CN109876601B - Process method for absorbing sulfur dioxide in flue gas by functionalized ionic liquid and regenerating by Claus reaction at low temperature - Google Patents
Process method for absorbing sulfur dioxide in flue gas by functionalized ionic liquid and regenerating by Claus reaction at low temperature Download PDFInfo
- Publication number
- CN109876601B CN109876601B CN201910209324.9A CN201910209324A CN109876601B CN 109876601 B CN109876601 B CN 109876601B CN 201910209324 A CN201910209324 A CN 201910209324A CN 109876601 B CN109876601 B CN 109876601B
- Authority
- CN
- China
- Prior art keywords
- absorbent
- reaction kettle
- ionic liquid
- mixture
- absorption
- 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.)
- Active
Links
Abstract
The invention provides a method for absorbing sulfur dioxide (SO) in flue gas by using functional ionic liquid2) And low-temperature regeneration by using a Claus reaction. The process method comprises the step of preparing the low-viscosity absorbent by the functionalized ionic liquid and glycol or waterAbsorbing low-concentration SO in flue gas at a certain temperature2Then with hydrogen sulfide (H)2S) and absorbed SO2Reacting at a certain temperature and pressure to generate solid sulfur and separating, thereby regenerating the functionalized ionic liquid. The method realizes the low-concentration SO in the flue gas by using the functional ionic liquid which is environment-friendly, good in thermal stability and capable of being recycled2The regeneration of the absorbent and the SO are realized with high efficiency and low energy consumption by utilizing the Claus reaction2The resource utilization reduces the energy consumption in the regeneration process and avoids the generation of regeneration byproducts.
Description
Technical Field
The invention relates to a method for absorbing sulfur dioxide (SO) in flue gas by using functionalized ionic liquid2) And low-temperature regeneration by using a Claus reaction. In particular, the invention relates to the absorption of low-concentration SO in flue gas by functionalized ionic liquid solution2Then absorb SO2Introducing H into the functionalized ionic liquid solution2S, performing a Claus reaction to obtain solid sulfur, separating the solid sulfur from a system, and regenerating the functionalized ionic liquid solution.
Technical Field
Sulfur dioxide (SO)2) Is one of the atmospheric pollutants which are harmful to the environmental safety, and is mainly derived from flue gas, such as coal-fired flue gas, sintering flue gas and the like. SO (SO)2Not only does the emissions affect the health of people, but also can cause serious environmental problems. At the same time, SO2Is an important sulfur resource and can be used for preparing sulfur and sulfuric acid. The sulfur and the sulfuric acid are widely applied and in large demand in agriculture and industry. At present, the sulfur resource supply in China has a large gap, for example, in 2016, the imported sulfur in China reaches 11960kt and accounts for 68.5 percent of the total sulfur amount [ Jiluojun, industrial metabolism and circular economy of sulfur resources in China [ J]Sulfuric acid industry, 2017(12):1-8]. Therefore, SO recovery from flue gases2And the resource is recycled, SO that SO is reduced2Environmental problems caused by discharge can relieve the import pressure of sulfur resources in China to a certain extent, and the method has important practical significance.
Among the various flue gas desulfurization techniques, wet desulfurization techniques are most widely used. Wherein the calcium method is to utilize CaO and CaCO3、Ca(OH)2Etc. with SO2Reaction for removing SO in flue gas2The method has the advantages of low cost of the desulfurizer, wide source, high desulfurization efficiency and the like, and is the most common technical means. However, the method has the problems that the desulfurizer can not be regenerated, the sulfur resource can not be recovered, a large amount of byproducts are generated, and the desulfurizer can be reduced to secondary pollutants. Ammonia desulphurization is another wet desulphurization technology and utilizesThe ammonia water is used as an absorbent, SO that SO in the flue gas can be efficiently removed2However, ammonia water is volatile, and has the problems of absorbent loss, secondary pollution and the like. Therefore, an efficient SO was sought2Methods of capture and recovery are at hand.
In recent years, the ionic liquid has the advantages of low steam pressure, good thermal stability, large gas absorption amount, renewability and the like, SO that the ionic liquid can absorb SO in flue gas2The method has attracted the attention of people. Conventional ionic liquids are capable of absorbing SO at high concentrations (or high partial pressures)2But for low or very low concentrations of SO in flue gases2There is little absorption effect. And the functionalized ionic liquid and SO2Has special chemical action and low SO content in flue gas2Can also effectively capture and absorb SO2The functionalized ionic liquid can be regenerated to recover SO2. Therefore, the functionalized ionic liquid removes SO in the flue gas2Has wide application prospect. Regeneration and SO of functionalized ionic liquids reported SO far2The recovery method comprises the following steps: (1) regeneration of the absorbent and SO by means of heating and pressure reduction2Recovery of (2) regeneration of the absorbent and SO by means of heating and steam stripping2And (4) recovering. Both methods can realize effective regeneration of common flue gas desulfurization functionalized ionic liquid, but have certain defects. For example, both methods are carried out under high temperature conditions, which requires a large amount of energy consumption, is not economical, and affects the stability of the absorbent, etc.; simultaneously, steam stripping to obtain SO2The mixed gas with water vapor is difficult to separate, and SO can not be realized2Both of these problems affect the application of the above process. Another type of regeneration method for functionalized ionic liquids reported in recent years is to regenerate SO2The ionic liquid is converted into other substances, and the regeneration of the ionic liquid is realized. For example: (1) acid-base neutralization to absorb SO2Neutralizing the ionic liquid with ammonia water to a certain pH value>9) And then carrying out low-temperature concentration crystallization and centrifugal separation to obtain ammonium sulfate crystals and regenerated ionic liquid. The desulfurization performance of the regenerated ionic liquid is not reduced.However, the method has the problems that ammonia water is volatile, and waste water is generated to pollute the environment and the like. (2) Cycloaddition in absorbing SO2The epoxy compound is added into the ionic liquid, the cyclic sulfide with the yield higher than that of the cyclic sulfide obtained by the conventional synthetic method can be obtained without adding any catalyst, and the ionic liquid is regenerated. However, the method needs to be carried out at high temperature and high pressure, and the epoxide is extremely easy to explode and difficult to be practically applied. In summary, several conventional ionic liquid regeneration methods have some disadvantages, which hinder further industrial application of the functionalized ionic liquid.
Therefore, a method for absorbing low concentrations of SO was sought2Low temperature regeneration of functionalized ionic liquids and SO2The resource utilization method has very important significance. Experiments show that the Claus reaction in the functionalized ionic liquid has the advantages of high conversion rate, mild reaction conditions and the like, and further low-concentration SO in the absorbed flue gas2Introducing H into the functionalized ionic liquid2S gas, passing through H at low temperature2S and SO2The mixture of solid sulfur and absorbent is obtained by reaction, and the regenerated functionalized ionic liquid absorbent and high-purity sulfur are obtained by separation. Compared with the traditional regeneration method, the method has the advantages of low regeneration energy consumption, high efficiency, easy separation of regenerated products, no by-product, environmental friendliness and the like, and is suitable for large-scale application.
Disclosure of Invention
The invention aims to solve the problem of high regeneration energy consumption in the process of functional ionic liquid flue gas desulfurization. Absorbing low-concentration SO in flue gas by functionalized ionic liquid by using Claus method2Then introducing H2S reacts to regenerate the functionalized ionic liquid and SO2And obtaining resource utilization.
