CN113512448A - Additive composition for coal water slurry - Google Patents
Additive composition for coal water slurry Download PDFInfo
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- CN113512448A CN113512448A CN202110892385.7A CN202110892385A CN113512448A CN 113512448 A CN113512448 A CN 113512448A CN 202110892385 A CN202110892385 A CN 202110892385A CN 113512448 A CN113512448 A CN 113512448A
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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
- C10L1/32—Liquid carbonaceous fuels consisting of coal-oil suspensions or aqueous emulsions or oil emulsions
- C10L1/326—Coal-water suspensions
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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
- C10L1/14—Organic compounds
- C10L1/143—Organic compounds mixtures of organic macromolecular compounds with organic non-macromolecular compounds
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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
- C10L1/14—Organic compounds
- C10L1/18—Organic compounds containing oxygen
- C10L1/192—Macromolecular compounds
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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
- C10L1/14—Organic compounds
- C10L1/24—Organic compounds containing sulfur, selenium and/or tellurium
- C10L1/2431—Organic compounds containing sulfur, selenium and/or tellurium sulfur bond to oxygen, e.g. sulfones, sulfoxides
- C10L1/2437—Sulfonic acids; Derivatives thereof, e.g. sulfonamides, sulfosuccinic acid esters
Abstract
The invention discloses an additive composition for coal water slurry, which comprises polymer sulfonate, naphthalene sulfonate, lignin salt, ultra-high molecular weight polysaccharide and a nonionic surfactant. The invention prepares the polymer sulfonate by urea, greatly reduces the production cost of the additive, and increases the molecular weight to be higher than 1 multiplied by 108The Da ultra-high molecular weight polysaccharide is added into the coal water slurry, so that the viscosity of the coal water slurry is greatly reduced during shearing, the fluidity and the stability of the coal water slurry are improved, the coal water slurry with standard production concentration, low viscosity, outstanding rheological property and good suspension stability is produced, and the requirement of the coal water slurry used in the actual production of coal chemical industry is met.
Description
Technical Field
The invention relates to the field of coal chemical industry, in particular to an additive composition for coal water slurry.
Background
For a long time, China always uses the clean coal development technology as an important technical direction in the advanced energy field of coal chemical industry, the clean coal technology has become an important field of sustainable energy development in China, and the coal water slurry is one of important clean coal technologies. It is a coal-water suspension liquid, also called coal-water slurry, which is formed by mixing coal powder with a certain fineness, water and additives. The coal water slurry for industrial application requires high concentration, low viscosity, good rheological property and good suspension stability.
At present, coal water slurry prepared by adding additives generally has three phenomena: 1. the viscosity is low, the suspension stability is common, but the concentration is low, and the rheological property is poor; 2. the concentration is high, the viscosity is general, but the suspension stability is poor, and the rheological property is very poor; 3. high concentration, stable suspension, high viscosity, poor rheological property and certain defects.
Disclosure of Invention
The invention aims to provide an additive composition for coal water slurry, and the prepared coal water slurry has the characteristics of high concentration, low viscosity, good suspension stability and good rheological property.
The invention is realized by the following steps:
an additive composition for a coal water slurry comprising a polymer sulfonate, a naphthalene sulfonate, a lignin salt, an ultra high molecular weight polysaccharide, and a nonionic surfactant, the polymer sulfonate having the formula:
in the formula (1), M is independently Na or K, and X is independently
Or
And m and n in the structural formula of the polymer sulfonate are integer values in the range of 1 to 100.
The naphthalene sulfonate is one or more of methylene dinaphthalene sodium sulfonate, methylene dinaphthalene potassium sulfonate, methylene dibenzyl sodium naphthalene sulfonate, methylene bisbenzylnaphthalene potassium sulfonate, methylene bisisopropylnaphthalene sodium sulfonate and methylene bisisopropylnaphthalene potassium sulfonate.
The lignin salt is one or more of sodium lignin, potassium lignin, calcium lignin, sodium lignin sulfonate, potassium lignin sulfonate and calcium lignin sulfonate.
The ultra-high molecular weight polysaccharide is one or two of diutan and sodium carboxymethyl cellulose.
The molecular weight of the ultra-high molecular weight polysaccharide is not less than 1 x 108Da。
The nonionic surfactant is one or more of perfluoroalkyl ether polyoxyethylene ether type nonionic fluorocarbon surfactant, perfluoroalkyl ether acrylate type nonionic fluorocarbon surfactant and perfluoroalkyl ether oxa type nonionic surfactant.
