CN103638781A - Hydrogen sulfide gas trapping and absorbing medium - Google Patents
Hydrogen sulfide gas trapping and absorbing medium Download PDFInfo
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- CN103638781A CN103638781A CN201310648205.6A CN201310648205A CN103638781A CN 103638781 A CN103638781 A CN 103638781A CN 201310648205 A CN201310648205 A CN 201310648205A CN 103638781 A CN103638781 A CN 103638781A
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- hydrogen sulfide
- absorbing medium
- sulfide gas
- ionic liquid
- trapping
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Abstract
The invention discloses a hydrogen sulfide gas trapping and absorbing medium which can absorb hydrogen sulfide in a high-efficiency and high-selectivity manner. The hydrogen sulfide gas trapping and absorbing medium is characterized by consisting of anions and cations at a molar ratio of 1:1, wherein the cations and the anions are shown as chemical formulae. According to the hydrogen sulfide gas trapping and absorbing medium, ionic liquid which is designed and screened is high in selection efficiency and absorption efficiency for hydrogen sulfide gas, and purified gas cannot be secondarily polluted.
Description
Technical field
The present invention relates to a kind of hydrogen sulfide gas trapping absorbing medium, it can be efficiently, the absorbing hydrogen sulphide of high selectivity, reaches the object of Purge gas.
Background technology
A kind of pernicious gas with corrosivity highly dangerous of hydrogen sulfide.Nature mainly contains elemental sulfur, when these elemental sulfurs under bacterium or function of human activities, redox reaction occur and are reduced into hydrogen sulfide gas.In the industry production processes such as petroleum refining, natural gas extraction, ammonia synthesizing industry, coal gasification and liquefaction, water treatment, wine brewing, pharmacy and paper mill, all can produce a large amount of harmful hydrogen sulfide gas.Hydrogen sulfide not only seriously threatens personal safety, and can cause metallic conduit and equipment corrosion, causes even more serious potential safety hazard.Hydrogen sulfide in chemical process also can cause catalyst poisoning, thereby affects the quality of product or intermediate products.If by being transformed into hydrogen sulfide emission after its direct discharge or burning, can cause severe contamination to atmospheric environment.Therefore, must carry out hydrogen sulfide desulfurizing and purifying.
The industrial method that removes hydrogen sulfide has a lot, and wherein wet oxidation method is widely adopted with its outstanding advantage.During the desulfurization of wet oxidation method, by alkaline absorption solution absorbing hydrogen sulphide, generate sulfohydrate and sulfide, be oxidized to sulphur and water under catalyst action, catalyst continues to use after regenerating in air or oxygen.
The method has the high and desulfurizing agent of the desulfuration efficiency outstanding advantages such as can be recycled.But, because reaction is all carried out in the aqueous solution, and need adjusting doctor solution be alkalescent, with the carrying out of desulphurization reaction and desulfurizer regeneration cyclic process, the product water that doctor solution is easily generated constantly dilutes.Must regular replenishment doctor solution and regulate and control the technological parameters such as pH value by water-reducible doctor solution in order to compensate, finally cause operational process of craft complicated, a large amount of discarded doctor solutions cause serious secondary pollution.
Chinese patent (ZL01133366.9) discloses a kind of method that removes hydrogen sulfide, by hydrogen sulfide containing waste gas at 180 ℃～320 ℃ with Main Ingredients and Appearance be ZnO ?TiO2 ?the desulfurizing agent of Al2O3 contact, hydrogen sulfide and organic sulfur are removed simultaneously.Although it is high that the method has advantages of desulfuration efficiency, because solid absorbent ZnO ?TiO2 ?Al2O3 regeneration is a large problem, when solving hydrogen sulfide contamination, produced again a large amount of solid waste.Given this, Development of Novel is efficient, and the H2S SCAVENGER that can be repeatedly used has important scientific research and practical significance.
Ionic liquid as its name suggests, is the compound being comprised of zwitterion completely.Diverse zwitterion can be combined into miscellaneous ionic liquid.By selecting different zwitterions, or directly introducing specific functional group modifies, character to ionic liquid, as fusing point, viscosity, hydrophobicity are adjusted, meet different needs, design to sour gas, to be particularly the ionic liquid that hydrogen sulfide has higher selective and solubility.
