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Microwave synthesis method for sulfonic group modified polyaspartic acid

A technology of polyaspartic acid and microwave synthesis, which is applied in chemical instruments and methods, water/sludge/sewage treatment, descaling and water softening, etc., which can solve unfavorable industrial production, long synthesis time, large energy consumption, etc. problems, to achieve excellent scale inhibition performance, fast synthesis speed, and high yield

Inactive Publication Date: 2011-08-17
ZHANJIANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods of modifying polyaspartic acid mainly use traditional heating techniques such as oil bath or ordinary electric heating, which takes a long time to synthesize, consumes a lot of energy, and is costly, which is not conducive to industrial production.

Method used

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  • Microwave synthesis method for sulfonic group modified polyaspartic acid

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Add 9.8 grams of maleic anhydride, 5.8 grams of ammonium carbonate, and 7.4 grams of sodium 2-aminoethanesulfonate into a beaker, mix well, add 20 mL of distilled water to make a paste, and irradiate for 5 minutes under the condition of microwave power 300W to obtain Brown-red fluffy solid substance. Add 25 mL of 2 mol / L NaOH solution to dissolve the above product, and irradiate it under 300W microwave conditions for 3 minutes to obtain a reddish-brown viscous sulfonic acid group-modified polyaspartic acid solution. Use hydrochloric acid with a concentration of 35% to 37% to adjust the pH of the above solution to 2 to 3, add this solution dropwise to 300mL of vigorously stirred anhydrous ethanol to obtain a brownish yellow precipitate, filter the precipitate under reduced pressure, and store at 60°C, Drying under a vacuum condition of 0.002 MPa gave 14.2 grams of sulfonic acid group-modified polyaspartic acid product, with a total yield of 94%.

Embodiment 2

[0021] Add 9.8 grams of maleic anhydride, 10 mL of distilled water, 6.7 grams of sodium sulfamate and 7.3 grams of 28% ammonia water in a beaker, and irradiate for 4 minutes under the condition of a microwave power of 400W to obtain a brownish red fluffy solid substance . Add 25 mL of 2 mol / L NaOH solution to dissolve the above product, and irradiate it under 300W microwave conditions for 3 minutes to obtain a reddish-brown viscous sulfonic acid group-modified polyaspartic acid aqueous solution. Use hydrochloric acid with a concentration of 35% to 37% to adjust the pH of the above solution to 2 to 3, add this solution dropwise to 300mL of vigorously stirred anhydrous ethanol to obtain a brownish yellow precipitate, filter the precipitate under reduced pressure, and store at 60°C, Drying under a vacuum condition of 0.002 MPa gave 13.3 grams of sulfonic acid group-modified polyaspartic acid product, with a total yield of 91%.

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Abstract

The invention discloses a microwave synthesis method for sulfonic group modified polyaspartic acid. The method comprises the following steps of: adding other sulfonate compounds containing amino groups into maleic anhydride and ammonia water or urea or ammonium salt which are taken main raw materials, radiating by using microwave with the power of between 200 and 800W to synthesize sulfonic groupmodified polysuccinimide, and further adding aqueous solution of inorganic base and hydrolyzing under microwave radiation conditions to obtain the sulfonic group modified polyaspartic acid. The sulfonic group modified polyaspartic acid prepared by the method has good functions of calcium carbonate and calcium phosphate scale inhibition and ferric oxide dispersion, and belongs to an environment-friendly circulating cooling water antiscale dispersant. The process is simple, synthesis speed is high, energy consumption is low, and the method is suitable for industrial production.

Description

technical field [0001] The invention belongs to the preparation technology of environment-friendly antiscalant polyaspartic acid derivatives, and in particular relates to a synthesis method for preparing sulfonic acid group-modified polyaspartic acid by microwave chemical technology using maleic anhydride as the main raw material . Background technique [0002] Polyaspartic acid is a new type of environmentally friendly scale inhibitor and dispersant for water treatment. It is used in circulating cooling water systems to prevent equipment such as heat exchangers and pipelines from scaling, which may cause safety hazards or economic losses to industrial production. The dirt in the cooling water system generally includes calcium and magnesium carbonates, sulfates, phosphates, silicate scales, metal oxides, slime and organic scales. In particular, the iron sludge formed by iron oxide produced by corrosion adheres to the surface of metal equipment, which not only breeds bacteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/12C08G73/10
Inventor 高利军丰九英赵文婷何妙燕
Owner ZHANJIANG NORMAL UNIV
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