CN115584287B - Naphthalene dispersant for preparing nano hydrocarbon fuel and application thereof - Google Patents
Naphthalene dispersant for preparing nano hydrocarbon fuel and application thereof Download PDFInfo
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- CN115584287B CN115584287B CN202211167710.4A CN202211167710A CN115584287B CN 115584287 B CN115584287 B CN 115584287B CN 202211167710 A CN202211167710 A CN 202211167710A CN 115584287 B CN115584287 B CN 115584287B
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/10—Liquid carbonaceous fuels containing additives
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Abstract
The application provides a naphthalene dispersant for preparing nano hydrocarbon fuel and application thereof. The naphthalene dispersant comprises naphthalene sulfonate polycondensate, 1-methylimidazole tetrafluoroborate and isooctane. The naphthalene dispersant has good viscosity reducing effect and dispersion performance, and mainly has the effects of increasing the adsorptivity of the coal surface, improving the hydrophilicity, enabling coal particles to be uniformly dispersed in water, having proper viscosity, reducing the particle agglomeration phenomenon of nanoscale materials, improving the fluidity of the nano hydrocarbon fuel and ensuring the stability of the nano hydrocarbon fuel slurry in the neutral state in the storage and transportation processes.
Description
Technical Field
The application relates to the field of environment-friendly fuels, in particular to a naphthalene-based dispersing agent for preparing nano hydrocarbon fuel and application thereof.
Background
The nanometer hydrocarbon fuel is a coal-based fluid fuel with high specific surface area and surface activity, which is a novel and efficient and clean environment-friendly fuel and has the characteristics of high combustion efficiency, low pollutant discharge and the like, and the basic particle size is micro-nanometer level after the coal is subjected to pre-treatment, refinement, nanocrystallization and hydrogen attaching energization by utilizing advanced nanometer crushing technology and equipment. Slurry particles formed by mechanically dispersing the pulverized coal by a nanometer machine set are micro-nano, the specific surface area and the surface energy are large, ultrafine particles can spontaneously aggregate in water to form precipitation or layering, and the apparent viscosity of the slurry is large. The coal particles in the nano hydrocarbon fuel must have a certain particle size and proper particle size distribution, and have good fluidity so as to facilitate storage and transportation. Therefore, a proper amount of dispersing agent is required to be added into the slurry, so that the surfaces of the coal particles are tightly surrounded by dispersing agent molecules and hydration films, the coal particles are uniformly distributed in water, and the fluidity of the nano hydrocarbon fuel is improved.
However, the particle size of the nano hydrocarbon fuel is micro-nano, the surface activity of the ultrafine particles is obviously different from that of the coal water slurry with the common particle size, and the use of the dispersing agent is also obviously different. At present, china mainly researches on the dispersing agent technology of coal water slurry, and the research on the nano hydrocarbon fuel dispersing agent is almost zero.
Disclosure of Invention
The application mainly aims to provide a naphthalene dispersant for preparing nano hydrocarbon fuel and application thereof, so as to solve the problem of poor dispersion performance of the nano hydrocarbon fuel in the prior art.
In order to achieve the above object, according to one aspect of the present application, there is provided a naphthalene-based dispersant for nano hydrocarbon fuel production, the naphthalene-based dispersant comprising naphthalene sulfonate polycondensate, 1-methylimidazole tetrafluoroborate and isooctane.
Further, the naphthalene-based dispersant comprises, by weight: naphthalene sulfonate polycondensate: 15-32 parts of 1-methylimidazole tetrafluoroborate: 8-12 parts of isooctane: 13-17 parts.
Further, the naphthalene sulfonate polycondensate is naphthalene sulfonate formaldehyde condensate potassium salt and/or naphthalene sulfonate formaldehyde condensate sodium salt.
Further, the 1-methylimidazole tetrafluoroborate is 1-methylimidazole tetrafluoroborate potassium salt and/or 1-methylimidazole tetrafluoroborate sodium salt.