The mass percent of the polymer sulfonate is 10-90 wt%, the mass percent of the naphthalene sulfonate is 10-90 wt%, the mass percent of the lignin salt is 10-90 wt%, the mass percent of the ultrahigh molecular weight polysaccharide is 0.01-1 wt%, and the mass percent of the nonionic surfactant is 0.01-1 wt%.
The coal water slurry comprises dry-based coal and a coal water suspension, and the content of the additive composition in the coal water slurry is 0.05-0.5 wt% of the weight of the dry-based coal.
The invention has reasonable structure design, the production cost of the additive is greatly reduced by preparing the polymer sulfonate through urea, and the molecular weight is higher than 1 multiplied by 108The Da ultra-high molecular weight polysaccharide is added into the coal water slurry, so that the viscosity of the coal water slurry is greatly reduced during shearing, the fluidity and the stability of the coal water slurry are improved, and the coal water slurry with standard concentration, low viscosity, outstanding rheological property and good suspension stability is produced.
Drawings
FIG. 1 is a flow diagram of a process for producing a coal water slurry using an additive composition for coal water slurry according to the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
An additive composition for a coal water slurry comprising a polymer sulfonate, a naphthalene sulfonate, a lignin salt, an ultra high molecular weight polysaccharide, and a nonionic surfactant, the polymer sulfonate having the formula:
in the formula (1), M is independently Na or K, and X is independently
Or
And m and n in the structural formula of the polymer sulfonate are integer values in the range of 1 to 100. In this embodiment, the additive composition contains a plurality of amphiphilic molecules, each of which is composed of a hydrophobic group and a hydrophilic group, the surfaces of the coal particles are hydrophobic, and the amphiphilic molecules are bonded to the surfaces of the coal particles through the hydrophobic groups thereof, and water molecules are adsorbed on the surfaces of the coal particles in a manner that the hydrophilic groups are oriented toward water, so that the surfaces of the coal particles are converted from hydrophobic to hydrophilic, and a hydration film is formed on the surfaces of the coal particles. The coal particles are neutral particles, and when the coal particles adsorb amphipathic molecules, the amphipathic molecules become charged particles, the surfaces of the coal particles have the same charge, and electrostatic repulsive force is generated among the coal particles. When the repulsive force is larger than the van der Waals attractive force between the coal particles, the coal particles are prevented from being aggregated and precipitated with each other, and the coal particles are promoted to be stably dispersed in water. The cyclic groups of the polymer sulfonate are adsorbed on the surfaces of the coal particles, the sulfonic acid groups carry very strong charges, and the electrostatic repulsion among the sulfonic acid groups enables the coal particles to be stably dispersed in water. The molecular weight of the naphthalene sulfonate is small and is greatly different from that of the polymer sulfonate. The difference of the molecular weight enables the naphthalenesulfonates and the polymer sulfonates to have complementary action, and the naphthalenesulfonates with small molecular weight can fill up the coal particle surfaces which are not covered by the polymer sulfonates with large molecular weight due to structural obstacle or adsorption shedding, so that the coal particle surfaces can fully adsorb amphiphilic molecules; the molecular weight of the polymer sulfonate is generally 5000-50000 Da, and the polysaccharide molecular chain with ultrahigh molecular weight is longer and is fully extended in a larger range to formThe lignin salt and the polymer sulfonate with small molecular weight are connected to the main crosslinked network in a form similar to grafting, and simultaneously, the lignin salt and/or the polymer sulfonate are also connected with each other due to the interaction between molecules and interpenetrate with the main crosslinked network, so that a complex three-dimensional space network structure can be formed, coal particles are stably suspended in water, and unrecoverable precipitation is not generated.
The naphthalene sulfonate is one or more of methylene dinaphthalene sodium sulfonate, methylene dinaphthalene potassium sulfonate, methylene dibenzyl sodium naphthalene sulfonate, methylene bisbenzylnaphthalene potassium sulfonate, methylene bisisopropylnaphthalene sodium sulfonate and methylene bisisopropylnaphthalene potassium sulfonate. In this embodiment, sodium methylenedinaphthalene sulfonate, potassium methylenedinaphthalene sulfonate, sodium methylenedibenzylnaphthalene sulfonate, potassium methylenebisbenzylnaphthalene sulfonate, sodium methylenebisisopropylnaphthalene sulfonate, and potassium methylenebisisopropylnaphthalene sulfonate are all dispersants, and have the advantages of good grinding efficiency, dispersibility, heat resistance, and high-temperature dispersion stability, and are easily soluble in water of any hardness, and have excellent diffusibility and protective colloid performance.
