CN101422684A - Solvent capable removing COS from acid gas flow - Google Patents
Solvent capable removing COS from acid gas flow Download PDFInfo
- Publication number
- CN101422684A CN101422684A CNA2007101350318A CN200710135031A CN101422684A CN 101422684 A CN101422684 A CN 101422684A CN A2007101350318 A CNA2007101350318 A CN A2007101350318A CN 200710135031 A CN200710135031 A CN 200710135031A CN 101422684 A CN101422684 A CN 101422684A
- Authority
- CN
- China
- Prior art keywords
- cos
- gas
- absorbent
- weight ratio
- solvent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
The invention belongs to the technical field of gas purification and in particular relates to a solvent for eliminating COS from acid airflows and a using method thereof. The acid airflows comprise natural gas, synthesis gas, refinery gas, liquefied petroleum gas, and the like. A compound amine aqueous solution is used as an absorbent; an appropriate amount of activator is added; most of COS is eliminated under the condition that the elimination ratio of CO2 is not high; and the absorbent can be regenerated and used cyclically. The using method has higher elimination ratio of COS than the elimination ratio of the conventional amine method.
Description
Technical field:
The invention belongs to the gas purification technique field, be specifically related to from acid gas stream, remove solvent and the using method thereof of COS.This acid gas stream comprises natural gas, synthesis gas, refinery gas, liquefied petroleum gas etc.
Background technology:
Usually contain H in the industrial gasses
2S, CO
2With objectionable impurities such as COS, various mercaptan, thioethers, before further utilizing, they must removed totally, up to the present, the technology that is applied to the decarburization of qi exhaustion sulphur is descended hundreds of.Modal is that acid gas stream contacts in gas cleaning plant with organic solvent (or aqueous solution of organic solvent).A large amount of patent documentations have been arranged in these processes.Generally speaking, two kinds of different gas purification solvents are roughly arranged.
First kind is physical solvent, and what lean on is Physical Absorption.Typical physical solvent has the mixture of sulfolane and its derivative, straight chain acid amides, NMP (N-methyl pyrrolidone), N-alkyl pyrrolidone, relevant pyrrolidones, methyl alcohol and polyvinyl alcohol dialkyl ether.
Another kind is a chemical solvent.Based on chemical reaction, make sour gas generate the compound of easily removing.For instance, industrial the most frequently used chemical solvent is a hydramine, because the salt that generates decomposes easily or carried by steam gas easily, therefore amine can recycle.From air-flow, remove the MDEA that the reasonable amine of acid ingredient has monoethanolamine (MEA), diethanol amine (DEA), triethanolamine (TEA), diisopropanolamine (DIPA) (DIPA), amido ethoxy ethanol (AEE), methyl diethanolamine (MDEA) and added various activators.
Usually, above-mentioned solvent is to removing H
2S and CO
2Have higher efficient, but then there are many difficulties in COS.Physical solvent can be removed COS fully, but this process is inappropriate, because these physical solvents can absorb other linear paraffin, regeneration deals with very expensive.In the chemical solvent, primary amine and secondary amine and COS directly react the loss increase that generates metastable compound and cause effective amine, also can cause the corrosion of equipment simultaneously, and tertiary amine then only depends on physical dissolution to remove COS, and its effect is obviously very poor.
Therefore, there is Many researchers to propose suggestion, comprises removing COS:
Adopt the COS hydrolyst that COS is hydrolyzed into H
2S and CO
2, and then with alkanolamine solution with H
2S and CO
2Remove;
Air-flow is contacted with the mixed solvent of MDEA and DIPA, and here 50%～80% COS is hydrolyzed into H
2S and CO
2The remaining peralkaline amine liquid of the air communication that contains COS washs into Na
2S or Na
2CO
3At last, Yu Xia COS removes by alkali lye.This process comprises three sections, all will regenerate for every section, therefore deals with expensive;
Air-flow is contacted with the pure amine solvent that has added catalyst, and COS is hydrolyzed into H
2S and CO
2After be absorbed and remove.But this method need be at CO
2Could partly remove COS under the very high situation of removal efficiency.
Summary of the invention:
The present invention adopts a kind of varies aqueous solution to make absorbent, adds an amount of activator, can be at CO
2Remove under the not high situation of rate, remove most COS, (as natural gas purification) reserve part CO in some processes
2Need.