According to another aspect of the present application, there is provided a method for preparing nano hydrocarbon fuel pre-slurry, comprising: pre-crushing raw material coal to obtain a pre-crushed raw material; mixing the pre-crushed raw materials, water and the naphthalene dispersant to obtain mixed slurry, and carrying out nano-crushing on the mixed slurry to obtain the nano hydrocarbon fuel pre-slurry.
Further, the addition amount of the naphthalene dispersant is 3.6 to 6.1 per mill based on the solid dry weight of the nano hydrocarbon fuel pre-slurry.
Further, the naphthalene dispersant has naphthalene sulfonate polycondensate in the amount of 1.5-3.2 wt% and 1-methylimidazole tetrafluoroborate in the amount of 0.8-1.2 wt% and isooctane in the amount of 1.3-1.7 wt% based on the dry solid weight of the nano hydrocarbon fuel pre-slurry.
Further, the raw material coal comprises the following components in percentage by weight: 43-48% of carbon, 24-32% of alumina, 23-25% of silicon dioxide, 0.2-0.4% of calcium oxide, 1.5-2.5% of ferric oxide and the balance of impurities.
Further, before the nano-pulverization, the preparation method further comprises the following steps: the mixed slurry is firstly subjected to ultrasonic pretreatment for 5 to 15 minutes, and then is subjected to shearing and emulsifying treatment for 15 to 30 minutes.
Further, the ultrasonic pretreatment equipment is an ultrasonic generator, the power is 0.5-5 kilowatts, and the frequency is 20-80 KHZ; preferably, the shearing and emulsifying treatment equipment is a stirrer, the power is 0.5-5 kilowatts, and the rotating speed is 5000-15000 revolutions per minute.
By applying the technical scheme of the application, the naphthalene dispersant is used in the preparation process of nano hydrocarbon fuel, wherein the molecular structure of naphthalene sulfonate condensate contains hydrophobic naphthalene rings and hydrophilic sulfonic acid groups, the naphthalene sulfonate condensate is an amphiphilic surfactant, one part of hydrophobic groups are adsorbed on the surface of coal particles through electrostatic, hydrophobic action and other acting forces, and the other part of polar hydrophilic groups are exposed outside and extend into water, so that the coal-water relationship is improved, and the coal surface is promotedTension is reduced, and coalescence among coal fines is reduced, so that dispersion fluidity of the nano hydrocarbon fuel slurry is improved. F which can be formed during use of the 1-methylimidazole tetrafluoroborate - Etching the surface dangling bonds of the nanocrystals, thereby playing a role in grinding assistance, so that the nanoscale ultrafine coal powder particles of the application maintain a uniform stability state in water. The isooctane is used as a hydrophobic organic solvent, and can assist naphthalene sulfonate condensate in enhancing the adsorption of naphthalene dispersant on the coal surface and the dispersion in the synthesis process of nano particles, so that the naphthalene dispersant and the coal dust are easily combined. The naphthalene dispersant has good viscosity reducing effect and dispersion performance, and mainly has the effects of increasing the adsorptivity of the coal surface, improving the hydrophilicity, enabling coal particles to be uniformly dispersed in water, having proper viscosity, reducing the particle agglomeration phenomenon of nanoscale materials, improving the fluidity of the nano hydrocarbon fuel and ensuring the stability of the nano hydrocarbon fuel slurry in the neutral state in the storage and transportation processes.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The present application will be described in detail with reference to examples.
