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US 12,398,091 B2Granted
Process for the purification of a mixture comprising N-alkyl-hydroxylammonium salts
AssigneeBASF SE
InventorsJaroslaw Michael Mormul, Dieter Kolassa, Dominic Riedel, Joaquim Henrique Teles, Ansgar Gereon Altenhoff, Richard Dehn, Peter Oechsle
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Abstract
The present invention relates to a process for purification of a mixture comprising water, N-alkyl-hydroxylammonium salts and some byproducts wherein from the mixture water and byproducts are distilled off until the purity of N-alkyl-hydroxylammonium salts in the residue is 95% or higher and additionally keeping the water content during and after the distillation≥40 wt.-% according to the residue.
Claims13
Process for the purification of a mixture comprising three compounds:
- a) water,
- b) 1 to 60 wt.-% of N-alkyl hydroxylammonium salt of formula I and
- wherein:
- R1, R2, R3 each independently are selected from the group of H, methyl, ethyl, n-propyl, isopropyl, n-butyl, 2-butyl and tert-butyl,
- X is selected from Cl, SO4, PO4, CH3COO, (COO)2,
- n dependent of the valence of X in water is a natural number selected from the group of 1, 2 and 3 and
- c) byproducts
- wherein the process comprises the following steps:
- I) putting the mixture into a purification apparatus,
- II) bringing the mixture in contact with steam
- III) removing a composition comprising water vapor and the byproducts in c) by distillation until the purity of the compound of formula I in b), in the residue is 95% or greater wherein the amount of water in the residue remains during and after the distillation≥40 wt. %.
8 more elements
Dependencies are inferred from the claim text.