CN103752182A - Ethyl cellulose pervaporation gasoline desulfurization film and preparation method thereof - Google Patents
Ethyl cellulose pervaporation gasoline desulfurization film and preparation method thereof Download PDFInfo
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- CN103752182A CN103752182A CN201410024675.XA CN201410024675A CN103752182A CN 103752182 A CN103752182 A CN 103752182A CN 201410024675 A CN201410024675 A CN 201410024675A CN 103752182 A CN103752182 A CN 103752182A
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Abstract
The invention belongs to the field of material processing, and particularly relates to an ethyl cellulose pervaporation gasoline desulfurization film and a preparation method thereof. The ethyl cellulose pervaporation gasoline desulfurization film is prepared from an active layer and a bottom film in a compounding manner, wherein the active layer is a C60-doped ethyl cellulose film; the bottom film is a polyvinylidene fluoride film; the active layer is coated on the bottom film to prepare an ethyl cellulose pervaporation gasoline desulfurization complex film. The ethyl cellulose pervaporation gasoline desulfurization film has the beneficial effects that C60 can be subjected to charge transfer complexing with a gasoline component with high electron cloud density, large electron affinity is displayed to be applicable to desulfurization; the C60-doped ethyl cellulose complex film has high permeation flux and selectivity on the gasoline component. Thus, the separation performance is effectively improved, the electron affinity of a C60 cluster can be increased after annealing treatment of a solvent, and the permeation rate of the simulated gasoline component in the film is increased, namely the permeation flux is increased.
Description
Technical field
The invention belongs to material processing field, particularly, relate to a kind of ethyl cellulose permeable vaporized gasoline desulphurization membrane and preparation method thereof, utilize ethyl cellulose and C60 hydridization blending and modifying to prepare complex film for gasoline desulfurization.
Background technology
The contained organic sulfur of vehicle fuel oil is one of main pollution sources, reduce atmosphere pollution, produces clean gasoline, and the sulfur content lowering in gasoline is a key.Along with the increasingly stringent of countries in the world to the pay attention to day by day of environmental protection and environmental regulation, production low-sulfur even sweet gasoline has become a kind of development trend.
External gasoline is generally from techniques such as fluid catalytic cracking (fluid catalytic cracking, FCC) (34%), catalytic reforming (33%), alkylation, isomerization and etherificates (approximately 33%); And the gasoline of China approximately 80% carrys out catalytic cracking, because 85%～95% sulphur in gasoline is from catalytically cracked gasoline, this makes the sulfur content in gasoline product more much larger than external gasoline.Therefore the key that reduces product gasoline sulfur content is to reduce the sulfur content of catalytically cracked gasoline.Sulfide existence form in China FCC gasoline be take these four kinds of organic sulfur compounds of mercaptan, thioether, disulphide and thiophene-based as main, wherein the mass concentration of thiophene sulphur accounts for the more than 60% of total sulfur mass concentration, and the mass concentration of thioether sulphur and thiophenic sulfur accounts for the more than 85% of total sulfur.Therefore, the desulfur technology of catalytic gasoline and process exploitation mainly be take and are removed this two classes organic sulfur as main.
At present, industrial technology maturation be hydrodesulfurization, and hydrodesulfurization meeting reduces octane number.Pervaporation membrane desulfurization is to utilize fine and close high-polymer membrane gasoline component to be dissolved to the difference of diffusion, realizes a kind of membrane process that sulfide removes.Have loss of octane number less, investment cost is low, component design simply, easily operation, do not need high temperature, high pressure, the advantages such as cleanliness without any pollution, are a kind of very competitive non-hydrogasoline desulfur technologies.
By the system of selection of membrane material solubility parameter, current permeable vaporized gasoline desulphurization membrane material used mostly is dimethyl silicone polymer (PDMS), polyimides (PI), polyvinylpyrrolidone (PVP), polyureas/ammonia ester (PUU) and hybrid organic-inorganic film etc.The advantages such as it is heat-resisting, corrosion-resistant, anti-oxidant that PDMS has, but its intensity is low; PI contains rigidity aromatic ring structure, and under normal temperature, in glassy state, chemical stability and mechanical property are good; PVP has hydrophily, and good solvent is many, have strong expansion character and with the complexing power of many kinds of substance.But PI fine solvent is few, PVP segment compliance is poor, the surperficial easy formation crackle of film.PU is synthetic more difficult, and film forming condition is harsh.Therefore these 3 kinds of polymer are all difficult for masking, and application is subject to certain limitation.Ethyl cellulose is a kind of application polymer film sulfur removal material more widely, has the advantages such as high selectivity after having sufficient resource, relatively cheap price, simple filming technology, good filming performance and film forming.
