A kind of environment-friendly coal-water slurry additive for low-rank coal pulping and preparation method thereof

An environmentally friendly, coal-water slurry technology, applied in the field of coal chemical industry, can solve the problems of low slurry concentration and difficulty in slurry formation, and achieve high slurry concentration, excellent fluidity and stability, and mild sulfonation reaction conditions Effect

Active Publication Date: 2020-09-04
南京楠达环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for low-rank coal, the internal water exceeds 10%, and the slurrying property is very difficult. The slurrying concentration is very low when using common additives on the market.

Method used

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  • A kind of environment-friendly coal-water slurry additive for low-rank coal pulping and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method for an environment-friendly coal-water slurry additive for low-rank coal slurrying, comprising the following steps:

[0026] The following parts are all parts by mass,

[0027] A. Preheat the reaction device to 90°C, add 1.3 parts of industrial naphthalene, heat to 130°C, stir evenly, and gradually add 1.6 parts of concentrated sulfuric acid dropwise;

[0028] B. Add 0.6 parts of water, adjust the acidity to 28%, and control the temperature at 120°C;

[0029] C. Add 0.14 parts of styrenesulfonic acid and 0.14 parts of acrylate, stir evenly, and gradually add 0.8 parts of formaldehyde dropwise;

[0030] D. Add alkali to neutralize to a pH value of 11, add water to cool to room temperature, and obtain a methylene naphthalene sulfonate-styrene sulfonate-acrylate polymer condensation material with a concentration of 40wt%, for subsequent use;

[0031] E. Add lignosulfonate to the mixing device for stirring, then add methylene naphthalene sulfonate-sty...

Embodiment 2

[0037] This embodiment is improved on the basis of Embodiment 1.

[0038] In step A, after the industrial naphthalene is added and the industrial naphthalene is melted, a pretreatment gas is introduced into the industrial naphthalene. The pretreatment gas contains 30wt% sulfur trioxide and 70wt% nitrogen, and the temperature is maintained at 90°C for 30 minutes.

[0039] In this example, prior to the high-temperature sulfonation reaction using concentrated sulfuric acid, low-temperature sulfonation pretreatment was performed on industrial naphthalene with sulfur trioxide. Since the low-temperature sulfonation process can reduce the combination number of sulfo groups and aromatic rings, thereby promoting the hydrolysis in step B.

Embodiment 3

[0041] This embodiment is improved on the basis of Embodiment 2.

[0042] In step B, the amount of water used for the reaction is continuously added linearly, and at the same time, the pressure is gradually increased in the reaction device, the pressure is 3.5-4.5 bar, and the rate of pressure increase is linearly related to the rate of water addition.

[0043] In this embodiment, by adopting the reaction method of high pressure hydrolysis, the reverse reaction of hydrolysis can be effectively reduced, and the pressure increases linearly with the addition of water, which can avoid the influence of pressure fluctuation on the balance of hydrolysis reaction.

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Abstract

The invention discloses a preparation method of an environment-friendly water-coal-slurry additive for low-rank coal slurrying. The method comprises the following steps that 1, a reaction device is heated to 90 DEG C in advance, 1.2-1.5 parts of crude naphthalene is added, a mixture is heated to 130 DEG C, and is stirred evenly, and 1.3-1.6 parts of concentrated sulfuric acid is added dropwise; 2,0.4-0.6 part of water is added, the acidity is adjusted to be 28-30%, and a temperature is controlled at 110-120 DEG C; 3, 0.12-0.15 part of styrene sulfonic acid and 0.12-0.15 part of acrylic esterare added, and 0.8-1 part of formaldehyde is added dropwise; 4, alkali is added for neutralization until a PH value is 10-11, water is added for cooling a mixture to room temperature, and a methylenenaphthalene sulfonate-styrene sulfonate-acrylic ester high-molecular polymer condensation material with a concentration of 40wt% is obtained for later use; 5, lignosulfonate is added into a mixing device for stirring, and then the methylene naphthalene sulfonate-styrene sulfonate-acrylic ester high-molecular polymer condensation material is added into the mixing device. By means of the preparationmethod of the environment-friendly water-coal-slurry additive for low-rank coal slurrying, the defects in the prior art can be overcome, and the preparation method of the environment-friendly water-coal-slurry additive for low-rank coal slurrying has good adaptability to low-rank coal water-coal-slurry preparation.

Description

technical field [0001] The invention relates to the technical field of coal chemical industry, in particular to an environment-friendly coal-water slurry additive for low-rank coal slurrying and a preparation method thereof. Background technique [0002] At present, the entrained-bed gasification process is the main gas-making process adopted in the modern coal chemical industry, and the coal-water slurry gasification process is the most widely used one in the entrained-bed gasification process. In normal use, it has low viscosity, good fluidity, high stability, and is not easy to produce precipitation. Adding a small amount of chemical additives in the pulping process—coal-water slurry additives is essential. The amount of additives varies according to the slurry-forming properties of the coal, and usually accounts for about 1 to 6% of the coal. For coals with a high degree of coalification, the slurry-forming properties can meet the requirements by adding common coal-wate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L1/24C10L1/32
CPCC10L1/24C10L1/2437C10L1/2475C10L1/326
Inventor 笪洪军沈浩史建辉
Owner 南京楠达环保科技有限公司
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