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A kind of naphthalene series coal water slurry dispersant and preparation method thereof

A dispersant and coal-water slurry technology, which is applied in the field of naphthalene-based coal-water slurry dispersant and its preparation, can solve the problems of reducing the cost of dispersant, low addition amount, application restrictions, etc., and achieve low cost, enhanced effect, and stable period long effect

Inactive Publication Date: 2011-12-28
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • A kind of naphthalene series coal water slurry dispersant and preparation method thereof
  • A kind of naphthalene series coal water slurry dispersant and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0017] (1) Weigh 70 parts by mass of naphthalene and heat it to 130° C., and dropwise add 70 parts by mass of naphthalene with a mass fraction of 93% concentrated sulfuric acid in the heated naphthalene. The concentrated sulfuric acid is added dropwise within 30 minutes. After finishing the concentrated sulfuric acid, heat up and keep it at 150°C for 1.5h to obtain naphthalenesulfonate; (2) add 20 parts by mass of water after cooling the naphthalenesulfonate to 110°C, add water and keep it warm for 0.5h, and then use sulfuric acid to adjust the acidity to 25%, then add lignin and stir to obtain a mixture, the mass ratio of lignin and naphthalene sulfonate is 1: 1, and the stirring temperature is controlled at 70°C; (3) after the temperature of the mixture drops to 60°C, 40 parts by mass of formaldehyde solution with a mass fraction of 36% was added dropwise to the mixture to obtain a reaction material. The formaldehyde solution was added dropwise within 1 hour, and the temperat...

Embodiment 2

[0019] (1) Weigh 70 parts by mass of naphthalene and heat it to 130° C., and dropwise add 75 parts by mass of naphthalene with a mass fraction of 98% concentrated sulfuric acid in the heated naphthalene. The concentrated sulfuric acid is added dropwise within 30 minutes. After finishing the concentrated sulfuric acid, heat up and keep it at 170°C for 3.5h to obtain naphthalenesulfonate; (2) add 35 parts by mass of water after cooling the naphthalenesulfonate to 130°C, add water and keep it warm for 0.5h, and then use sulfuric acid to adjust the acidity to 30%, then add lignin and stir to obtain a mixture, the mass ratio of lignin and naphthalene sulfonate is 1: 4, and the temperature of stirring is controlled at 90°C; (3) after the temperature of the mixture drops to 85°C, 50 parts by mass of formaldehyde solution with a mass fraction of 36% was added dropwise to the mixture to obtain a reaction material. The formaldehyde solution was added dropwise within 1 hour, and the tempe...

Embodiment 3

[0021] (1) take by weighing the naphthol of 70 mass parts and be heated to 130 ℃, in the naphthol after heating dropwise the massfraction of 73 mass parts is the concentrated sulfuric acid of 96%, described concentrated sulfuric acid is added dropwise in 30min, After adding concentrated sulfuric acid dropwise, heat up and keep warm at 160°C for 2.5h to obtain naphthalenesulfonate; (2) cool down the naphthalenesulfonate to 120°C, add 30 parts by mass of water, add water and keep warm for 0.5h, and keep warm with sulfuric acid Adjust the acidity to 29%, then add lignin and stir to obtain a mixture, the mass ratio of lignin and naphthalenesulfonate is 1:3, and the stirring temperature is controlled at 80°C; (3) the temperature of the mixture is reduced to 70°C After that, 45 parts by mass of formaldehyde solution with a mass fraction of 36% was added dropwise to the mixture to obtain a reaction material. The formaldehyde solution was added dropwise within 1 hour, and the temperatu...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L1/24C10L1/198C10L1/185C10L1/32
Inventor 张光华朱军峰刘国俊魏辉
Owner SHAANXI UNIV OF SCI & TECH
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