CN110819399A - Itaconic acid modified comb-type coal water slurry dispersant and synthetic method thereof - Google Patents
Itaconic acid modified comb-type coal water slurry dispersant and synthetic method thereof Download PDFInfo
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- C10L1/326—Coal-water suspensions
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Abstract
The invention provides an itaconic acid modified comb type coal water slurry dispersant and a synthesis method thereof, wherein the itaconic acid modified comb type coal water slurry dispersant is prepared from the following raw materials in parts by weight: 1-4 parts of 27% hydrogen peroxide, 570 parts of 460-mercaptide water, 0.4-2 parts of 3-mercaptopropionic acid, 350 parts of 200-allyl polyoxyethylene ether, 0.4-2 parts of sodium formaldehyde sulfoxylate, 6-13 parts of itaconic acid, 20-35 parts of acrylic acid, 3-6 parts of hydroxypropyl ester and 2-8 parts of sodium methallyl sulfonate. According to the invention, itaconic acid and sodium methallylsulfonate modified comb-type water-coal-slurry dispersing agent are adopted, itaconic acid is connected to the main chain, sulfonic group is introduced, and the product contains more hydroxyl, carboxyl, carbonyl, ester group, polyoxyethylene group, sulfonic group and other active groups which act on water-coal-slurry particles, so that the dispersing effect of the water-coal-slurry is enhanced, and the stability is good.
Description
Technical Field
The invention relates to the technical field of coal water slurry dispersants, and particularly relates to an itaconic acid modified comb-type coal water slurry dispersant and a synthesis method thereof.
Background
The coal water slurry is produced in the international oil crisis period at the end of the 70 s in the 21 st century, is a high and new technology product for planning to replace petroleum and utilizing coal, and mainly comprises about 60-70% of coal, about 30-40% of water and a small amount of water coal slurry additive, has good fluidity and stability, and has an appearance similar to that of heavy oil. The coal water slurry technology is characterized in that solid coal is converted into liquid coal-based fuel through a physical process, and the liquid coal-based fuel has good combustion characteristics and partial advantages of heavy oil, so that the solid coal-based fuel can be applied to industries such as power generation and the like instead of the heavy oil, and the coal water slurry is a novel clean fuel for replacing oil, which is simple in preparation process, easy to transport and store, safe and reliable in general. Since the advent, coal water slurries have found widespread use in western developed countries. China is a country rich in coal and lean in oil, and along with the acceleration of the industrialization pace of China, the rapid development of the coal water slurry technology, popularization and application, become important means for guaranteeing the energy safety of China and promoting sustainable development. The research of the coal water slurry additive as one of the important raw materials of the coal water slurry technology is bound to become the research and development direction of China, and the production and use cost of the coal water slurry additive is higher at present, so that the search and development of a synthetic method of a novel coal water slurry dispersant and a synthetic raw material of the novel coal water slurry dispersant have positive significance for promoting the leap-type development of the coal water slurry technology of China.
The water-coal-slurry dispersants that are being developed and utilized at present include naphthalenesulfonic acid condensates, lignin series, carboxylate series, phosphate series, and the like. The polycarboxylic acid series high molecular dispersant is a comb type coal water slurry additive with a flexible structure, and the molecular weight and the molecular structure of the additive can be changed according to actual needs, so that the additive can be widely applied to different coal water slurries. Generally, the molecular structure of the conventional polycarboxylic acid comb type coal water slurry additive mainly comprises two basic components, wherein the main chain comprises a polar group, and the main chain comprises a polyether side chain with a certain length. The domestic polycarboxylic acid water-coal-slurry dispersant has single synthetic raw material, is not renewable and has high price.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for modifying a comb-type coal water slurry dispersing agent by itaconic acid.
In order to achieve the purpose, the invention is realized by the following technical scheme:
an itaconic acid modified comb type coal water slurry dispersant is prepared from the following raw materials in parts by weight: 1-4 parts of 27% hydrogen peroxide, 570 parts of 460-mercaptide water, 0.4-2 parts of 3-mercaptopropionic acid, 350 parts of 200-allyl polyoxyethylene ether, 0.4-2 parts of sodium formaldehyde sulfoxylate, 6-13 parts of itaconic acid, 20-35 parts of acrylic acid, 3-6 parts of hydroxypropyl ester and 2-8 parts of sodium methallyl sulfonate. The 27% hydrogen peroxide is 27% hydrogen peroxide by mass concentration.