The purpose of the invention is realized by adopting the following technical scheme.
Functional ionic liquid for absorbing SO in flue gas2And the low-temperature regeneration process with Claus reaction includes the following steps: firstly, preparing a low-viscosity absorbent from a functionalized ionic liquid and a solvent; secondly absorbing with the absorbentReceive low-concentration SO in flue gas2To obtain a solution containing SO2The functionalized ionic liquid absorbent solution of (a); then H is introduced2S is introduced into a reactor containing SO2Performing a Claus reaction in the functionalized ionic liquid absorbent solution to obtain solid sulfur, separating a sulfur product and simultaneously obtaining a filtrate; finally, the filtrate is distilled under reduced pressure to remove the water generated by the Claus reaction, and the regenerated absorbent is obtained.
In the above method, the functionalized ionic liquid is selected from ethanolamine lactate ([ MEA)]L), tetramethylguanidine lactate ([ TMG ]]L), tetraethylammonium lactate ([ N ]2222]L), 1-butyl-3-methylimidazolium lactate ([ Bmim)]L)。
In the above method, the solvent is selected from the group consisting of ethylene glycol and water.
In the method, the mass fraction of the functionalized ionic liquid forming the absorbent is 30-70%.
In the above process, the SO2The absorption temperature is 20-60 ℃.
In the method, H is introduced into the Claus reaction2The pressure of S is 0.9-1.2 MPa, and H2S and SO2The molar ratio of (A) to (B) is 2.2:1 to 2.9: 1.
In the method, the temperature of the Claus reaction is 30-60 ℃.
The principle of the method of the invention is as follows: h is to be2S is introduced into and absorbs SO in the flue gas2In the latter functionalized ionic liquid, the claus reaction occurs: 2H2S+SO2＝3/8S8+2H2And O. The ionic liquid provides a good environment for the Claus reaction, the unique ionic existence form of the ionic liquid ensures that the ionic liquid has certain capability of catalyzing the Claus reaction, the Claus reaction can be carried out without adding any catalyst in the reaction, and the reaction rate is high. The ionic liquid has low volatility and good stability and is mixed with acid gas (SO)2And H2S) have excellent affinity, all making them excellent solvents for liquid phase Claus reactions.
Compared with the calcium desulphurization technology, the invention has the following beneficial effects: can recover SO2Realization of SO2Recycling; no solid waste is generated. Compared with the ammonia desulphurization technology, the invention has the following beneficial effects: the absorbent has low vapor pressure, good thermal stability and environmental protection. Compared with the conventional ionic liquid desulfurization technology, the method has the following beneficial effects: the used functionalized ionic liquid can be used for treating low-concentration SO in flue gas2Has better absorption performance. Compared with the prior high-temperature regeneration technology of the functionalized ionic liquid, the method has the following beneficial effects: the functionalized ionic liquid has low regeneration temperature and low energy consumption, and the regenerated product is solid sulfur which is easy to separate from the system. Compared with the prior acid-base neutralization regeneration technology of the functionalized ionic liquid, the method has the following beneficial effects: a cooling step is not needed, so that energy consumption is saved; no waste water is generated, and the harm to the environment is small. Compared with the prior cycloaddition method, the method has the following beneficial effects: the reaction condition is mild and controllable, and the danger coefficient is low.
Detailed Description
Example 1
This example is a comparative example. Comparing the absorption and regeneration characteristics of conventional ionic liquids and functionalized ionic liquids.
Preparation of the absorbent: weighing conventional ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate ([ Bmim)]BF4)1.20g, adding 2.80g of ethylene glycol, and uniformly mixing to form 4.00g of absorbent solution with the mass fraction of 1-butyl-3-methylimidazolium tetrafluoroborate of 30.0%. Absorption of SO by an absorbent2: immersing the glass test tube in 40 deg.C water bath to simulate Smoke (SO)2Volume content 2%, N2Volume content 98%) in 100cm3The mixture was bubbled into the glass tube at a rate of/min, and the absorption temperature was 40 ℃. Measuring SO absorbed by absorbent by gravimetric method after saturation2In an amount of 0.001g, calculated to give SO as a pair of absorbent2Has an absorption amount of 0.00025gSO2Per gram of absorbent. Regeneration of the absorbent: absorbing 3.90g of absorption liquid (containing 0.001g of SO)2) Placing the mixture in a 25ml reaction kettle, and introducing H2And (3) putting the S gas at 1.1MPa into a heating and stirring device, heating to 40 ℃, and starting magnetic stirring. After 2h of reactionAnd filtering and washing the mixture in the reaction kettle, wherein no solid sulfur is generated after drying. The conventional ionic liquid [ Bmim [ ]]BF4Solution to low concentration SO2Has small absorption amount and cannot be applied to low-concentration SO in flue gas2And (4) removing.
Example 2
Preparation of the absorbent: ethanolamine lactate ([ MEA ] was weighed]L)1.20g of the mixture is placed in a 25mL glass test tube, 2.80g of ethylene glycol is added, and the mixture is uniformly mixed to form 4.00g of absorbent solution with the mass fraction of the ethanolamine lactate being 30.0%. Absorption of SO by an absorbent2: immersing the glass test tube in 40 deg.C water bath to simulate Smoke (SO)2Volume content 2%, N2Volume content 98%) in 100cm3The mixture was bubbled into the glass tube at a rate of/min, and the absorption temperature was 40 ℃. Measuring SO absorbed by absorbent by gravimetric method after saturation2In an amount of 0.3117g, calculated to give SO as a pair of absorbent2Has an absorption amount of 0.078gSO2Per gram of absorbent. Regeneration of the absorbent: 3.47g of absorption liquid (containing 0.25g of SO) was sucked2) Placing the mixture in a 25ml reaction kettle, and introducing H2S gas 1.1MPa (H)2S and SO2With a molar ratio of 2.7:1), placing the reaction kettle into a heating and stirring device, heating to 40 ℃, and starting magnetic stirring. After reacting for 2h, the pressure of the reaction kettle is not changed any more, the reaction kettle is cooled and depressurized to terminate the reaction, the mixture in the reaction kettle is filtered, washed and dried to obtain the solid elemental sulfur with the generation amount of 0.3615g according to the absorbed SO2The yield of elemental sulphur was calculated to be 96% based on the theoretical amount of elemental sulphur generated.
Example 3
Preparation of the absorbent: ethanolamine lactate ([ MEA ] was weighed]L)2.00g of the mixed solution is placed in a 25mL glass test tube, 2.01g of ethylene glycol is added, and the mixture is uniformly mixed to form 4.01g of absorbent solution with 49.9 mass percent of ethanolamine lactate. Absorption of SO by an absorbent2: immersing the glass test tube in 40 deg.C water bath to simulate Smoke (SO)2Volume content 2%, N2Volume content 98%) in 100cm3The mixture was bubbled into the glass tube at a rate of/min, and the absorption temperature was 40 ℃. After absorption saturationGravimetric determination of SO absorption by absorbents2In an amount of 0.3669g, calculated to give SO as a pair of absorbent2Has an absorption amount of 0.091gSO2Per gram of absorbent. Regeneration of the absorbent: 2.98g of the absorbent (containing 0.25g of SO)2) Placing the mixture in a 25ml reaction kettle, and introducing H2S gas 1.1MPa (H)2S and SO2With a molar ratio of 2.7:1), placing the reaction kettle into a heating and stirring device, heating to 40 ℃, and starting magnetic stirring. After reacting for 3h, the pressure of the reaction kettle is not changed any more, the reaction kettle is cooled and decompressed to stop the reaction, the mixture in the reaction kettle is filtered, washed and dried to obtain 0.3605g of solid elemental sulfur, and the generation amount of the solid elemental sulfur is determined according to the absorbed SO2The yield of elemental sulphur was calculated to be 96% based on the theoretical amount of elemental sulphur generated.
