A viscosity reducer and slurry preparation method suitable for preparing coal-water slurry from high-viscosity organic wastewater

Abstract

This invention discloses a viscosity reducer and a slurry preparation method suitable for preparing coal-water slurry from high-viscosity organic wastewater. The high-viscosity organic wastewater viscosity reducer is prepared by adding naphthoic acid (obtained from methylnaphthalene oxidation) to ethylene oxide and propylene oxide in a certain proportion. The slurry preparation method involves adding sodium naphthalenesulfonate as an additive to the high-viscosity organic wastewater after viscosity reduction to obtain the coal-water slurry. This invention overcomes the disadvantage that high-viscosity organic wastewater is unsuitable for preparing coal-water slurry, successfully using a viscosity reducer to reduce the viscosity of high-viscosity organic wastewater and obtain a high-coal-content coal-water slurry.

Description

Technical Field

[0001] This invention relates to a viscosity reducer and a pulping method, specifically to a viscosity reducer and a pulping method suitable for preparing coal-water slurry from high-viscosity organic wastewater. Background Technology

[0002] Coal-water slurry is a fuel made by mixing pulverized coal with water to form a suspension. It promotes the efficient and clean utilization of coal and the transformation of related industries, and is of great strategic significance for the protection of national resources, the protection of resources and the environment, and the development of the chemical economy.

[0003] Common sources of high-viscosity organic wastewater include: 1. Industrial production: High-viscosity organic wastewater can originate from various industrial processes, such as chemical plants, oil refineries, pharmaceutical factories, and textile mills. These industrial processes typically involve the use of large amounts of organic matter and solvents, resulting in wastewater containing high concentrations of organic compounds. 2. Agricultural activities: The agricultural sector uses pesticides, fertilizers, and other chemicals to increase crop yields. These chemicals can enter the soil and water bodies, forming high-viscosity organic wastewater. Especially in livestock and poultry farms, livestock wastewater can also contain high concentrations of organic matter. 3. Municipal sewage: Urban sewage treatment plants treat wastewater from households, commercial buildings, and industrial areas. If the treatment process is inadequate or if industrial wastewater is mixed in, the sewage treatment plant's discharge may contain high-viscosity organic wastewater.

[0004] The process of preparing coal-water slurry from high-viscosity organic wastewater is relatively complex. First, high-viscosity organic wastewater typically contains suspended solids and organic compounds, therefore pretreatment is necessary to remove impurities such as solid particles and precipitates. Second, due to the specific characteristics of high-viscosity organic wastewater, viscosity reducers need to be added to lower its viscosity. Then, the coal powder needs to be selected based on the wastewater's properties and the desired properties of the coal-water slurry. Finally, parameters such as the solids content and flowability of the coal slurry are adjusted as needed to ensure that the prepared coal-water slurry meets the expected requirements.

[0005] Recycling wastewater during coal chemical production is one of the most promising methods, and high-viscosity organic wastewater accounts for a particularly significant proportion of wastewater discharge. Therefore, the reuse of high-viscosity organic wastewater has a substantial impact on industrial upgrading. However, existing traditional coal-water slurry methods struggle to utilize high-viscosity organic wastewater to prepare high-concentration coal-water slurry with excellent characteristics such as good stability, high efficiency, low environmental pollution, and high economic benefits. This technical problem urgently needs to be solved. Summary of the Invention

[0006] Purpose of the invention: The present invention aims to provide a viscosity reducer suitable for preparing coal-water slurry from high-viscosity organic wastewater, overcoming the disadvantage that traditional coal-water slurry is difficult to prepare using high-viscosity organic wastewater; another purpose of the present invention is to provide a method for preparing coal-water slurry with high coal content using the aforementioned viscosity reducer.

[0007] Technical solution: The viscosity reducer of the present invention, suitable for preparing coal-water slurry from high-viscosity organic wastewater, has the following structural formula:

[0008]

[0009] Where n, m = 3 to 7.

[0010] The viscosity reducer is obtained by adding naphthoic acid, obtained from the oxidation of methylnaphthalene, with ethylene oxide and propylene oxide in different molar ratios, wherein the molar ratio of ethylene oxide and propylene oxide is 3:7 to 7:3.