Preferably, the itaconic acid modified comb type coal water slurry dispersing agent is prepared from the following raw materials in parts by weight: 2.1 parts of 27% hydrogen peroxide, 500 parts of deionized water, 0.81 part of 3-mercaptopropionic acid, 330 parts of methyl allyl polyoxyethylene ether, 0.72 part of sodium formaldehyde sulfoxylate, 9.3 parts of itaconic acid, 20 parts of acrylic acid, 4.6 parts of hydroxypropyl ester and 6.2 parts of sodium methallyl sulfonate.
Preferably, the itaconic acid modified comb type coal water slurry dispersing agent is prepared from the following raw materials in parts by weight: 2.5 parts of 27% hydrogen peroxide, 530 parts of deionized water, 0.71 part of 3-mercaptopropionic acid, 300 parts of methyl allyl polyoxyethylene ether, 0.55 part of sodium formaldehyde sulfoxylate, 6.5 parts of itaconic acid, 21 parts of acrylic acid, 5.8 parts of hydroxypropyl ester and 7.4 parts of sodium methallyl sulfonate.
Preferably, the itaconic acid modified comb type coal water slurry dispersing agent is prepared from the following raw materials in parts by weight: the molecular weight of the methyl allyl polyoxyethylene ether is 200-600.
The synthesis method of the itaconic acid modified comb type coal water slurry dispersant comprises the following steps:
1) preparing a material A and a material B: the material A is prepared by uniformly mixing 80-120 parts of deionized water, 3-mercaptopropionic acid and rongalite according to the formula amount; the material B is prepared by uniformly mixing 70-100 parts of deionized water, acrylic acid, hydroxypropyl ester and sodium methallyl sulfonate;
2) adding 300 parts of methyl allyl polyoxyethylene ether, itaconic acid and deionized water in a formula amount into a reaction bottle, stirring and mixing uniformly, adding 27% hydrogen peroxide in a formula amount, stirring and mixing uniformly; after 10 minutes, simultaneously dripping the material A and the material B into the reaction bottle, wherein the dripping of the material A is finished after 2-5 hours, and the dripping of the material B is finished after 1.5-4 hours;
3) after the dripping is finished, the reaction is continued for 1h, and the residual deionized water with the formula amount is added.
The itaconic acid modified comb type coal water slurry dispersing agent has good application effect in coal water slurry. When the dispersant is used specifically, the itaconic acid modified hydrophobic coal water slurry dispersant or the mixed coal water slurry dispersant compounded with other dispersants is added into water and coal in the form of aqueous solution, and the mixing amount of the dispersant is 0.1-0.5% of that of the coal. The other dispersing agent is one or more of naphthalene water reducing agent, aliphatic water reducing agent and sodium lignosulphonate.
The invention has the beneficial effects that:
1. the invention adopts itaconic acid and sodium methallyl sulfonate modified comb type coal water slurry dispersing agent, connects itaconic acid on the main chain, and introduces sulfonic group to increase the dispersibility.
2. The product contains more hydroxyl, carboxyl, carbonyl, ester group, polyoxyethylene group, sulfonic group and other active groups which act on the coal water slurry particles, and the dispersion effect of the coal water slurry is enhanced. Meanwhile, the invention utilizes itaconic acid to modify carboxylic acid comb type water-coal-slurry dispersant, and the obtained product has better stability.
3. The coal water slurry dispersing agent prepared by the invention can act on coal water slurry alone to play a good role in dispersing, and if the dispersing agent is compounded with other dispersing agents (such as naphthalene water reducing agents, aliphatic water reducing agents, sodium lignosulfonate and the like) and soda ash according to a certain proportion, the dispersing effect, the adaptability and the stability of the product can be greatly improved compared with the single use.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following examples, sodium lignosulfonate, which is denoted by NX, and a naphthalenesulfonate formaldehyde condensate, which is produced by Anhuxin solid environmental protection science and technology Co., Ltd, sodium lignosulfonate, which is denoted by SL, were used in comparative tests.
