Absorbent for acidic gas separation and method for acidic gas separation

Patent metadata

Field	Value
Publication number	US-2016114286-A1
Application number	US-201514919198-A
Country	US
Kind code	A1
Filing date	Oct 21, 2015
Priority date	Oct 24, 2014
Publication date	Apr 28, 2016
Grant date	—

Abstract

Disclosed are an absorbent for acidic gas separation that include: an amount of about 1 wt % to 17.5 wt % of alkali-carbonate based on the total weight of the absorbent; an amount of about 1 wt % to 5.5 wt % of a heterocyclic amine compound based on the total weight of the absorbent; 1 wt % to 8 wt % of an alkyl substituent of the heterocyclic amine compound based on the total weight of the absorbent; and a residual amount of an aqueous solution; and a method for acidic gas separation that include: contacting the absorbent for acidic gas separation and a gas including an acidic gas.

First claim

What is claimed is:

1 . An absorbent for acidic gas separation comprising:
an amount of about 1 wt % to 17.5 wt % of alkali-carbonate based on the total weight of the absorbent; an amount of about 1 wt % to 5.5 wt % of a heterocyclic amine compound based on the total weight of the absorbent; an amount of about 1 wt % to 8 wt % of an alkyl substituent of the heterocyclic amine compound based on the total weight of the absorbent; and a residual amount of water, wherein an absorption amount of carbon dioxide is about 1.160 mol CO 2 /mol (solution) or greater

2 . The absorbent for acidic gas separation of claim 1 , wherein a solid salt in an amount of about 0.5 wt % or less based on the total weight of the absorbent is precipitated on the absorbent for acidic gas separation.

3 . The absorbent for acidic gas separation of claim 1 , wherein the alkali-carbonate includes at least one selected from the group consisting of potassium carbonate (K 2 CO 3 ), sodium carbonate (Na 2 CO 3 ), sodium hydroxide (NaOH), potassium hydroxide (KOH), potassium bicarbonate (KHCO 3 ) and sodium bicarbonate (NaHCO 3 ).

4 . The absorbent for acidic gas separation of claim 1 , wherein the heterocyclic amine compound includes a compound represented by Chemical Formula 1 below:

in Chemical Formula 1, X is —O—, —S—, or —NH—.

5 . The absorbent for acidic gas separation of claim 1 , wherein the heterocyclic amine compound includes piperazine.

6 . The absorbent for acidic gas separation of claim 1 , wherein the alkyl substituent of the heterocyclic amine compound includes a compound represented by Chemical Formula 2 below:

in Chemical Formula 2, X is —O—, —S—, or —NH—, and
R 1 and R 2 each is a straight or branched chain C 1 to C 4 alkyl group.

7 . The absorbent for acidic gas separation of claim 1 , wherein the alkyl substituent of the heterocyclic amine compound includes 2-methyl piperazine.

8 . The absorbent for acidic gas separation of claim 1 , wherein a weight ratio of the alkyl substituent of the heterocyclic amine compound to the heterocyclic amine compound is from about 0.8 to about 1.5.

9 . The absorbent for acidic gas separation of claim 1 , wherein a total content of the heterocyclic amine compound and the alkyl substituent of the heterocyclic amine compound is of about 8 wt % to 12 wt %.

10 . The absorbent for acidic gas separation of claim 1 , wherein the alkali-carbonate is included in an amount of about 14 wt % to 17 wt % based on the total weight of the absorbent; piperazine is included in an amount of about 4 wt % to 5.5 wt % based on the total weight of the absorbent; 2-methyl piperazine is included in an amount of about 4 wt % to 7 wt % based on the total weight of the absorbent; and water is included in a residual amount.

11 . The absorbent for acidic gas separation of claim 1 , further comprising:
at least one additive selected from the group consisting of a corrosion inhibitor, a coagulant aid, an oxygen inhibitor and an anti-foaming agent.

12 . A method for acidic gas separation comprising:
contacting the absorbent for acidic gas separation of claim 1 and a gas including an acidic gas.

13 . The method for acidic gas separation of claim 12 , wherein
the absorbent for acidic gas separation and the gas including an acidic gas are contacted under conditions of a temperature of about 5° C. to 90° C. and an atmospheric pressure of about 0.5 to 5.

Assignees

• Hyundai Motor Co Ltd
• Korea Energy Research Inst

Inventors

• Bae Shin-Tae
• Nam Sungchan
• Park Sungyeoul
• Yoon Yeoil

Classifications

• B01D2252/608

  Antifoaming agents · CPC title

• B01D2252/20447

  containing a piperazine-ring · CPC title

• B01D2252/604

  Stabilisers or agents inhibiting degradation · CPC title

• B01D2258/0283

  Flue gases · CPC title

• B01D2251/306

  of potassium · CPC title