[0011] A method for preparing coal-water slurry using the aforementioned viscosity reducer to reduce the viscosity of high-viscosity organic wastewater includes the following slurry preparation steps:

[0012] (1) Prepare the viscosity reducer into a solution;

[0013] (2) Viscosity reduction of high-viscosity organic wastewater: Mix the above viscosity reducer solution with high-viscosity organic wastewater, stir evenly at room temperature, and then mechanically stir to obtain viscosity-reduced organic wastewater;

[0014] (3) Preparation of coal-water slurry: Take the above-mentioned viscosity-reducing organic wastewater, add coal-water slurry additives, and add coal powder while stirring.

[0015] The high-viscosity organic wastewater is aniline tar with a viscosity of 10,000 to 20,000 cp.

[0016] The high-viscosity organic wastewater has a content of 5% to 10% in the viscosity-reducing organic wastewater.

[0017] The coal-water slurry additive is sodium naphthalene sulfonate.

[0018] The concentration of the sodium naphthalenesulfonate is 0.2% to 0.4%.

[0019] The dry coal powder accounts for 61% to 64% of the total weight of the raw materials.

[0020] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: (1) The viscosity reducer can effectively reduce the viscosity of high-viscosity organic wastewater and then use it for the efficient preparation of coal-water slurry; the high-viscosity organic wastewater that could not be used before can be reused, which saves wastewater treatment costs and creates economic benefits for the chemical industry; (2) The prepared coal-water slurry has the characteristics of high coal content, which improves energy density and combustion efficiency, focuses on reducing adverse environmental impact, can significantly reduce the emission of air pollutants, and reduce the consumption and pollution of water resources; (3) The prepared coal-water slurry has excellent characteristics such as good product stability, good flow performance, wide range of use, high efficiency, low environmental pollution, simple operation, and high economic benefits. Attached Figure Description

[0021] Figure 1 The infrared spectrum of the viscosity reducer prepared according to the present invention is shown. Detailed Implementation

[0022] The technical solution of the present invention will be further described below.

[0023] Example 1

[0024] 1) Weigh 1.42g of methylnaphthalene and add it to 9.48g of potassium permanganate for a mixed reaction. Extract with diethyl ether to obtain naphthoic acid. Under an anhydrous and oxygen-free environment, add ethylene oxide and propylene oxide in a molar ratio of 3:7 for an addition reaction to obtain… Add an appropriate amount of concentrated sulfuric acid and react to obtain Adding sodium hydroxide to neutralize the reaction yields a viscosity reducer. Dissolve 0.1g of viscosity reducer in water to prepare a viscosity reducer solution with a concentration of 0.1%.

[0025] 2) Take 95g of the above viscosity reducer solution into a beaker, add 5g of aniline tar, stir evenly at room temperature to obtain viscosity-reducing organic wastewater.

[0026] 3) Take 99.8g of the above-mentioned viscosity-reducing organic wastewater into a beaker, add 0.2g of sodium naphthalenesulfonate, a coal-water slurry additive, and stir until homogeneous. While stirring, slowly add 156g of coal powder to prepare the coal-water slurry. Measure its viscosity and observe its flowability.

[0027] Example 2

[0028] 1) Weigh 1.42g of methylnaphthalene and add it to 9.48g of potassium permanganate for a mixed reaction. Extract with diethyl ether to obtain naphthoic acid. Under an anhydrous and oxygen-free environment, add ethylene oxide and propylene oxide in a molar ratio of 4:6 for an addition reaction to obtain… Add an appropriate amount of concentrated sulfuric acid and react to obtain Adding sodium hydroxide to neutralize the reaction yields a viscosity reducer. Dissolve 0.1g of viscosity reducer in water to prepare a viscosity reducer solution with a concentration of 0.1%.

[0029] 2) Take 95g of the above viscosity reducer solution into a beaker, add 5g of aniline tar, stir evenly at room temperature to obtain viscosity-reducing organic wastewater.

[0030] 3) Take 99.8g of the reduced-viscosity high-viscosity organic wastewater into a beaker, add 0.2g of sodium naphthalenesulfonate, a coal-water slurry additive, and stir until homogeneous. While stirring, slowly add 156g of coal powder to prepare the coal-water slurry. Measure its viscosity and observe its flowability.