Summary of the invention
For overcoming the defect of prior art, the invention provides a kind of C60 of doping and improve ethyl cellulose complex film for gasoline desulfurization by pervaporation with low cost of separating property and preparation method thereof.
For achieving the above object, the present invention adopts following proposal:
Ethyl cellulose permeable vaporized gasoline desulphurization membrane, is composited by active layer and counterdie, and active layer is the ethyl cellulose of doping C60, and its thickness is 30-50 μ m; Counterdie is Kynoar (PVDF) film, and the thickness of counterdie is 90-110 μ m, and Kynoar (PVDF) film has stronger hydrophobic performance, is the desirable supporter of osmosis vaporizing compound membrane material; Active layer is filmed and on counterdie, is made ethyl cellulose complex film for gasoline desulfurization by pervaporation.
The preparation method of above-mentioned ethyl cellulose permeable vaporized gasoline desulphurization membrane, comprises the following steps:
(1) Kynoar, Macrogol 2000,1-METHYLPYRROLIDONE are stirred 24 hours for 1:0.1-0.5:6-10 puts into 50 ℃ of waters bath with thermostatic control of round-bottomed flask in mass ratio, solution is glassy yellow, then carries out press filtration, degassed; Knifing on nonwoven, immerses in deionized water two days, puts into oven drying, obtains the polyvinylidene fluoride film that thickness is 90-110 μ m, and polyvinylidene fluoride film is the counterdie of ethyl cellulose infiltrating and vaporizing membrane;
(2) ethyl cellulose is standby after 40-60 ℃ of oven drying;
(3) C60 is joined in solvent benzol, the mass ratio of C60 and solvent benzol is 1:1000-1500, and magnetic agitation 12h, is mixed with solution;
(4) ethyl cellulose of being prepared by step (2) and crosslinking agent, initator in mass ratio 1:0.2-0.4:0.05-0.1 join in solution prepared by step (3), and magnetic agitation 12h makes casting solution;
Wherein in ethyl cellulose and step (3), the mass ratio of C60 is 1:0.005, and crosslinking agent is 1,6-hexanediyl ester, and initator is benzophenone;
(5) casting solution in step (4) is filtered with 300 object copper mesh;
(6) standing two days of the casting solution that step (5) filtered is to remove bubble;
(7) the degassed casting solution of step (6) gained is filmed on Kynoar counterdie;
(8) the UV-crosslinked 40min of composite membrane step (7) being obtained;
(9) composite membrane step (8) being obtained is put into deionized water and is carried out exchange of solvent, and obtaining active layer thickness is the ethyl cellulose infiltrating and vaporizing membrane of 30-50 μ m.
In order further to improve the separating property of ethyl cellulose permeable vaporized gasoline desulphurization membrane, preferably, the composite membrane that step (7) is obtained is placed at 60 ℃ of solvent vapo(u)r constant temperature 1h to carry out solvent annealing in process and carries out the UV-crosslinked of step (8) again.
With respect to prior art, the present invention has following beneficial effect:
1, the gasoline component that C60 can be higher with cloud density carries out electric charge Transfer Complexation, shows compared with large electron affinity and is suitable for desulfurization.
2, the ethyl cellulose composite membrane of doping C60 has higher permeation flux and selective to gasoline component, thereby effectively improves separating property.
3, after solvent annealing in process, C60 cluster electron affinity energy increases, and the infiltration rate of analog gasoline component in film increases, and permeation flux increases.
Accompanying drawing explanation
Fig. 1 is the structure chart of ethyl cellulose complex film for gasoline desulfurization by pervaporation; Upper layer film is the ethyl cellulose of doping C60, and C60 molecule moves, and assembles and forms cluster; Lower floor is polyvinylidene fluoride film, and because the exchange of top layer solvent and water is very fast, the hole of formation is less, and the Kong Ze that nexine forms is larger, and Kynoar counterdie is milipore filter.
Fig. 2 is the separating property figure of embodiment 1 composite membrane, transverse and longitudinal be designated as operating temperature (℃), ordinate is respectively two parameters that film properties is evaluated: permeation flux (kg/ (m2h)) and sulfur enrichment factor.Wherein curve be modification ethyl cellulose composite membrane permeation flux with operating temperature variation relation figure, another curve is that modification ethyl cellulose composite membrane sulfur enrichment factor is with operating temperature variation relation figure.