Example 4
Preparation of the absorbent: ethanolamine lactate ([ MEA ] was weighed]L)2.80g of the mixture is placed in a 25mL glass test tube, 1.20g of ethylene glycol is added, and the mixture is uniformly mixed to form 4.00g of absorbent solution with 70 percent of ethanolamine lactate by mass. Absorption of SO by an absorbent2: immersing the glass test tube in 40 deg.C water bath to simulate Smoke (SO)2Volume content 2%, N2Volume content 98%) in 100cm3The mixture was bubbled into the glass tube at a rate of/min, and the absorption temperature was 40 ℃. Measuring SO absorbed by absorbent by gravimetric method after saturation2In an amount of 0.4796g, calculated to give SO as a pair of absorbent2Has an absorption amount of 0.120gSO2Per gram of absorbent. Regeneration of the absorbent: 2.33g of the absorbent (containing 0.25g of SO)2) Placing the mixture in a 25ml reaction kettle, and introducing H2S gas 1.1MPa (H)2S and SO2With a molar ratio of 2.7:1), placing the reaction kettle into a heating and stirring device, heating to 40 ℃, and starting magnetic stirring. After 4 hours of reaction, the pressure of the reaction kettle is not changed any more, the reaction kettle is cooled and decompressed to terminate the reaction, the mixture in the reaction kettle is filtered, washed and dried to obtain 0.3610g of solid elemental sulfur, and the generation amount of the solid elemental sulfur is determined according to the absorbed SO2The yield of elemental sulphur was calculated to be 96% based on the theoretical amount of elemental sulphur generated.
Example 5
Absorption ofPreparation of the agent: ethanolamine lactate ([ MEA ] was weighed]L)1.20g of the mixture is placed in a 25mL glass test tube, 2.80g of water is added, and the mixture is uniformly mixed to form 4.00g of absorbent solution with the mass fraction of the ethanolamine lactate being 30.0%. Absorption of SO by an absorbent2: immersing the glass test tube in 40 deg.C water bath to simulate Smoke (SO)2Volume content 2%, N2Volume content 98%) in 100cm3The mixture was bubbled into the glass tube at a rate of/min, and the absorption temperature was 40 ℃. After saturation, measuring SO absorption of absorbent by iodometry2In an amount of 0.2553g, calculated to give SO as a pair of absorbent2Has an absorption amount of 0.064gSO2Per gram of absorbent. Regeneration of the absorbent: 4.16g of the absorbent (containing 0.25g of SO) was sucked2) Placing the mixture in a 25ml reaction kettle, and introducing H2S gas 1.1MPa (H)2S and SO2With a molar ratio of 2.7:1), placing the reaction kettle into a heating and stirring device, heating to 40 ℃, and starting magnetic stirring. After 4 hours of reaction, the pressure of the reaction kettle is not changed any more, the reaction kettle is cooled and decompressed to terminate the reaction, the mixture in the reaction kettle is filtered, washed and dried to obtain 0.2550g of solid elemental sulfur, and the generation amount of the solid elemental sulfur is determined according to the absorbed SO2Calculated to yield an elemental sulphur yield of 68%.
Example 6
Preparation of the absorbent: ethanolamine lactate ([ MEA ] was weighed]L)2.01g of the mixture is placed in a 25mL glass test tube, 2.01g of water is added, and the mixture is uniformly mixed to form 4.02g of absorbent solution with 50.0 mass percent of ethanolamine lactate. Absorption of SO by an absorbent2: immersing the glass test tube in 40 deg.C water bath to simulate Smoke (SO)2Volume content 2%, N2Volume content 98%) in 100cm3The mixture was bubbled into the glass tube at a rate of/min, and the absorption temperature was 40 ℃. Measuring SO absorbed by absorbent by iodometry after saturation2In an amount of 0.2887g, calculated to give SO as a pair of absorbent2Has an absorption amount of 0.072gSO2Per gram of absorbent. Regeneration of the absorbent: 3.73g of the absorbent (containing 0.25g of SO)2) Placing the mixture in a 25ml reaction kettle, and introducing H2S gas 1.1MPa (H)2S and SO2In a molar ratio of 2.7:1)The reaction kettle is put into a heating and stirring device, the temperature is raised to 40 ℃, and magnetic stirring is started. After 4h of reaction, the pressure in the reaction kettle is not changed any more, the reaction kettle is cooled and depressurized to terminate the reaction, the mixture in the reaction kettle is filtered, washed and dried to obtain the solid elemental sulfur with the generation amount of 0.2715g according to the absorbed SO2Calculated to yield 72% elemental sulphur.
Example 7
Preparation of the absorbent: ethanolamine lactate ([ MEA ] was weighed]L)2.80g of the mixture is placed in a 25mL glass test tube, 1.20g of water is added, and the mixture is uniformly mixed to form 4.00g of absorbent solution with 70.0 mass percent of ethanolamine lactate. Absorption of SO by an absorbent2: immersing the glass test tube in 40 deg.C water bath to simulate Smoke (SO)2Volume content 2%, N2Volume content 98%) in 100cm3The mixture was bubbled into the glass tube at a rate of/min, and the absorption temperature was 40 ℃. Measuring SO absorbed by absorbent by iodometry after saturation2In an amount of 0.3103g, calculated to give SO as a pair of absorbent2Has an absorption amount of 0.078gSO2Per gram of absorbent. Regeneration of the absorbent: 3.47g of absorption liquid (containing 0.25g of SO) was sucked2) Placing the mixture in a 25ml reaction kettle, and introducing H2S gas 1.1MPa (H)2S and SO2With a molar ratio of 2.7:1), placing the reaction kettle into a heating and stirring device, heating to 40 ℃, and starting magnetic stirring. After 4 hours of reaction, the pressure of the reaction kettle is not changed any more, the reaction kettle is cooled and decompressed to terminate the reaction, the mixture in the reaction kettle is filtered, washed and dried to obtain 0.2813g of solid elemental sulfur, and the generation amount of the solid elemental sulfur is determined according to the absorbed SO2Calculated to yield an elemental sulphur yield of 75%.
