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Preparation method of polyhydric aldehyde cross-linked sulfomethylated humic acid coal-water slurry dispersant

A technology of sulfomethylation and humic acid, applied in the field of coal-water slurry dispersant, can solve the problems of unsatisfactory stability of coal-water slurry, low molecular mass, complicated process of humic acid dispersant, etc. Electrostatic repulsion, effect of reducing apparent viscosity

Inactive Publication Date: 2015-12-02
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chen Qinsheng invented a humic acid compound type coal water slurry additive, which is prepared by mixing and heating papermaking black liquor, peat, and humic acid (ZL01141319.0); Zhang Guanghua wrote in the literature [Coal conversion, 2013] introduced a modification method of a new type of humic acid-based coal-water slurry dispersant, which can improve the slurry concentration and stability when it is used to prepare coal-water slurry, but the humic acid dispersion prepared by the above modification method The preparation process is complex, and the stability of the prepared coal water slurry is still not ideal due to the relatively small molecular weight

Method used

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  • Preparation method of polyhydric aldehyde cross-linked sulfomethylated humic acid coal-water slurry dispersant

Examples

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Comparison scheme
Effect test

Embodiment 1

[0016] In parts by mass, dissolve 50 parts of sodium humate in 150 parts of water to obtain mixture A, adjust the pH of mixture A to 10 with a mass fraction of 10% aqueous sodium hydroxide solution to obtain mixture B, and add 45 parts of mass to mixture B Formaldehyde solution with a fraction of 37% was obtained as a mixture C. After the temperature of the mixture C was raised to 55°C, 37.5 parts of sodium bisulfite was added to the mixture C under stirring, and then kept for 4 hours to obtain a material A. Then, within 30 minutes, 35 parts of Add a 20% aqueous solution of glyoxal to material A and conduct heat preservation and cross-linking reaction for 3 hours to obtain material B. After the reaction, the material is discharged, and the material B is spray-dried with hot air (130°C) to obtain a brown powder.

Embodiment 2

[0018] In parts by mass, dissolve 50 parts of potassium humate in 120 parts of water to obtain mixture A, adjust the pH of mixture A to 11 with a mass fraction of 10% aqueous sodium hydroxide solution to obtain mixture B, and add 35 parts of mass to mixture B Formaldehyde solution with a fraction of 37% was obtained as mixture C. After the mixture C was heated to 55°C, 45 parts of sodium bisulfite was added to the mixture C under stirring, and then kept for 4 hours to obtain material A. Then, within 30 minutes, 25 parts by mass Add 20% aqueous solution of glutaraldehyde to material A and conduct heat preservation cross-linking reaction for 2 hours to obtain material B. After the reaction, the material is discharged, and the material B is spray-dried with hot air (140°C) to obtain a brown powder.

Embodiment 3

[0020] In terms of parts by mass, dissolve 50 parts of ammonium humate in 100 parts of water to obtain mixture A, adjust the pH of mixture A to 12 with a mass fraction of 10% aqueous sodium hydroxide solution to obtain mixture B, and add 25 parts by mass to mixture B Formaldehyde solution with a fraction of 37% was obtained as mixture C. After the temperature of mixture C was raised to 60°C, 52.5 parts of sodium bisulfite was added to mixture C under stirring, and then kept for 4 hours to obtain material A, and 25 parts by mass of Add a 20% aqueous solution of glyoxal to material A and conduct heat preservation and cross-linking reaction for 3 hours to obtain material B. After the reaction, the material is discharged, and the material B is spray-dried with hot air (180°C) to obtain a brown powder.

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Abstract

The invention provides a preparation method of a polyaldehyde crosslinked sulfomethylated humate coal water slurry dispersant, which comprises the following steps of dissolving humate into water, adjusting the pH value of the obtained object to be 10-12 by using a sodium hydroxide solution, adding a formaldehyde solution, heating the obtained product to 55-70 DEG C, adding sodium bisulfite while stirring, carrying out a constant temperature reaction for 3-4 h, dropwise adding a dialdehyde aqueous solution, carrying out a crosslinking reaction on the obtained object for 2-3 h, and after the obtained product is discharged, drying the obtained product so as to obtain a polyaldehyde crosslinked sulfomethylated humate coal water slurry dispersant. In the dispersant prepared according to the invention, sulfo groups are introduced in a humate molecule substrate, and intermolecular moderate crosslinking is performed by using dialdehyde so as to increase the molecular weight thereof, thereby facilitating the increasing of a steric hindrance function of the dispersant after being adsorbed on the surfaces of coal particles. The preparation method disclosed by the invention is wide in used raw material source, simple in process and less in application amount, and can significantly improve the stability of coal water slurry.

Description

technical field [0001] The invention belongs to the technical field of coal-water slurry dispersant, and in particular relates to a preparation method of polyhydric aldehyde cross-linked sulfomethylated humic acid coal-water slurry dispersant. Background technique [0002] Coal water slurry is a new type of liquid fuel that replaces oil with coal. It is a stable solid-liquid system formed by mixing and uniformly dispersing about 70% coal, about 30% water and about 1% dispersant. , it retains the original properties of coal such as flammability and reducibility. The dispersant in the preparation of coal-water slurry plays a key role. A small amount of dispersant can make the fusion of water and coal better, reduce the viscosity, and improve the dispersion stability and fluidity of the coal-water slurry. At present, the coal water slurry dispersant includes compound products of naphthalene series, lignin series, polycarboxylate series and related components. The widely used ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H99/00C07G99/00C08J3/24C10L1/32
Inventor 张光华卫颖菲李俊国牛育华屈倩倩朱军锋
Owner SHAANXI UNIV OF SCI & TECH
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