In the examples described below, the molecular weight of methallyl polyoxyethylene ether is 200-600.
The instrument and the detection method for detecting the characteristics of the coal water slurry are as follows:
1. the experimental apparatus is a Brookield Bohler fly DV1 viscometer, a 150ml beaker, and a halogen moisture meter, USA.
2.① switching on the power supply of the experimental instrument, adjusting the level and automatically adjusting the zero, ② taking the same amount of sample and placing the sample in a 150ml beaker to ensure the temperature and the quality of the measured sample, placing the beaker below the instrument to enable a rotor to enter the sample until the scale mark on the rotor, pressing a start key to start the test, ③ measuring the viscosity of the sample by using a 62# rotor at the speed of a shearing speed position 20, and comparing the viscosity under the same instrument, rotor, speed, container, temperature and test time.
The experimental instrument and the detection method used for the fluidity experiment are as follows:
1. laboratory apparatus
a. Truncated cone circular die: the diameter of the upper opening is 36mm, the diameter of the lower opening is 60mm, the height is 60mm, and the inner wall is smooth and seamless.
b. Glass plate (400X 400mm, thickness 5mm)
c. Straightedge in steel (300mm)
d. Scraping knife
2.① placing the glass plate in horizontal position, wetting the glass plate, truncated cone round mould, stirrer and stirring pot with wet cloth to make its surface wet without water stain ② placing the truncated cone round mould in the center of the glass plate and covering with wet cloth for standby ③ quickly injecting the water-coal-slurry into the truncated cone round mould, scraping with scraper, lifting the truncated cone round mould vertically to make the water-coal-slurry flow on the glass plate until it does not flow, measuring the maximum diameter of the flowing part in two directions perpendicular to each other with a ruler, and taking the average value as the fluidity of the water-coal-slurry.
And (3) stability testing:
the stability is detected by adopting a rod dropping method, and the required experimental instrument and the detection method are as follows:
1. laboratory apparatus
150ml beaker, electronic balance, preservative film, 300mm ruler and timer.
2. The experimental steps are as follows:
150g of the coal water slurry was weighed into a 150ml beaker, completely sealed with a sealing film, left to stand at room temperature, and the depths (H1 and H2) of 10X 200mm glass rods at 10s for 5 minutes were measured within 24 hours while the actual depths (H) were measured to calculate the soft precipitation rate and the hard precipitation rate in accordance with the following equation. Soft precipitation rate (H-H1)/Hx100%, and hard precipitation rate (H-H2)/Hx100%
The following are specific examples:
example 1:
an itaconic acid modified comb type coal water slurry dispersant is prepared from the following raw materials in parts by weight: 2.1 parts of 27% hydrogen peroxide, 500 parts of deionized water, 0.81 part of 3-mercaptopropionic acid, 330 parts of monomer (methacrylic polyoxyethylene ether), 0.72 part of sodium formaldehyde sulfoxylate, 9.3 parts of itaconic acid, 20 parts of acrylic acid, 4.6 parts of hydroxypropyl ester and 6.2 parts of sodium methallylsulfonate.
The synthesis method of the itaconic acid modified comb type coal water slurry dispersant comprises the following steps:
1) preparing a material A and a material B: the material A is prepared by uniformly mixing 80 parts of deionized water, 3-mercaptopropionic acid and rongalite according to the formula amount; the material B is prepared by uniformly mixing 100 parts of deionized water, acrylic acid with the formula amount, hydroxypropyl ester with the formula amount and sodium methallyl sulfonate with the formula amount.
2) Adding the monomer, the itaconic acid and the deionized water 245 parts according to the formula amount into a four-neck flask, stirring and mixing uniformly, adding the hydrogen peroxide 27% according to the formula amount, and stirring and mixing uniformly. After 10 minutes, the material A and the material B are simultaneously dropped into the four-neck flask, the material A is completely dropped for 3.5 hours, and the liquid B is completely dropped for 3 hours.
3) After the dripping is finished, the reaction is continued for 1h, and the residual deionized water with the formula amount is added.