Example 8
Preparation of the absorbent: ethanolamine lactate ([ MEA ] was weighed]L)2.00g of the mixed solution is placed in a 25mL glass test tube, 1.01g of ethylene glycol and 0.99g of water are added, and the mixture is uniformly mixed to form 4.00g of absorbent solution with 50.0 mass percent of ethanolamine lactate. Absorption of SO by an absorbent2: immersing the glass test tube in 40 deg.C water bath to simulate Smoke (SO)2The content by volume is 2 percent,N2volume content 98%) in 100cm3The mixture was bubbled into the glass tube at a rate of/min, and the absorption temperature was 40 ℃. Measuring SO absorbed by absorbent by iodometry after saturation2In an amount of 0.3243g, calculated to give SO as a pair of absorbent2Has an absorption amount of 0.081gSO2Per gram of absorbent. Regeneration of the absorbent: 3.33g of absorption liquid (containing 0.25g of SO) was sucked2) Placing the mixture in a 25ml reaction kettle, and introducing H2S gas 1.1MPa (H)2S and SO2With a molar ratio of 2.7:1), placing the reaction kettle into a heating and stirring device, heating to 40 ℃, and starting magnetic stirring. After reacting for 3h, the pressure of the reaction kettle is not changed any more, the reaction kettle is cooled and decompressed to stop the reaction, the mixture in the reaction kettle is filtered, washed and dried to obtain 0.3263g of solid elemental sulfur, and the generation amount of the solid elemental sulfur is determined according to the absorbed SO2Calculated to yield an elemental sulphur yield of 87%.
Example 9
Preparation of the absorbent: ethanolamine lactate ([ MEA ] was weighed]L)2.01g of the mixture is placed in a 25mL glass test tube, 2.01g of ethylene glycol is added, and the mixture is uniformly mixed to form 4.02g of absorbent solution with 50.0 mass percent of ethanolamine lactate. Absorption of SO by an absorbent2: immersing the glass test tube in water bath at 20 deg.C, and simulating Smoke (SO)2Volume content 2%, N2Volume content 98%) in 100cm3The mixture was bubbled into the glass tube at a rate of/min, and the absorption temperature was 20 ℃. Measuring SO absorbed by absorbent by gravimetric method after saturation2In an amount of 0.4743g, calculated to give SO as a pair of absorbent2Has an absorption amount of 0.118gSO2Per gram of absorbent. Regeneration of the absorbent: 2.36g of the absorbent (containing 0.25g of SO)2) Placing the mixture in a 25ml reaction kettle, and introducing H2S gas 1.1MPa (H)2S and SO2With a molar ratio of 2.7:1), placing the reaction kettle into a heating and stirring device, heating to 40 ℃, and starting magnetic stirring. After reacting for 3h, the pressure of the reaction kettle is not changed any more, the reaction kettle is cooled and decompressed to stop the reaction, the mixture in the reaction kettle is filtered, washed and dried to obtain 0.3608g of solid elemental sulfur, and the generation amount of the solid elemental sulfur is determined according to the absorbed SO2Theoretical generation of simple substanceThe yield of elemental sulphur was calculated to be 96% based on the amount of sulphur.
Example 10
Preparation of the absorbent: ethanolamine lactate ([ MEA ] was weighed]L)2.00g of the mixed solution is placed in a 25mL glass test tube, 2.00g of ethylene glycol is added, and the mixture is uniformly mixed to form 4.00g of absorbent solution with 50.0 mass percent of ethanolamine lactate. Absorption of SO by an absorbent2: immersing the glass test tube in 30 deg.C water bath to simulate Smoke (SO)2Volume content 2%, N2Volume content 98%) in 100cm3The mixture was bubbled into the glass tube at a rate of/min, and the absorption temperature was 30 ℃. Measuring SO absorbed by absorbent by gravimetric method after saturation2In an amount of 0.4248g, calculated to give SO as a pair of absorbent2Has an absorption amount of 0.106gSO2Per gram of absorbent. Regeneration of the absorbent: 2.60g of absorption liquid (containing 0.25g of SO) is sucked2) Placing the mixture in a 25ml reaction kettle, and introducing H2S gas 1.1MPa (H)2S and SO2With a molar ratio of 2.7:1), placing the reaction kettle into a heating and stirring device, heating to 40 ℃, and starting magnetic stirring. After reacting for 3h, the pressure of the reaction kettle is not changed any more, the reaction kettle is cooled and decompressed to stop the reaction, the mixture in the reaction kettle is filtered, washed and dried to obtain 0.3605g of solid elemental sulfur, and the generation amount of the solid elemental sulfur is determined according to the absorbed SO2The yield of elemental sulphur was calculated to be 96% based on the theoretical amount of elemental sulphur generated.
Example 11
Preparation of the absorbent: ethanolamine lactate ([ MEA ] was weighed]L)2.00g of the mixed solution is placed in a 25mL glass test tube, 2.00g of ethylene glycol is added, and the mixture is uniformly mixed to form 4.00g of absorbent solution with 50.0 mass percent of ethanolamine lactate. Absorption of SO by an absorbent2: immersing the glass test tube in 50 deg.C water bath to simulate Smoke (SO)2Volume content 2%, N2Volume content 98%) in 100cm3The mixture was bubbled into the glass tube at a rate of/min, and the absorption temperature was 50 ℃. Measuring SO absorbed by absorbent by gravimetric method after saturation2In an amount of 0.3243g, calculated to give SO as a pair of absorbent2Has an absorption amount of 0.081gSO2Per gram of absorbent. Regeneration of the absorbent: suction deviceYield 3.33g (containing 0.25g SO)2) Placing the mixture in a 25ml reaction kettle, and introducing H2S gas 1.1MPa (H)2S and SO2With a molar ratio of 2.7:1), placing the reaction kettle into a heating and stirring device, heating to 40 ℃, and starting magnetic stirring. After reacting for 3h, the pressure of the reaction kettle is not changed any more, the reaction kettle is cooled and decompressed to stop the reaction, the mixture in the reaction kettle is filtered, washed and dried to obtain 0.3602g of solid elemental sulfur, and the generation amount of the solid elemental sulfur is determined according to the absorbed SO2The yield of elemental sulphur was calculated to be 96% based on the theoretical amount of elemental sulphur generated.
Example 12
Preparation of the absorbent: ethanolamine lactate ([ MEA ] was weighed]L)2.50g of the mixture is placed in a 25mL glass test tube, 2.50g of ethylene glycol is added, and the mixture is uniformly mixed to form 5.00g of absorbent solution with 50.0 mass percent of ethanolamine lactate. Absorption of SO by an absorbent2: immersing the glass test tube in water bath at 60 deg.C, and simulating Smoke (SO)2Volume content 2%, N2Volume content 98%) in 100cm3The mixture was bubbled into the glass tube at a rate of/min, and the absorption temperature was 60 ℃. Measuring SO absorbed by absorbent by gravimetric method after saturation2In an amount of 0.2908g, calculated to give SO pairs2Has an absorption amount of 0.058gSO2Per gram of absorbent. Regeneration of the absorbent: absorbing 4.55g of absorption liquid (containing 0.25g of SO)2) Placing the mixture in a 25ml reaction kettle, and introducing H2S gas 1.1MPa (H)2S and SO2With a molar ratio of 2.7:1), placing the reaction kettle into a heating and stirring device, heating to 40 ℃, and starting magnetic stirring. After reacting for 3h, the pressure of the reaction kettle is not changed any more, the reaction kettle is cooled and decompressed to stop the reaction, the mixture in the reaction kettle is filtered, washed and dried to obtain 0.3605g of solid elemental sulfur, and the generation amount of the solid elemental sulfur is determined according to the absorbed SO2The yield of elemental sulphur was calculated to be 96% based on the theoretical amount of elemental sulphur generated.
