Method for preparing dispersing-stabilizing agent by using papermaking sludge

A technology of papermaking sludge and stabilizer, which is applied in the chemical field to achieve the effects of improving utilization rate, mild reaction conditions and reducing discharge

Active Publication Date: 2013-11-27
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method for preparing dispersing-stabilizing agent by using papermaking sludge
  • Method for preparing dispersing-stabilizing agent by using papermaking sludge
  • Method for preparing dispersing-stabilizing agent by using papermaking sludge

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Embodiment 1

[0030] Example 1. Method of the invention - two-step sulfonation of lignin and carboxymethylation of cellulose

[0031] Take 10g of papermaking sludge, add 100ml of deionized water, add dropwise 10% NaOH solution while stirring, control the pH value at about 11.5, about half an hour, and pour it into the reactor after the pH=11.5 remains unchanged. Heat the reactor water bath to 90°C, add 2.5g of anhydrous sodium sulfite, stir, react for 2h, adjust the temperature to 60°C, slowly add 1.0ml of 30% hydrogen peroxide solution dropwise, stir, and react for 20min. Adjust the temperature back to 90°C, add a condenser, add 5.5ml of 37% formaldehyde solution dropwise, stir, react for 1h, then add 3.0g of anhydrous sodium sulfite, react for 3h, lower the temperature to 35°C, add 2.3g of monochloroacetic acid, After stirring for 2.5 hours, the product was dried at 70°C and crushed. A dispersant-stabilizer containing sodium lignosulfonate-sodium carboxymethylcellulose, code-named SL 2 ...

Embodiment 2

[0032] Embodiment 2. One-step sulfonation of lignin in raw materials:

[0033] Take 10g of papermaking sludge, add 100ml of deionized water, add dropwise 10% NaOH solution while stirring, control the pH value at about 11.5, about half an hour, and pour it into the reactor after the pH=11.5 remains unchanged. Heat the reactor water bath to 90°C, add 2.5g of anhydrous sodium sulfite, stir, react for 2h, dry the product at 70°C, and pulverize. The one-step sulfonation product of lignin in this example is used as a comparative example, code-named SL 1 .

Embodiment 3

[0034] Example 3. Two-step sulfonation of lignin in raw materials:

[0035] Take 10g of papermaking sludge, add 100ml of deionized water, add dropwise 10% NaOH solution while stirring, control the pH value at about 11.5, about half an hour, and pour it into the reactor after the pH=11.5 remains unchanged. Heat the reactor water bath to 90°C, add 2.5g of anhydrous sodium sulfite, stir, react for 2h, adjust the temperature to 60°C, slowly add 1.0ml of 30% hydrogen peroxide solution dropwise, stir, and react for 20min. Adjust the temperature back to 90°C, add a condenser, add 5.5ml of 37% formaldehyde solution dropwise, stir, react for 1h, then add 3.0g of anhydrous sodium sulfite, react for 3h to obtain the product, dry at 70°C, and pulverize. The two-step sulfonation product of lignin in this example is used as a comparative example, code-named SL 2 .

[0036] The product of embodiment 1-3 is joined in the coal-water slurry and carries out stability, water analysis property, ...

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Abstract

The invention relates to a method for preparing a dispersing-stabilizing agent by using papermaking sludge, which comprises directly dropping NaOH solution in raw materials which are not processed and adding anhydrous sodium sulfite to react for 1.5-2h when temperature rises to 90 DEG C; adding hydrogen peroxide, formaldehyde solution and the anhydrous sodium sulfite for reaction; and finally adding monochloro acetic acid to blend for 2-3h to obtain the dispersing-stabilizing agent containing sodium lignin sulfonate-sodium carboxymethylcellulose. Obtained products have good disperse stability and enable concentration of water-coal-slurry to achieve 67% when using in the water-coal-slurry, viscosity is below 1100mPa*s, no hard sediment is generated after the products are placed for 72h, and mobility is good. The method is simple in process and soft in reaction condition, achieves reutilization of waste, and is capable of being used in industries of water-coal-slurry preparation, oil fields, cement manufacture and the like.

Description

technical field [0001] The invention relates to a method for synthesizing a dispersing-stabilizer by using alkali lignin and cellulose in alkali papermaking sludge, and belongs to the technical field of chemistry. Background technique [0002] Both dispersants and stabilizers are surfactants that can increase the stability of solutions, colloids, solids, and mixtures, and are widely used in coal water slurry, oil fields, food, coatings and other industries. Dispersants and stabilizers currently used in the market mainly include carboxylate salts, sulfate ester salts, sulfonate salts, polyethylene glycol polyols and polyethyleneimine derivatives, carboxymethyl cellulose salts, and the like. Sodium lignosulfonate and sodium carboxymethylcellulose are the products of sulfonation and carboxymethylation of lignin and cellulose respectively. Due to their high-efficiency dispersion and stability, the raw materials are abundant and non-toxic, and their application range Relatively ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01F17/56B01F17/50C09K23/56C09K23/50
Inventor 高宝玉荣红岩王燕岳钦艳赵艳侠黄理辉
Owner SHANDONG UNIV
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