[0031] Example 3

[0032] 1) Weigh 1.42g of methylnaphthalene and add it to 9.48g of potassium permanganate for a mixed reaction. Extract with diethyl ether to obtain naphthoic acid. Under an anhydrous and oxygen-free environment, add ethylene oxide and propylene oxide in a molar ratio of 5:5 for an addition reaction to obtain… Add an appropriate amount of concentrated sulfuric acid and react to obtain Adding sodium hydroxide to neutralize the reaction yields a viscosity reducer. Dissolve 0.1g of viscosity reducer in water to prepare a viscosity reducer solution with a concentration of 0.1%.

[0033] 2) Take 95g of the above viscosity reducer solution into a beaker, add 5g of aniline tar, stir evenly at room temperature to obtain viscosity-reducing organic wastewater.

[0034] 3) Take 99.8g of the reduced-viscosity high-viscosity organic wastewater into a beaker, add 0.2g of sodium naphthalenesulfonate, a coal-water slurry additive, and stir until homogeneous. While stirring, slowly add 156g of coal powder to prepare the coal-water slurry. Measure its viscosity and observe its flowability.

[0035] Example 4

[0036] 1) Weigh 1.42g of methylnaphthalene and add it to 9.48g of potassium permanganate for a mixed reaction. Extract with diethyl ether to obtain naphthoic acid. Under an anhydrous and oxygen-free environment, add ethylene oxide and propylene oxide in a molar ratio of 6:4 for an addition reaction to obtain… Add an appropriate amount of concentrated sulfuric acid and react to obtain Adding sodium hydroxide to neutralize the reaction yields a viscosity reducer. Dissolve 0.1g of viscosity reducer in water to prepare a viscosity reducer solution with a concentration of 0.1%.

[0037] 2) Take 95g of the above viscosity reducer solution into a beaker, add 5g of aniline tar, stir evenly at room temperature to obtain viscosity-reducing organic wastewater.

[0038] 3) Take 99.8g of the reduced-viscosity high-viscosity organic wastewater into a beaker, add 0.2g of sodium naphthalenesulfonate, a composite additive for coal-water slurry, and stir until homogeneous. While stirring, slowly add 156g of coal powder to prepare the coal-water slurry. Measure its viscosity and observe its flowability.

[0039] Example 5

[0040] 1) Weigh 1.42g of methylnaphthalene and add it to 9.48g of potassium permanganate for a mixed reaction. Extract with diethyl ether to obtain naphthoic acid. Under an anhydrous and oxygen-free environment, add ethylene oxide and propylene oxide in a molar ratio of 7:3 for an addition reaction to obtain… Add an appropriate amount of concentrated sulfuric acid and react to obtain Adding sodium hydroxide to neutralize the reaction yields a viscosity reducer. Dissolve 0.1g of viscosity reducer in water to prepare a viscosity reducer solution with a concentration of 0.1%.

[0041] 2) Take 95g of the above viscosity reducer solution into a beaker, add 5g of aniline tar, stir evenly at room temperature to obtain viscosity-reducing organic wastewater.

[0042] 3) Take 99.8g of the reduced-viscosity high-viscosity organic wastewater into a beaker, add 0.2g of sodium naphthalenesulfonate, a composite additive for coal-water slurry, and stir until homogeneous. While stirring, slowly add 156g of coal powder to prepare the coal-water slurry. Measure its viscosity and observe its flowability.

[0043] Example 6

[0044] 1) Weigh 1.42g of methylnaphthalene and add it to 9.48g of potassium permanganate for a mixed reaction. Extract with diethyl ether to obtain naphthoic acid. Under an anhydrous and oxygen-free environment, add ethylene oxide and propylene oxide in a molar ratio of 3:7 for an addition reaction to obtain… Add an appropriate amount of concentrated sulfuric acid and react to obtain Adding sodium hydroxide to neutralize the reaction yields a viscosity reducer. Dissolve 0.1g of viscosity reducer in water to prepare a viscosity reducer solution with a concentration of 0.1%.

