Water purification compositions of magnesium oxide and applications thereof

Patent metadata

Field	Value
Publication number	US-9422169-B2
Application number	US-201214235206-A
Country	US
Kind code	B2
Filing date	Sep 26, 2012
Priority date	Sep 26, 2011
Publication date	Aug 23, 2016
Grant date	Aug 23, 2016

Abstract

The present disclosure provides a composition for purifying water comprising a magnesium oxide component and a binder. The magnesium oxide component includes magnesium oxide, a pH regulator, and an additional water purifying material. The binder can be an organic polymer, an inorganic binder, or a combination of both.

First claim

We claim:

1. A granular water purification composition comprising a magnesium oxide component and a binder, wherein the binder comprises one or more aluminum silicates and wherein said one or more aluminum silicates are present in the water purification composition in an amount of about 1% to about 15% by weight.

2. The composition of claim 1 , wherein the magnesium oxide component comprises MgO in an amount of about 40% to about 90% by weight.

3. The composition of claim 2 , wherein the magnesium oxide component further comprises a pH regulator in an amount of about 8% to about 20% by weight.

4. The composition of claim 3 , wherein the pH regulator comprises CaCO 3 .

5. The composition of claim 2 , wherein said magnesium oxide component further comprises about 30% to about 50% by weight of a water purifying material selected from the group consisting of Fe 2 O 3 , TiO 2 , MgAl 2 O 4 , and combinations of two or more of these.

6. The composition of claim 1 , wherein the composition is in the form of granules having a surface area of about 10 m 2 /g to about 200 m 2 /g, and an average diameter of 0.2 to about 1 mm.

7. The composition of claim 1 , wherein the granules have an average diameter of about 0.4 mm to about 0.8 mm.

8. The composition of claim 1 wherein said one or more aluminum silicates comprises sodium, magnesium, and/or barium aluminum silicates.

9. A water purification composition comprising: (a) binder comprising one or more aluminum silicates; and (b) a magnesium oxide component,
wherein the magnesium oxide component comprises: (i) about 40% to about 60% by weight MgO; (ii) about 30% to about 50% by weight Fe 2 O 3 ; (iii) about 1% to about 5% by weight MgAl 2 O 4 ; and (iv) about 8% to about 20% by weight CaCO 3 and wherein said one or more aluminum silicates are present in the water purification composition in an amount of about 1% to about 15% by weight.

10. The composition of claim 9 wherein said one or more aluminum silicates comprises sodium, magnesium, and/or barium aluminum silicates.

11. A granular water purification composition comprising a magnesium oxide component and a binder, wherein the binder comprises calcium aluminum silicate, and wherein the calcium aluminum silicate is present in an amount of about 1% to about 15% by weight.

12. The composition of claim 11 , wherein the magnesium oxide component comprises magnesium oxide in an amount of about 10% to about 40% by weight.

13. The composition of claim 12 , wherein said magnesium oxide component further comprises about 60% to about 70% by weight of a water purifying material selected from the group consisting of Fe 2 O 3 , TiO 2 , MgAl 2 O 4 , and combinations of two or more of these.

14. The composition of claim 11 , wherein the magnesium oxide component further comprises a pH regulator in an amount of about 7% to about 10% by weight.

15. The composition of claim 14 , wherein the pH regulator comprises CaCO 3 .

16. The composition of claim 11 , wherein the composition is in the form of granules having a surface area of about 10 m 2 /g to about 200 m 2 /g, and an average diameter of 0.2 to about 1 mm.

17. The composition of claim 11 , wherein the granules have an average diameter of about 0.4 mm to about 0.8 mm.

18. A water purification composition comprising: (a) calcium aluminum silicate; and (b) a magnesium oxide component,
wherein the calcium aluminum silicate is present in an amount of about 1% to about 15% by weight, and
wherein the magnesium oxide component comprises: (i) about 10% to about 40% by weight MgO; (ii) about 60% to about 70% by weight Fe 2 O 3 ; (iii) about 1% to about 5% by weight MgAl 2 O 4 ; and (iv) about 7% to about 10% by weight CaCO 3 .

19. The composition of claim 18 , wherein the composition is in the form of granules having a surface area of about 10 m 2 /g to about 200 m 2 /g, and an average diameter of 0.2 mm to about 1.0 mm.

20. A granular water purification composition comprising a magnesium oxide component and a binder, wherein the binder is calcium aluminum silicate, which is present in an amount of about 1% to about 10% by weight, and wherein the magnesium oxide component comprises: (a) MgO in an amount of about 20% by weight; (b) Fe 2 O 3 in an amount of about 70% by weight; and (c) CaCO 3 in an amount of about 10% by weight.

21. The composition of claim 20 , wherein the composition is in the form of granules having a surface area of about 10 m 2 /g to about 200 m 2 /g, and an average diameter of about 0.2 mm to about 1 mm.

22. The composition of claim 18 , wherein the calcium aluminum silicate is present in about 2% to about 10% by weight.

Assignees

• Honeywell Int Inc

Inventors

• Raghurama Raju
• Mutukuri Srinivas S N
• Srivastava Abhilasha
• Kumbarageri Reddappa Reddy
• Banavali Rajiv
• Fooken Michael

Classifications

• C02F1/281 Primary

  using inorganic sorbents · CPC title

• B01J20/041

  Oxides or hydroxides · CPC title

• B01J20/28057

  Surface area, e.g. B.E.T specific surface area · CPC title

• B01J20/3028

  Granulating, agglomerating or aggregating · CPC title

• C02F1/288 Primary

  using composite sorbents, e.g. coated, impregnated, multi-layered · CPC title