Method of treating sour gas and liquid hydrocarbon

• US 5,744,024 A
• Filed: 10/12/1995
• Issued: 04/28/1998
• Est. Priority Date: 10/12/1995
• Status: Expired due to Term

• Current Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Original Assignee: Nalco/Exxon Energy Chemicals L.P. (Exxon Mobil Corporation)
• Inventors: Garcia, Juan M. III, Sullivan, Daniel S. III, Thomas, Allan R., Yon-Hin, Paul
• Primary Examiner(s): GRIFFIN, WALTER DEAN
• Application Number:
  US08/542,462
• Time in Patent Office: 929 Days
• Field of Search: 208/206, 208/207, 208/236, 208/237, 423/242.2, 423/242.6
• US Class Current: 208/236
• CPC Class Codes: B01D 2257/304 Hydrogen sulfide
• CPC Class Codes: B01D 53/1493 Selection of liquid materials for use as absorbents
• CPC Class Codes: C07D 251/04 having no double bonds between ring members or between ring members and non-ring members
• CPC Class Codes: C10G 29/20 Organic compounds not containing metal atoms

Abstract

Reaction of 1,3,5-tri-substituted-hexahydro-1,3,5-triazine is accelerated in H₂ S scavenging by the addition of quaternary ammonium compound. The preferred hexahydro triazines are 1,3,5-tri-methyl-hexahydro-1,3,5-triazines and 1,3,5-tri-methoxypropyl-hexahydro-1,3,5-triazines. The blend of the hexahydro triazine and quaternary ammonium compounds can be used to treat sour gases and liquids (e.g. sour kerosene, crude oil, fuel oils, heating oils, distillate fuels, bunker fuel oil, and the like.

Claims

1. A method of reducing H₂ S in a hydrocarbon fluid which comprises contacting the fluid with an effective amount of a scavenging composition, comprising an aqueous solution of

(a) a 1,3,5-trimethyl-hexahydro-1,3,5 triazine H₂ S scavenger;

and

(b) a quaternary ammonium compound having the following formula;

##STR5## where R₁ and R₂ are independently alkyl groups or hydroxyalkyl groups having from 1 to 4 carbon atoms

R₃ is a benzyl group, and

R₄ is an alkyl or aryl group having from 7 to 20 carbon atoms, and

X^- is an anion selected from the group consisting of chloride and methyl sulfate;

wherein the amount of the quaternary ammonium compound is sufficient to accelerate the H₂ S scavenging action of the 1,3,5-trimethyl-hexahydro-1,3,5 triazine in comparison with the scavenging action of said triazine without the quaternary ammonium compound.

2. The method of claim 1 wherein the weight ratio of (a):

(b) ranges from 10;

0.1 to 1;

1.

3. The method of claim 1 wherein R₄ is a tallow or coco group.

4. The method of claim 1 wherein the hydrocarbon fluid is a hydrocarbon liquid.

5. The method of claim 4 wherein the hydrocarbon liquid is an oil selected from kerosene, crude oil, fuel oils, heating oils, distillate fuels, and bunker fuel oil.

6. A method of reducing H₂ S in a hydrocarbon fluid comprising introducing into the fluid from 50 to 3,000 ppm by volume of a scavenging composition comprising (a) a 1,3,5-trimethylhexahydro-1,3,5-triazine, and (b) a water soluble quaternary ammonium compound which accelerates the scavenging effect of the triazine scavenger, the weight ratio of (a):

(b) in the scavenging composition being between 10;

0.1 to 1;

1.

7. The method of claim 6 wherein components (a) and (b) are introduced into the fluid in a weight ratio ranging from 10:

0.5 to 10;

1.

8. The method of claim 6 wherein the hexahydro triazine and the quaternary ammonium compound are introduced into the fluid as an aqueous solution.

9. The method of claim 6 wherein the quaternary ammonium compound is benzyl cocalkyl dimethyl quaternary ammonium chloride.