PHASE TRANSITIONAL ABSORPTION METHOD

• US 20070237695A1
• Filed: 04/07/2006
• Published: 10/11/2007
• Est. Priority Date: 04/07/2006
• Status: Active Grant

• Current Assignee: Liang Hu
• Original Assignee: Liang Hu
• Inventors: Hu, Liang
• Granted Patent: US 7,541,011 B2
• Time in Patent Office: Days
• US Class Current: 423/224
• CPC Class Codes: B01D 53/1425 Regeneration of liquid absorbents

Abstract

The present invention is directed to an improved method and system for separating and purifying gas using gas-liquid absorption. According to this invention, the method is carried out in an absorber, where a liquid absorbent, a gas mixture containing a gas to be absorbed were introduced from an inlet. During absorption, the second liquid phase was separated out from the absorbent. The absorbed gas was accumulated in one of liquid phases. After absorption, two liquid phases were separated. One of the liquids with rich absorbed gas was forward to regenerator. After regeneration, the liquid was cycled back to absorber. The liquid phase with lean absorbed gas was back to absorber directly to complete the cycle.

Claims

1. A method for separating a gas from gas mixture by absorbing it with a liquid which is able to selectively absorb the gas, the method comprising:

Introducing a liquid absorbent into the absorber through an inlet;

said liquid absorbent consists of a plurality of compounds, said compounds that reacts with the absorbed gas is activated agent, said compound that do not react with the absorbed gas are solvents, the activated agent and the solvent form a solution;

Introducing the gas mixture into the absorber through an inlet, allowing the liquid absorbent to absorb the gas and to convert it into absorbed gas;

Allowing absorbed gas to react with said activated agent in liquid absorbent to form new compound where said new compound is separated out from liquid absorbent and forms new liquid phase, the gas rich phase;

Separating the gas rich phase with the gas lean phase, solvent;

Cycling the solvent back to the absorber;

Regenerating the gas rich phase in regeneration column;

Collecting the gas from the gas rich phase in the regeneration column; and

Cycling the activated agent back to absorbent.

2. The method of claim 1, wherein the gas mixture contains 0.001 to 99.999% of gas by weight,

The method of claim 1, wherein said activated agent and solvent form an absorbent.

5. The method of claim 1, wherein the absorbed gas reacts or combines with activated agent in liquid absorbent to form new compound where said new compound is separated out from liquid absorbent and forms new liquid phase, the gas rich phase.

6. The method of claim 1 further comprising the gas rich phase and the gas lean phase are separated before regeneration where said gas lean phase is cycled back to absorber directly and said gas rich phase is forward to regeneration.

7. The method of claim 1, wherein the gas in gas mixture is selected from the group consisting of CO₂, SO₂, H₂S, COS, fluorides, HCl, and combinations thereof.

8. The method of claim 1 further comprising maintaining the temperature of the absorber within the range from about 1°

C. to about 300°

C.; and

the pressure of the absorber within the range from about 0.0001 to 10000 atm.

9. The method of claim 1, wherein collecting the gas from the gas rich phase in regeneration column.

10. The method of claim 1 further comprising recycling the solvent back to the absorber after separating with the gas rich phase.

11. The method of claim 1 further comprising recycling the activated agent back to the absorber after regeneration.

3. The method of claim 3 further comprising the ratio of activated agent and solvent is from about 1:

10000 to about 10000;

1 by volume.

4. The method of claim 3, wherein the activated agent is made of the members selected from the group consisting of alkaline salts, ammonium and ammonia, alkanolamines, amines, amides and combinations thereof;

and wherein the solvent is made of the members selected from the group consisting of water, alkanes, unsaturated hydrocarbons, alcohols, ethers, aldehydes, ketones, esters, carbohydrates and combinations thereof.