Process for removal of mercury vapor and adsorbent therefor

• US 4,500,327 A
• Filed: 06/28/1983
• Issued: 02/19/1985
• Est. Priority Date: 07/08/1982
• Status: Expired due to Term

• Current Assignee: Takeda Chemical Industries, Ltd. (Takeda Pharmaceutical Company Limited)
• Original Assignee: Takeda Chemical Industries, Ltd. (Takeda Pharmaceutical Company Limited)
• Inventors: Nishino, Hiroshi, Noguchi, Katsuya, Aibe, Toshio
• Primary Examiner(s): SPITZER, ROBERT H
• Application Number:
  US06/509,232
• Time in Patent Office: 602 Days
• Field of Search: 55/72, 55/74, 55/387
• US Class Current: 95/134
• CPC Class Codes: B01D 53/02 by adsorption, e.g. preparative gas chromatography solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01
• CPC Class Codes: B01D 53/64 Heavy metals or compounds thereof, e.g. mercury
• CPC Class Codes: B01J 20/20 comprising free carbon; comprising carbon obtained by carbonising processes

Abstract

Mercury vapor in a gas can easily be removed from the gas by contacting the gas with an adsorbent comprising an activated carbon having as supported thereon (1) one or more components included in one of three groups shown below and (2) one or more components included in the remaining two groups shown below.

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Group Component ______________________________________ I sulfur II sulfate and nitrate of Al, V, Fe, Co, Ni, Cu, Zn or NH₄ III oxide of iodine, oxyacid correspond- ing to the oxide of iodine, salt of said oxyacid, and bromide and iodide of K, Na or NH₄ ______________________________________

Claims

1. A process for the removal of mercury vapor from a gas containing the same, which comprises contacting the gas with an adsorbent comprising an activated carbon having as supported thereon ( 1) one or more components included in one of the three groups shown below and (2) one or more components included in the remaining two groups shown below:

space="preserve" listing-type="tabular">______________________________________ Group Component ______________________________________ I sulfur II sulfate and nitrate of Al, V, Fe, Co, Ni, Cu, Zn or NH.sub.4 III oxide of iodine, oxyacid correspond- ing to the oxide of iodine, salt of said oxyacid, and bromide and iodide of K, Na or NH.sub.4 ______________________________________

2. A process as claimed in claim 1, wherein the one or more components included in one of the three groups is sulfur included in Group I, and the one or more components included in the remaining two groups are one or more components included in Group II.

3. A process as claimed in claim 1, wherein the one or more components included in one of the three groups is sulfur included in Group I, and the one or more components included in the remaining two groups are one or more components included in Group III.

4. A process as claimed in claim 1, wherein the one or more components included in the remaining two groups are one or more components included in one of the remaining two groups and one or more components included in the other of the remaining two groups.

5. A process as claimed in claim 1, wherein each of the components is supported on the activated carbon so that the amount of sulfur, when used, is in the range of from 10 to 800 mg per g of activated carbon, the total amount of the components included in Group II, when used, is in the range of from 5 to 500 mg per g of activated carbon, and the total amount of the components included in Group III, when used, is in the range of from 1 to 500 mg per g of activated carbon.

6. A process as claimed in claim 1, wherein the activated carbon is one having as supported thereon sulfur and potassium iodide.

7. A process as claimed in claim 1, wherein the activated carbon is one having as supported thereon sulfur and ferrous sulfate.

8. A process as claimed in claim 1, wherein the activated carbon is one having as supported thereon sulfur, potassium idoide and ferrous sulfate.

9. An adsorbent for the removal of mercury vapor, which comprises an activated carbon having as supported thereon (1) one or more components included in one of the three groups shown below and (2) one or more components included in the remaining two groups shown below:

space="preserve" listing-type="tabular">______________________________________ Group Component ______________________________________ I sulfur II sulfate and nitrate of Al, V, Fe, Co, Ni, Cu, Zn or NH.sub.4 III oxide of iodine, oxyacid correspond- ing to the oxide of iodine, salt of said oxyacid, and bromide and iodide of K, Na or NH.sub.4 ______________________________________

10. An adsorbent as claimed in claim 9, wherein the one or more components included in one of the three groups is sulfur included in Group I, and the one or more components included in the remaining two groups are one or more components included in Group II.

11. An adsorbent as claimed in claim 9, wherein the one or more components included in one of the three groups is sulfur included in Group I, and the one or more components included in the remaining two groups are one or more components included in Group III.

12. An adsorbent as claimed in claim 9, wherein the one or more components included in the remaining two groups are one or more components included in one of the remaining two groups and one or more components included in the other of the remaining two groups.

13. An adsorbent as claimed in claim 9, wherein each of the components is supported on the activated carbon so that the amount of sulfur, when used, is in the range of from 10 to 800 mg per g of activated carbon, the total amount of the components included in Group II, when used, is in the range of from 5 to 500 mg per g of activated carbon, and the total amount of the components included in Group III, when used, is in the range of from 1 to 500 mg per g of activated carbon.

14. An adsorbent as claimed in claim 9, wherein the activated carbon is one having as supported thereon sulfur and potassium iodide.

15. An adsorbent as claimed in claim 9, wherein the activated carbon is one having as supported thereon sulfur and ferrous sulfate.

16. An adsorbent as claimed in claim 9, wherein the activated carbon is one having as supported thereon sulfur, potassium iodide and ferrous sulfate.

17. A process for producing an activated carbon having sulfur as supported thereon, which comprises mixing activated carbon with finely powdered sulfur and heating the resultant mixture at 110°

to 350°

C. for not less than 30 minutes.

18. A process as claimed in claim 17, wherein the resultant mixture is heated at 110°

to 300°

C.