Process for removal of sulfides from carbon monoxide rich gas stream at ambient temperatures

Patent metadata

Field	Value
Publication number	US-2021300766-A1
Application number	US-201917259362-A
Country	US
Kind code	A1
Filing date	Jul 17, 2019
Priority date	Jul 17, 2018
Publication date	Sep 30, 2021
Grant date	—

Abstract

Disclosed are methods and systems for desulfurization of CO-rich streams. A method can include contacting a CO-rich gas stream with activated carbon and/or contacting the CO-rich gas stream with a zinc-oxide sorbent material at a temperature of 0 to 50° C. to remove at least a portion of the sulfur-containing compounds present in the stream.

First claim

1 . A method of removing sulfur-containing compounds from a carbon monoxide (CO)-rich gas stream having at least 50 mol % CO, the method comprising:
(a) contacting the CO-rich gas stream with a first sorbent material comprising activated carbon to remove at least a portion of the sulfur-containing compounds present in the stream; and (b) contacting the CO-rich gas stream with a second sorbent material comprising zinc oxide at a temperature of 0 to 50° C. to remove at least a portion of the sulfur-containing compounds present in the stream and produce a de-sulfided gas stream; wherein the second sorbent material has a B.E.T. surface area of greater than 50 m 2 /g, and has an H 2 S sorption capacity of greater than 6 wt % of the second sorbent material weight at 37.8° C. and 0.85 MPa.

2 . The method of claim 1 , wherein the second sorbent comprises the zinc oxide supported on alumina, wherein the second sorbent material has a B.E.T. surface area of greater than 80 m 2 /g, as measured in accordance with ASTM D3663-03.

3 . The method of claim 1 , wherein the selectivity of the sorbent material to H 2 S removal compared with its selectivity to COS formation defined as the ratio of ppm H 2 S to ppm COS at breakthrough of the sorbent is greater than 10.

4 . The method of claim 1 , wherein the CO-rich gas stream has at least 50 mol % CO, and less than 5 mol % hydrogen (H 2 ).

5 . The method of claim 1 , wherein contacting step (b) is performed at a temperature of 0° C. to 50° C, and wherein contacting step (a) is optionally performed at a temperature of 0° C. to 50° C.

6 . The method of claim 1 , wherein contact of the CO-rich gas stream with the second sorbent material of step (b) does not produce COS and/or CS 2 , and optionally wherein the CO-rich stream has a dew point of −40° C. or less.

7 . The method of claim 1 , wherein the zinc oxide in the second sorbent material is a non-carbon supported zinc oxide.

8 . The method of claim 5 , wherein the support comprises alumina (Al 2 O 3 ).

9 . The method of claim 1 , wherein the second sorbent material comprises 10 wt % to 90 wt % zinc oxide.

10 . The method of claim 1 , wherein the second sorbent material is not doped with catalytically active metal.

11 . The method of claim 1 , wherein step (a) is performed prior to step (b).

12 . The method of claim 1 , wherein a metal oxide impregnated activated carbon sorbent material is not used in the method.

13 . The method of claim 1 , wherein the sulfur-containing compounds comprise carbonyl sulfide (COS), carbon disulfide (CS 2 ), and hydrogen sulfide (H 2 S), wherein the first sorbent material removes at least a portion of COS and CS 2 from the CO-rich stream, and wherein the second sorbent material removes at least a portion of H 2 S from the CO-rich stream.

14 . The method of claim 11 , wherein the de-sulfurized CO-rich gas stream has 100 ppmw or less total of H 2 S and COS combined.

15 . The method of claim 1 , wherein the H 2 S sorption capacity is greater than 9 wt % of H 2 S sorbed before breakthrough.

16 . The method of claim 1 , further comprising: reacting chlorine gas with CO in the de-sulfurized CO-rich gas stream to produce phosgene.

17 . The method of claim 1 , wherein the second sorbent comprises the zinc oxide supported on alumina, wherein the second sorbent material has a B.E.T. surface area of greater than 80 m 2 /g, as measured in accordance with ASTM D3663-03.

18 . The method of claim 1 , wherein the de-sulfurized CO-rich gas stream has 25 ppmw or less total of H 2 S and COS combined.

19 . The method of claim 1 , wherein contacting step (b) is performed at a temperature of 15° C. to 50° C., and wherein contacting step (a) is performed at a temperature of 15° C. to 50° C.

20 . A method of removing sulfur-containing compounds from a carbon monoxide (CO)-rich gas stream having at least 50 mol % CO and 10-1000 ppmw H 2 S, the method comprising:
(a) contacting the CO-rich gas stream with a first sorbent material comprising activated carbon to remove at least a portion of the sulfur-containing compounds present in the stream; and (b) contacting the CO-rich gas stream with a second sorbent material comprising zinc oxide and alumina at a temperature of 15 to 50° C. to remove at least a portion of the sulfur-containing compounds present in the stream and produce a de-sulfided gas stream; wherein the second sorbent material has a B.E.T. surface area of greater than 100 m 2 /g, and has an H 2 S sorption capacity of greater than 9 wt % of the second sorbent material weight at 37.8° C. and 0.85 MPa, and wherein the second sorbent material comprises 60 wt % to 70 wt % zinc oxide.

Assignees

• Sabic Global Technologies Bv

Inventors

• Gautam Pankaj Singh
• Liu Zheng
• Gu Tian
• Chakraborty Debashis
• Deshpande Sanjeev

Classifications

• B01D53/82

  with stationary reactants · CPC title

• B01D2257/304

  Hydrogen sulfide · CPC title

• B01D2256/20

  Carbon monoxide · CPC title

• B01D53/52

  Hydrogen sulfide · CPC title

• C10K1/32

  with selectively adsorptive solids, e.g. active carbon · CPC title