Process for the treatment of liquefied hydrocarbon gas using 3-(amino) propane-1,2-diol compounds

Patent metadata

Field	Value
Publication number	US-9732298-B2
Application number	US-201314399783-A
Country	US
Kind code	B2
Filing date	Jun 11, 2013
Priority date	Jun 15, 2012
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

A method for treating liquefied hydrocarbons including acid gases to remove said acid gases while minimizing loss of amine species, said method comprising the steps of contacting the liquefied hydrocarbons with an absorbent aqueous solution of a first amine compound, the first amine compound having the structure:

wherein R 1 is propane-2,3-diol; R 2 is hydrogen, methyl ethyl, 2-hydroxyethyl, or propane-2,3-diol; and R 3 is hydrogen, methyl, ethyl, 2-hydroxyethyl or propane-2,3-diol.

First claim

The claimed invention is:

1. A method for treating liquefied hydrocarbons comprising acid gases to remove said acid gases while minimizing loss of amine species, said method comprising the step of contacting said liquefied hydrocarbons with an absorbent aqueous solution of a first amine compound, said first amine compound having the structure:

wherein R 1 is propane-2,3-diol; R 2 is hydrogen, methyl, ethyl, 2-hydroxyethyl, or propane-2,3-diol; and R 3 is hydrogen, methyl, ethyl, 2-hydroxyethyl or propane-2,3-diol.

2. The method of claim 1 , wherein said absorbent aqueous solution comprises from about 0.1 wt. % to 90 wt. % of said first amine compound and additionally comprising from about 1 wt. % to 90 wt. % of a second amine compound.

3. The method of claim 1 , wherein said absorbent aqueous solution comprises from about 0.1 wt. % to 50 wt. % of said first amine compound and additionally comprising from about 5 wt. % to 50 wt. % of a second amine compound.

4. The method of claim 1 , wherein R 1 is propane-2,3-diol; R 2 is 2-hydroxyethyl and R 3 is methyl.

5. The method of claim 1 , wherein R 1 and R 2 are propane-2,3-diol and R 3 is methyl.

6. The method of claim 1 , wherein said acid gases comprise one or more gas selected from the group consisting of CO 2 , H 2 S, a mercaptan compound, COS, CS 2 , and mixtures thereof.

7. The method of claim 1 , wherein said aqueous solution comprises a second amine compound comprising a piperazine compound selected from the group consisting of piperazine, 2-methylpiperazine, 1-hydroxyethylpiperazine, 3-(piperazin-1-yl)propane-1,2-diol, 3,3′-(piperazin-1,4-diyl)bis(propane-1,2-diol) and mixtures thereof.

8. The method of claim 1 , wherein said absorbent aqueous solution comprises a second amine compound selected from the group consisting of triethanolamine, diethanolamine, methyldiethanloamine, diisopropanolamine, 2-amino-2-(hydroxymethyl)propane-1,3-diol, 2-methylamino-2(hydroxymethyl) propane-1,3-diol, 2-dimethylalmino-2-(hydroxymethyl)propane-1,3-diol and mixtures thereof.

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

Assignees

• Dow Global Technologies Llc

Inventors

• Laroche Christophe R
• Hill James M

Classifications

• C10L3/12 Primary

  Liquefied petroleum gas {(liquefying by pressure and cold treatment F25J)} · CPC title

• C10L3/102

  of acid contaminants · CPC title

• C10G21/20 Primary

  Nitrogen-containing compounds · CPC title

• C10L3/103

  Sulfur containing contaminants · CPC title

• C10G29/20

  Organic compounds not containing metal atoms · CPC title