Naphthalene-system coal water slurry dispersant and preparation method thereof

Abstract

The invention provides a naphthalene-system coal water slurry dispersant and a preparation method thereof. The method comprises steps that: 70 parts of naphthalene or naphthol are weighed and heated; 70 to 75 parts of concentrated sulfuric acid are dropped into the heated naphthalene or naphthol; the mixture is heated, and the temperature is maintained at 150 to 170 DEG C for 1.5 to 3.5 hours; lignin is added to the mixture, and the temperature of the mixture is reduced to 60 to 85 DEG C; 40 to 50 parts of 36% of a formaldehyde solution is dropped into the mixture; the mixture is heated, and the temperature is maintained at 90 to 110 DEG C for 3 to 6 hours; the temperature is then reduced to 50 to 80 DEG C; the pH value is regulated to 7 to 10, and a finished material can be discharged. The dispersant is a yellow brown viscous liquid with a solid content of 25 to 35%, a pH value of 7 to 10, a density of 1.12 to 1.22g / cm<3>, and a viscosity of 50 to 300mPa.s. Compared to a simple complex of napsylate condensation product and lignin, the dispersant provided by the invention has advantages of greatly improved effect, low cost, good dispersibility, long-lasting stationary phase, and the like.

Description

technical field [0001] The invention belongs to the field of coal-water slurry, and in particular relates to a naphthalene-based coal-water slurry dispersant and a preparation method thereof. Background technique [0002] Naphthalene sulfonate polycondensate dispersant has good dispersibility to coal particles and good matching with coal types, so it is a widely used dispersant in coal water slurry industry. However, the stability of the CWS prepared by this kind of dispersant is relatively poor, and the prepared CWS generally produces irreversible precipitation after being left for more than 2 days, has a high water separation rate, and has certain toxicity. In order to take advantage of the good dispersion performance of naphthalene-based dispersants and solve the shortcomings of poor stability, researchers have explored the following two solutions. [0003] 1) Used in combination with other dispersants or stabilizers. Naphthalene-based dispersants are generally used in ...

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Problems solved by technology

For example, polycondensation and sulfonation of naphthalene-based sulfonate and formaldehyde can synthesize a coal-water slurry dispersant with good performance. Acid copolymerization reaction to synthesize new type of high molecular polymer, which provides a new way for the development of coal water slurry dispersant; for example, Nanjing University, etc. use methylene naphthalene sulfonic acid, maleate and styrene sulfonic acid for polycondensation reaction Obtained NDF dispersant, its pulping dispersion stability effect is all good, is widely used in the market, but due to the high cost, the application is limited

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