Process for the regeneration of an aqueous process liquid of the amine-oxide process
AssigneeLenzing Aktiengesellschaft
InventorsPeter Harfmann, Stephan Astegger
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Abstract
The invention is concerned with a process for the destruction of N-nitrosomorpholine in an aqueous solution containing N-nitrosomorpholine and a peroxidic oxidant, characterized in that said aqueous solution is exposed to ultraviolet radiation having a wavelength of substantially 254 nm.
Claims12
A process for the destruction of N-nitrosomorpholine in an aqueous solution containing N-nitrosomorpholine and a peroxidic oxidant, comprising the steps of exposing said aqueous solution to ultraviolet radiation.
A process for the production of an aqueous solution of N-methylmorpholine-N-oxide, comprising the following steps:
- (a) providing an aqueous solution containing N-methylmorpholine and morpholine;
- (b) treating said aqueous solution with a peroxidic oxidant to oxidize N-methylmorpholine to N-methylmorpholine-N-oxide, and
- (c) exposing said aqueous solution to ultraviolet radiation emitted by a mercury low-pressure lamp.
A process for the regeneration of N-methylmorpholine-N-oxide from a spent precipitation bath produced in the amine-oxide process, comprising the following steps:
- (a) purifying the spent precipitation bath;
- (b) evaporating water from the purified precipitation bath, thereby producing a concentrated, aqueous N-methylmorpholine-N-oxide and vapours, said vapours being condensed and containing N-methylmorpholine-N-oxide, N-methylmorpholine and morpholine;
- (c) removing water from the condensed vapours to concentrate the condensed vapors, wherein the water removal is not carried out by means of evaporation;
- (d) treating the condensed, concentrated vapours with a peroxidic oxidant to oxidize N-methylmorpholine to N-methylmorpholine-N-oxide,
- (e) exposing the condensed, concentrated vapors to ultraviolet radiation emitted by a mercury low-pressure lamp, and
- (f) regenerating the condensed, concentrated vapors to recover N-methylmorpholine-N-oxide.
Dependencies are inferred from the claim text.