Synthetic caustic composition

Patent metadata

Field	Value
Publication number	US-11267718-B2
Application number	US-201816189589-A
Country	US
Kind code	B2
Filing date	Nov 13, 2018
Priority date	Nov 15, 2017
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

An aqueous caustic composition comprising: a caustic component; an alkanolamine additive adapted to provide an extended buffering effect to the caustic composition when such is exposed to acid; and water. Uses and methods of using such compositions are also disclosed.

First claim

The invention claimed is:

1. An aqueous caustic composition comprising:
a caustic component present in an amount ranging from 5 wt % to 40 wt %;
an alkanolamine additive present in an amount ranging from 4 wt % to 15 wt %; and
water,
wherein the alkanolamine additive buffers a pH of the aqueous caustic composition between 8.25 and 10,
wherein the alkanolamine additive is selected from the group consisting of monoethanolamine, diethanolamine, triethanolamine, aminomethyl propanol, propanolamine, dimethylethanolamine, N-methylethanolamine, and combinations thereof, and
wherein the caustic component and the alkanolamine additive are present in a molar ratio ranging from 15:1 to 5:1.

2. The aqueous caustic composition according to claim 1 , wherein the caustic component is selected from the group consisting of: potassium hydroxide; sodium hydroxide; lithium hydroxide; cesium hydroxide; rubidium hydroxide; and combinations thereof.

3. The aqueous caustic composition according to claim 1 , wherein the caustic component is selected from the group consisting of: potassium hydroxide; sodium hydroxide; and combinations thereof.

4. The aqueous caustic composition according to claim 1 , wherein the alkanolamine additive is monoethanolamine.

5. The aqueous caustic composition according to claim 1 , wherein the alkanolamine additive is diethanolamine.

6. The aqueous caustic composition according to claim 1 , wherein the alkanolamine additive is triethanolamine.

7. The aqueous caustic composition according to claim 1 , wherein the caustic component is present in a concentration ranging from 10 to 30 wt % of the aqueous caustic composition.

8. The aqueous caustic composition according to claim 1 , wherein the caustic component is present in a concentration ranging from 15 to 25 wt % of the aqueous caustic composition.

9. The aqueous caustic composition according to claim 1 , wherein the caustic component is present in a concentration of approximately 25 wt % of the aqueous caustic composition.

10. The caustic composition according to claim 1 , wherein the alkanolamine additive is present in a concentration ranging from 4 wt % to 10 wt % of the aqueous caustic composition.

11. An aqueous caustic composition consisting essentially of:
a caustic component;
an alkanolamine additive; and
water;
wherein the caustic component is present in a concentration of up to 40 wt % of the composition,
wherein the caustic component and the alkanolamine additive are present in a molar ratio ranging from 15:1 to 5:1, and
wherein the alkanolamine additive buffers a pH of the aqueous caustic composition between 8.25 and 10.

12. An aqueous caustic composition according to claim 11 , wherein the molar ratio ranges from 12:1 to 8:1.

13. An aqueous caustic composition according to claim 11 , wherein the caustic component comprises: a hydroxide anion and a monovalent cation.

14. The aqueous caustic composition according to claim 1 , wherein the aqueous caustic composition has a freezing point of less than about −18° C.

15. The aqueous caustic composition according to claim 1 , wherein the aqueous caustic composition has a freezing point of about −45° C.

16. The aqueous caustic composition according to claim 1 , wherein an amount of the water is at least 45 wt %.

17. The aqueous caustic composition according to claim 9 , wherein an amount of the water is 70 wt %.

18. The aqueous caustic composition according to claim 11 , wherein the alkanolamine additive is selected from the group consisting of monoethanolamine, diethanolamine, triethanolamine, aminomethyl propanol, propanolamine, dimethylethanolamine, N-methylethanolamine, and combinations thereof.

Assignees

• Fluid Energy Group Ltd

Inventors

• Purdy Clay
• Weissenberger Markus

Classifications

• C10G1/04

  by extraction · CPC title

• C09K8/70

  characterised by their form or by the form of their components, e.g. foams · CPC title

• C09K8/86

  containing organic compounds · CPC title

• C09K8/887

  containing cross-linking agents · CPC title

• C10G19/067

  with molten alkaline material · CPC title