Example 13
Preparation of the absorbent: ethanolamine lactate ([ MEA ] was weighed]L)2.00g of the mixed solution is placed in a 25mL glass test tube, 2.00g of glycol is added and mixed evenly to form an absorbent solution with 49.9 percent of ethanolamine lactate mass fraction4.00 g. Absorption of SO by an absorbent2: immersing the glass test tube in 40 deg.C water bath to simulate Smoke (SO)2Volume content 2%, N2Volume content 98%) in 100cm3The mixture was bubbled into the glass tube at a rate of/min, and the absorption temperature was 40 ℃. Measuring SO absorbed by absorbent by gravimetric method after saturation2In an amount of 0.3656g, calculated to give SO as a pair of absorbent2Has an absorption amount of 0.091gSO2Per gram of absorbent. Regeneration of the absorbent: 2.99g of the absorption liquid (containing 0.25g of SO) was sucked2) Placing the mixture in a 25ml reaction kettle, and introducing H2S gas 1.1MPa (H)2S and SO2With a molar ratio of 2.7:1), placing the reaction kettle into a heating and stirring device, heating to 30 ℃, and starting magnetic stirring. After 4 hours of reaction, the pressure of the reaction kettle is not changed any more, the reaction kettle is cooled and decompressed to terminate the reaction, the mixture in the reaction kettle is filtered, washed and dried to obtain 0.3638g of solid elemental sulfur, and the generation amount of the solid elemental sulfur is determined according to the absorbed SO2The yield of elemental sulphur was calculated to be 97% based on the theoretical amount of elemental sulphur generated.
Example 14
Preparation of the absorbent: ethanolamine lactate ([ MEA ] was weighed]L)2.00g of the mixed solution is placed in a 25mL glass test tube, 2.01g of ethylene glycol is added, and the mixture is uniformly mixed to form 4.01g of absorbent solution with 49.9 mass percent of ethanolamine lactate. Absorption of SO by an absorbent2: immersing the glass test tube in 40 deg.C water bath to simulate Smoke (SO)2Volume content 2%, N2Volume content 98%) in 100cm3The mixture was bubbled into the glass tube at a rate of/min, and the absorption temperature was 40 ℃. Measuring SO absorbed by absorbent by gravimetric method after saturation2In an amount of 0.3668g, calculated to give SO as a pair of absorbent2Has an absorption amount of 0.091gSO2Per gram of absorbent. Regeneration of the absorbent: 2.98g of the absorbent (containing 0.25g of SO)2) Placing the mixture in a 25ml reaction kettle, and introducing H2S gas 1.1MPa (H)2S and SO2With a molar ratio of 2.7:1), placing the reaction kettle into a heating and stirring device, heating to 50 ℃, and starting magnetic stirring. After the reaction is carried out for 2.5h, the pressure of the reaction kettle is not changed any more, the reaction kettle is cooled and decompressed to stop the reaction, and the reaction is carried outThe mixture in the kettle was filtered, washed and dried to obtain 0.3510g of solid elemental sulfur, depending on the SO absorbed2Calculated to yield an elemental sulphur yield of 94%.
Example 15
Preparation of the absorbent: ethanolamine lactate ([ MEA ] was weighed]L)2.00g of the mixed solution is placed in a 25mL glass test tube, 2.00g of ethylene glycol is added, and the mixture is uniformly mixed to form 4.00g of absorbent solution with 49.9 mass percent of ethanolamine lactate. Absorption of SO by an absorbent2: immersing the glass test tube in 40 deg.C water bath to simulate Smoke (SO)2Volume content 2%, N2Volume content 98%) in 100cm3The mixture was bubbled into the glass tube at a rate of/min, and the absorption temperature was 40 ℃. Measuring SO absorbed by absorbent by gravimetric method after saturation2In an amount of 0.3656g, calculated to give SO as a pair of absorbent2Has an absorption amount of 0.091gSO2Per gram of absorbent. Regeneration of the absorbent: 2.99g of the absorption liquid (containing 0.25g of SO) was sucked2) Placing the mixture in a 25ml reaction kettle, and introducing H2S gas 1.1MPa (H)2S and SO2With a molar ratio of 2.7:1), placing the reaction kettle into a heating and stirring device, heating to 60 ℃, and starting magnetic stirring. After reacting for 2h, the pressure of the reaction kettle is not changed any more, the reaction kettle is cooled and decompressed to stop the reaction, the mixture in the reaction kettle is filtered, washed and dried to obtain the solid elemental sulfur with the generation amount of 0.3450g according to the absorbed SO2Calculated to yield an elemental sulphur yield of 92%.
Example 16
Preparation of the absorbent: ethanolamine lactate ([ MEA ] was weighed]L)2.00g of the mixed solution is placed in a 25mL glass test tube, 2.00g of ethylene glycol is added, and the mixture is uniformly mixed to form 4.00g of absorbent solution with 50.0 mass percent of ethanolamine lactate. Absorption of SO by an absorbent2: immersing the glass test tube in 40 deg.C water bath to simulate Smoke (SO)2Volume content 2%, N2Volume content 98%) in 100cm3The mixture was bubbled into the glass tube at a rate of/min, and the absorption temperature was 40 ℃. Measuring SO absorbed by absorbent by gravimetric method after saturation2In an amount of 0.3656g, calculated to give SO as a pair of absorbent2Has an absorption amount of 0.091gSO2Per gram of absorbent. Regeneration of the absorbent: 2.99g of the absorption liquid (containing 0.25g of SO) was sucked2) Placing the mixture in a 25ml reaction kettle, and introducing H2S gas 0.9MPa (H)2S and SO2The molar ratio of (1) to (2.2), placing the reaction kettle into a heating and stirring device, heating to 40 ℃, and starting magnetic stirring. After reacting for 3h, the pressure of the reaction kettle is not changed any more, the reaction kettle is cooled and decompressed to stop the reaction, the mixture in the reaction kettle is filtered, washed and dried to obtain 0.3533g of solid elemental sulfur, and the generation amount of the solid elemental sulfur is determined according to the absorbed SO2Calculated to yield an elemental sulphur yield of 94%.
Example 17
Preparation of the absorbent: ethanolamine lactate ([ MEA ] was weighed]L)2.00g of the mixed solution is placed in a 25mL glass test tube, 2.01g of ethylene glycol is added, and the mixture is uniformly mixed to form 4.01g of absorbent solution with 49.9 mass percent of ethanolamine lactate. Absorption of SO by an absorbent2: immersing the glass test tube in 40 deg.C water bath to simulate Smoke (SO)2Volume content 2%, N2Volume content 98%) in 100cm3The mixture was bubbled into the glass tube at a rate of/min, and the absorption temperature was 40 ℃. Measuring SO absorbed by absorbent by gravimetric method after saturation2In an amount of 0.3669g, calculated to give SO as a pair of absorbent2Has an absorption amount of 0.092gSO2Per gram of absorbent. Regeneration of the absorbent: 2.98g of the absorbent (containing 0.25g of SO)2) Placing the mixture in a 25ml reaction kettle, and introducing H2S gas 1.0MPa (H)2S and SO2With a molar ratio of 2.46:1), placing the reaction kettle into a heating and stirring device, heating to 40 ℃, and starting magnetic stirring. After reacting for 3h, the pressure of the reaction kettle is not changed any more, the reaction kettle is cooled and decompressed to stop the reaction, the mixture in the reaction kettle is filtered, washed and dried to obtain 0.3585g of solid elemental sulfur, and the generation amount of the solid elemental sulfur is determined according to the absorbed SO2The yield of elemental sulphur was calculated to be 96% based on the theoretical amount of elemental sulphur generated.
