Amphoteric water-coal-slurry dispersing agent and preparation method thereof

Abstract

The invention provides an amphoteric water-coal-slurry dispersing agent and a preparation method thereof. The method comprises that: after polyethyleneglycol and polymerization inhibitor hydroquinone are mixed, acrylic acid, catalyst paratoluenesulfonic acid and a water-carrying agent dimethylbenzene are sequentially added to the mixture, are heated to react and are decompressed and distilled to obtain pale brown transparent liquid; the pale brown transparent liquid is adjusted to neutrality by Na2CO3 solution, is washed by saturated NaCl solution, and is extracted by 30ml aether to obtain an intermediate product I; deionized water, sulphonate or sulfoacid, cationic monomer and sodium bisulfate are stirred and dissolved; and the intermediate product I is dripped into persulfate aqueous solution to react to obtain polymer solution of an amphoteric ionic dispersing agent. The amphoteric water-coal-slurry dispersing agent synthesized by the preparation method introduces a long-chain group on the premise that the amphotericity of the dispersing agent is maintained, and can obviously improve the electric charge condition of coal particle surface so as to change the hydrophobic property of coal surface, thereby playing an excellent effect of viscosity reduction.

Description

technical field [0001] The invention relates to a coal-water slurry dispersant and a preparation method thereof, in particular to an amphoteric coal-water slurry dispersant and a preparation method thereof. Background technique [0002] Coal water slurry is a new type of clean fuel that uses physical methods to fluidize coal. It is prepared by adding a small amount of additives according to the ratio of 60% to 70% of coal and 30% to 40% of water. It transforms coal from a traditional solid fuel into a fluid fuel that can be pumped, atomized, stored and ignited stably like oil. Two tons of coal water slurry can replace one ton of oil. Since the price of coal-water slurry is only about 1 / 2 of that of heavy oil under the same calorific value as that of fuel oil, it has significant economic benefits to replace oil with coal-water slurry. Low viscosity, high concentration, good fluidity and stability are the most important properties of CWS. However, coal is a hydrophobic subs...

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Problems solved by technology

(4) Humic acid system: this kind of dispersant is extracted from low-rank coal, which has the advantage of good dispersion performance and can be used alone, but it is sensitive to metal ions, easy to form precipitation, and the stability of slurry is poor, so it is not suitable for pulping High water quality requirements

However, the compounding method cannot change the hydrophilic and lipophilic groups of lignosulfonate and its surface activity, and the compounding materials currently used are relatively expensive

[0005] Non-ionic dispersants: mainly polyoxyethylene ethers and polyoxyethylene / polyoxypropylene block polyethers. The main advantage of this type of dispersant is that the hydrophilic and lipophilic molecules and the relative molecular mass are easy to adjust and control. It is not affected by water quality and soluble matter in coal, and does not need to add stabilizers, but it is expensive, and it needs to be equipped with defoamers, and the flow pattern of coal water slurry is not very ideal.

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