[0045] 2) Take 95g of the above viscosity reducer solution into a beaker, add 5g of aniline tar, stir evenly at room temperature to obtain viscosity-reducing organic wastewater.

[0046] 3) Take 99.7g of the reduced-viscosity high-viscosity organic wastewater into a beaker, add 0.3g of sodium naphthalenesulfonate, a coal-water slurry additive, and stir until homogeneous. While stirring, slowly add 156g of coal powder to prepare the coal-water slurry. Measure its viscosity and observe its flowability.

[0047] Example 7

[0048] 1) Weigh 1.42g of methylnaphthalene and add it to 9.48g of potassium permanganate for a mixed reaction. Extract with diethyl ether to obtain naphthoic acid. Under an anhydrous and oxygen-free environment, add ethylene oxide and propylene oxide in a molar ratio of 4:6 for an addition reaction to obtain… Add an appropriate amount of concentrated sulfuric acid and react to obtain Adding sodium hydroxide to neutralize the reaction yields a viscosity reducer. Dissolve 0.1g of viscosity reducer in water to prepare a viscosity reducer solution with a concentration of 0.1%.

[0049] 2) Take 95g of the above viscosity reducer solution into a beaker, add 5g of aniline tar, stir evenly at room temperature to obtain viscosity-reducing organic wastewater.

[0050] 3) Take 99.7g of the reduced-viscosity high-viscosity organic wastewater into a beaker, add 0.3g of sodium naphthalenesulfonate, a coal-water slurry additive, and stir until homogeneous. While stirring, slowly add 156g of coal powder to prepare the coal-water slurry. Measure its viscosity and observe its flowability.

[0051] Example 8

[0052] 1) Weigh 1.42g of methylnaphthalene and add it to 9.48g of potassium permanganate for a mixed reaction. Extract with diethyl ether to obtain naphthoic acid. Under an anhydrous and oxygen-free environment, add ethylene oxide and propylene oxide in a molar ratio of 5:5 for an addition reaction to obtain… Add an appropriate amount of concentrated sulfuric acid and react to obtain Adding sodium hydroxide to neutralize the reaction yields a viscosity reducer. Dissolve 0.1g of viscosity reducer in water to prepare a viscosity reducer solution with a concentration of 0.1%.

[0053] 2) Take 95g of the above viscosity reducer solution into a beaker, add 5g of aniline tar, stir evenly at room temperature to obtain viscosity-reducing organic wastewater.

[0054] 3) Take 99.7g of the reduced-viscosity high-viscosity organic wastewater into a beaker, add 0.3g of sodium naphthalenesulfonate, a coal-water slurry additive, and stir until homogeneous. While stirring, slowly add 156g of coal powder to prepare the coal-water slurry. Measure its viscosity and observe its flowability.

[0055] Example 9

[0056] 1) Weigh 1.42g of methylnaphthalene and add it to 9.48g of potassium permanganate for a mixed reaction. Extract with diethyl ether to obtain naphthoic acid. Under an anhydrous and oxygen-free environment, add ethylene oxide and propylene oxide in a molar ratio of 6:4 for an addition reaction to obtain… Add an appropriate amount of concentrated sulfuric acid and react to obtain Adding sodium hydroxide to neutralize the reaction yields a viscosity reducer. Dissolve 0.1g of viscosity reducer in water to prepare a viscosity reducer solution with a concentration of 0.1%.

[0057] 2) Take 95g of the above viscosity reducer solution into a beaker, add 5g of aniline tar, place it in an oven at 80℃, let it stand for 24 hours, and then stir it evenly to obtain viscosity-reducing organic wastewater.

[0058] 3) Take 99.7g of the reduced-viscosity high-viscosity organic wastewater into a beaker, add 0.3g of sodium naphthalenesulfonate, a coal-water slurry additive, and stir until homogeneous. While stirring, slowly add 156g of coal powder to prepare the coal-water slurry. Measure its viscosity and observe its flowability.