It should be noted that, the relationship between the apparent viscosity and the stability of the nano hydrocarbon fuel is different from that of the conventional cognition, and when the material is in a micro-nano state, many physical properties and chemical properties are fundamentally different from those of the material in the conventional state. The particle size of the finished product of the nano hydrocarbon fuel is micro-nano, and because of the large specific surface area of the ultrafine particles, the influence of an electronic effect, a hydroxyl effect, van der Waals force and the like on the particles is increased in geometric coefficient, so that the particles are attracted and extruded with each other, namely, agglomeration phenomenon occurs. It is mainly shown by a further increase in viscosity in the fluid, where gravity has little effect on the fluid. For nano hydrocarbon fuel, the function of adding the dispersing agent is mainly to change the fluidity of the nano hydrocarbon fuel, and the main index for representing the effect of the dispersing agent is apparent viscosity. The inventor has found through a large number of experimental comparison that the nano hydrocarbon fuel has the tendency that the higher the apparent viscosity is, the better the stability is, the lower the apparent viscosity is, the worse the stability is, but the application of the nano hydrocarbon fuel is influenced by the too high viscosity, the too low viscosity can cause the nano hydrocarbon fuel to be settled again under the influence of gravity, therefore, a proper dispersing agent is needed to be used for controlling the viscosity of the nano hydrocarbon fuel in a proper range, and the better viscosity is 280-320 mPa.s, so that the nano hydrocarbon fuel has good dispersion performance and stability on the basis of keeping the characteristics of nano materials.
As described in the background art of the application, the prior art has the problem of poor dispersion performance of nano hydrocarbon fuel. In order to solve the above problems, in an exemplary embodiment of the present application, there is provided a naphthalene dispersant for nano hydrocarbon fuel production, including naphthalene sulfonate polycondensate, 1-methylimidazole tetrafluoroborate and isooctane.
The factors influencing the finished product of nano hydrocarbon fuel have three main points: raw coal quality, slurry solid content and finished product granularity. The dispersion state of the nano hydrocarbon fuel particles is one of the main reasons for influencing the particle size distribution of the slurry, and when the dispersion is more sufficient, the nano hydrocarbon fuel distribution state is more ideal. The naphthalene dispersant of the application uses amphiphilic naphthalene sulfonate condensate (NSF) to improve the coal-water relationship and reduce the coalescence among coal dust, thereby improving the dispersion fluidity of the nano hydrocarbon fuel slurry. 1-methylimidazole tetrafluoroborate ([ Mim)]BF 4 ) Can form F during use - Etching the surface dangling bonds of the nanocrystals to generate silicon tetrafluoride gas to overflow, thereby playing a role in grinding, and ensuring that the nanoscale ultrafine coal powder particles of the application maintain a uniform stability state in water. The isooctane is used as a hydrophobic organic solvent, and can enhance the adsorption of naphthalene dispersing agent to the coal surface, so that the naphthalene dispersing agent and the coal dust are easy to combine.
According to the dispersion requirement of the use condition on the slurry, the application discloses a compound dispersant mainly based on naphthalene, and the compound dispersant combines the production cost and the subsequent utilization of nano hydrocarbon fuel. The compound dispersant not only has the action mechanism of a single dispersant, but also has the characteristic of synergy, has the effect of adding one to be more than two, and ensures that the performance of the nano hydrocarbon fuel is more excellent. The naphthalene dispersant has good viscosity reducing effect and dispersion performance, and mainly has the effects of increasing the adsorptivity of the coal surface, improving the hydrophilicity, enabling coal particles to be uniformly dispersed in water, having proper viscosity, reducing the particle agglomeration phenomenon of nanoscale materials, improving the fluidity of the nano hydrocarbon fuel and ensuring the stability of the nano hydrocarbon fuel slurry in the neutral state in the storage and transportation processes.
The concentration and granularity of the nano hydrocarbon fuel finished product are different, the surface activity and surface energy of the slurry are also obviously different, the apparent viscosity and the thickening coefficient are completely different, and the used dispersing agent is different. The dispersant with the same components has different proportions and different application methods, and can have great influence on the finished product quality of the nano hydrocarbon fuel. In a preferred embodiment, the naphthalene based dispersant comprises, in parts by weight: naphthalene sulfonate polycondensate: 15-32 parts of 1-methylimidazole tetrafluoroborate: 8-12 parts of isooctane: 13-17 parts. The naphthalene dispersant with the composition is more suitable for the preparation process of the nano hydrocarbon fuel, can better exert the synergistic characteristic of three components, ensures that the dispersion effect of the slurry is better, has proper viscosity, and further improves the particle stability of nano materials.
