ABSORPTION AGENT, METHOD OF MANUFACTURING SAME, AND METHOD FOR SEPARATION AND RECOVERY OF ACIDIC COMPOUND

• US 20190001259A1
• Filed: 12/13/2016
• Published: 01/03/2019
• Est. Priority Date: 12/22/2015
• Status: Active Grant

• Current Assignee: Klaus Schmidt, Nagoya University
• Original Assignee: Klaus Schmidt, Nagoya University
• Inventors: MATSUOKA, Akira, KISHIMOTO, Akira, MACHIDA, Hiroshi, HORIZOE, Hirotoshi
• Granted Patent: US 11,185,814 B2
• Time in Patent Office: Days
• CPC Class Codes: B01D 2252/202 Alcohols or their derivatives
• CPC Class Codes: B01D 2252/2025 Ethers or esters of alkylene glycols, e.g. ethylene or propylene carbonate
• CPC Class Codes: B01D 2252/2026 Polyethylene glycol, ethers or esters thereof, e.g. Selexol
• CPC Class Codes: B01D 2252/2041 Diamines
• CPC Class Codes: B01D 2252/20426 Secondary amines
• CPC Class Codes: B01D 2252/20478 Alkanolamines
• CPC Class Codes: B01D 2252/20489 with two or more hydroxyl groups
• CPC Class Codes: B01D 2252/504 Mixtures of two or more absorbents
• CPC Class Codes: B01D 2257/304 Hydrogen sulfide
• CPC Class Codes: B01D 2257/504 Carbon dioxide
• CPC Class Codes: B01D 2258/0283 Flue gases
• CPC Class Codes: B01D 53/14 by absorption
• CPC Class Codes: B01D 53/1418 Recovery of products
• CPC Class Codes: B01D 53/1425 Regeneration of liquid absorbents
• CPC Class Codes: B01D 53/1468 Removing hydrogen sulfide
• CPC Class Codes: B01D 53/1475 Removing carbon dioxide
• CPC Class Codes: B01D 53/1493 Selection of liquid materials for use as absorbents
• CPC Class Codes: B01D 53/52 Hydrogen sulfide
• CPC Class Codes: B01D 53/62 Carbon oxides
• CPC Class Codes: B01D 53/78 with gas-liquid contact
• CPC Class Codes: C10L 3/10 : Working-up natural gas or synthetic natural gas
• CPC Class Codes: Y02C 20/40 : of CO2

Abstract

The absorption agent of the present invention contains water, an amine compound, and an organic solvent, and a value obtained by subtracting a solubility parameter of the organic solvent from a solubility parameter of the amine compound is 1.1 (cal/cm³)^1/2 or more and 4.2 (cal/cm³)^1/2 or less. The method for separation and recovery of an acidic compound of the present invention includes the steps of: bringing a mixed gas containing an acidic compound into contact with an absorption agent containing water, an amine compound, and an organic solvent to absorb the acidic compound into the absorption agent; causing the absorption agent that has absorbed the acidic compound to be phase-separated into a first phase containing the acidic compound in a high content and a second phase containing the acidic compound in a low content; and heating the first phase to release the acidic compound from the first phase

Claims

1. :

An absorption agent, comprising

water,

an amine compound, and

an organic solvent,

wherein a value obtained by subtracting a solubility parameter of the organic solvent from a solubility parameter of the amine compound is from 1.1 to 4.2 (cal/cm³)^1/2.

2. :

The absorption agent according to claim 1,

wherein the amine compound is a secondary amine.

3. :

The absorption agent according to claim 1,

wherein the amine compound is an alkanolamine.

4. :

The absorption agent according to claim 1,

wherein the organic solvent is either an alcohol having 2 to 15 carbon atoms or an ether having 4 to 20 carbon atoms.

5. :

The absorption agent according to claim 1,

wherein the organic solvent is an alcohol in which hydrogen contained in a linear hydrocarbon having 3 to 8 carbon atoms is substituted with a hydroxyl group.

6. :

The absorption agent according to claim 1,

wherein the amine compound is contained in an amount of 20% by mass or more and 40% by mass or less.

7. :

The absorption agent according to claim 1,

wherein the organic solvent is contained in an amount of from 40% to 60% by mass.

8. :

A method of manufacturing an absorption agent, the method comprising;

mixing water, an amine compound, and an organic solvent; and

before the mixing, selecting the amine compound and the organic solvent so that a value obtained by subtracting a solubility parameter of the organic solvent from a solubility parameter of the amine compound is from 1.1 to 4.2 (cal/cm³)^1/2.

9. :

A method for separation and recovery of an acidic compound, the method comprising;

bringing a mixed gas comprising an acidic compound into contact with an absorption agent comprising water, an amine compound, and an organic solvent to absorb the acidic compound into the absorption agent;

causing the absorption agent that has absorbed the acidic compound to be phase-separated into a first phase comprising the acidic compound in a high content and a second phase comprising the acidic compound in a low content; and

heating the first phase to release the acidic compound from the first phase,

wherein a value obtained by subtracting a solubility parameter of the organic solvent from a solubility parameter of the amine compound is from 1.1 to 4.2 (cal/cm³)^1/2.