The specific embodiment
Embodiment mono-,
The preparation method of ethyl cellulose permeable vaporized gasoline desulphurization membrane, comprises the following steps:
(1) 60g Kynoar, 9.23g Macrogol 2000,392.3mlN-methyl pyrrolidone are put into 50 ℃ of waters bath with thermostatic control of round-bottomed flask and stirred 24 hours, solution is glassy yellow, then carries out press filtration, degassed.Use knifing machine knifing on nonwoven, the thickness of adjusting scraper is 300 μ m, and the film of scraping is immersed in deionized water two days, puts into oven drying, obtains the polyvinylidene fluoride film of 90-110 μ m, i.e. counterdie;
(2) ethyl cellulose is standby after 40-60 ℃ of oven drying;
(3) 0.04gC60 is joined in 60.68ml solvent benzol, magnetic agitation 12h, is mixed with solution;
(4) take ethyl cellulose 8g and the crosslinking agent (1 in step (2), 6-hexanediyl ester) 1.727g, initator (benzophenone) 0.432g join in solution prepared by step (3), and magnetic agitation 12h makes casting solution;
(5) casting solution in step (4) is filtered with 300 object copper mesh;
(6) standing two days of the casting solution that step (5) filtered is to remove bubble;
(7) the degassed casting solution of step (6) gained is poured on polyvinylidene fluoride film, with cover, has the even knifing of glass bar of copper wire, obtain the ethyl cellulose composite membrane of 30-50 μ m;
(8) by the complete UV-crosslinked 40min of ethyl cellulose composite membrane of step (7) solvent evaporates;
(9) composite membrane step (8) being obtained is put into deionized water and is carried out exchange of solvent, obtains ethyl cellulose permeable vaporized gasoline desulphurization membrane.
Ethyl cellulose permeable vaporized gasoline desulphurization membrane prepared by said method, as shown in Figure 1, is composited by active layer 1 and counterdie 2, and active layer is the ethyl cellulose of doping C60, and thickness is 30-50 μ m; Counterdie is Kynoar (PVDF) film, and the thickness of counterdie is 90-110 μ m, and Kynoar (PVDF) film has stronger hydrophobic performance, is the desirable supporter of osmosis vaporizing compound membrane material; Active layer is filmed and on counterdie, is made ethyl cellulose complex film for gasoline desulfurization by pervaporation.
The ethyl cellulose that is counterdie at Kynoar mutually in, C60 cluster distribution uniform, Stability Analysis of Structures, makes film have better dissolving adsorptivity to thiophene.
The evaluation of the separating property of composite membrane is undertaken by infiltration evaporation device and microcoulomb, take thiophene, toluene, cyclohexene, cyclohexane, normal heptane by volume as 1:300-400:400-500:100-200:750-850 is mixed with sulfur content as the analog gasoline of 300 μ g/g left and right.During 75 ℃ of temperature, permeation flux is 2.32, and sulfur enrichment factor is 4.72.
The separating property of prepared film within the scope of 65～85 ℃ the results are shown in Figure 2.
Embodiment bis-,
Be with the difference of embodiment mono-: the composite membrane that step (7) is obtained is placed at 60 ℃ of solvent vapo(u)r constant temperature 1h to carry out solvent annealing in process and carry out the UV-crosslinked of step (8) again; The solvent adopting is thiophene.
The evaluation of the separating property of composite membrane is with example 1, and the separating property in the time of 75 ℃ is best.Permeation flux is 4.08, and sulfur enrichment factor is 4.30.
Embodiment tri-,
Be with the difference of embodiment mono-: the composite membrane that step (7) is obtained is placed at 60 ℃ of solvent vapo(u)r constant temperature 1h to carry out solvent annealing in process and carry out the UV-crosslinked of step (8) again; The solvent adopting is benzene.
The evaluation of the separating property of composite membrane is with example 1, and the separating property in the time of 75 ℃ is best.Permeation flux is 4.85, and sulfur enrichment factor is 4.35.
Embodiment tetra-,
Be with the difference of embodiment mono-: the composite membrane that step (7) is obtained is placed at 60 ℃ of solvent vapo(u)r constant temperature 1h to carry out solvent annealing in process and carry out the UV-crosslinked of step (8) again; The solvent adopting is cyclohexene.
The evaluation of the separating property of composite membrane is with example 1, and the separating property in the time of 75 ℃ is best.Permeation flux is 5.93, and sulfur enrichment factor is 4.55.
Embodiment five,
Be with the difference of embodiment mono-: the composite membrane that step (7) is obtained is placed at 60 ℃ of solvent vapo(u)r constant temperature 1h to carry out solvent annealing in process and carry out the UV-crosslinked of step (8) again; The solvent adopting is cyclohexane.
The evaluation of the separating property of composite membrane is with example 1, and the separating property in the time of 75 ℃ is best.Permeation flux is 5.17, and sulfur enrichment factor is 4.51.
Embodiment six,
Be with the difference of embodiment mono-: the composite membrane that step (7) is obtained is placed at 60 ℃ of solvent vapo(u)r constant temperature 1h to carry out solvent annealing in process and carry out the UV-crosslinked of step (8) again; The solvent adopting is normal heptane.