The dispersant Mo-1 obtained in the example 1 is applied to coal water slurry of Qinghai salt lake, wherein the itaconic acid modified sparse coal water slurry dispersant Mo-1 or a mixed coal water slurry dispersant compounded with other dispersants is added into water and coal in the form of aqueous solution, the mixing amount of the dispersant is 0.1-0.5% of that of the coal, and various indexes such as the concentration, the viscosity, the expansion degree, the stability and the like of the coal water slurry are measured. And NX (naphthalene sulfonate formaldehyde condensate) and SL (sodium lignosulfonate) which are commonly used in the market are selected as a control group, and the concentration (%), the viscosity (mPa.s), the expansion degree (mm), the stability and other indexes are detected under the condition of consistent mixing amount. The results are shown in Table 1.
TABLE 1 Mo-1 comparison data of coal-water slurry concentration, viscosity, extension degree and stability at 90s coal grinding time and 0.35% dispersant addition
As can be seen from Table 1, under the condition of consistent experimental conditions and the same dispersant dosage, Mo-1 has obvious dispersibility which is slightly worse than the commonly used dispersing effect of NX and SL compounding, and the prepared coal water slurry has good stability. The effect of the Mo-1 compounded with SL, NX and SL + NX is better than that of the Mo-1 used alone, and is equivalent to that of the common SL + NX. However, the data table is only limited to the results obtained by the ratio of the compound mixing, and Mo-1 can be compounded and mixed with various dispersants, sodium carbonate and the like according to different ratios, so that the obtained dispersivity is different.
Example 2:
an itaconic acid modified comb type coal water slurry dispersant is prepared from the following raw materials in parts by weight: 2.5 parts of hydrogen peroxide, 530 parts of deionized water, 0.71 part of 3-mercaptopropionic acid, 300 parts of monomer (methacrylic polyoxyethylene ether), 0.55 part of sodium formaldehyde sulfoxylate, 6.5 parts of itaconic acid, 21 parts of acrylic acid, 5.8 parts of hydroxypropyl ester and 7.4 parts of sodium methallylsulfonate.
The synthesis method of the itaconic acid modified comb type coal water slurry dispersant comprises the following steps:
1) preparing a material A and a material B: the material A is prepared by uniformly mixing 90 parts of deionized water, 3-mercaptopropionic acid and rongalite according to the formula amount; the material B is prepared by uniformly mixing 90 parts of deionized water, acrylic acid with the formula amount, hydroxypropyl ester with the formula amount and sodium methallyl sulfonate with the formula amount.
2) And adding the monomer, the itaconic acid and 230 parts of deionized water in the formula amount into the other four-neck flask, stirring and mixing uniformly, adding 27% hydrogen peroxide in the formula amount, and stirring and mixing uniformly. After 10 minutes, the material A and the material B are dripped into the four-neck flask simultaneously, and the dripping of the material A is completed within 3 hours, and the dripping of the material B is completed within 2.5 hours.
3) After the dripping is finished, the reaction is continued for 1h, and the residual deionized water with the formula amount is added.
The dispersant Mo-2 in the embodiment 2 is applied to coal water slurry of Qinghai salt lake coal, the coal water slurry dispersant Mo-2 obtained by modifying the sparse type coal water slurry dispersant with itaconic acid or a mixed coal water slurry dispersant compounded with other dispersants is added into water and coal in the form of aqueous solution, the mixing amount of the dispersant is 0.1-0.5 percent of that of the coal, and various indexes such as the concentration, the viscosity, the expansion degree, the stability and the like of the coal water slurry are measured. And NX (naphthalene sulfonate formaldehyde condensate) and SL (sodium lignosulfonate) which are commonly used in the market are selected as a control group, and the concentration (%), the viscosity (mPa.s), the expansion degree (mm), the stability and other indexes are detected under the condition of consistent mixing amount. The results are shown in Table 2.
TABLE 2 Mo-2 comparison data of coal-water slurry concentration, viscosity, extension degree and stability at 90s coal grinding time and 0.35% dispersant addition
As can be seen from Table 2, under the condition of consistent experimental conditions and the same dispersant dosage, Mo-2 has obvious dispersibility which is slightly poorer than the dispersion effect of the commonly used NX and SL compound, and the prepared coal water slurry has good stability. The effect of the compound of Mo-2, SL, NX and SL + NX is better than that of the single use of Mo-2, and is equivalent to that of the compound of SL + NX. However, the data table is only limited to the results obtained by the ratio of the compound mixing, and the dispersivity of Mo-2 which is compounded and mixed with various dispersants, soda ash and the like according to different ratios is also different.
