Method for the recycling or disposal of halocarbons

Patent metadata

Field	Value
Publication number	US-12116336-B2
Application number	US-201917299764-A
Country	US
Kind code	B2
Filing date	Dec 5, 2019
Priority date	Dec 6, 2018
Publication date	Oct 15, 2024
Grant date	Oct 15, 2024

Abstract

The present invention relates to a method for recycling and/or disposal of halocarbons, particularly fluorinated alkanes, such as trifluoromethane, by reacting said halocarbons with sulfur trioxide, particularly to form halide sulfonic acids and sulfur dioxide.

First claim

The invention claimed is:

1. A method for conversion of fluorinated carbons, comprising steps of reacting a fluorinated carbon with SO 3 , wherein the method is performed in the absence of metal catalysts and the fluorinated carbon has a carbon number in the range of from 1 to 20; characterized in that the fluorinated carbon is reacted with sulfur trioxide to form fluorosulfonic acid.

2. The method according to claim 1 , wherein the SO 3 is present as oleum.

3. The method according to claim 1 , characterized in that the fluorinated carbon is a hydrocarbon in which at least one H-atom is replaced by fluorine, said hydrocarbon being selected from an alkane, an alkene, or an alkyne, wherein said hydrocarbon can be linear, branched or cyclic, substituted or un-substituted.

4. The method according to claim 1 , characterized in that the molecular ratio between sulfur trioxide and fluorinated carbon is in the range of from 1 to 100.

5. The method according to claim 1 , characterized in that the fluorinated carbon is reacted with sulfur trioxide at a temperature of 0 to 200° C.

6. The method according to claim 1 , characterized in that the fluorinated carbon is reacted with sulfur trioxide at a pressure of 1 to 200 bar.

7. The method according to claim 1 , characterized in that the fluorinated carbon comprises a single or multiple fluorine atoms, wherein one or more of the carbon atoms of the fluorinated carbon are bonded to one or more fluorinated atoms.

8. A method for conversion of fluorinated carbons, comprising steps of reacting a fluorinated carbon with SO 3 , wherein the method is performed in the absence of metal catalysts and the fluorinated carbon has a carbon number in the range of from 1 to 20;
wherein the SO 3 is present as oleum;
wherein a peroxide compound is added to the reaction mixture comprising fluorinated carbon and oleum.

9. The method according to claim 8 , wherein the peroxide is added stoichiometrically if the fluorinated carbon comprises more than 1 C-atom, and the peroxide is added sub-stoichiometrically if the fluorinated carbon comprises 1 C-atom.

10. The method according to claim 1 , wherein one or more of methylene bis(fluorosulfate), fluoromethyl fluorosulfate, or methylene disulfate occur during the reaction.

11. The method according to claim 10 , wherein the one or more of methylene bis(fluorosulfate) or fluoromethyl fluorosulfate is separated from the reaction mixture.

12. The method of claim 1 , further comprising recycling or disposing of a reaction product of the conversion of fluorinated carbons.

13. The method of claim 12 , characterized in that the fluorinated carbon is a fluoroalkane.

14. The method according to claim 5 , characterized in that the fluorinated carbon is reacted with sulfur trioxide at a pressure of 1 to 200 bar.

15. The method according to claim 8 , characterized in that the fluorinated carbon is reacted with sulfur trioxide to form fluorosulfonic acid.

16. The method according to claim 5 , characterized in that the fluorinated carbon is reacted with sulfur trioxide at a temperature of 80° C. to 125° C.

17. A method for conversion of fluorinated carbons, comprising steps of reacting a fluorinated carbon with SO 3 , wherein the method is performed in the absence of metal catalysts and the fluorinated carbon has a carbon number in the range of from 1 to 20; wherein the fluorinated carbon is a CF 3 H.

18. The method according to claim 17 , characterized in that the molecular ratio between sulfur trioxide and fluorinated carbon is in the range of from 1 to 100.

19. The method according to claim 17 , characterized in that the fluorinated carbon is reacted with sulfur trioxide at a temperature of 0 to 200° C.

20. The method according to claim 17 , characterized in that the fluorinated carbon is reacted with sulfur trioxide at a pressure of 1 to 200 bar.

Assignees

• Grillo Werke Ag
• Lts Lohmann Therapie Systeme Ag

Inventors

• Ott Timo
• Diaz-Urrutia Christian
• Vogt Matthias

Classifications

• Y02C20/30

  of perfluorocarbons [PFC], hydrofluorocarbons [HFC] or sulfur hexafluoride [SF6] · CPC title

• C07C303/06 Primary

  by reaction with sulfuric acid or sulfur trioxide · CPC title