Stable nitric acid blends and uses thereof

Patent metadata

Field	Value
Publication number	US-12065628-B2
Application number	US-202117338361-A
Country	US
Kind code	B2
Filing date	Jun 3, 2021
Priority date	Jun 5, 2020
Publication date	Aug 20, 2024
Grant date	Aug 20, 2024

Abstract

A modified aqueous acid composition comprising: nitric acid; sulfuric acid; a compound comprising an amine moiety and a sulfonic acid moiety; and a peroxide. Also disclosed are methods of using such composition.

First claim

The invention claimed is:

1. A modified aqueous acid composition consisting of:
nitric acid;
sulfuric acid;
a compound having an amine moiety and a sulfonic acid moiety;
a peroxide; and water.

2. The modified aqueous acid composition according to claim 1 , wherein the peroxide and said compound having an amine moiety and a sulfonic acid moiety are present in a molar ratio of no more than 5:1 and no less than 1:3.

3. The composition according to claim 1 , wherein said compound having an amine moiety and a sulfonic acid moiety is selected from the group consisting of: taurine and taurine derivatives.

4. The composition according to claim 1 , wherein said compound having an amine moiety and a sulfonic acid moiety is a taurine derivative and is selected from the group consisting of: taurolidine; taurocholic acid; tauroselcholic acid; tauromustine; 5-taurinomethyluridine and 5-taurinomethyl-2-thiouridine; homotaurine; acamprosate; and taurates.

5. The composition according to claim 1 , wherein said compound having an amine moiety and a sulfonic acid moiety is taurine.

6. The composition according to claim 1 , wherein the peroxide is selected from the group consisting of: hydrogen peroxide; benzoyl peroxide; percarbonates; perborates; persulfates; and combinations thereof.

7. An aqueous composition for use in the removal of calcium oxalate scale, wherein said composition consists of:
nitric acid in an amount ranging from 2 to 10 wt % of the total weight of the composition;
sulfuric acid in an amount ranging from 0.5 to 10 wt % of the total weight of the composition;
a compound having an amine moiety and a sulfonic acid moiety selected from the group consisting of: taurine and taurine derivatives in an amount ranging from 0.2 to 10 wt % of the total weight of the composition;
a peroxide in an amount ranging from 0.5 to 20 wt % of the total weight of the composition; and water.

8. The composition according to claim 7 for use in the removal of calcium oxalate scale,
wherein the total molar ratio of peroxide to nitric acid, sulfuric acid and sulfonic acid moiety ranges from
1:5 to 5:1.

9. The composition according to claim 7 , wherein the total molar ratio of peroxide to nitric acid, sulfuric acid and sulfonic acid moiety ranges from 1:3 to 3:1.

10. The composition according to claim 7 , wherein the total molar ratio of peroxide to nitric acid, sulfuric acid and sulfonic acid moiety ranges from 1:1 to 2:1.

11. The composition according to claim 7 , wherein said compound having an amine moiety and a sulfonic acid moiety is a taurine derivative and is selected from the group consisting of: taurolidine; taurocholic acid; tauroselcholic acid; tauromustine; 5-taurinomethyluridine and 5-taurinomethyl-2-thiouridine; homotaurine; acamprosate; and taurates.

12. The composition according to claim 7 , wherein said compound having an amine moiety and a sulfonic acid moiety is taurine.

13. The composition according to claim 7 , wherein the peroxide is hydrogen peroxide.

14. A peroxide-containing composition consisting of:
nitric acid;
sulfuric acid;
a compound having an amine moiety and a sulfonic acid moiety selected from the group consisting of: taurine and derivatives thereof;
a source of peroxide;
water; and
wherein said peroxide-containing composition has a pH of at least 1 and a peroxide content of at least 75% of the initial peroxide concentration after 45 days.

15. The peroxide-containing composition according to claim 14 , wherein said composition has a pH of at least 1 and a peroxide content of at least 95% after 14 days.

16. The peroxide-containing composition according to claim 14 , wherein said composition has a pH of at least 1 and a peroxide content of at least 90% after 20 days.

Assignees

• Fluid Energy Group Ltd
• Dorf Ketal Chemicals Fze

Inventors

• Purdy Clay
• Weissenberger Markus
• Wynnyk Kyle G

Classifications

• C11D2111/20

  Industrial or commercial equipment, e.g. reactors, tubes or engines · CPC title

• C11D3/3947

  Liquid compositions · CPC title

• C11D3/3902

  combined with specific additives · CPC title

• C11D3/26

  containing nitrogen {(C11D3/162, C11D3/164, C11D3/166, C11D3/168 take precedence)} · CPC title

• C11D1/002

  Surface-active compounds containing sulfur (SO3 and SO4, C11D1/12; sulfonium compounds C11D1/60; sulfoxides C11D1/755; sulfobetaines C11D1/92) · CPC title