Ionic liquid does not almost have volatile feature to make it compare and have inborn advantage with traditional absorbent solution, this is mainly reflected in absorption process, ionic liquid can not enter gas phase, brings thus the advantage of two aspects: on the one hand, ionic liquid can not bring loss because of the volatilization of self; On the other hand, in the gas that purified gas and desorb obtain, can not contain absorbing medium yet.By our experimental studies have found that, this novel ion liquid is Physical Absorption process to the absorption main process of sour gas, and process is reversible, and regeneration easily.We are the means in conjunction with experiment by computer simulation, have designed sour gas, and particularly hydrogen sulfide etc. has the novel ion liquid of good adsorption and solubility property, for atmospheric cleaning and dusty gas reduction of discharging provide new thinking.
Summary of the invention
The present invention relates to a kind of hydrogen sulfide gas trapping absorbing medium, can be efficiently, the absorbing hydrogen sulphide gas of high selectivity, it is selectively good to have, large, the reusable feature of adsorbance.
The concrete technical scheme adopting of the present invention is
A hydrogen sulfide gas trapping absorbing medium, is characterized in that, described hydrogen sulfide gas trapping absorbing medium is the ionic liquid consisting of according to mol ratio 1:1 yin, yang ion, wherein
Described cationic chemical formula is:
The chemical formula of described anion is:
The using method of described hydrogen sulfide gas trapping absorbing medium, comprising: the 1) absorption of trapping absorbing medium to hydrogen sulfide gas, and absorbing temperature is 5 ℃～30 ℃, absorption dividing potential drop is 0.001～0.1MPa; 2) desorb of trapping absorbing medium, desorption temperature be at 70 ℃～160 ℃, pass into nitrogen 20 ?60 minutes.
Preferably, absorbing temperature is 10 ℃～20 ℃, and absorption dividing potential drop is 0.02～0.1MPa; Desorption temperature is 80 ℃～100 ℃.
Compared with prior art, beneficial effect of the present invention is:
1) the present invention uses the ionic liquid without obvious saturated vapor pressure, can not cause secondary pollution to institute's Purge gas.
2) the present invention does not use and has corrosive alkaline absorbent, thereby has avoided harm that equipment and operator ' s health are brought.
3) adopt the ionic liquid with screening through design, hydrogen sulfide gas is had to high selection and absorption efficiency, thereby improved absorption efficiency, reduced cost.
The specific embodiment
Experimental technique: the hydrogen sulfide of certain dividing potential drop (all the other gases to be clean adopt chemically inert nitrogen to simulate for experiment is convenient), at a certain temperature by packing the Drexel bottle of certain ionic liquid into, is adjusted to the time of staying of absorption process by adjusting gas flow rate.By the weightening finish of the spectroscopy means such as infrared spectrum, nuclear magnetic resonance and ionic liquid, calculate the quality (amount of substance) of adsorption of hydrogen sulfide.Desorb is under rising temperature (70 ℃～100 ℃) condition, passes into the regeneration that nitrogen is realized adsorbent ionic liquid for 30 minutes.
Embodiment 1～6
Under 20 ℃ of conditions, according to above-mentioned experimental procedure, under different hydrogen sulfide sectional pressure conditions, respectively ionic liquid 1 is carried out to absorption experiment, result is as follows:
Note: the structure of ionic liquid 1 is:
Embodiment 7～12
Under 20 ℃ of conditions, according to above-mentioned experimental procedure, under different hydrogen sulfide sectional pressure conditions, respectively ionic liquid 2 is carried out to absorption experiment, result is as follows:
Note: the structure of ionic liquid 2 is:
lower same.
Embodiment 13～18
According to above-mentioned experimentation, we have investigated ionic liquid 1 is the experimental result of different temperatures under 0.1MPa condition at hydrogen sulfide sectional pressure, sees the following form:
Because the adsorption process of hydrogen sulfide in ionic liquid can be emitted heat, so rising temperature is unfavorable for the absorption of hydrogen sulfide, suitable absorption temperature is advisable at 20 ℃.