The lignin salt is one or more of sodium lignin, potassium lignin, calcium lignin, sodium lignin sulfonate, potassium lignin sulfonate and calcium lignin sulfonate. In the embodiment, the lignin salt is a natural high molecular polymer with second content to cellulose and chitin in nature, and one of the most extensive uses is that the lignin salt is converted into the lignin sulfonate through sulfonation modification, is easy to dissolve in water and alkali liquor, is precipitated when meeting acid, and has strong dispersing capacity; after the lignin salt is ionized in water, a group with a strong electric charge is formed, and the coal particles can be promoted to be dispersed in the water. The surfactant can form a layer of hydrated film on the surface of the coal particles to separate the coal particles and prevent the coal particles from aggregating with each other.
The ultra-high molecular weight polysaccharide is one or two of diutan and sodium carboxymethyl cellulose. In the embodiment, the diutan is a novel microbial polysaccharide after xanthan gum, gellan gum and welan gum, is a water-soluble biopolymer generated by microbial fermentation, has excellent properties of thickening property, pseudoplasticity, high temperature resistance, high salt resistance, wide pH adaptability and the like, can be widely applied to industries such as petroleum, building materials and the like, and has a wide application prospect; sodium carboxymethylcellulose is an organic matter, is a carboxymethylated derivative of cellulose, is the most main ionic cellulose gum, is easy to disperse in water to form a transparent colloidal solution, is one of thickening agents, has certain thickening and emulsifying effects and certain gelling effects, and is beneficial to better forming gel for food.
The molecular weight of the ultra-high molecular weight polysaccharide is not less than 1 x 108Da. In the embodiment, the molecular chain of the ultra-high molecular weight polysaccharide is very long, and can bridge between two or/and a plurality of coal particles, so that on one hand, the coal particles can be effectively prevented from precipitating, on the other hand, the frictional resistance between the particles can be reduced, once the particles start to flow under the shearing action of an external force, the frictional resistance is rapidly reduced, the shearing rate is higher, the fluid viscosity is lower, and under the condition of the same initial viscosity, compared with the common molecular weight polysaccharide, when the polysaccharide molecular weight exceeds 1 × 108When Da is needed, the shear viscosity of the prepared coal water slurry is reduced by more than 50%.
The nonionic surfactant is one or more of perfluoroalkyl ether polyoxyethylene ether type nonionic fluorocarbon surfactant, perfluoroalkyl ether acrylate type nonionic fluorocarbon surfactant and perfluoroalkyl ether oxa type nonionic surfactant. In the present embodiment, the nonionic fluorine surfactant is a surfactant in which all or part of hydrogen atoms in a hydrocarbon chain in the nonionic surfactant are substituted with fluorine atoms, and can lower the surface tension of the mixed liquid to suppress evaporation of the liquid; the nonionic fluorocarbon surfactant has excellent water solubility, can greatly reduce the surface tension of a system, has good emulsibility and extremely high dispersibility, and can prevent coal particle aggregation.
The mass percent of the polymer sulfonate is 10-90 wt%, the mass percent of the naphthalene sulfonate is 10-90 wt%, the mass percent of the lignin salt is 10-90 wt%, the mass percent of the ultrahigh molecular weight polysaccharide is 0.01-1 wt%, and the mass percent of the nonionic surfactant is 0.01-1 wt%. In this embodiment, the mass percentage of each additive in the composition may be: 15-85 wt% of polymer sulfonate, 15-80 wt% of naphthalene sulfonate, 15-80 wt% of lignin salt, 0.01-0.5 wt% of ultrahigh molecular weight polysaccharide and 0.02-0.8 wt% of nonionic surfactant; or the following steps: 20-80 wt% of polymer sulfonate, 20-60 wt% of naphthalene sulfonate, 20-60 wt% of lignin salt, 0.02-0.2 wt% of ultra-high molecular weight polysaccharide and 0.05-0.5 wt% of nonionic surfactant, so as to achieve the purpose of shear thinning of the water-coal-slurry fluid.