Example 3:
an itaconic acid modified comb type coal water slurry dispersant is prepared from the following raw materials in parts by weight: 4 parts of 27% hydrogen peroxide, 550 parts of deionized water, 1.1 parts of 3-mercaptopropionic acid, 350 parts of methyl allyl polyoxyethylene ether, 0.91 part of sodium formaldehyde sulfoxylate, 10.2 parts of itaconic acid, 20 parts of acrylic acid, 3.6 parts of hydroxypropyl ester and 5.2 parts of sodium methallyl sulfonate.
The synthesis method of the itaconic acid modified comb type coal water slurry dispersant comprises the following steps:
1) preparing a material A and a material B: the material A is prepared by uniformly mixing 120 parts of deionized water, 3-mercaptopropionic acid and rongalite according to the formula amount; the material B is prepared by uniformly mixing 100 parts of deionized water, acrylic acid with the formula amount, hydroxypropyl ester with the formula amount and sodium methallyl sulfonate with the formula amount.
2) Adding 300 parts of monomer, itaconic acid and deionized water according to the formula amount into a four-neck flask, stirring and mixing uniformly, adding 27% hydrogen peroxide according to the formula amount, and stirring and mixing uniformly. After 10 minutes, the material A and the material B are dripped into the four-neck flask simultaneously, the dripping of the material A is finished after 2.5 hours, and the dripping of the liquid B is finished after 3 hours.
3) After the dripping is finished, the reaction is continued for 1h, and the residual deionized water with the formula amount is added.
The dispersant Mo-3 in the embodiment 3 is applied to coal water slurry of Qinghai salt lake coal, the coal water slurry dispersant Mo-3 obtained by modifying the sparse type coal water slurry dispersant with itaconic acid or a mixed coal water slurry dispersant compounded with other dispersants is added into water and coal in the form of aqueous solution, the mixing amount of the dispersant is 0.1-0.5 percent of that of the coal, and various indexes such as the concentration, the viscosity, the expansion degree, the stability and the like of the coal water slurry are measured. And NX (naphthalene sulfonate formaldehyde condensate) and SL (sodium lignosulfonate) which are commonly used in the market are selected as a control group, and the concentration (%), the viscosity (mPa.s), the expansion degree (mm), the stability and other indexes are detected under the condition of consistent mixing amount. The results are shown in Table 3.
Table 3 comparison data of concentration, viscosity, extension degree and stability of the coal water slurry when the coal grinding time of Mo-3 is 90s and the mixing amount of the dispersant is 0.35 percent
As can be seen from Table 3, under the condition of consistent experimental conditions and the same dispersant dosage, Mo-3 has obvious dispersibility which is slightly poorer than the dispersion effect of the commonly used NX and SL compound, and the prepared coal water slurry has good stability. The effect of the compound of Mo-3, SL, NX and SL + NX is better than that of the single use of Mo-3. However, the data table is only limited to the results obtained by the ratio of the compound mixing, and the dispersivity of Mo-3 which is compounded and mixed with various dispersants, soda ash and the like according to different ratios is also different.
Example 4:
an itaconic acid modified comb type coal water slurry dispersant is prepared from the following raw materials in parts by weight: 3.2 parts of 27% hydrogen peroxide, 570 parts of deionized water, 0.45 part of 3-mercaptopropionic acid, 280 parts of methyl allyl polyoxyethylene ether, 1.82 parts of sodium formaldehyde sulfoxylate, 6 parts of itaconic acid, 27 parts of acrylic acid, 3 parts of hydroxypropyl ester and 7.8 parts of sodium methallyl sulfonate.
The synthesis method of the itaconic acid modified comb type coal water slurry dispersant comprises the following steps:
1) preparing a material A and a material B: the material A is prepared by uniformly mixing 100 parts of deionized water, 3-mercaptopropionic acid and rongalite according to the formula amount; the material B is prepared by uniformly mixing 90 parts of deionized water, acrylic acid with the formula amount, hydroxypropyl ester with the formula amount and sodium methallyl sulfonate with the formula amount.