Embodiment 19～24
According to above-mentioned experiment condition, we investigate ionic liquid 1 and repeat power of regeneration, pass into nitrogen 30 minutes, to adsorbing the ionic liquid of saturated (dividing potential drop 0.1MPa), carry out desorption experiment, and experimental result is as follows:
Embodiment 25～34
We have investigated the reusable performance of ionic liquid, and by absorbing saturated ionic liquid 1, at 20 ℃, dividing potential drop is under 0.1MPa condition, according to above-mentioned experimental procedure, repeats adsorption experiment, and experimental result is as follows:
By above-mentioned experimental result, visible ionic liquid has good repeat performance, reuses 10 times, and absorbent properties have no obvious reduction, have prospect capable of being industrialized.
Claims (3)
1. a hydrogen sulfide gas trapping absorbing medium, is characterized in that, described hydrogen sulfide gas trapping absorbing medium is the ionic liquid consisting of according to mol ratio 1:1 yin, yang ion, wherein
Described cationic chemical formula is:
The chemical formula of described anion is:
2. the using method of the hydrogen sulfide gas of claim 1 trapping absorbing medium, is characterized in that, comprising: the 1) absorption of trapping absorbing medium to hydrogen sulfide gas, and absorbing temperature is 5 ℃～30 ℃, absorption dividing potential drop is 0.001～0.1MPa; 2) desorb of trapping absorbing medium, is to pass into nitrogen 20-60 minute at 70 ℃～160 ℃ at desorption temperature.
3. the using method of hydrogen sulfide gas trapping absorbing medium according to claim 2, is characterized in that, absorbing temperature is 10 ℃～20 ℃, and absorption dividing potential drop is 0.02～0.1MPa; Desorption temperature is 80 ℃～100 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310648205.6A CN103638781A (en) | 2013-12-04 | 2013-12-04 | Hydrogen sulfide gas trapping and absorbing medium |
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| CN201310648205.6A CN103638781A (en) | 2013-12-04 | 2013-12-04 | Hydrogen sulfide gas trapping and absorbing medium |
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| CN103638781A true CN103638781A (en) | 2014-03-19 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08332338A (en) * | 1995-06-06 | 1996-12-17 | Ishikawajima Harima Heavy Ind Co Ltd | Absorption column |
| US20110223085A1 (en) * | 2010-03-12 | 2011-09-15 | E. I. Du Pont De Nemours And Company | Carbon dioxide capture with ionic liquid electrospray |
| CN103059062A (en) * | 2012-12-11 | 2013-04-24 | 宁波豪城合成革有限公司 | Functionalized ion liquid and application thereof |
| CN103159632A (en) * | 2013-02-28 | 2013-06-19 | 南京大学 | Ionic liquid compound with anion containing double Lewis base functional groups, preparation method thereof and application thereof |
| US20130164199A1 (en) * | 2010-09-03 | 2013-06-27 | Marty Lail | Regenerable solvent mixtures for acid-gas separation |
-
2013
- 2013-12-04 CN CN201310648205.6A patent/CN103638781A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08332338A (en) * | 1995-06-06 | 1996-12-17 | Ishikawajima Harima Heavy Ind Co Ltd | Absorption column |
| US20110223085A1 (en) * | 2010-03-12 | 2011-09-15 | E. I. Du Pont De Nemours And Company | Carbon dioxide capture with ionic liquid electrospray |
| US20130164199A1 (en) * | 2010-09-03 | 2013-06-27 | Marty Lail | Regenerable solvent mixtures for acid-gas separation |
| CN103059062A (en) * | 2012-12-11 | 2013-04-24 | 宁波豪城合成革有限公司 | Functionalized ion liquid and application thereof |
| CN103159632A (en) * | 2013-02-28 | 2013-06-19 | 南京大学 | Ionic liquid compound with anion containing double Lewis base functional groups, preparation method thereof and application thereof |
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Application publication date: 20140319 |