The present invention adopts a kind of aqueous solution absorbent and air-flow counter current contacting and removes COS, absorbent contains the varies of 15-56% (weight ratio) and the activator of 3-12% (weight ratio), varies is made up of methyl diethanolamine (MDEA) and diisopropanolamine (DIPA) (DIPA), and activator is made up of ethylene glycol (EG) or glycerine (GL).
Usually varies concentration is 20～56% (weight ratios, down together), but is preferably 30～50%, and wherein, MDEA:DIPA is 2-3:1;
In the varies aqueous solution used in the present invention, also can comprise additive as corrosion inhibitor, defoamer and similar components.Typically, the concentration range of these additives is 0.01%～5% (wt), and the use of these additives is that present technique field personnel are known.
Adopt the employed device of solvent removal COS of the present invention can with habituation use identical.Even the CO in the air-flow
2And COS is removed by contacting with the mixed amine aqueous solution of the present invention.
Absorption process can one-time-reach-place, also can continuous several times carry out.Can use the solution of multiply to carry out the gas-liquid contact among the latter from the order that reduces successively by temperature to cat head at the bottom of the tower.
The rich solution that has absorbed acid gas is realized regeneration by decompression, can realize by choke valve.The energy that rich solution contains can reclaim by turbine.
Flash tank can be adopted when removing acid gas, also repeatedly flash distillation can be carried out.Rich solution passes through and further regenerates the back and then be recycled to absorption step after the flash distillation.
Any known equipment in this area may be used to absorb, regenerate and other step.
Specific implementation method
Below the invention will be further described by embodiment, its objective is in order to understand content of the present invention better, but it does not limit protection scope of the present invention.
Embodiment:
Operating characteristics to concrete absorbent on an experimental rig is directly measured.The absorption tower internal diameter 20mm of test usefulness, interior dress φ 3 * 3 stainless steel θ ring, regenerator internal diameter 50mm, interior dress φ 6 * 6 * 1 porcelain Raschig ring, reboiler is equipped with in the regenerator bottom.
The unstripped gas for preparing (contains CO
27.6%, COS382 * 10
-6) entering the solution counter current contacting that absorption tower bottom and cat head enter, the acid gas in the gas is absorbed, and purified gas comes out to enter gas-liquid separator from cat head and reclaims emptying after institute's droplets entrained.
The rich solution that has absorbed acid gas leads to the regenerator top at the bottom of the absorption tower, contact and obtain regeneration with the steam counter-flow of rising in regenerator.Lean solution after the regeneration is sent into absorption tower jacking row and is absorbed after cooling.The gas that comes out from regeneration overhead enters the regeneration gas cooler with the recovery of the water vapour the gas, and regeneration gas is emptying after separating.
Certain at gas flow, the operating characteristics of different absorbents sees Table one.
Table one: the operating characteristics of different composite absorbers
Table one data show uses absorbent composition of the present invention, and its removal efficiency to COS can obviously improve.Corrosion inhibitor, defoamer and the antisludging agent of amount.
Claims (7)
1. solvent of from acid gas stream, removing COS, it is characterized in that it adopts a kind of aqueous solution absorbent and air-flow counter current contacting and remove COS, absorbent contains varies and the weight ratio 3-12% activator of weight ratio 15-56%, varies is made up of methyl diethanolamine and diisopropanolamine (DIPA), and activator is made up of ethylene glycol or glycerine.
2. solvent according to claim 1 is characterized in that varies concentration weight ratio is 20～56% in the absorbent.
3. solvent according to claim 1 is characterized in that varies concentration weight ratio is 30～50% in the absorbent.
4. solvent according to claim 1 is characterized in that the weight ratio of methyl diethanolamine and diisopropanolamine (DIPA) is 2-3:1 in the varies.
5. solvent according to claim 1 is characterized in that absorption liquid is renewable.
6. solvent according to claim 1 is characterized in that adding in the absorption liquid corrosion inhibitor, defoamer and antisludging agent.