2) Adding 265 parts of monomer, itaconic acid and deionized water according to the formula amount into a four-neck flask, stirring and mixing uniformly, adding 27% hydrogen peroxide according to the formula amount, and stirring and mixing uniformly. After 10 minutes, the material A and the material B are dripped into the four-neck flask simultaneously, 5 hours of the material A are dripped, and 4 hours of the liquid B are dripped.
3) After the dripping is finished, the reaction is continued for 1h, and the residual deionized water with the formula amount is added.
The dispersant Mo-4 in the embodiment 4 is applied to coal water slurry of Qinghai salt lake coal, the coal water slurry dispersant Mo-4 obtained by modifying the sparse type coal water slurry dispersant with itaconic acid or a mixed coal water slurry dispersant compounded with other dispersants is added into water and coal in the form of aqueous solution, the mixing amount of the dispersant is 0.1-0.5 percent of that of the coal, and various indexes such as the concentration, the viscosity, the expansion degree, the stability and the like of the coal water slurry are measured. And NX (naphthalene sulfonate formaldehyde condensate) and SL (sodium lignosulfonate) which are commonly used in the market are selected as a control group, and the concentration (%), the viscosity (mPa.s), the expansion degree (mm), the stability and other indexes are detected under the condition of consistent mixing amount. The results are shown in Table 4.
TABLE 4 comparison data of Mo-4 in coal grinding time of 90s and 0.35% dispersant content for coal water slurry concentration, viscosity, extension degree and stability
As can be seen from Table 4, under the condition of consistent experimental conditions and the same dispersant dosage, Mo-4 has obvious dispersibility which is slightly poorer than the dispersion effect of the commonly used NX and SL compound, and the prepared coal water slurry has good stability. The effect of the compound of Mo-4, SL, NX and SL + NX is better than that of the single use of Mo-4. However, the data table is only limited to the results obtained by the ratio of the compound mixing, and the dispersivity of Mo-4 which is compounded and mixed with various dispersants, soda ash and the like according to different ratios is also different.
Example 5:
an itaconic acid modified comb type coal water slurry dispersant is prepared from the following raw materials in parts by weight: 1 part of 27% hydrogen peroxide, 460 parts of deionized water, 2 parts of 3-mercaptopropionic acid, 200 parts of methallyl polyoxyethylene ether, 0.43 part of sodium formaldehyde sulfoxylate, 12.3 parts of itaconic acid, 35 parts of acrylic acid, 6 parts of hydroxypropyl ester and 2.1 parts of sodium methallyl sulfonate.
The synthesis method of the itaconic acid modified comb type coal water slurry dispersant comprises the following steps:
1) preparing a material A and a material B: the material A is prepared by uniformly mixing 80 parts of deionized water, 3-mercaptopropionic acid and rongalite according to the formula amount; the material B is prepared by uniformly mixing 80 parts of deionized water, acrylic acid with the formula amount, hydroxypropyl ester with the formula amount and sodium methallyl sulfonate with the formula amount.
2) Adding the monomer, the itaconic acid and the deionized water in the formula amount of 200 parts into a four-neck flask, stirring and mixing uniformly, adding the hydrogen peroxide of 27% in the formula amount, and stirring and mixing uniformly. After 10 minutes, the material A and the material B are dripped into the four-neck flask simultaneously, and the dripping of the material A is completed within 3 hours, and the dripping of the liquid B is completed within 3.5 hours.
3) After the dripping is finished, the reaction is continued for 1h, and the residual deionized water with the formula amount is added.
The dispersant Mo-5 in the embodiment 5 is applied to coal water slurry of Qinghai salt lake coal, the coal water slurry dispersant Mo-5 obtained by modifying the sparse type coal water slurry dispersant with itaconic acid or a mixed coal water slurry dispersant compounded with other dispersants is added into water and coal in the form of aqueous solution, the mixing amount of the dispersant is 0.1-0.5 percent of that of the coal, and various indexes such as the concentration, the viscosity, the expansion degree, the stability and the like of the coal water slurry are measured. And NX (naphthalene sulfonate formaldehyde condensate) and SL (sodium lignosulfonate) which are commonly used in the market are selected as a control group, and the concentration (%), the viscosity (mPa.s), the expansion degree (mm), the stability and other indexes are detected under the condition of consistent mixing amount. The results are shown in Table 5.
