Hybrid solvent formulations for total organic sulfur removal and total acidic gas removal

Patent metadata

Field	Value
Publication number	US-10293299-B2
Application number	US-201415032868-A
Country	US
Kind code	B2
Filing date	Oct 24, 2014
Priority date	Oct 30, 2013
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

A method of treating oil and gas streams to remove total organic sulfur or total acid gas including the step of treating the gas stream with a solution of an amine, physical solvent, and water wherein the amine solution may optionally also contain an activator.

First claim

The claimed invention is:

1. A method of treating oil and gas streams to remove total organic sulfur and total acidic gases, said method comprising:
treating said oil and gas streams with an aqueous solution, said aqueous solution comprising:
an amine selected from the group consisting of 3-dimethylamino-1, 2-propanediol, 3-diethylaminopropane-1,2-diol, 2-hydroxymethyl-2-dimethylaminopropane-1,3-diol, 2-hydroxymethyl-2-diethylaminopropane-1,3-diol, dimethylethanolamine, 2-hydroxymethyl-2-methylaminopropane-1,3-diol, 2-hydroxymethyl-2-ethylaminopropane-1,3-diol; and mixtures thereof;
a physical solvent, wherein said physical solvent is a monohydric glycol ether having the formula:

wherein R is a Methyl group, Ethyl group, Propyl group, or Butyl group, and n=1-5; and
an activator.

2. The method of claim 1 , wherein said activator is selected from the group consisting of piperazine, hydroxyethylpiperazine, diethanolamine, N-methylaminoethanol, 2-methylpiperazine, N-methylpiperazine, 2-methyl-2-aminopropanol, or monoethanolamine.

3. The method of claim 1 , wherein said physical solvent is present at a concentration from about 5 wt % to 60 wt %.

4. The method of claim 1 , wherein said aqueous solution additionally comprises an acid, wherein said acid is selected from the group consisting of phosphoric acid, boric acid, sulfuric acid, and mixtures thereof.

5. The method of claim 1 , wherein an equal mass ratio mixture of the amine and physical solvent displays a dielectric constant of less than 20 at 25° C.; and
wherein the pKa of said amine is at least 9.0 at 25° C.

6. The method of claim 1 , wherein said amine has a pKa of 9.0 to 11 at 25° C. and a normal boiling point of at least 200° C.

7. The method of claim 1 , wherein the dielectric constant of said aqueous solution ranges from 5 to 20 at 25° C.

8. The method of claim 1 , wherein said physical solvent is selected from the group consisting of methoxytriglycol, methoxydiglycol, ethoxytriglycol, butoxytriglycol, methyl capped poly-ethylene glycol ethers, methyl capped poly-propylene glycol, and mixtures thereof.

Assignees

• Dow Global Technologies Llc

Inventors

• Laroche Christophe R
• Padilla Gerardo
• Dowdle John R

Classifications

• B01D2252/103

  Water · CPC title

• B01D53/1487

  Removing organic compounds · CPC title

• B01D2252/504

  Mixtures of two or more absorbents · CPC title

• B01D53/1493 Primary

  Selection of liquid materials for use as absorbents · CPC title

• B01D2252/20426

  Secondary amines · CPC title