7. solvent according to claim 6 is characterized in that in the absorption liquid adding corrosion inhibitor, defoamer and the antisludging agent of weight ratio 0.01%～5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710135031A CN101422684B (en) | 2007-11-02 | 2007-11-02 | Solvent capable removing COS from acid gas flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710135031A CN101422684B (en) | 2007-11-02 | 2007-11-02 | Solvent capable removing COS from acid gas flow |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101422684A true CN101422684A (en) | 2009-05-06 |
| CN101422684B CN101422684B (en) | 2012-09-05 |
Family
ID=40613705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710135031A Active CN101422684B (en) | 2007-11-02 | 2007-11-02 | Solvent capable removing COS from acid gas flow |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101422684B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108367233A (en) * | 2015-12-22 | 2018-08-03 | 株式会社神户制钢所 | The separation and recovery method of absorbent and its manufacturing method and acid compound |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19828977A1 (en) * | 1998-06-29 | 1999-12-30 | Basf Ag | Absorbent for removing acidic components from gases |
| NZ544796A (en) * | 2003-07-22 | 2009-09-25 | Dow Global Technologies Inc | Regeneration of acid gas-containing treatment fluids |
| US20070148069A1 (en) * | 2005-12-23 | 2007-06-28 | Shrikar Chakravarti | Carbon dioxide recovery from flue gas and the like |
-
2007
- 2007-11-02 CN CN200710135031A patent/CN101422684B/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108367233A (en) * | 2015-12-22 | 2018-08-03 | 株式会社神户制钢所 | The separation and recovery method of absorbent and its manufacturing method and acid compound |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101422684B (en) | 2012-09-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101143286B (en) | Method for removing COS from acid airflow | |
| AU2013281027B2 (en) | Aqueous alkanolamine absorbent composition comprising piperazine for enhanced removal of hydrogen sulfide from gaseous mixtures and method for using the same | |
| CN101455932A (en) | Absorbing agent capable of removing sulfide from acid gas flow and method thereof | |
| CA2870164C (en) | Aqueous alkanolamine solution and process for the removal of h2s from gaseous mixtures | |
| CN101745289B (en) | Method for selectively removing H2S from gas mixture containing CO2 | |
| EP0796646B1 (en) | Method for the removal of carbon dioxide present in gases and absorbent | |
| CN100584432C (en) | From acid gas stream, remove the absorbent and the method for mercaptan | |
| CN100525883C (en) | Process for purifying gases | |
| CN101820975A (en) | Process for removal of hydrogen sulphide and carbon dioxide from acid gas stream | |
| CN101844035A (en) | High-efficient desulfurizing agent for removing hydrogen sulfide and organic mercaptan from mixed gas | |
| US4775519A (en) | Removal of acid gases from gas streams | |
| CN100427178C (en) | Solvent and method for simultaneous removal of hydrogen sulphide and carbon dioxide | |
| CN101676018A (en) | Method for selectively removing COS from acid gas flow | |
| CN104815525A (en) | Treating agent for mixing acid components in mixed gases | |
| CN111925846A (en) | High-efficiency thioether and thiophene removal solvent and application thereof | |
| KR101038764B1 (en) | Appraratus and method for solvent scrubbing co2 capture system | |
| CN101637689A (en) | Absorption solvent used for catching or separating carbon dioxide | |
| CA2963598C (en) | Aqueous solution of 2-dimethylamino-2-hydroxymethyl-1, 3-propanediol useful for acid gas removal from gaseous mixtures | |
| CN105498449B (en) | A kind of CO2Absorbent solution | |
| CN102049174A (en) | Method for partially separating carbon dioxide from gas mixture | |
| CN102343204A (en) | Method for removing sulfides from acidic gas flow | |
| CA2986035C (en) | An aqueous alkanolamine composition and process for the selective removal of hydrogen sulfide from gaseous mixtures | |
| CN106794415B (en) | Process for removing acid gases from gas mixtures using aqueous solutions of 2-dimethylamino-2-hydroxymethyl-1, 3-propanediol | |
| CN101422684B (en) | Solvent capable removing COS from acid gas flow | |
| CN104069716B (en) | Solvent for removing CO2 and sulfides in acidic airflow, and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Liuhe District of Nanjing City, Jiangsu province 210048 geguan Road No. 699 Patentee after: SINOPEC NANJING CHEMICAL RESEARCH INSTITUTE Co.,Ltd. Address before: Liuhe District of Nanjing City, Jiangsu province 210048 geguan Road No. 699 Patentee before: Nanhua Group Research Institute |
|
| CP01 | Change in the name or title of a patent holder |