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

Patent metadata

Field	Value
Publication number	US-9708557-B2
Application number	US-201314399814-A
Country	US
Kind code	B2
Filing date	Jun 11, 2013
Priority date	Jun 15, 2012
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

A method for treating liquefied hydrocarbons comprising acid gases to remove said gases while minimizing loss of amine species, the method comprising the step 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 and R 2 may each individually be hydrogen, methyl, ethyl, n-propyl, i-propyl, n-butyl, s-butyl, 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:
contacting said liquefied hydrocarbons with an absorbent aqueous solution of a first amine compound, said first amine compound having the structure:

wherein R 1 and R 2 may each individually be hydrogen, methyl, ethyl, n-propyl, i-propyl, n-butyl, s-butyl, 2-hydroxyethyl, propane-2,3-diol, and mixtures thereof, and wherein said absorbent aqueous solution absorbs said acid gases from said liquefied hydrocarbons;
stripping said acid gases from said absorbent aqueous solution, forming a regenerated absorbent aqueous solution; and
repeating said contacting step with said regenerated absorbent aqueous solution.

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

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

4. The method of claim 1 , wherein R 1 and R 2 are hydrogen.

5. The method of claim 1 , wherein R 1 and R 2 are methyl.

6. The method of claim 1 , wherein R 1 is hydrogen and R 2 is methyl.

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

8. 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.

9. The method of claim 1 , wherein said absorbent aqueous solution comprises a second amine compound comprising compound selected from the group consisting of triethanolamine, diethanolamine, methyldiethanolamine, diisopropanolamine, 3-(2-(hydroxyethyl)methylamino)propane-1,2-diol), 3-(methylamino)bis(propane-1,2-diol), amino-tris(propane-1,2-diol, 3-(methylamino)propane-1,2-diol, 3-(amino)propane-1,2-diol, 3-(amino)bis(propane-1,2-diol) and mixtures thereof.

10. The method of claim 1 , wherein said absorbent aqueous solution 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

• C10G21/20 Primary

  Nitrogen-containing compounds · CPC title

• C10L3/12 Primary

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

• C10L3/104

  Carbon dioxide · CPC title

• C10G29/20

  Organic compounds not containing metal atoms · CPC title

• C10L2290/541

  Absorption of impurities during preparation or upgrading of a fuel · CPC title