Process for removing hydrazine from hydroxlyamine solutions

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 I and/or II

• wherein
• each of X1 and X2 is individually chosen from:
• H, OH, NR″2, OR′″, SH, halide or an optionally substituted hydrocarbyl group, with the proviso that not both of X1 and X2 are OH groups, wherein each R″ is independently chosen from:
• H or an optionally substituted hydrocarbyl group;
• R′″ is an optionally substituted hydrocarbyl group wherein two R′″ groups can also form an optionally substituted ring system;
• or R′″ is an alkali metal or NRV4, wherein each le is independently chosen from:
• H or an optionally substituted hydrocarbyl group;
• 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,
• with the proviso that R1 can form a ring system with X1.