Cyclic process for producing taurine from monoethanolamine
AssigneeVitaworks IP, LLC
InventorSongzhou Hu
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Abstract
There is disclosed a cyclic process for producing taurine from monoethanolamine comprising the steps of: (a) reacting monoethanolamine with ammonium sulfate in the recycling mother liquor to yield monoethanolamine sulfate; (b) reacting the monoethanolamine sulfate with sulfuric acid to form 2-aminoethyl hydrogen sulfate ester; (c) subjecting the 2-aminoethyl hydrogen sulfate ester to a sulfonation reaction with ammonium sulfite to yield taurine and ammonium sulfate; (d) separating the taurine and the ammonium sulfate by means of solid-liquid separation; (e) removing the excess ammonium sulfite from the mother liquor to obtain an aqueous solution comprised of ammonium sulfate and (f) returning the aqueous solution to step (a) to complete the cyclic process.
Claims11
A process for producing monoethanolamine sulfate, comprising:
- (a) adding monoethanolamine to an aqueous solution comprised of ammonium sulfate to form an aqueous solution comprised of monoethanolamine sulfate and ammonia;
- and
- (b) heating the aqueous solution to remove the ammonia to yield an aqueous solution comprised of the monoethanolamine sulfate.
A cyclic process for producing taurine from monoethanolamine, comprising:
- (a) adding monoethanolamine to an aqueous solution comprised of ammonium sulfate and monoethanolamine sulfate to form an aqueous solution comprised of monoethanolamine sulfate and ammonia and heating the aqueous solution to remove the ammonia to yield an aqueous solution comprised of the monoethanolamine sulfate;
- (b) adding sulfuric acid to the aqueous solution comprised of the monoethanolamine sulfate of step (a) to form an aqueous solution comprised of monoethanolamine bisulfate;
- (c) heating the aqueous solution comprised of the monoethanolamine bisulfate of step (b) and optionally added monoethanolamine bisulfate prepared from the reaction of monoethanolamine and sulfuric acid to yield 2-aminoethyl hydrogen sulfate ester;
- (d) reacting the 2-aminoethyl hydrogen sulfate ester with ammonium sulfite in an aqueous solution to yield an aqueous solution comprised of taurine and ammonium sulfate;
- (e) separating the taurine and the ammonium sulfate by means of cooling crystallization and a solid-liquid separation to give an aqueous mother liquor solution comprised of monoethanolamine sulfate, ammonium sulfite, and the dissolved ammonium sulfate;
- and
- (f) removing the ammonium sulfite from the aqueous mother liquor solution to obtain an aqueous solution comprised of the ammonium sulfate and monoethanolamine sulfate and returning the aqueous solution to step (a).
Dependencies are inferred from the claim text.