Synthesizing and using method of coal water slurry additive agent

A synthesis method and additive technology are applied in the field of preparing coal-water slurry with excellent performance, which can solve the problems of poor slurry stability and high price, and achieve the effects of good stability, improved performance and improved dispersion effect.

Inactive Publication Date: 2008-12-31
NANJING UNIV OF INFORMATION SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the shortcomings of the current polynaphthalene sulfonate series additives that are expensive and the stability of the prepared slurry is poor, the invention provides a synthetic method of a low-cost, stable prepared slurry additive for coal-water slurry, the steps are as follows:

Method used

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  • Synthesizing and using method of coal water slurry additive agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The synthetic method of coal water slurry additive, step is as follows:

[0017] A Synthesis of anthracene-based additives: first sulfonate crude anthracene, wherein the mass ratio of crude anthracene to concentrated sulfuric acid is 1:0.25-1, the sulfonation temperature is controlled at 90-150°C, the sulfonation reaction time is 2-4h, and then After hydrolysis for 0.5~1h, adjust the pH of the reaction solution to make the pH<3, and then condense with formaldehyde. The mass ratio of crude anthracene to formaldehyde is 1:0.05~0.2, and the condensation temperature is controlled at 100~120°C. and the anthracene-based additives are obtained; B, the polycondensation of sodium naphthalenesulfonate formaldehyde with a degree of polymerization of 10-15 and an average molecular weight of 2000-3500 and the anthracene-based additives prepared in step A are compounded according to a mass ratio of 1:0.2-2 Additives for coal water slurry.

[0018] The mass ratio of crude anthracene ...

Embodiment 2

[0020] Add 150g of crude anthracene to a 500ml four-neck flask, stir, heat until the temperature rises to 110°C, slowly add 40ml of concentrated sulfuric acid dropwise, react at 130°C for 3h, then cool to 120°C, and hydrolyze for 0.5h. Slowly add 10ml of formaldehyde solution into the flask at 100°C and react at 110°C for 1.5h. Neutralize the solution with NaOH to make the pH of the solution 7-9, dry and pulverize to obtain the anthracene additive. Use Xuzhou Pangzhuang coal to prepare coal-water slurry, keep the consumption of coal-water slurry additive as 1% of dry base coal powder, wherein the mass ratio of sodium naphthalenesulfonate formaldehyde polycondensate and the above-mentioned prepared anthracene series coal-water slurry additive is 1: 1. At 24°C, the shear rate is 100s -1 , when the viscosity of the slurry was 1200mPa.s, the concentration of the prepared slurry was 68.2%, and the slurry was stored for 7 days without obvious precipitation.

Embodiment 3

[0022] Substantially the same as in Example 2, by using the sulfonation reaction temperature and the sulfonation reaction time of changing the crude anthracene, concentrated H 2 SO 4 The amount of HCHO, the amount of HCHO and the condensation temperature synthesized anthracene additives for pulping, the concentration of the slurry is 65.5% to 67.4%, and some hard precipitates appear in the slurry after 7 days of storage.

[0023] Wherein the sulfonation temperature is set to 90°C or 110°C or 150°C, the sulfonation reaction time is shortened to 2h, H 2 SO 4 The consumption of HCHO is 30ml, the consumption of HCHO is 15ml, and the condensation temperature is 120°C.

[0024] Example 3:

[0025] In Example 2, other conditions remained unchanged, but the additive used was only sodium naphthalenesulfonate formaldehyde polycondensate, the concentration of the slurry was 68.4%, and hard precipitation occurred after the slurry was stored for 2 days.

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Abstract

The invention discloses a synthetic method for anthracene series coal water slurry additive, which comprises: sulfonation, hydrolysis, condensation and neutralization to crude anthracene. The crude anthracene and concentrated sulfuric acid are present in a mass ratio of 1:0.25 to 1, and the crude anthracene and formaldehyde are present in a mass ratio of 1:0.05 to 0.2; the sulfonation temperature is controlled at between 90 and 150DEG C, and the condensation temperature is controlled at between 100 and 120DEG C; and the sulfonation reaction time is 2 to 4h, and the hydrolysis time is 0.5 to 1h. A naphthalene sulphonic sodium formaldehyde polycondensate with the degree of polymerization ranging from 10 to 15 and average molecular weight of 2000 to 3500 is compounded with an anthracene series additive for being applied to coal water slurry preparation processes of different coal types, when the amount of the compound additive is 1 percent by weight of dry basis coal fines, the shear rate is kept at 100s<-1>, and when the slurry viscosity is 1200MPa.s, the coal water slurry with the concentration of 67.9 to 68.8 percent can be prepared, and the slurry has excellent stability. The combination of naphthalene sulphonic sodium formaldehyde polycondensate and anthracene series coal water slurry additive can prepare coal water slurry with excellent performance and reduce the production cost of additive in the meanwhile, and the compound additive has rather strong universality to the slurry making of different coal types.

Description

technical field [0001] The invention relates to a method for synthesizing and using a coal-water slurry additive, in particular to a coal-water slurry with excellent preparation performance. Background technique [0002] Coal-water slurry is a coal-based fluid fuel that replaces oil with coal that appeared in the 1980s. It is a coarse dispersion system composed of about 70% solid coal powder, about 30% water and about 1% of a small amount of chemical additives. Its fluidity, energy saving and low pollution during combustion, coal water slurry technology has been valued by countries all over the world. The ideal CWS is characterized by higher concentration, lower viscosity, good rheology and long-term stability. [0003] Excellent chemical additives are one of the key factors for preparing high-quality coal-water slurry. The main function of the coal water slurry additive is to change the surface properties of coal particles, promote the diffusion of coal particles in water...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L1/32
Inventor 郭照冰吴国光郑有飞唐登勇刘长春
Owner NANJING UNIV OF INFORMATION SCI & TECH
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