The coal water slurry comprises dry-based coal and a coal water suspension, and the content of the additive composition in the coal water slurry is 0.05-0.5 wt% of the weight of the dry-based coal. In the embodiment, when a plurality of additive components (polymer sulfonate, naphthalene sulfonate, lignin salt, ultra-high molecular weight polysaccharide and nonionic surfactant) are combined together for use, the components have good synergistic effect, coal particles are dispersed without aggregation, stably suspend without precipitation, the viscosity is rapidly reduced during shearing, the additive can be used for the coal water slurry with high proportion of solid components to obtain the coal water slurry with low viscosity, good suspension stability and good rheological property and high proportion of solid components, and the coal water slurry also has good anti-fouling capability when the coal water slurry has 65-75 wt% of solid content, and can recycle coal chemical wastewater as a water source of the coal water slurry.
The additive composition can be prepared into a solid powdery mixture and added into a ball mill or a rod mill in a powdery manner, the additive composition is added into a pulping process in the form of water or dry powder, and the dosage of a dry-based additive is 0.05-0.5 wt% of dry-based coal particles; or preparing 1-50 wt% aqueous solution, and adding into a ball mill or a rod mill in the form of solution.
As shown in figure 1, the mixing and preparation method of the coal water slurry comprises the following steps:
s100, coal preparation: selecting proper raw material coal, wherein the quality of the raw material coal should meet the requirements on ash content, sulfur content and heat value of the coal water slurry, and in the embodiment, inner Mongolia coal is selected;
s200, crushing and grinding: crushing raw material coal, grinding the crushed raw material coal to the fineness required by a coal water slurry product;
s300, kneading and stirring: when dry grinding and medium-concentration wet grinding processes are adopted, the coal sample can be uniformly mixed with water and a dispersing agent through kneading operation, slurrying with certain fluidity is preliminarily formed, then stirring operation is carried out, the coal slurry is uniformly mixed, and the coal water slurry is strongly sheared;
s400, filtering slurry: the water-coal-slurry after stirring and shearing passes through a slurry filter, and impurities can be removed.
The method for testing the stability of the coal water slurry comprises the following steps:
300.0g of coal water slurry is measured by a beaker with the diameter of 90mm, is uniformly stirred and sealed by a plastic film, and is kept stand for 24 hours at the temperature of 25 ℃, the coal water slurry is divided into two layers, the upper layer is clear water, and the lower layer is coal slurry. Removing the sealing plastic film, sucking out the clear water on the upper layer by using a suction pipe, weighing Wg, vertically contacting the coal slurry on the lower layer with a glass rod (the diameter is 6mm, the weight is 149.0-151.0 g) with a smooth surface on the upper liquid level, allowing the coal slurry to freely fall without applying external force, and starting to record, and observing whether the glass rod can fall to the bottom of the beaker within 30 s. If the time for the glass rod to fall to the bottom of the cup is 0-10 s, the glass rod is judged to be a free rod falling time, and meanwhile, the rod falling time is recorded. If the time for the glass rod to fall to the bottom of the cup is 11-30 s, the glass rod is judged to be slowly fallen, and meanwhile, the rod falling time is recorded. If the time for the glass rod to fall to the bottom of the cup exceeds 30s, the glass rod is judged to be unable to fall. Wherein, the water precipitation rate calculation formula is as follows:
water analysis rate (%). Wg/300X 100 (%).
In the invention, the preparation method of the polymer sodium sulfonate comprises the following steps:
example 1
160g of urea is dissolved in 86.5g of hot water, added into a 1000L four-neck flask, 138g of sodium bisulfite is added, the temperature is raised to 80 ℃ for reaction for 1h, then 40g of phenol is added, the pH value of the solution in the four-neck flask is adjusted to 8.5-9.0 by using 1% sodium hydroxide aqueous solution, the temperature is raised to 90 ℃, 365g of 37% formaldehyde is dripped, the formaldehyde dripping time is controlled to 2-2.5 h, the reaction temperature is controlled to 90 ℃, the formaldehyde dripping is finished, the reaction is continued for 1.5h at 90 ℃, and the sodium sulfonate polymer powder with the molecular weight of about 30000Da is obtained by spray drying.