The evaluation of the separating property of composite membrane is with example 1, and the separating property in the time of 75 ℃ is best.Permeation flux is 3.41, and sulfur enrichment factor is 4.53.
Claims (6)
1. an ethyl cellulose permeable vaporized gasoline desulphurization membrane, is composited by active layer and counterdie, it is characterized in that: active layer is the ethyl cellulose of doping C60, and counterdie is polyvinylidene fluoride film; Active layer is filmed and on counterdie, is made ethyl cellulose complex film for gasoline desulfurization by pervaporation.
2. ethyl cellulose permeable vaporized gasoline desulphurization membrane according to claim 1, is characterized in that, active layer thickness is 30-50 μ m; The thickness of counterdie is 90-110 μ m.
3. the preparation method of ethyl cellulose permeable vaporized gasoline desulphurization membrane claimed in claim 1, is characterized in that, step is as follows:
(1) Kynoar, Macrogol 2000,1-METHYLPYRROLIDONE are stirred 24 hours for 1:0.1-0.5:6-10 puts into 50 ℃ of waters bath with thermostatic control of round-bottomed flask in mass ratio, solution is glassy yellow, then carries out press filtration, degassed; Knifing on nonwoven, immerses in deionized water two days, puts into oven drying, obtains the polyvinylidene fluoride film that thickness is 90-110 μ m, and polyvinylidene fluoride film is the counterdie of ethyl cellulose infiltrating and vaporizing membrane;
(2) ethyl cellulose is standby after 40-60 ℃ of oven drying;
(3) C60 is joined in solvent benzol, the mass ratio of C60 and solvent benzol is 1:1000-1500, and magnetic agitation 12h, is mixed with solution;
(4) ethyl cellulose of being prepared by step (2) and crosslinking agent, initator in mass ratio 1:0.2-0.4:0.05-0.1 join in solution prepared by step (3), and magnetic agitation 12h makes casting solution;
Wherein in ethyl cellulose and step (3), the mass ratio of C60 is 1:0.005, and crosslinking agent is 1,6-hexanediyl ester, and initator is benzophenone;
(5) casting solution in step (4) is filtered with 300 object copper mesh;
(6) standing two days of the casting solution that step (5) filtered is to remove bubble;
(7) the degassed casting solution of step (6) gained is filmed on Kynoar counterdie;
(8) the UV-crosslinked 40min of composite membrane step (7) being obtained;
(9) composite membrane step (8) being obtained is put into deionized water and is carried out exchange of solvent, and obtaining active layer thickness is the ethyl cellulose infiltrating and vaporizing membrane of 30-50 μ m.
4. the preparation method of ethyl cellulose permeable vaporized gasoline desulphurization membrane according to claim 1, is characterized in that: the composite membrane that step (7) is obtained is placed at 60 ℃ of solvent vapo(u)r constant temperature 1h to carry out solvent annealing in process and carry out the UV-crosslinked of step (8) again.
5. according to the preparation method of the ethyl cellulose permeable vaporized gasoline desulphurization membrane described in claim 3-4, it is characterized in that: the solvent adopting is thiophene, benzene, cyclohexene, cyclohexane or normal heptane.
6. the preparation method of ethyl cellulose permeable vaporized gasoline desulphurization membrane claimed in claim 1, is characterized in that, ethyl cellulose infiltrating and vaporizing membrane is for gasoline desulfur.
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| CN109251765A (en) * | 2018-10-31 | 2019-01-22 | 中国石油大学(华东) | Polyurethane/poly-vinylidene-fluoride composite film and preparation method thereof of organic sulfur compound is extracted in a kind of naphtha |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103990389A (en) * | 2014-06-03 | 2014-08-20 | 天津工业大学 | Supramolecular film and manufacturing method thereof |
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| CN106422814A (en) * | 2016-10-28 | 2017-02-22 | 西北大学 | Sodium carboxymethylcellulose pervaporation desulfurization membrane and preparation method thereof |
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| CN106606934A (en) * | 2016-12-02 | 2017-05-03 | 中国石油大学(华东) | Polyurethane pervaporation recovered solvent membrane and preparation method thereof |
| CN109251765A (en) * | 2018-10-31 | 2019-01-22 | 中国石油大学(华东) | Polyurethane/poly-vinylidene-fluoride composite film and preparation method thereof of organic sulfur compound is extracted in a kind of naphtha |
| CN109251765B (en) * | 2018-10-31 | 2020-05-05 | 中国石油大学(华东) | Polyurethane/polyvinylidene fluoride composite membrane for extracting organic sulfide from naphtha and preparation method thereof |
| US11458438B2 (en) | 2018-10-31 | 2022-10-04 | China University Of Petroleum(East China) | Polyurethane/polyvinylidene fluoride composite membrane for extracting organic sulfide from naphtha and preparation method therefor |
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