Process of removing organic halogen-containing compounds
View Patent ↗The present invention relates to a process of removing organic halogen-containing compounds from a liquid stream mainly containing one or more of the compounds selected from the group consisting of glycol, water and alcohol, which process involves contacting the stream with an ion-exchange material containing basic anions selected from the group of hydroxide, carbonate and bicarbonate.
1. A process for removing organic halogen-containing compounds from a liquid stream mainly containing one or more of the compounds selected from the group consisting of glycol, water and alcohol, which process comprises contacting the stream with an ion-exchange material containing basic anions selected from the group of consisting of hydroxide, carbonate and bicarbonate.
2. The process of claim 1 , wherein the removal is performed at a temperature in the range of from 60° C. to 100° C.
3. The process of claim 1 , wherein the stream is produced by a process comprising the steps of:
(a) reacting an alkylene oxide with carbon dioxide in the presence of a halide-containing catalyst to obtain a reaction mixture containing the corresponding alkylene carbonate;
(b) contacting the reaction mixture obtained in step (a) with water and/or alcohol in the presence of a suitable catalyst to obtain a reaction mixture containing glycol; and,
(c) optionally separating at least part of the glycol formed in step (b).
4. The process of claim 3 , wherein the removal is performed at a temperature in the range of from 60° C. to 100° C.
5. The process of claim 3 , wherein the halide-containing catalyst of step (a) is a phosphonium salt.
6. The process of claim 3 , wherein the halide-containing catalyst of step (a) contains iodide.
7. The process of claim 3 , wherein the halogen containing compounds are at least in part 1,2-halohydrin compounds.
8. The process of claim 3 , wherein the ion-exchange material comprises a hydrotalcite-like compound.
9. The process of claim 3 , wherein the ion-exchange material comprises an organic anion exchange resin bearing tertiary or quaternary amino groups.
10. The process of claim 3 , wherein at least part of the stream contains monopropylene glycol.
11. The process of claim 3 , wherein at least part of the stream contains monoethylene glycol.
12. The process of claim 3 , wherein the halogen-containing compounds are at least in part 1,2-halohydrin compounds.
13. The process of claim 1 , wherein the ion-exchange material comprises a hydrotalcite-like compound.
14. The process of claim 1 , wherein the ion-exchange material comprises an organic anion exchange resin bearing tertiary or quaternary amino groups.
15. The process of claim 1 , wherein at least part of the stream contains monopropylene glycol.
16. The process of claim 1 , wherein at least part of the stream contains monoethylene glycol.