[0059] Example 10

[0060] 1) Weigh 1.42g of methylnaphthalene and add it to 9.48g of potassium permanganate for a mixed reaction. Extract with diethyl ether to obtain naphthoic acid. Under an anhydrous and oxygen-free environment, add ethylene oxide and propylene oxide in a molar ratio of 7:3 for an addition reaction to obtain… Add an appropriate amount of concentrated sulfuric acid and react to obtain Adding sodium hydroxide to neutralize the reaction yields a viscosity reducer. Dissolve 0.1g of viscosity reducer in water to prepare a viscosity reducer solution with a concentration of 0.1%.

[0061] 2) Take 95g of the above viscosity reducer solution into a beaker, add 5g of aniline tar, stir evenly at room temperature to obtain viscosity-reducing organic wastewater.

[0062] 3) Take 99.7g of the reduced-viscosity high-viscosity organic wastewater into a beaker, add 0.3g of sodium naphthalenesulfonate, a coal-water slurry additive, and stir until homogeneous. While stirring, slowly add 156g of coal powder to prepare the coal-water slurry. Measure its viscosity and observe its flowability.

[0063] Example 11

[0064] 1) Weigh 1.42g of methylnaphthalene and add it to 9.48g of potassium permanganate for a mixed reaction. Extract with diethyl ether to obtain naphthoic acid. Under an anhydrous and oxygen-free environment, add ethylene oxide and propylene oxide in a molar ratio of 3:7 for an addition reaction to obtain… Add an appropriate amount of concentrated sulfuric acid and react to obtain Adding sodium hydroxide to neutralize the reaction yields a viscosity reducer. Dissolve 0.1g of viscosity reducer in water to prepare a viscosity reducer solution with a concentration of 0.1%.

[0065] 2) Take 95g of the above viscosity reducer solution into a beaker, add 5g of aniline tar, stir evenly at room temperature to obtain viscosity-reducing organic wastewater.

[0066] 3) Take 99.6g of the reduced-viscosity high-viscosity organic wastewater into a beaker, add 0.4g of sodium naphthalenesulfonate, a coal-water slurry additive, and stir until homogeneous. While stirring, slowly add 156g of coal powder to prepare the coal-water slurry. Measure its viscosity and observe its flowability.

[0067] Example 12

[0068] 1) Weigh 1.42g of methylnaphthalene and add it to 9.48g of potassium permanganate for a mixed reaction. Extract with diethyl ether to obtain naphthoic acid. Under an anhydrous and oxygen-free environment, add ethylene oxide and propylene oxide in a molar ratio of 4:6 for an addition reaction to obtain… Add an appropriate amount of concentrated sulfuric acid and react to obtain Adding sodium hydroxide to neutralize the reaction yields a viscosity reducer. Dissolve 0.1g of viscosity reducer in water to prepare a viscosity reducer solution with a concentration of 0.1%.

[0069] 2) Take 95g of the above viscosity reducer solution into a beaker, add 5g of aniline tar, stir evenly at room temperature to obtain viscosity-reducing organic wastewater.

[0070] 3) Take 99.6g of the reduced-viscosity high-viscosity organic wastewater into a beaker, add 0.4g of sodium naphthalenesulfonate, a coal-water slurry additive, and stir until homogeneous. While stirring, slowly add 156g of coal powder to prepare the coal-water slurry. Measure its viscosity and observe its flowability.

[0071] Example 13

[0072] 1) Weigh 1.42g of methylnaphthalene and add it to 9.48g of potassium permanganate for a mixed reaction. Extract with diethyl ether to obtain naphthoic acid. Under an anhydrous and oxygen-free environment, add ethylene oxide and propylene oxide in a molar ratio of 5:5 for an addition reaction to obtain… Add an appropriate amount of concentrated sulfuric acid and react to obtain Adding sodium hydroxide to neutralize the reaction yields a viscosity reducer. Dissolve 0.1g of viscosity reducer in water to prepare a viscosity reducer solution with a concentration of 0.1%.

[0073] 2) Take 95g of the above viscosity reducer solution into a beaker, add 5g of aniline tar, stir evenly at room temperature to obtain viscosity-reducing organic wastewater.

[0074] 3) Take 99.6g of the reduced-viscosity high-viscosity organic wastewater into a beaker, add 0.4g of sodium naphthalenesulfonate, a coal-water slurry additive, and stir until homogeneous. While stirring, slowly add 156g of coal powder to prepare the coal-water slurry. Measure its viscosity and observe its flowability.