Typically, but not by way of limitation, in the naphthalene based dispersant provided by the present application, the naphthalene sulfonate polycondensate is present in a range of values such as 15 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 25 parts, 26 parts, 28 parts, 30 parts, 32 parts or any two values; the weight parts of the 1-methylimidazole tetrafluoroborate are 8 parts, 9 parts, 10 parts, 11 parts, 12 parts or any two values; the weight parts of isooctane are, for example, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts or any two values.
Naphthalene sulfonate polycondensates may be used with various specific compounds known in the art, in order to provide better hydrophilic and lipophilic action to naphthalene based dispersants, in a preferred embodiment naphthalene sulfonate polycondensates are naphthalene sulfonate formaldehyde condensate potassium salts and/or naphthalene sulfonate formaldehyde condensate sodium salts; preferably, the naphthalene sulfonate polycondensate has a relative molecular weight of 230, which can further promote the reduction of the surface tension of coal and reduce the coalescence among coal fines, thereby enhancing the dispersion fluidity of the nano hydrocarbon fuel slurry.
Meanwhile, in order to further enhance the etching and grinding assisting effect of the 1-methylimidazole tetrafluoroborate, in a preferred embodiment, the 1-methylimidazole tetrafluoroborate is 1-methylimidazole tetrafluoroborate potassium salt and/or 1-methylimidazole tetrafluoroborate sodium salt.
In still another exemplary embodiment of the present application, there is also provided a method for preparing a nano hydrocarbon fuel pre-slurry, wherein the nano hydrocarbon fuel is obtained after the nano hydrocarbon fuel pre-slurry is hydrogen-attached, the method comprising: pre-crushing raw material coal to obtain a pre-crushed raw material; mixing the pre-crushed raw materials, water and the naphthalene dispersant to obtain mixed slurry, and carrying out nano-crushing on the mixed slurry to obtain the nano hydrocarbon fuel pre-slurry. Because the naphthalene dispersant of the application is used, coal particles can be uniformly dispersed in water, and the particle agglomeration phenomenon of nano-scale materials is reduced, so that the nano-scale materials have proper viscosity, the fluidity of nano-hydrocarbon fuel pre-slurry is improved, and the stability of the nano-hydrocarbon fuel pre-slurry in the storage and transportation processes is ensured.
In order to further improve the slurry particle size distribution of the nano hydrocarbon fuel, in a preferred embodiment, the addition amount of the naphthalene-based dispersant is 3.6 to 6.1 per mill based on the dry weight of the solid of the nano hydrocarbon fuel. Wherein, the solid dry weight of the nano hydrocarbon fuel pre-slurry refers to the solid content of the slurry. The inventor finds that when the consumption of each component of the naphthalene dispersant is lower than the above range, the wettability of the surface of the coal particles cannot be obviously improved, the dispersing capability is limited, the agglomeration phenomenon of the coal particles is obvious, and the viscosity is still higher; however, when the amount of each component of the naphthalene-based dispersant is higher than the above range, a large amount of dispersant acts on the surface of the coal particles, and the surface water content is too high, so that an excessively thick hydrated film is formed, which rather hinders the flow of the coal particles. Therefore, when the addition amount of each component of the naphthalene dispersant is limited to be within the above range, the dispersant has better viscosity reducing effect on the dispersion of the nano hydrocarbon fuel.
Typically, but not by way of limitation, the naphthalene dispersant is added in an amount ranging from 3.6%, 4.0%, 4.4%, 4.5%, 5.0%, 5.3%, 5.5%, 6.0%, 6.1% or any two values based on the dry weight of the solid of the nano hydrocarbon fuel.
