Method for flue gas desulfurization with molten carbonate

Patent metadata

Field	Value
Publication number	US-2019321776-A1
Application number	US-201716311174-A
Country	US
Kind code	A1
Filing date	Jun 19, 2017
Priority date	Jun 19, 2016
Publication date	Oct 24, 2019
Grant date	—

Abstract

This invention is directed to a method used to remove gases from industrial exhaust streams, and in particular, to a method for removing sulfur dioxide from flue gases, with molten carbonate and treating the resulting molten mixture with a natural gas and optionally with an oxidant

First claim

What is claimed is:

1 . A method for removing sulfur dioxide from flue gas, said method comprises:
providing a flue gas comprising a sulfur dioxide; absorbing said sulfur dioxide with molten carbonate forming a molten mixture of carbonates sulfites and sulfates at a temperature of between 400° C. to 600° C.; treating said molten mixture with a natural gas and optionally with an oxidant, by passing said natural gas through said molten mixture, thereby producing a sulfur containing vapor; cooling said sulfur containing vapor and collecting it.

2 . The method of claim 1 , wherein said step of forming molten mixture of carbonates comprises: melting eutectic mixture of Li, Na, K or combination thereof with said flue gas.

3 . The method of claim 1 , wherein said oxidant is O 2 , air, oxygen enriched air.

4 . The method of claim 1 , wherein said sulfur containing vapor is H 2 S, SO 2 , SO 3 .

5 . The method of claim 3 , wherein said sulfur containing vapor is further converted to solid or liquid sulfur containing material for further use.

6 . The method of claim 1 , wherein said treating said molten mixture with a natural gas comprises; heating said molten to a temperature of between 400° C., to 1000° C.

7 . The method of claim 1 , wherein said natural gas comprises methane, ethane, propane, butane, pentane, acetylene, nitrogen or combination thereof.

8 . The method of claim 1 , wherein said molten mixture of carbonates, sulfites and sulfates is treated with natural gas and optionally with an oxidant simultaneously.

9 . The method of claim 1 , wherein said molten mixture of carbonates, sulfites and sulfates is treated with said natural gas first followed by the treatment of said oxidant.

10 . The method of claim 1 , wherein 0.01-0.5 m 3 of natural gas per 1 kg of sulfates or sulfites are passed through the molten mixture.

11 . The method of claim 1 , wherein said absorbing step is conducted by stirring under flow of bubbling gas.

12 . The method of claim 1 , wherein said absorbing step and treating step are conducted in two different zones; wherein said first zone comprises a scrubbing chamber for the absorbing step and said second zone comprises a regeneration chamber for the treating step and said zones are connected via hydraulic communication.

13 . The method of claim 12 wherein the scrubbing chamber being configured for scrubbing the flue gas by absorbing the sulfur dioxide in a pool to form a molten mixture of carbonates, sulfites and sulfates in the pool.

14 . The method of claim 12 , wherein the regeneration chamber being configured for producing a sulfur-containing vapor; and comprising a sulfur-containing vapor outlet port configured for controllable release of the sulfur-containing vapor obtained therein.

15 . The method of claim 13 , wherein said scrubbing chamber comprises a plurality of baffles arranged within said scrubbing chamber and configured to provide a flow of said flue gas within the scrubbing zone.

16 . The method of claim 1 , wherein said absorbing step and treating step are conducted in one zone; wherein said one zone acts as a scrubbing chamber for the absorbing step and as a regeneration chamber for the treating step.

17 . The method of claim 16 wherein the scrubbing chamber being configured for scrubbing the flue gas by absorbing the sulfur dioxide in a pool to form a molten mixture of carbonates, sulfites and sulfates in the pool.

18 . The method of claim 16 , wherein the regeneration chamber being configured for producing a sulfur-containing vapor; and comprising a sulfur-containing vapor outlet port configured for controllable release of the sulfur-containing vapor obtained therein.

19 . The method of claim 16 , wherein said scrubbing chamber comprises a plurality of baffles arranged within said scrubbing chamber and configured to provide a flow of said flue gas within the scrubbing zone.

Assignees

• Yeda Res & Dev

Inventors

• Lubomirsky Igor
• Kaplan Valery
• Dosmukhamedov Nurlan

Classifications

• B01D2251/208

  Hydrocarbons · CPC title

• B01D2251/102

  Oxygen · CPC title

• B01D53/96

  Regeneration, reactivation or recycling of reactants · CPC title

• B01D53/78

  with gas-liquid contact · CPC title

• B01D2257/302

  Sulfur oxides · CPC title