Example 2
160g of urea is dissolved in 86.5g of hot water, added into a 1000L four-neck flask, 138g of sodium bisulfite is added, the temperature is raised to 80 ℃ for reaction for 1h, 53.6g of melamine is added, the pH value of the solution in the four-neck flask is adjusted to 8.0-8.5 by using 1% sodium hydroxide aqueous solution, the temperature is raised to 90 ℃, 365g of 37% formaldehyde is dripped, the formaldehyde dripping time is controlled to be 2-2.5 h, the reaction temperature is controlled to be 90 ℃, the formaldehyde is dripped, the reaction is continued for 1h at 90 ℃, and spray drying is carried out to obtain powdery polymer sodium sulfonate with the molecular weight of about 15000 Da.
In the invention, raw material coal is selected, crushed and ground, and then coal water slurry is prepared:
example 3
The inner Mongolia coal is ground, sieved and classified, and then mixed to prepare a test coal sample, and the particle size distribution test results of the test coal sample are shown in the following table:
| screen mesh specification | Particle size distribution (wt%) |
| Is greater than 8 meshes | 0 |
| 8 to 20 mesh | 1.36 |
| 20 to 40 mesh | 9.55 |
| 40 to 80 mesh | 25.22 |
| 80-120 mesh | 13.78 |
| 120 to 200 mesh | 7.15 |
| 200 to 325 mesh | 9.12 |
| < 325 mesh | 33.82 |
And (3) detecting the concentration, viscosity, fluidity and stability of the produced coal water slurry by adjusting the content of the additive composition so as to determine the effect of the additive composition.
Example 4
Wherein the polymer sulfonate (I) is the powdery polymer sodium sulfonate prepared in example 1, the molecular weight is about 30000Da, and the molecular weight of diutan is 1.5X 108Da, in the embodiment, the concentration of the coal water slurry is 73.52 wt%, the shear viscosity is low, and the fluidity and the stability are good.
Example 5
Wherein the polymer sulfonate (I) was the powdery polymer sodium sulfonate prepared in example 2, the molecular weight was about 15000Da, and the molecular weight of diutan was 8.6X 108Da, in the embodiment, the concentration of the coal-water slurry is 75.06 wt%,the shear viscosity is low, and the fluidity and the stability are good.
Example 6
Wherein the polymer sulfonate (I) is the powdery polymer sodium sulfonate prepared in example 1, the molecular weight is about 30000Da, and the molecular weight of the sodium carboxymethylcellulose is 1.2X 108Da, in the embodiment, the concentration of the coal water slurry is 65.15 wt%, the shear viscosity is low, and the fluidity and the stability are good.
Example 7
Wherein the polymer sulfonate (I) was the sodium polymer sulfonate powder prepared in example 2, having a molecular weight of about 15000Da and the molecular weight of sodium carboxymethylcellulose 9.5X 108Da, in the embodiment, the concentration of the coal water slurry is 71.65 wt%, the shear viscosity is low, and the fluidity and the stability are good.
In the above embodiment, after the additive composition is added in the process of preparing the coal water slurry, the concentration of the coal water slurry after shearing basically meets 65-75 wt%, and the coal water slurry has low shearing viscosity and good fluidity and stability and meets the requirements.
By adjusting the molecular weight of the ultra-high molecular weight polysaccharide in the additive composition and comparing the concentration, viscosity, fluidity and stability of the prepared coal water slurry:
comparative example 1
Among them, in comparative example 1, the excellent setting adhesive was changedThe molecular weight of the obtained coal water slurry is measured to determine the concentration, viscosity and fluidity of the coal water slurry, and compared with the results of example 4, in the comparative example 1, the content of diutan is unchanged, and the molecular weight is 2.3 multiplied by 107Da less than 1.0X 108Da, the concentration of the prepared coal water slurry is 73.5 wt%, and the coal water slurry is sheared at low speed (25 ℃ for 5 s)-1) The viscosity in this state was 1820 mPas, which substantially corresponded to 1860 mPas obtained in example 4, and the shear strength was increased at high shear (25 ℃ C., 100 s)-1) The viscosity in this state was 1520 mPas, which was much higher than 685 mPas obtained in example 4, and the flow property was such that comparative example 1 dropped out in a lump shape and example 4 flowed out in a continuous line shape.