Example 18
Preparation of the absorbent: weighing ethanolamine lactic acidSalt ([ MEA)]L)2.00g of the mixed solution is placed in a 25mL glass test tube, 2.00g of ethylene glycol is added, and the mixture is uniformly mixed to form 4.00g of absorbent solution with 50.0 mass percent of ethanolamine lactate. Absorption of SO by an absorbent2: immersing the glass test tube in 40 deg.C water bath to simulate Smoke (SO)2Volume content 2%, N2Volume content 98%) in 100cm3The mixture was bubbled into the glass tube at a rate of/min, and the absorption temperature was 40 ℃. Measuring SO absorbed by absorbent by gravimetric method after saturation2In an amount of 0.3656g, calculated to give SO as a pair of absorbent2Has an absorption amount of 0.091gSO2Per gram of absorbent. Regeneration of the absorbent: 2.99g of the absorption liquid (containing 0.25g of SO) was sucked2) Placing the mixture in a 25ml reaction kettle, and introducing H2S gas 1.2MPa (H)2S and SO2With a molar ratio of 2.9:1), placing the reaction kettle into a heating and stirring device, heating to 40 ℃, and starting magnetic stirring. After reacting for 3h, the pressure of the reaction kettle is not changed any more, the reaction kettle is cooled and decompressed to stop the reaction, the mixture in the reaction kettle is filtered, washed and dried to obtain 0.3614g of solid elemental sulfur, and the generation amount of the solid elemental sulfur is determined according to the absorbed SO2The yield of elemental sulphur was calculated to be 96% based on the theoretical amount of elemental sulphur generated.
Example 19
Preparation of the absorbent: weighing tetramethylguanidine lactate ([ TMG ]]L)2.00g of the mixture is placed in a 25mL glass test tube, 2.00g of ethylene glycol is added, and the mixture is uniformly mixed to form 4.00g of absorbent solution with the mass fraction of the tetramethylguanidine lactate being 50.0 percent. Absorption of SO by an absorbent2: immersing the glass test tube in 40 deg.C water bath to simulate Smoke (SO)2Volume content 2%, N2Volume content 98%) in 100cm3The mixture was bubbled into the glass tube at a rate of/min, and the absorption temperature was 40 ℃. Measuring SO absorbed by absorbent by gravimetric method after saturation2In an amount of 0.4432g, calculated to give SO as a pair of absorbent2Has an absorption amount of 0.111gSO2Per gram of absorbent. Regeneration of the absorbent: 2.5g of the absorbent (containing 0.25g of SO)2) Placing the mixture in a 25ml reaction kettle, and introducing H2S gas 1.1MPa (H)2S and SO2In a molar ratio of 2.7:1) is added into the reaction kettleHeating the stirring device, heating to 40 ℃, and starting magnetic stirring. After reacting for 2h, the pressure of the reaction kettle is not changed any more, the reaction kettle is cooled and decompressed to stop the reaction, the mixture in the reaction kettle is filtered, washed and dried to obtain 0.3443g of solid elemental sulfur, and the generation amount of the solid elemental sulfur is determined according to the absorbed SO2Calculated to yield an elemental sulphur yield of 92%.
Example 20
Preparation of the absorbent: 1-butyl-3-methylimidazolium lactate ([ Bmim) was weighed]L)2.00g of the mixed solution is placed in a 25mL glass test tube, 2.00g of ethylene glycol is added and mixed evenly to form 4.00g of absorbent solution with the mass fraction of the 1-butyl-3-methylimidazole lactate being 50.0 percent. Absorption of SO by an absorbent2: immersing the glass test tube in 40 deg.C water bath to simulate Smoke (SO)2Volume content 2%, N2Volume content 98%) in 100cm3The mixture was bubbled into the glass tube at a rate of/min, and the absorption temperature was 40 ℃. Measuring SO absorbed by absorbent by gravimetric method after saturation2In an amount of 0.4843g, calculated to give SO as a pair of absorbent2Has an absorption amount of 0.121gSO2Per gram of absorbent. Regeneration of the absorbent: 2.31g of the absorbent solution (containing 0.25g of SO) was sucked2) Placing the mixture in a 25ml reaction kettle, and introducing H2S gas 1.1MPa (H)2S and SO2With a molar ratio of 2.7:1), placing the reaction kettle into a heating and stirring device, heating to 40 ℃, and starting magnetic stirring. After reacting for 2h, the pressure of the reaction kettle is not changed any more, the reaction kettle is cooled and decompressed to stop the reaction, the mixture in the reaction kettle is filtered, washed and dried to obtain 0.3439g of solid elemental sulfur, and the generation amount of the solid elemental sulfur is determined according to the absorbed SO2Calculated to yield an elemental sulphur yield of 92%.
Example 21
Preparation of the absorbent: weighing tetraethylammonium lactate ([ N ]2222]L)2.00g of the mixed solution is placed in a 25mL glass test tube, 2.00g of ethylene glycol is added and mixed uniformly to form 4.00g of absorbent solution with 50.0 mass percent of tetraethyl amine lactate. Absorption of SO by an absorbent2: immersing the glass test tube in 40 deg.C water bath to simulate Smoke (SO)2Volume content 2%, N2Volume content 98%) in 100cm3The mixture was bubbled into the glass tube at a rate of/min, and the absorption temperature was 40 ℃. Measuring SO absorbed by absorbent by gravimetric method after saturation2In an amount of 0.5558g, calculated to give SO as a pair of absorbent2Has an absorption amount of 0.139gSO2Per gram of absorbent. Regeneration of the absorbent: 2.05g of absorption liquid (containing 0.25g of SO) is sucked2) Placing the mixture in a 25ml reaction kettle, and introducing H2S gas 1.1MPa (H)2S and SO2With a molar ratio of 2.7:1), placing the reaction kettle into a heating and stirring device, heating to 40 ℃, and starting magnetic stirring. After reacting for 2h, the pressure of the reaction kettle is not changed any more, the reaction kettle is cooled and decompressed to stop the reaction, the mixture in the reaction kettle is filtered, washed and dried to obtain 0.3383g of solid elemental sulfur, and the generation amount of the solid elemental sulfur is determined according to the absorbed SO2Calculated to yield 90% elemental sulphur.