The interaction of the amphiphilic surface activity of naphthalene sulfonate polycondensate and the etching and grinding assisting effect of 1-methylimidazole tetrafluoroborate is a main action mode of the naphthalene dispersant, and in a preferred embodiment, the naphthalene dispersant is characterized in that the consumption of naphthalene sulfonate polycondensate is 1.5-3.2 wt% and the consumption of 1-methylimidazole tetrafluoroborate is 0.8-1.2 wt% and the consumption of isooctane is 1.3-1.7 wt%, based on the dry weight of the solid of nano hydrocarbon fuel pre-slurry, so that the naphthalene dispersant can further improve the coal-water relationship, reduce the coalescence among coal dust, further enhance the dispersion fluidity of nano hydrocarbon fuel slurry, and ensure that the nano superfine coal dust particles of the application maintain a more uniform stability state in water.
Typically, but not by way of limitation, the naphthalene sulfonate polycondensate is used in an amount of 1.5%, 2.0%, 2.5%, 3.0%, 3.2% by weight or any two values based on the dry weight of the solid of the nano hydrocarbon fuel, and the 1-methylimidazolium tetrafluoroborate is used in an amount of 0.8%, 0.9%, 1.0%, 1.1%, 1.2% or any two values, and the isooctane is used in an amount of 1.3%, 1.4%, 1.5%, 1.6%, 1.7% or any two values.
According to the classification of carbon content, coal is mainly divided into gangue, middling, fine coal, clean coal and the like, and when the carbon content is different and the content of main ash components such as silicon dioxide, aluminum oxide, calcium oxide, ferric oxide and the like is different, the dispersant applicable to the prepared nano hydrocarbon fuel is obviously different. Because the surface activity of the superfine particles is obviously enhanced under the micro-nano state, the agglomeration and sedimentation states generated by the slurries with different components are obviously different. Different types of dispersing agents influence the performance of the nano hydrocarbon fuel to a great extent, obvious matching exists between the dispersing agents and the nano hydrocarbon fuel slurry, one dispersing agent is only applicable to certain slurry meeting the requirements, good dispersing and viscosity reducing effects are achieved on the dispersing agents, and the dispersing effect on the unmatched nano hydrocarbon fuel slurry is very little. Thus, in a preferred embodiment, the feed coal comprises, in weight percent: carbon: 43% -48%, alumina: 24% -32%, silicon dioxide: 23% -25%, calcium oxide: 0.2 to 0.4 percent of ferric oxide: 1.5 to 2.5 percent and the balance of impurities. The dispersant is a compound dispersant based on naphthalene, and the raw material of the powder coal is more suitable for naphthalene dispersant of the application, and the concentration of the obtained nano hydrocarbon fuel finished product is 63-65%, and D50 is less than or equal to 1.0-1.5 mu m.
The naphthalene dispersant is preferably added in a disposable manner, and in a preferred embodiment, the preparation method further comprises, before the nano-pulverization: the mixed slurry is subjected to ultrasonic pretreatment for 5-15 minutes and then subjected to shearing and emulsifying treatment for 15-30 minutes, so that the nano hydrocarbon fuel pre-slurry is dispersed more thoroughly, and the naphthalene dispersant provided by the application is more suitable for playing a dispersing and viscosity reducing effect.
The ultrasonic pretreatment and shearing emulsification treatment equipment is commonly used in the field, in order to further improve the dispersing effect of the naphthalene dispersant on the nano hydrocarbon fuel pre-slurry, the nano hydrocarbon fuel pre-slurry with more uniform slurry particle size distribution is obtained, and in a preferred embodiment, the ultrasonic pretreatment equipment is an ultrasonic generator, the power is 0.5-5 kilowatts, and the frequency is 20-80 KHZ. Preferably, the shearing and emulsifying treatment equipment is a stirrer, the power is 0.5-5 kilowatts, and the rotating speed is 5000-15000 revolutions per minute.
The application is described in further detail below in connection with specific examples which are not to be construed as limiting the scope of the application as claimed.
Example 1
In the embodiment, the nano hydrocarbon fuel is prepared by using the coal powder of the inner Mongolia quaiger mining area as raw coal.
