Method for removing SOx from gas using ethylene glycol composite solution

Patent metadata

Field	Value
Publication number	US-9815017-B2
Application number	US-201415102291-A
Country	US
Kind code	B2
Filing date	Dec 3, 2014
Priority date	Dec 12, 2013
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

An ethylene glycol composite solution is used for removing SO x from a gas. The ethylene glycol composite solution is made by mixing ethylene glycol and/or polyethylene glycol with an organic acid and/or organic acid salt containing no nitrogen atom in a molecule. The ethylene glycol composite solution is brought into contact with the gas containing SO x to absorb the SO x in the gas. The ethylene glycol composite solution loaded with absorbed SO x is regenerated by heating, vacuuming, gas stripping, ultrasonic treatment, microwave treatment, or radiation treatment to release by-products of sulfur dioxide and sulfur trioxide, and the regenerated ethylene glycol composite solution is recycled for use.

First claim

What is claimed is:

1. A method for removing SO x from a gas, comprising:
mixing ethylene glycol, polyethylene glycol, or both ethylene glycol and polyethylene glycol with an organic acid, an organic acid salt, or both the organic acid and the organic acid salt to form a composite solution, wherein the organic acid and the organic acid salt are compounds that contain no nitrogen atoms;
bringing the composite solution into contact with the gas containing SO x to absorb the SO x in the gas, wherein SO x is SO 2 , SO 3 , or a mixture thereof, and
wherein the composite solution contains one or more additives selected from the group consisting of organic amines, amides, sulfones, sulfoxides, and metallorganic compounds.

2. The method for removing SO x from a gas according to claim 1 , wherein the organic acid is an organic monoacid, an organic polyacid, or a mixture thereof; the organic acid salt is an organic monoacid salt, an organic polyacid salt, or a mixture thereof.

3. The method for removing SO x from a gas according to claim 2 , wherein the organic acid is selected from the group consisting of formic acid, acetic acid, butyric acid, ethanedioic acid, propanedioic acid, butanedioic acid, tannin acid, polygallic acid, citric acid, and mixtures thereof, and
the organic acid salt is a carboxylic acid salt formed by combining the organic acid with one or more selected from the group consisting of sodium ions, potassium ions, magnesium ions, calcium ions, and transition metal ions.

4. The method for removing SO x from a gas according to claim 1 , wherein the composite solution contain less than 50% in mass of water, and less than 30% in mass of the organic acid, the organic salt, or both.

5. The method for removing SO x from a gas according to claim 1 , wherein a mass content of the additives in the composite solution is less than 10%.

6. The method for removing SO x from a gas according to claim 1 , wherein the composite solution absorbs the SO x in the gas under atmospheric pressure or an elevated pressure at a temperature of −20 to 80° C.

7. The method for removing SO x from a gas according to claim 1 , further comprising regenerating the composite solution loaded with absorbed SO x by heating, vacuuming, gas stripping, ultrasonic treatment, microwave treatment, or radiation treatment at a temperature of 0 to 300° C. to release SO x from the composite solution; and recycling the regenerated composite solution.

8. The method for removing SO x from a gas according to claim 1 , wherein the gas is a flue gas, a waste gas, an industrial raw material gas containing SO x , or mixtures thereof.

9. A method for removing SO x from a gas, comprising:
mixing ethylene glycol, polyethylene glycol, or both ethylene glycol and polyethylene glycol with an organic acid, an organic acid salt, or both the organic acid and the organic acid salt to form a composite solution, wherein the organic acid and the organic acid salt are compounds that contain no nitrogen atoms;
bringing the composite solution into contact with the gas containing SO x to absorb the SO x in the gas, wherein SO x is SO 2 , SO 3 , or a mixture thereof, the organic acid is selected from the group consisting of formic acid, acetic acid, butyric acid, ethanedioic acid, propanedioic acid, butanedioic acid, tannin acid, polygallic acid, citric acid, and mixtures thereof, and the organic acid salt is a carboxylic acid salt formed by combining the organic acid with one or more selected from the group consisting of sodium ions, potassium ions, magnesium ions, calcium ions, and transition metal ions.

Assignees

• Beijing Boyuan Hengsheng High-Technology Co Ltd
• Yongfeng Boyuan Ind Co Ltd Jiangxi Province
• Univ Beijing
• Beijing Boyuan Hengsheng High-Technology Co Ltd

Inventors

• Wei Xionghui
• Zou Meihua
• Wang Jun
• Chen Li
• Li Lifang
• Sun Yong
• Liu Jiaxu
• Hu Chun
• Li Xiangbin

Classifications

• B01D2252/2023

  Glycols, diols or their derivatives · CPC title

• B01D2257/302

  Sulfur oxides · CPC title

• B01D53/1493 Primary

  Selection of liquid materials for use as absorbents · CPC title

• B01D2258/0291

  from waste incineration plants · CPC title

• B01D2252/2026

  Polyethylene glycol, ethers or esters thereof, e.g. Selexol · CPC title