Example 22
Preparation of the absorbent: ethanolamine lactate ([ MEA ] was weighed]L)2.00g of the mixed solution is placed in a 25mL glass test tube, 2.00g of ethylene glycol is added, and the mixture is uniformly mixed to form 4.00g of absorbent solution with 50.0 mass percent of ethanolamine lactate. Absorption of SO by an absorbent2: immersing the glass test tube in 40 deg.C water bath to simulate Smoke (SO)2Volume content 2%, N2Volume content 98%) in 100cm3The mixture was bubbled into the glass tube at a rate of/min, and the absorption temperature was 40 ℃. Measuring SO absorbed by absorbent by gravimetric method after saturation2In an amount of 0.3656g, calculated to give SO as a pair of absorbent2Has an absorption amount of 0.091gSO2Per gram of absorbent. Regeneration of the absorbent: 2.99g of the absorption liquid (containing 0.25g of SO) was sucked2) Placing the mixture in a 25ml reaction kettle, and introducing H2S gas 1.1MPa (H)2S and SO2With a molar ratio of 2.7:1), placing the reaction kettle into a heating and stirring device, heating to 40 ℃, and starting magnetic stirring. After reacting for 3h, the pressure of the reaction kettle is not changed any more, the reaction kettle is cooled and decompressed to stop the reaction, the mixture in the reaction kettle is centrifuged, the absorbent and the solid sulfur are layered, and the absorbent and the sulfur on the upper layer are respectively taken out. Filtering the solid sulfurThe mass after washing and drying was 0.3605g, depending on the SO absorbed2The yield of elemental sulphur was calculated to be 96% based on the theoretical amount of elemental sulphur generated. The absorbent is used for continuously absorbing SO in the simulated flue gas after being dried in vacuum2The absorption and regeneration cycles were carried out 3 times under the above conditions. In three cycles, absorbent is on SO2The absorption amounts of (A) and (B) are respectively: 0.091gSO2Absorbent per gram, 0.092gSO2Absorbent per gram, 0.092gSO2The yield of the elemental sulfur is 96 percent, 96 percent and 95 percent respectively.
Example 23
Preparation of the absorbent: weighing tetramethylguanidine lactate ([ TMG ]]L)2.00g of the mixture is placed in a 25mL glass test tube, 2.00g of ethylene glycol is added, and the mixture is uniformly mixed to form 4.00g of absorbent solution with the mass fraction of the tetramethylguanidine lactate being 50.0 percent. Absorption of SO by an absorbent2: immersing the glass test tube in 40 deg.C water bath to simulate Smoke (SO)2Volume content 2%, N2Volume content 98%) in 100cm3The mixture was bubbled into the glass tube at a rate of/min, and the absorption temperature was 40 ℃. Measuring SO absorbed by absorbent by gravimetric method after saturation2In an amount of 0.4432g, calculated to give SO as a pair of absorbent2Has an absorption amount of 0.111gSO2Per gram of absorbent. Regeneration of the absorbent: 2.50g of the absorbent (containing 0.25g of SO)2) Placing the mixture in a 25ml reaction kettle, and introducing H2S gas 1.1MPa (H)2S and SO2With a molar ratio of 2.7:1), placing the reaction kettle into a heating and stirring device, heating to 40 ℃, and starting magnetic stirring. After reacting for 2h, the pressure of the reaction kettle is not changed any more, the reaction kettle is cooled and decompressed to stop the reaction, the mixture in the reaction kettle is centrifuged, the absorbent and the solid sulfur are layered, and the absorbent and the sulfur on the upper layer are respectively taken out. The solid sulfur was filtered and washed, and the dried mass was 0.3443g according to the SO absorbed2Calculated to yield an elemental sulphur yield of 92%. The absorbent is used for continuously absorbing SO in the simulated flue gas after being dried in vacuum2The absorption and regeneration cycles were carried out 3 times under the above conditions. In three cycles, absorbent is on SO2The absorption amounts of (A) and (B) are respectively: 0.111gSO2/gAbsorbent, 0.109gSO2Absorbent per gram, 0.110gSO2The yields of elemental sulfur per gram of absorbent were 92%, 93%, and 92%, respectively.
Example 24
Preparation of the absorbent: 1-butyl-3-methylimidazolium lactate ([ Bmim) was weighed]L)2.00g of the mixed solution is placed in a 25mL glass test tube, 2.00g of ethylene glycol is added and mixed evenly to form 4.00g of absorbent solution with the mass fraction of the 1-butyl-3-methylimidazole lactate being 50.0 percent. Absorption of SO by an absorbent2: immersing the glass test tube in 40 deg.C water bath to simulate Smoke (SO)2Volume content 2%, N2Volume content 98%) in 100cm3The mixture was bubbled into the glass tube at a rate of/min, and the absorption temperature was 40 ℃. Measuring SO absorbed by absorbent by gravimetric method after saturation2In an amount of 0.4843g, calculated to give SO as a pair of absorbent2Has an absorption amount of 0.121gSO2Per gram of absorbent. Regeneration of the absorbent: 2.31g of the absorbent solution (containing 0.25g of SO) was sucked2) Placing the mixture in a 25ml reaction kettle, and introducing H2S gas 1.1MPa (H)2S and SO2With a molar ratio of 2.7:1), placing the reaction kettle into a heating and stirring device, heating to 40 ℃, and starting magnetic stirring. After reacting for 2h, the pressure of the reaction kettle is not changed any more, the reaction kettle is cooled and decompressed to stop the reaction, the mixture in the reaction kettle is centrifuged, the absorbent and the solid sulfur are layered, and the absorbent and the sulfur on the upper layer are respectively taken out. The solid sulfur was filtered and washed, and the dried mass was 0.3439g according to the SO absorbed2Calculated to yield an elemental sulphur yield of 92%. The absorbent is used for continuously absorbing SO in the simulated flue gas after being dried in vacuum2The absorption and regeneration cycles were carried out 3 times under the above conditions. In three cycles, absorbent is on SO2The absorption amounts of (A) and (B) are respectively: 0.121gSO2Absorbent per gram, 0.120gSO2Absorbent per gram, 0.120gSO2The yields of elemental sulfur per gram of absorbent were 92%, 91%, and 91%, respectively.
Example 25
Preparation of the absorbent: weighing tetraethylammonium lactate ([ N ]2222]L)2.00g of the mixture was placed in a 25mL glass test tube, 2.00g of ethylene glycol was added thereto, and the mixture was mixedThe mixture is uniform, and 4.00g of absorbent solution with the mass fraction of tetraethyl amine lactate of 50.0 percent is formed. Absorption of SO by an absorbent2: immersing the glass test tube in 40 deg.C water bath to simulate Smoke (SO)2Volume content 2%, N2Volume content 98%) in 100cm3The mixture was bubbled into the glass tube at a rate of/min, and the absorption temperature was 40 ℃. Measuring SO absorbed by absorbent by gravimetric method after saturation2In an amount of 0.5558g, calculated to give SO as a pair of absorbent2Has an absorption amount of 0.139gSO2Per gram of absorbent. Regeneration of the absorbent: 2.05g of absorption liquid (containing 0.25g of SO) is sucked2) Placing the mixture in a 25ml reaction kettle, and introducing H2S gas 1.1MPa (H)2S and SO2With a molar ratio of 2.7:1), placing the reaction kettle into a heating and stirring device, heating to 40 ℃, and starting magnetic stirring. After reacting for 2h, the pressure of the reaction kettle is not changed any more, the reaction kettle is cooled and decompressed to stop the reaction, the mixture in the reaction kettle is centrifuged, the absorbent and the solid sulfur are layered, and the absorbent and the sulfur on the upper layer are respectively taken out. The solid sulfur was filtered and washed, and the dried mass was 0.3383g according to the SO absorbed2Calculated to yield 90% elemental sulphur. The absorbent is used for continuously absorbing SO in the simulated flue gas after being dried in vacuum2The absorption and regeneration cycles were carried out 3 times under the above conditions. In three cycles, absorbent is on SO2The absorption amounts of (A) and (B) are respectively: 0.139gSO2Absorbent per gram, 0.137gSO2Absorbent per gram, 0.138gSO2The yield of the elemental sulfur is 90 percent, 89 percent and 90 percent respectively per gram of the absorbent.
