Method and composition for removing sulfides from hydrocarbon streams
View Patent ↗A method and composition for reducing the levels of hydrogen sulphide and mercaptans in hydrocarbon streams. The method comprises contacting the gas stream with a composition comprising the reaction product of mixing monoethanolamine, diglycolamine and formaldehyde. The use of the method and composition alleviates problems associated with crystalline dithiazine depost build-up associated with the use of triazine based scavengers.
1. A method for reducing the levels of hydrogen sulphide and mercaptans in hydrocarbon streams comprising contacting said streams with a composition comprising the reaction product of mixing monoethanolamine, diglycolamine and formaldehyde.
2. The method according to claim 1 wherein the molar ratio of monoethanolamine and diglycolamine to formaldehyde is from about 3:1 to about 1:3.
3. The method according to claim 1 wherein the molar ratio of monoethanolamine and diglycolamine to formaldehyde is from about 1:1 to about 1:3.
4. The method according to claim 1 where in the weight ratio of monoethanolamine to diglycolamine is from about 80:20 to about 95:5.
5. The method according to claim 1 wherein the weight ratio of monoethanolamine to diglycolamine is about 90:10.
6. The method according to claim 1 wherein the molar ratio of monoethanolamine and diglycolamine to formaldehyde is from about 3:1 to about 1:3 and the weight ratio of monoethanolamine to diglycolamine is from about 80:20 to about 95:5.
7. The method according to claim 1 wherein the molar ratio of monoethanolamine and diglycolamine to formaldehyde is about 1:1.5 and the weight ratio of monoethanolamine to diglycolamine is about 90:10.
8. A method for reducing the levels of hydrogen sulphide and mercaptans in hydrocarbon streams comprising contacting said streams with a composition comprising 1,3,5 tri-(2-hydroxyethyl)-hexahydro-S-triazine and 1,3,5(2H, 4H, 6H)-tri(2-ethoxyethanol)-1,3,5-triazine.
9. The method according to claim 6 wherein the hydrocarbon stream is a gaseous stream.
10. The method according to claim 9 wherein the gaseous stream is a sour natural gas stream.
11. The method according to claim 10 wherein the level of hydrogen sulphide is reduced to a level of about 16 ppm or less.
12. The method according to claim 6 wherein said step of contacting reacts said reaction production with hydrogen sulphide to form a spent composition comprising dithiazine solids in amorphous form.