[0075] Example 14

[0076] 1) Weigh 1.42g of methylnaphthalene and add it to 9.48g of potassium permanganate for a mixed reaction. Extract with diethyl ether to obtain naphthoic acid. Under an anhydrous and oxygen-free environment, add ethylene oxide and propylene oxide in a molar ratio of 6:4 for an addition reaction to obtain… Add an appropriate amount of concentrated sulfuric acid and react to obtain Adding sodium hydroxide to neutralize the reaction yields a viscosity reducer. Dissolve 0.1g of viscosity reducer in water to prepare a viscosity reducer solution with a concentration of 0.1%.

[0077] 2) Take 95g of the above viscosity reducer solution into a beaker, add 5g of aniline tar, stir evenly at room temperature to obtain viscosity-reducing organic wastewater.

[0078] 3) Take 99.6g of the reduced-viscosity high-viscosity organic wastewater into a beaker, add 0.4g of sodium naphthalenesulfonate, a coal-water slurry additive, and stir until homogeneous. While stirring, slowly add 156g of coal powder to prepare the coal-water slurry. Measure its viscosity and observe its flowability.

[0079] Example 15

[0080] 1) Weigh 1.42g of methylnaphthalene and add it to 9.48g of potassium permanganate for a mixed reaction. Extract with diethyl ether to obtain naphthoic acid. Under an anhydrous and oxygen-free environment, add ethylene oxide and propylene oxide in a molar ratio of 7:3 for an addition reaction to obtain… Add an appropriate amount of concentrated sulfuric acid and react to obtain Adding sodium hydroxide to neutralize the reaction yields a viscosity reducer. Dissolve 0.1g of viscosity reducer in water to prepare a viscosity reducer solution with a concentration of 0.1%.

[0081] 2) Take 95g of the above viscosity reducer solution into a beaker, add 5g of aniline tar, stir evenly at room temperature to obtain viscosity-reducing organic wastewater.

[0082] 3) Take 99.6g of the reduced-viscosity high-viscosity organic wastewater into a beaker, add 0.4g of sodium naphthalenesulfonate, a coal-water slurry additive, and stir until homogeneous. While stirring, slowly add 156g of coal powder to prepare the coal-water slurry. Measure its viscosity and observe its flowability.

[0083] Example 16

[0084] 1) Weigh 1.42g of methylnaphthalene and add it to 9.48g of potassium permanganate for a mixed reaction. Extract with diethyl ether to obtain naphthoic acid. Under an anhydrous and oxygen-free environment, add ethylene oxide and propylene oxide in a molar ratio of 5:5 for an addition reaction to obtain… Add an appropriate amount of concentrated sulfuric acid and react to obtain Adding sodium hydroxide to neutralize the reaction yields a viscosity reducer. Dissolve 0.1g of viscosity reducer in water to prepare a viscosity reducer solution with a concentration of 0.1%.

[0085] 2) Take 95g of the above viscosity reducer solution into a beaker, add 5g of aniline tar, stir evenly at room temperature to obtain viscosity-reducing organic wastewater.

[0086] 3) Take 99.6g of the reduced-viscosity high-viscosity organic wastewater into a beaker, add 0.4g of sodium naphthalenesulfonate, a coal-water slurry additive, and stir until homogeneous. While stirring, slowly add 163g of coal powder to prepare the coal-water slurry. Measure its viscosity and observe its flowability.

[0087] Example 17

[0088] 1) Weigh 1.42g of methylnaphthalene and add it to 9.48g of potassium permanganate for a mixed reaction. Extract with diethyl ether to obtain naphthoic acid. Under an anhydrous and oxygen-free environment, add ethylene oxide and propylene oxide in a molar ratio of 5:5 for an addition reaction to obtain… Add an appropriate amount of concentrated sulfuric acid and react to obtain Adding sodium hydroxide to neutralize the reaction yields a viscosity reducer. Dissolve 0.1g of viscosity reducer in water to prepare a viscosity reducer solution with a concentration of 0.1%.

[0089] 2) Take 95g of the above viscosity reducer solution into a beaker, add 5g of aniline tar, stir evenly at room temperature to obtain viscosity-reducing organic wastewater.

[0090] 3) Take 99.6g of the reduced-viscosity high-viscosity organic wastewater into a beaker, add 0.4g of sodium naphthalenesulfonate, a coal-water slurry additive, and stir until homogeneous. While stirring, slowly add 170g of coal powder to prepare the coal-water slurry. Measure its viscosity and observe its flowability.

[0091] Figure 1 The infrared spectrum of the viscosity reducer prepared in this invention is shown at 3400 cm⁻¹. -1 The nearby absorption peak is CH on the naphthalene ring, at 2900 cm⁻¹. -1 The nearby absorption peaks are vibrational absorption peaks of methyl and methylene groups, at 1650 cm⁻¹. -1 The nearby absorption peak is a vibrational absorption peak of the carbonyl group, at 1500 cm⁻¹. -1 The absorption peak near 1200 cm⁻¹ is due to the conjugate C=C. -1 The nearby absorption peak is -COC-, at 1000 cm⁻¹ -1 The nearby absorption peaks are sulfonyl vibration absorption peaks. Based on the above analysis, it is confirmed that the target product has been synthesized.

[0092] Table 1 shows a comparison of the viscosity of the viscosity-reducing wastewater prepared by the addition reaction of naphthoic acid obtained from methyl naphthalene oxide with ethylene oxide and propylene oxide in different molar ratios, as shown below. The viscosity of the aniline tar in the organic wastewater before viscosity reduction was approximately 12000 cp.

[0093] Table 1

[0094]

[0095] Table 2 shows a comparison of the viscosity of coal-water slurry prepared with additives at a ratio of 0.2% in Examples 1-5, 0.3% in Examples 6-10, and 0.4% in Examples 11-15, as shown below.

[0096] Table 2

[0097]

[0098] Table 3 is a comparison table of the performance of coal-water slurries with different slurry concentrations prepared in Examples 13, 16 and 17 of the present invention, as shown below.

[0099] Table 3

[0100]

[0101] Note: Liquidity A - Smooth flow, uninterrupted; B - Flow is not smooth, intermittent; C - Cannot flow downwards on its own, requires external force; D - Severe clumping phenomenon.

Claims

1. A method for preparing coal water slurry from high viscosity organic wastewater with viscosity reducing agent, characterized in that, The method comprises the following steps: (1) preparing a viscosity reducer into a solution; (2) viscosity reduction of high-viscosity organic wastewater: mixing the viscosity reducer solution and the high-viscosity organic wastewater, stirring uniformly at room temperature, and then mechanically stirring to obtain viscosity-reduced organic wastewater; (3) preparation of coal water slurry: taking the viscosity-reduced organic wastewater, adding a coal water slurry additive, and stirring while adding coal powder; The viscosity reducer is prepared by addition reaction of naphthalene carboxylic acid with ethylene oxide and propylene oxide, addition of appropriate concentrated sulfuric acid, and neutralization reaction with sodium hydroxide, wherein the molar ratio of ethylene oxide to propylene oxide is 3:7~7:3 based on the molar amount of naphthalene carboxylic acid; The high-viscosity organic wastewater is aniline tar; The coal water slurry additive is sodium naphthalene sulfonate; The amount of the viscosity reducer is 0.1%~0.5% of the mass of the organic wastewater.

2. The process for preparing coal water slurry from organic waste water with viscosity reduction and high viscosity as claimed in claim 1 wherein, The viscosity of the high-viscosity organic wastewater is 10000~20000cp. ​ 3. The process for preparing coal water slurry from organic waste water with viscosity reduction and high viscosity as claimed in claim 1 wherein, The content of the high-viscosity organic wastewater in the viscosity-reduced organic wastewater is 5~10%. ​ 4. The process for preparing coal water slurry from organic waste water with viscosity reduction and high viscosity as claimed in claim 1 wherein, The amount of the coal water slurry additive is 0.2%~0.4% of the total mass of the viscosity-reduced organic wastewater and the coal water slurry additive. ​ 5. The process for preparing coal water slurry from organic waste water with viscosity reduction and high viscosity as claimed in claim 1 wherein, The amount of the coal powder is 61%~64% of the total mass of the raw materials. ​

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