Claims (6)
1. Method for absorbing sulfur dioxide (SO) in flue gas by using functionalized ionic liquid2) And a process for low temperature regeneration using a Claus reaction, the process comprising the steps of:
(1) mixing the functionalized ionic liquid with a solvent to prepare a low-viscosity absorbent;
(2) absorbing low-concentration SO in the flue gas by using the absorbent in the step (1)2Gas to obtain a gas containing SO2The absorbent of (4);
(3) will be described in detail(2) Obtained in (1) contains SO2The absorbent is transferred into a reaction kettle, and H is introduced2S gas, under the stirring condition, the catalytic action of the functionalized ionic liquid is utilized to promote H2S and SO2Performing a Claus reaction to generate solid sulfur, and filtering to obtain a solid sulfur product and a filtrate;
(4) carrying out reduced pressure distillation on the filtrate obtained in the step (3), and removing water generated in the step (3) due to the Claus reaction to obtain a regenerated absorbent;
wherein the functionalized ionic liquid is selected from ethanolamine lactate, tetramethylguanidine lactate, tetraethylammonium lactate and 1-butyl-3-methylimidazole lactate.
2. The method according to claim 1, wherein the solvent is selected from one or both of ethylene glycol and water.
3. The method according to claim 1, wherein the mass fraction of the functionalized ionic liquid in the constituent absorbent is 30 to 70%.
4. The method of claim 1, wherein the SO of step (2)2The absorption temperature is 20-60 ℃.
5. The method of claim 1, wherein the introducing H in step (3)2The pressure of S gas is 0.9-1.2 MPa, and H2S and SO in absorbent2The molar ratio of (A) to (B) is 2.2:1 to 2.9: 1.
6. The method of claim 1, wherein H is the same as H in step (3)2S and SO2The temperature at which the claus reaction takes place is between 30 ℃ and 60 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910209324.9A CN109876601B (en) | 2019-03-19 | 2019-03-19 | Process method for absorbing sulfur dioxide in flue gas by functionalized ionic liquid and regenerating by Claus reaction at low temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910209324.9A CN109876601B (en) | 2019-03-19 | 2019-03-19 | Process method for absorbing sulfur dioxide in flue gas by functionalized ionic liquid and regenerating by Claus reaction at low temperature |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109876601A CN109876601A (en) | 2019-06-14 |
| CN109876601B true CN109876601B (en) | 2020-10-02 |
Family
ID=66933052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910209324.9A Active CN109876601B (en) | 2019-03-19 | 2019-03-19 | Process method for absorbing sulfur dioxide in flue gas by functionalized ionic liquid and regenerating by Claus reaction at low temperature |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109876601B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110585860A (en) * | 2019-08-22 | 2019-12-20 | 太原师范学院 | Low-energy-consumption regenerated absorbent and method for absorbing sulfur dioxide in flue gas by using same |
| CN110756002A (en) * | 2019-10-23 | 2020-02-07 | 中国石油化工股份有限公司 | Absorption liquid and method for recovering sulfur from gas containing hydrogen sulfide and sulfur dioxide |
| CN114432842A (en) * | 2020-10-20 | 2022-05-06 | 中国石油化工股份有限公司 | Method and device for coupling desulfurization and preparing sulfur |
| CN114432841A (en) * | 2020-10-20 | 2022-05-06 | 中国石油化工股份有限公司 | Absorption of low concentration SO2Bifunctional absorbent for catalyzing Claus reaction and preparation thereof |
| CN113120866B (en) * | 2021-03-31 | 2022-04-22 | 中南大学 | Method for preparing elemental sulfur by using sulfur dioxide |
| CN113861081B (en) * | 2021-10-25 | 2023-12-19 | 中国药科大学 | Guanidine-functionalized ionic liquid and preparation method and application thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102068876A (en) * | 2009-11-20 | 2011-05-25 | 北京化工大学 | Flue gas desulfurization process |
| CN105521696B (en) * | 2015-11-26 | 2018-01-23 | 南京大学 | A kind of normal temperature liquid phase Claus techniques using ionic liquid as medium |
| CN107281898A (en) * | 2016-03-31 | 2017-10-24 | 北京化工大学 | A kind of alkali metal lactate aqueous solution sulfur dioxide absorption and the process of regeneration |
| CN108910830A (en) * | 2018-08-07 | 2018-11-30 | 中国恩菲工程技术有限公司 | The method for preparing sulphur using the sulfur dioxide in flue gas |
-
2019
- 2019-03-19 CN CN201910209324.9A patent/CN109876601B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109876601A (en) | 2019-06-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109876601B (en) | Process method for absorbing sulfur dioxide in flue gas by functionalized ionic liquid and regenerating by Claus reaction at low temperature | |
| US3864460A (en) | Method for removing hydrogen sulfide from hydrocarbon gas streams without pollution of the atmosphere | |
| CN109499334B (en) | Efficient trapping and separating H2S and CO2And resource utilization method | |
| CN107670464A (en) | A kind of process regenerated with eutectic solvent absorbing sulfur dioxide in flue and use hydrogen sulfide | |
| CN104093475A (en) | Method and absorption medium for absorbing CO2 from a gas mixture | |
| CN1748840A (en) | Process for purifying gases | |
| CN103059024B (en) | Functionalized ion liquid and application thereof | |
| CN114229852B (en) | SO in flue gas is removed by utilizing steel slag 2 Method for synergistically extracting silica gel | |
| CN103908872B (en) | A kind of absorbent and recovery method reclaiming sulfur dioxide from industrial waste gas | |
| CN102941008B (en) | Method for absorbing SO2 by soluble calcium saline solution and regenerating absorbent | |
| CN113019107A (en) | Method for oxidizing hydrogen sulfide and removing carbon dioxide by iron-based ionic liquid wet method | |
| CN106000354A (en) | Preparation method of methyl tertiary butyl ether desulfurization adsorbent | |
| CN1052430C (en) | Polyamine process for removing carbon dioxide and sulphide from gas | |
| CN113101782B (en) | Functionalized ionic liquid absorption liquid and preparation method and application thereof | |
| CN112107967B (en) | Organic amine desulfurization solution and production method and application thereof | |
| CN111943858B (en) | Functionalized ionic liquid with anions containing carboxyl and sulfhydryl functional groups, and preparation method and application thereof | |
| CN107376586A (en) | A kind of effective ways of coal-fired flue gas desulfurization decarburization | |
| CN103447002A (en) | Active carbon modification method for removing hydrocyanic acid | |
| CN103752135A (en) | Tail gas purification method for carbon black plant | |
| CN108325541B (en) | System and method for activating catalyst for calcium carbide PVC resin production | |
| KR101415844B1 (en) | A hydrophobic and ionic liquid based absorbentfor sulphur dioxide and sulfurous acid | |
| CN108178125B (en) | Method for removing CO in biological hydrogen alkane gas by using two-phase absorbent prepared from ethylenediamine and DMA2Method (2) | |
| CN112473742A (en) | Desulfurization catalyst for simultaneously removing hydrogen sulfide and carbonyl sulfide and preparation method thereof | |
| CN111013333A (en) | Method for treating hydrogen sulfide in waste gas generated in viscose fiber production | |
| CN113735786B (en) | Multi-site triazole ionic liquid capable of efficiently and reversibly absorbing ammonia gas |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |