-free base with a scavenger agent, and to the hydroxylamine-free base thereby obtained, as well as to its use for producing microdispersions containing a hydroxamated polymer for use as a flocculant in the Bayer process.
Claims6
A process for reducing the amount of hydrazine from a hydroxylamine-free base containing hydrazine, the method comprising treating said hydroxylamine-free base with a scavenger agent chosen from compounds of formula II
- wherein
- X3 is chosen from:
- O, NR′, S, or PR′, wherein R′ is chosen from:
- H, OH, alkali metal, NRIV2 or alkyl, wherein each RIV is independently chosen from:
- H or an optionally substituted hydrocarbyl group;
- R is chosen from:
- CR1R2 where each of R1 and R2 is independently chosen from:
- H or an optionally substituted hydrocarbyl group, wherein R1 and R2 together can also form an optionally substituted ring;
- R3C═CR4 where R3 and R4 together form an optionally substituted ring;
- and
- R5R6C—CR7R8 where R5 and R7 together form an optionally substituted ring, and
- wherein each of R6 and R8 is independently chosen from:
- H, or an optionally substituted hydrocarbyl group.
Dependencies are inferred from the claim text.