Process for producing salt from waste aqueous streams of organic peroxides production

Patent metadata

Field	Value
Publication number	US-12297118-B2
Application number	US-202017310327-A
Country	US
Kind code	B2
Filing date	Jan 28, 2020
Priority date	Jan 31, 2019
Publication date	May 13, 2025
Grant date	May 13, 2025

Abstract

Process for producing a salt comprising NaCl and/or KCl from the aqueous effluents from one or more organic peroxide production processes, said process comprising the following steps (a) ensuring the pH of the aqueous effluents to be in the range from about 1-5, (b) separating the effluents in a liquid organic layer and an aqueous layer, (c) removing the organic layer, (d) raising the pH of the aqueous layer to a value in the range from about 6-14, and (e) crystallizing the salt from the aqueous layer having a pH in the range from about 6-14.

First claim

What is claimed is:

1. Process for producing a salt comprising NaCl and/or KCl from aqueous effluents from one or more organic peroxide production processes, said process comprising the following steps:
a) ensuring the pH of the aqueous effluents to be from about 1-about 5,
b) separating the effluents in a liquid organic layer and an aqueous layer,
c) removing the organic layer,
d) raising the pH of the aqueous layer to a value from about 6-about 14,
e) crystallizing the salt from the aqueous layer having a pH from about 6-about 14,
wherein step c) comprises using an oil skimmer.

2. Process according to claim 1 wherein step a) comprises acidification of the effluents to a pH from about 1-about 4.

3. Process according to claim 2 wherein HCl is used for the acidification.

4. Process according to claim 1 wherein, prior to step d), the aqueous layer is subjected to steam stripping to remove volatile organic compounds.

5. Process according to claim 4 wherein the volatile organic compounds comprise isobutyric acid, n-butyric acid, pivalic acid, tert-amyl hydroperoxide, and/or tert-butyl hydroperoxide.

6. Process according claim 1 wherein an organic solvent is added before or during step b).

7. Process according to claim 6 wherein the organic layer collected in step c) is recycled and reused as the organic solvent.

8. Process according to claim 1 wherein step e) comprises subjecting the aqueous phase to evaporation, thereby crystallizing the salt to form a salt slurry.

9. Process according to claim 1 wherein the salt obtained in step e) is dried to a moisture content below about 0.5 wt %.

10. Process according to claim 6 wherein the organic layer collected in step c) is recycled and reused as the organic solvent after being washed with an alkaline aqueous solution.

11. Process according to claim 2 wherein, prior to step d), the aqueous layer is subjected to steam stripping to remove volatile organic compounds.

12. Process according to claim 3 wherein, prior to step d), the aqueous layer is subjected to steam stripping to remove volatile organic compounds.

13. Process according claim 2 wherein an organic solvent is added before or during step b).

14. Process according to claim 13 wherein the organic layer collected in step c) is recycled and reused as the organic solvent after being washed with an alkaline aqueous solution.

15. Process according claim 3 wherein an organic solvent is added before or during step b).

16. Process according to claim 15 wherein the organic layer collected in step c) is recycled and reused as the organic solvent after being washed with an alkaline aqueous solution.

17. Process according claim 4 wherein an organic solvent is added before or during step b).

18. Process according to claim 17 wherein the organic layer collected in step c) is recycled and reused as the organic solvent after being washed with an alkaline aqueous solution.

19. Process according claim 5 wherein an organic solvent is added before or during step b) and wherein the organic layer collected in step c) is recycled and reused as the organic solvent after being washed with an alkaline aqueous solution.

20. Process according to claim 1 wherein:
step a) comprises acidification of the effluents to a pH from about 1-about 4 using HCl;
an organic solvent is added before or during step b); and
the organic layer collected in step c) is recycled and reused as the organic solvent.

Assignees

• Nouryon Chemicals Int Bv

Inventors

• Steensma Maria
• Tammer Martinus Catharinus
• Decker Claus

Classifications

• C01P2006/82

  water content · CPC title

• B01D2257/708

  Volatile organic compounds V.O.C.'s · CPC title

• B01D11/0492

  Applications, solvents used · CPC title

• B01D3/38

  Steam distillation · CPC title

• B01D17/047

  with separation aids · CPC title