Comparative example 2
Wherein, in the comparative example 2, the molecular weight of the sodium carboxymethylcellulose is changed to prepare the coal water slurry, and the concentration, the viscosity and the fluidity of the coal water slurry are detected, compared with the result of the example 7, in the comparative example 2, the content of the sodium carboxymethylcellulose is unchanged, and the molecular weight is 1.0 multiplied by 107Da less than 1.0X 108Da and much lower than the molecular weight of sodium carboxymethylcellulose in example 7 (M ═ 9.5 × 10)8Da) to obtain a coal-water slurry with a concentration of 71.63 wt%, and low-speed shearing (25 ℃, 5 s)-1) The viscosity in this state was 1810 mPas, which substantially corresponded to the result of example 7 of 1850 mPas, and the shear strength was increased at high shear (25 ℃ C., 100 s)-1) The viscosity in this state was 1500 mPas, which was much higher than 692 mPas obtained in example 7, and the fluidity of the composition was such that comparative example 2 dropped into a lump and example 7 flowed out in a continuous line.
As can be seen from comparative examples 1 and 2, the ultra-high molecular weight polysaccharide has a molecular weight of more than 1X 108During Da, the rheological property of the coal water slurry can be greatly improved, the viscosity of the coal water slurry under high shear rate can be reduced, and the fluidity of the coal water slurry can be improved.
Specifically, the source of the raw materials in the following examples are listed below:
urea, melamine, phenol, formaldehyde, sodium bisulfite, sodium hydroxide and other raw materials are all from chemical reagents of national drug group, ltd.
In conclusion, the coal water slurry prepared by the additive composition provided by the invention has high concentration, low viscosity, good suspension stability and good rheological property, and meets the requirement of coal water slurry used in the actual production of coal chemical industry.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. An additive composition for a coal water slurry, characterized by: the composite material comprises polymer sulfonate, naphthalene sulfonate, lignin salt, ultra-high molecular weight polysaccharide and a nonionic surfactant, wherein the polymer sulfonate has the following structural formula:
in the formula (1), M is independently Na or K, and X is independently
Or
And m and n in the structural formula of the polymer sulfonate are integer values in the range of 1 to 100.
2. The additive composition for coal-water slurry according to claim 1, wherein the naphthalene sulfonate is one or more of sodium methylene bis naphthalene sulfonate, potassium methylene bis naphthalene sulfonate, sodium methylene bis methyl naphthalene sulfonate, potassium methylene bis methyl naphthalene sulfonate, sodium methylene bis benzyl naphthalene sulfonate, potassium methylene bis benzyl naphthalene sulfonate, sodium methylene bis isopropyl naphthalene sulfonate, and potassium methylene bis isopropyl naphthalene sulfonate.
3. The additive composition for coal water slurry of claim 1, wherein the lignin salt is one or more of sodium lignin, potassium lignin, calcium lignin, sodium lignin sulfonate, potassium lignin sulfonate, and calcium lignin sulfonate.
4. The additive composition for coal-water slurry according to claim 1, wherein the ultra-high molecular weight polysaccharide is one or both of diutan and sodium carboxymethyl cellulose.
5. The additive composition for coal-water slurry according to claim 1, wherein the ultra-high molecular weight polysaccharide has a molecular weight of not less than 1 x 108Da。
6. The additive composition for coal-water slurry according to claim 1, wherein the nonionic surfactant is one or more of perfluoroalkyl ether polyoxyethylene ether type nonionic fluorocarbon surfactant, perfluoroalkyl ether acrylate type nonionic fluorocarbon surfactant, and perfluoroalkyl ether oxa type nonionic surfactant.
7. The additive composition for coal-water slurry according to claim 1, wherein the mass percent of the polymer sulfonate is 10-90 wt%, the mass percent of the naphthalene sulfonate is 10-90 wt%, the mass percent of the lignin salt is 10-90 wt%, the mass percent of the ultra-high molecular weight polysaccharide is 0.01-1 wt%, and the mass percent of the nonionic surfactant is 0.01-1 wt%.
8. The additive composition for coal-water slurry according to claim 1, wherein the coal-water slurry comprises a suspension of dry coal and coal water, and the additive composition is present in the coal-water slurry in an amount of 0.05 to 0.5 wt% based on the weight of the dry coal.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115651723A (en) * | 2022-11-15 | 2023-01-31 | 苏州永峰联环保科技有限公司 | Coal water slurry composite additive and preparation method thereof |
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| CN113512448B (en) | 2022-08-16 |
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