Modified sodium lignin sulfonate and application thereof as cement grinding aid

A technology of sodium lignosulfonate and lignin, which is applied to modified sodium lignosulfonate and its application field as a cement grinding aid, can solve the problem of low molecular utilization efficiency, low adsorption coverage, poor grinding aid performance, etc. It can solve the problem of waste residue pollution, reduce environmental pollution, and achieve the effect of low cost.

Inactive Publication Date: 2013-04-10
NANJING UNIV OF TECH
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AI Technical Summary

Benefits of technology

This patented technology provides an improved way to make better quality alkali metal sulfonates by modifying them chemically or through yeast cell culture techniques. It simplifies the production processes while also reducing costs compared to existing methods. Additionally, it uses recycled alcohol-fermented wastes from industrial sources instead of fossil fuels that cause harmful emissions during their combustion process. Overall, this innovative technical solution improves efficiency and economics over current options without causing negative side reactions like greenhouse gas emission.

Problems solved by technology

This patented technology describes how different types of substances called lignins or phenols may help enhance the properties of cements when they harden. By chemically modifying these substances, we found out better ways to use them without affecting their original function. Overall, this innovative approach helps create stronger cams while minimizing costs associated with traditional methods such as milling.

Method used

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  • Modified sodium lignin sulfonate and application thereof as cement grinding aid
  • Modified sodium lignin sulfonate and application thereof as cement grinding aid

Examples

Experimental program
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Effect test

Embodiment 1

[0018] This example illustrates the structural difference between modified sodium lignosulfonate and traditional sodium lignosulfonate. figure 1 IR spectra of modified lignosulfonate products are illustrated.

[0019] Modified product lignosulfonate at 1598 cm -1 、1514 cm -1 There are typical aromatic ring vibration absorption peaks; at 1457cm -1 Asymmetric C—O bond deformation occurs; at 3342 cm -1 O—H stretching absorption peaks appeared, and these typical absorption peaks indicated that the modified product still had the structure of lignin. It can also be seen from Figure 10 that the modified product is at 1370 cm -1 The syringyl absorption peak appeared, indicating that the syringyl content increased after modification. 1042 cm -1 is the stretching vibration peak of sulfonic acid group, 531 cm -1 The place is the characteristic peak of lignosulfonate in the infrared spectrum fingerprint area, and lignosulfonate has an absorption peak here, indicating that after the...

Embodiment 2

[0021] This example illustrates the specific synthesis method and modification method of sodium lignosulfonate. The method uses corn stalks steamed and exploded and then enzymatically hydrolyzed and fermented to produce cellulose ethanol waste residue as a raw material, and is prepared through the following reaction steps:

[0022] (1) Collect 100 parts of cellulose ethanol waste residue and add water to mix, control the solid content to 30%, add 10% sodium hydroxide solution, stir at 60 for 0.2h, and filter to obtain the filtrate;

[0023] (2) Add 1 part of anhydrous sodium sulfate and 0.1 part of ferric chloride to the filtrate, adjust the reaction pH to 10 with sodium hydroxide solution, and react at 80°C for 4 hours to obtain reaction solution 1;

[0024] (3) Cool the reaction solution 1 to 25°C, control the pH to 10, add 5 parts of formaldehyde solution to the reaction solution at a constant speed, react for 1 hour, and cool to room temperature to obtain the product stock...

Embodiment 3

[0026] This example illustrates another synthesis method and modification method of sodium lignosulfonate. One of the contents of the present invention is to provide a method for producing modified sodium lignosulfonate. The method uses corn stalks to be steamed and exploded and then enzymatically hydrolyzed and fermented to produce cellulose ethanol waste residue as a raw material, and is prepared through the following reaction steps:

[0027] (1) Collect 100 parts of cellulose ethanol waste residue and add water to mix, control the solid content to 75%, add 20% sodium hydroxide solution, stir at 90°C for 1 hour, and filter to obtain the filtrate;

[0028] (2) Add 10 parts of anhydrous sodium sulfate and 1 part of ferric chloride to the filtrate, adjust the reaction pH to 11, react at 90°C for 5 hours, and obtain reaction solution 1;

[0029] (3) Cool the reaction solution 1 to 45°C, control the pH to 11, add 10 parts of formaldehyde solution to the reaction solution at a con...

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Abstract

The invention provides a novel preparation method of modified sodium lignin sulfonate, and aims at solving defects of the traditional sodium lignin sulfonate used as a cement grinding aid and a synthetic method in the prior art. A good effect of the cement grinding aid in application is found. According to the method, cellulosic ethanol waste residue is taken as a raw material, the modified sodium lignin sulfonate is obtained through reactions such as dissolution, sulfonation reaction and modification. According to the invention, the obtained modified sodium lignin sulfonate has a grinding assisting function on the cement at a low adding quantity. According to the invention, product raw materials come from waste cellulosic ethanol waste residues, a waste residue pollution problem is solved, a production process is simple, convenient and workable, and as the cement grinding aid, the product has a better grinding assisting effect than the prior art.

Description

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Claims

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Application Information

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Owner NANJING UNIV OF TECH
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