TABLE 5 Mo-5 data comparing coal-water slurry concentration, viscosity, extension and stability at 90s coal-milling time and 0.35% dispersant content
As can be seen from Table 5, under the condition of consistent experimental conditions and the same dispersant dosage, Mo-5 has obvious dispersibility which is slightly poorer than the commonly used dispersing effect of NX and SL compounding, and the prepared coal water slurry has good stability. The effect of the compound of Mo-5, SL, NX and SL + NX is better than that of the single use of Mo-5. However, the data table is only limited to the results obtained by the ratio of the compound mixing, and the dispersivity of Mo-5, various dispersants, sodium carbonate and the like which are compounded and mixed according to different ratios is also different.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. An itaconic acid modified comb type coal water slurry dispersant is characterized by being prepared from the following raw materials in parts by weight: 1-4 parts of 27% hydrogen peroxide, 570 parts of 460-mercaptide water, 0.4-2 parts of 3-mercaptopropionic acid, 350 parts of 200-allyl polyoxyethylene ether, 0.4-2 parts of sodium formaldehyde sulfoxylate, 6-13 parts of itaconic acid, 20-35 parts of acrylic acid, 3-6 parts of hydroxypropyl ester and 2-8 parts of sodium methallyl sulfonate.
2. The itaconic acid modified comb-type coal water slurry dispersant of claim 1, which is prepared from the following raw materials in parts by weight: 2.1 parts of 27% hydrogen peroxide, 500 parts of deionized water, 0.81 part of 3-mercaptopropionic acid, 330 parts of methyl allyl polyoxyethylene ether, 0.72 part of sodium formaldehyde sulfoxylate, 9.3 parts of itaconic acid, 20 parts of acrylic acid, 4.6 parts of hydroxypropyl ester and 6.2 parts of sodium methallyl sulfonate.
3. The itaconic acid modified comb-type coal water slurry dispersant of claim 1, which is prepared from the following raw materials in parts by weight: 2.5 parts of 27% hydrogen peroxide, 530 parts of deionized water, 0.71 part of 3-mercaptopropionic acid, 300 parts of methyl allyl polyoxyethylene ether, 0.55 part of sodium formaldehyde sulfoxylate, 6.5 parts of itaconic acid, 21 parts of acrylic acid, 5.8 parts of hydroxypropyl ester and 7.4 parts of sodium methallyl sulfonate.
4. The itaconic acid modified comb-type coal water slurry dispersant of claim 1, wherein the molecular weight of the methallyl polyoxyethylene ether is 200-600.
5. The method for synthesizing the itaconic acid modified comb-type coal water slurry dispersant according to any one of claims 1 to 4, comprising the following steps:
1) preparing a material A and a material B: the material A is prepared by uniformly mixing 80-120 parts of deionized water, 3-mercaptopropionic acid and rongalite according to the formula amount; the material B is prepared by uniformly mixing 70-100 parts of deionized water, acrylic acid, hydroxypropyl ester and sodium methallyl sulfonate;
2) adding 300 parts of methyl allyl polyoxyethylene ether, itaconic acid and deionized water in a formula amount into a reaction bottle, stirring and mixing uniformly, adding 27% hydrogen peroxide in a formula amount, stirring and mixing uniformly; after 10 minutes, simultaneously dripping the material A and the material B into the reaction bottle, wherein the dripping of the material A is finished after 2-5 hours, and the dripping of the material B is finished after 1.5-4 hours;
3) after the dripping is finished, the reaction is continued for 1h, and the residual deionized water with the formula amount is added.
6. The use of the itaconic acid-modified comb-type water-coal-slurry dispersant of any one of claims 1 to 4 in water-coal-slurry.
7. The application of claim 6, wherein the itaconic acid modified hydrophobic coal water slurry dispersant or the mixed coal water slurry dispersant compounded with other dispersants is added into water and coal in the form of aqueous solution, and the mixing amount of the dispersant is 0.1% -0.5% of the coal.
8. The use according to claim 7, wherein the other dispersant is one or more of a naphthalene water reducer, an aliphatic water reducer, and sodium lignosulfonate.
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