(1) Pre-crushing the raw material of the pulverized coal to obtain a pre-crushed raw material, wherein the specific components of the pulverized coal are 44% of carbon content by weight percent; alumina content 24%; the silicon dioxide content is 24%; the content of calcium oxide is 0.3%; iron oxide content 1.7%, the rest is impurities;
(2) Mixing the pre-crushed raw material with water and naphthalene dispersant, adding the naphthalene dispersant once, performing ultrasonic vibration for 10 minutes to perform pretreatment, and then stirring for 20 minutes in a shearing and emulsifying mode to obtain nano hydrocarbon fuel pre-slurry, wherein the concentration of the finished slurry is 64%, and d50=1.3 mu m. Wherein, based on the solid dry weight of the nano hydrocarbon fuel pre-slurry, the adding amount of the naphthalene dispersant is 5.0 per mill, wherein the naphthalene dispersant comprises 2.5 per mill of naphthalene sulfonic acid formaldehyde condensate potassium salt, 1.0 per mill of 1-methylimidazole tetrafluoroboric acid sodium salt and 1.5 per mill of isooctane. The ultrasonic stirring equipment adopts a 1 kilowatt ultrasonic generator with the frequency of 40KHZ; the shearing emulsification is carried out by adopting a stirrer with the speed of 8000 revolutions per minute.
Examples 2 to 7
Examples 2 to 7 differ from example 1 in the amounts of the components added of the naphthalene-based dispersant, as shown in Table 1.
TABLE 1
Example 8
Example 8 differs from example 1 in that an ultrasonic pretreatment was performed for 15 minutes followed by a shear emulsification treatment for 30 minutes. The power of the ultrasonic treatment is 0.5 kilowatt and the frequency is 80KHZ; the power of the shearing emulsification treatment is 0.5 kilowatt, and the rotating speed is 15000 revolutions/min.
Example 9
Example 9 differs from example 1 in that the ultrasonic pretreatment was performed for 5 minutes and then the shearing emulsification treatment was performed for 15 minutes. The power of ultrasonic treatment is 5 kilowatts, and the frequency is 20KHZ; the power of the shearing emulsification treatment is 5 kilowatts, and the rotating speed is 5000 revolutions per minute.
Comparative example 1
Comparative example 1 differs from example 1 in that the dispersant is only a naphthalene sulfonate polycondensate.
Comparative example 2
Comparative example 2 differs from example 1 in that the dispersant is only 1-methylimidazole tetrafluoroborate.
Comparative example 3
Comparative example 3 differs from example 1 in that the dispersant is only isooctane.
Performance testing of the dispersants of examples 1 to 9 and comparative examples 1 to 3:
(1) According to the fifth part of the GBT18856.5-2008 coal water slurry test method: stability test, the static stability of the nano hydrocarbon fuel is tested after the nano hydrocarbon fuel is kept stand for 10 days. Placing a certain amount of uniform nano hydrocarbon fuel sample into a container, standing for 10d under a specified condition, tilting the container to enable the nano hydrocarbon fuel to flow out freely, vertically inverting the container for 8Min, weighing the mass of residues in the container, and representing the static stability of the nano hydrocarbon fuel by the mass fraction of the residues of the nano hydrocarbon fuel to the nano hydrocarbon fuel sample.
(2) According to the fourth part of GBT18856.5-2008 coal water slurry test method: apparent viscosity test method, test at shear rate of 100s -1 Apparent viscosity of the lower nanometer hydrocarbon fuel. Apparent viscosity using a Hark VT550 rotary viscometer, the average of 10 sets of data recorded at a shear rate of 100s-1 was taken.
The results of performance testing of the dispersants of examples 1 to 9 and comparative examples 1 to 3 are shown in Table 2.
