Production of ammonium sulfate using a vacuum absorption process

Patent metadata

Field	Value
Publication number	US-10053369-B2
Application number	US-201715484653-A
Country	US
Kind code	B2
Filing date	Apr 11, 2017
Priority date	Apr 11, 2016
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

The present disclosure is directed to methods for treating an organic material, including the steps of transporting the organic material into a first vessel; heating the organic material in the first vessel and applying a negative pressure to the organic material in the first vessel to a boiling point of the organic material, wherein the heat and negative pressure separates a portion of an ammonia from the organic material; removing the portion of the ammonia from the first vessel; transporting the removed portion of the ammonia from the first vessel to an acid solution in a second vessel; and separating a portion of the ammonia from the acid solution.

First claim

The invention claimed is:

1. A method of treating an organic material, the method comprising:
transporting the organic material into a first vessel;
heating the organic material in the first vessel and applying a negative pressure to the organic material in the first vessel to a boiling point of the organic material, wherein the heat and negative pressure separates a portion of an ammonia from the organic material;
removing the portion of the ammonia from the first vessel;
transporting the removed portion of the ammonia from the first vessel, through a demister, to an acid solution in a second vessel; and
separating a portion of the ammonia from the acid solution.

2. The method of claim 1 , wherein the portion of the ammonia separated from the acid solution is (NH 4 ) 2 SO 4 .

3. The method of claim 2 , wherein the (NH 4 ) 2 SO 4 is in the form of a (NH 4 ) 2 SO 4 crystal.

4. The method of claim 3 , wherein the (NH 4 ) 2 SO 4 crystal is of a purity of between about 94.3% and about 106.8%.

5. The method of claim 1 , wherein the acid solution in the second vessel comprises H 2 SO 4 .

6. The method of claim 5 , wherein the concentration of H 2 SO 4 is between about 2% and about 4% (w/w).

7. The method of claim 1 , wherein a diameter of the demister is about 5% to about 40% of the diameter of the first vessel.

8. The method of claim 1 , wherein a diameter of the demister is about 18% of the diameter of the first vessel.

9. The method of claim 1 , further comprising a step of removing a waste stream from the second vessel.

10. The method of claim 9 , wherein an ammonia concentration in the waste stream is between about 4.2% and about 21.3% of an ammonia concentration of the organic material in the first vessel after about 1.5 hours of treatment.

11. The method of claim 9 , wherein an ammonia concentration in the waste stream is between about 0.1% and about 6.7% of an ammonia concentration of the organic material in the first vessel after about 3 hours of treatment.

12. A method of treating an organic material, the method comprising:
transporting the organic material into a first vessel;
heating the organic material in the first vessel and applying a negative pressure to the organic material in the first vessel to a boiling point of the organic material, wherein the heat and negative pressure separates a portion of an ammonia from the organic material;
removing the portion of the ammonia from the first vessel;
transporting the removed portion of the ammonia from the first vessel to an acid solution in a second vessel;
separating a portion of the ammonia from the acid solution;
removing a waste stream from the second vessel.

13. The method of claim 12 , wherein the portion of the ammonia separated from the acid solution is (NH 4 ) 2 SO 4 .

14. The method of claim 13 , wherein the (NH 4 ) 2 SO 4 is in the form of a (NH 4 ) 2 SO 4 crystal.

15. The method of claim 14 , wherein the (NH 4 ) 2 SO 4 crystal is of a purity of between about 94.3% and about 106.8%.

16. The method of claim 12 , wherein the acid solution in the second vessel comprises H2SO4.

17. The method of claim 16 , wherein the concentration of NH 2 SO 4 is between about 2% and about 4% (w/w).

18. The method of claim 12 , further comprising a step of passing the removed portion of the ammonia from the first vessel through a demister before the portion is transported to the second vessel.

19. The method of claim 18 , wherein a diameter of the demister is about 5% to about 40% of the diameter of the first vessel.

20. The method of claim 18 , wherein a diameter of the demister is about 18% of the diameter of the first vessel.

21. The method of claim 12 , wherein an ammonia concentration in the waste stream is between about 4.2% and about 21.3% of an ammonia concentration of the organic material in the first vessel after about 1.5 hours of treatment.

22. The method of claim 12 , wherein an ammonia concentration in the waste stream is between about 0.1% and about 6.7% of an ammonia concentration of the organic material in the first vessel after about 3 hours of treatment.

Assignees

• Univ New York State Res Found

Inventors

• Tao Wendong
• Ukwuani Anayo Thomas

Classifications

• C02F2101/16

  Nitrogen compounds, e.g. ammonia · CPC title

• C02F2103/20

  from animal husbandry · CPC title

• B01D2252/10

  Inorganic absorbents · CPC title

• C02F1/20

  by degassing, i.e. liberation of dissolved gases (degasification of liquids in general B01D19/00; arrangement of degassing apparatus in boiler feed supply F22D) · CPC title

• C01C1/10 Primary

  Separation of ammonia from ammonia liquors, e.g. gas liquors {(as part of the ammonia synthesis process C01C1/04)} · CPC title