Method of scavenging hydrogen sulfide and mercaptans using well treatment composites

1. A method for scavenging hydrogen sulfide and/or mercaptans from a liquid or gaseous stream which comprises bringing the stream into contact with a composite of a liquid hydrogen sulfide scavenger adsorbed onto a water-insoluble adsorbent selected from the group consisting of diatomaceous earth, ground walnut shells or a mixture thereof and scavenging hydrogen sulfide and/or mercaptan from the liquid or gaseous stream by continuously releasing the hydrogen sulfide scavenger from the composite, said hydrogen sulfide scavenger being selected from the group consisting of alkylenepolyamines, quaternary ammonium hydroxides, quaternary ammonium alkoxides, maleimides, formaldehydes, amines, carboxamides, alkylcarboxyl-azo compounds, cumine-peroxide, diazo compounds, azodicarboxylates, bisoxazolidines, morpholino derivatives, triazine derivatives and epoxides.

2. The method of claim 1 , wherein the liquid or gaseous stream is within a hydrocarbon producing reservoir or a storage vessel.

3. The method of claim 1 , wherein the liquid or gaseous stream is an unrefined or refined hydrocarbon product derived from petroleum or from the liquefaction of coal.

4. The method of claim 1 , wherein the liquid or gaseous stream is a wet or dry gaseous mixture or hydrocarbon vapors.

5. The method of claim 1 , wherein the surface area of the adsorbent is between from about 1 m 2 /g to about 100 m 2 /g.

6. The method of claim 1 , wherein the hydrogen sulfide scavenger is continuously released from the composite for a minimum of three months.

7. The method of claim 1 , wherein the amount of hydrogen sulfide scavenger in the composite is between from about 0.05 to about 5 weight percent.

8. A method for scavenging hydrogen sulfide and/or mercaptans from a liquid or gaseous stream which comprises bringing the stream into contact with a composite of a liquid hydrogen sulfide scavenger adsorbed onto a water-insoluble adsorbent, wherein the weight ratio of the hydrogen sulfide scavenger to adsorbent in the composite is between from about 90:10 to about 10:90, and scavenging hydrogen sulfide and/or mercaptan from the liquid or gaseous stream by continuously releasing the hydrogen sulfide scavenger from the composite, said hydrogen sulfide scavenger being selected from the group consisting of alkylenepolyamines, quaternary ammonium hydroxides, quaternary ammonium alkoxides, maleimides, formaldehydes, amines, carboxamides, alkylcarboxyl-azo compounds, cumine-peroxide, diazo compounds, azodicarboxylates, bisoxazolidines, morpholino derivatives, triazine derivatives and epoxides.

9. The method of claim 8 , wherein the liquid or gaseous stream is within a hydrocarbon producing reservoir or a storage vessel.

10. The method of claim 8 , wherein the liquid or gaseous stream is an unrefined or refined hydrocarbon product derived from petroleum or from the liquefaction of coal or is a wet or dry gaseous mixture or hydrocarbon vapors.

11. The method of claim 8 , wherein the surface area of the adsorbent is between from about 1 m 2 /g to about 100 m 2 /g.

12. The method of claim 8 , wherein the hydrogen sulfide scavenger is continuously released from the composite for a minimum of three months.

13. The method of claim 8 , wherein the water-insoluble adsorbent is selected from the group consisting of activated carbon, silica particulate, precipitated silica, zeolite, diatomaceous earth, ground walnut shells and fuller's earth.

14. A method for scavenging hydrogen sulfide and/or mercaptans from a liquid or gaseous stream which comprises bringing the stream into contact with a composite of a liquid hydrogen sulfide scavenger adsorbed onto a water-insoluble adsorbent and scavenging hydrogen sulfide and/or mercaptan from the liquid or gaseous stream by continuously releasing the hydrogen sulfide scavenger from the composite, said hydrogen sulfide scavenger being a triazine.

15. The method of claim 14 , wherein the hydrogen sulfide scavenger is continuously released from the composite for a minimum of three months.

16. The method of claim 14 , wherein the liquid or gaseous stream is within a hydrocarbon producing reservoir or a storage vessel.

17. The method of claim 14 , wherein the amount of hydrogen sulfide scavenger in the composite is between from about 0.05 to about 5 weight percent.

18. The method of claim 14 , wherein the water-insoluble adsorbent is selected from the group consisting of activated carbon, silica particulate, precipitated silica, zeolite, diatomaceous earth, ground walnut shells and fuller's earth.

19. The method of claim 18 , wherein the water-insoluble adsorbent is diatomaceous earth or ground walnut shells.