TABLE 2
The experimental results show that compared with the comparative example and the nano hydrocarbon fuel original slurry without the dispersing agent, the slurry with the dispersing agent has good stability after standing for 10 days, and the dispersibility of the slurry is improved, which indicates that the dispersing agent has a certain dispersing effect on the slurry. Experimental results show that compared with the original slurry without the addition, the apparent viscosity of the nano hydrocarbon fuel pre-slurry added with the dispersing agent provided by the application is properly reduced, which proves that the dispersing agent provided by the application has a certain viscosity reducing effect on the nano hydrocarbon fuel slurry.
From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects: the naphthalene dispersant of the application uses amphiphilic naphthalene sulfonate condensate (NSF) to improve the coal-water relationship and reduce the coalescence among coal dust, thereby enhancing the dispersion fluidity of the nano hydrocarbon fuel slurry. 1-methylimidazole tetrafluoroborate ([ Mim)]BF 4 ) The surface dangling bonds of the nano crystals can be etched in the use process, so that the grinding-assisting effect is achieved, and the nano-scale ultrafine coal powder particles can maintain a uniform stability state in water. The isooctane is used as a hydrophobic organic solvent, and can enhance the adsorption of naphthalene dispersing agent to the coal surface, so that the naphthalene dispersing agent and the coal dust are easy to combine. In addition, it can be seen that the dispersing effect of the dispersing agent is better when the content of each component or the process parameters are within the preferred ranges of the present application.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. The naphthalene dispersant for preparing the nano hydrocarbon fuel is characterized by comprising, by weight, 15-32 parts of naphthalene sulfonate polycondensate, 8-12 parts of 1-methylimidazole tetrafluoroborate and 13-17 parts of isooctane.
2. Naphthalene dispersant according to claim 1, wherein the naphthalene sulfonate polycondensate is a naphthalene sulfonate formaldehyde condensate potassium salt and/or naphthalene sulfonate formaldehyde condensate sodium salt.
3. Naphthalene based dispersant according to claim 1 or 2, wherein the 1-methylimidazole tetrafluoroborate is 1-methylimidazole tetrafluoroborate potassium salt and/or 1-methylimidazole tetrafluoroborate sodium salt.
4. The preparation method of the nano hydrocarbon fuel pre-slurry is characterized by comprising the following steps of:
pre-crushing raw material coal to obtain a pre-crushed raw material;
mixing the pre-crushed raw material, water and the naphthalene dispersant according to any one of claims 1 to 3 to obtain mixed slurry, and carrying out nano-crushing on the mixed slurry to obtain the nano hydrocarbon fuel pre-slurry.
5. The preparation method of claim 4, wherein the naphthalene dispersant is added in an amount of 3.6-6.1 per mill based on the dry weight of the nano hydrocarbon fuel pre-slurry.
6. The method according to claim 5, wherein the naphthalene dispersant is used in an amount of 1.5 to 3.2 wt% based on the dry weight of the nano hydrocarbon fuel pre-slurry, the 1-methylimidazole tetrafluoroborate is used in an amount of 0.8 to 1.2 wt% and the isooctane is used in an amount of 1.3 to 1.7 wt%.
7. The method of claim 4, wherein the raw coal comprises, in weight percent: 43-48% of carbon, 24-32% of aluminum oxide, 23-25% of silicon dioxide, 0.2-0.4% of calcium oxide, 1.5-2.5% of ferric oxide and the balance of impurities.
8. The method of preparing according to claim 4, wherein prior to the nano-comminuting, the method of preparing further comprises: and firstly carrying out ultrasonic pretreatment on the mixed slurry for 5-15 minutes, and then carrying out shearing and emulsifying treatment for 15-30 minutes.
9. The method according to claim 8, wherein the ultrasonic pretreatment equipment is an ultrasonic generator, the power is 0.5-5 kw, and the frequency is 20-80 khz.
10. The preparation method of claim 8, wherein the shearing and emulsifying device is a stirrer, the power is 0.5-5 kw, and the rotation speed is 5000-15000 rpm.
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| US8920682B2 (en) * | 2010-03-19 | 2014-12-30 | Eastern Michigan University | Nanoparticle dispersions with ionic liquid-based stabilizers |
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