Preparation and application method of a modified polyaspartic acid scale inhibitor

A polyaspartic acid and scale inhibitor technology, applied in chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc., can solve problems such as poor scale inhibition performance of calcium phosphate, and achieve high efficiency The effect of scaling inhibition efficiency, improving scale inhibition performance and low production cost

Inactive Publication Date: 2017-05-31
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent CN 101792504B has invented a preparation and application method of a modified polyaspartic acid scale inhibitor. Maleimide is prepared by reacting maleic anhydride with ammonia water, and polysuccinimide is formed after polycondensation reaction. After adding N-N-dimethylformamide and thiourea, and then hydrolyzing it into a modified polyaspartic acid scale inhibitor in the presence of alkali, the modified polyaspartic acid has good scale inhibition performance on calcium carbonate, but for Other scales, especially the more common calcium phosphate, have poor scale inhibition performance. Therefore, in recent years, polyaspartic acid has been further modified to enhance its scale inhibition performance on various scales.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 29.4g of maleic anhydride and 70ml of deionized water into the beaker, dissolve in a water bath at 45°C, and then transfer to a 250ml three-necked flask. Add 18g of urea and 30ml of deionized water to the beaker, let it dissolve slowly at room temperature, after the urea is completely dissolved, slowly drop the urea into a three-necked bottle with maleic anhydride with a dropper, and perform amine at 105°C After 1h of chemical hydrolysis, take it out and cool to room temperature, add 5.88g sodium hydrogen sulfate catalyst, 3ml mixed acid solution of 14mol / L phosphoric acid and 18mol / L sulfuric acid in a volume ratio of 1:1. Then, it was reacted at 195°C for 3h to obtain a reddish-brown solid, namely polysuccinimide.

[0025] After taking out the polysuccinimide prepared in the above steps and cooling, add 20ml of N-N-dimethylformamide, add 2g of thiourea, stir for 30min, add 8g of chitosan, and carry out the copolymerization reaction at 105℃ for 2.5h, A red solution i...

Embodiment 2

[0050] Add 29.4g maleic anhydride into the beaker, add water to dissolve it, and then transfer it to a 250ml three-necked bottle. Add 12g of urea and water into the beaker, and let it dissolve slowly at room temperature. After the urea is completely dissolved, use a dropper to slowly drop the urea into a three-necked flask with maleic anhydride, and perform aminating hydrolysis at 100°C for 1.5 After h, take it out and cool to room temperature, add 4.5g of sodium bisulfate catalyst, 3ml of a mixed acid solution of 14mol / L phosphoric acid and 18mol / L sulfuric acid in a volume ratio of 1:1. Then, it was reacted at 165°C for 4h to obtain a reddish brown solid, namely polysuccinimide.

[0051] After taking out the polysuccinimide prepared in the above steps and cooling, add NN-dimethylformamide, add 2g thiourea, stir for 30min, add 6g chitosan, copolymerize at 105℃ for 3.5h, the reaction is obtained The red solution is then cooled and poured into a beaker. Add 5 times the volume of ...

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Abstract

The invention relates to a preparation method of a modified polyaspartic acid scale inhibitor. The preparation method is characterized by comprising the following steps: 1) preparing an aqueous liquid of maleic anhydride, adding water to dissolve urea and then dropwise adding the mixture into the aqueous liquid of the maleic anhydride, carrying out amination hydrolysis reaction at 100-105 DEG C, cooling to the room temperature, adding a sodium hydrogen sulfate catalyst, and reacting in an acid solvent at 150-195 DEG C to obtain polysuccinimide; 2) taking out and cooling the polysuccinimide, reacting the cooled polysuccinimide with chitosan in an oil bath pot at 100-110 DEG C for 2.5-3.5 hours by taking N-N-dimethyl formamide as a solvent and thiourea as a catalyst, cooling the mixture, adding absolute ethyl alcohol into the mixture, and washing and drying the mixture to obtain a final product modified polyaspartic acid. The modified modified polyaspartic acid scale inhibitor provided by the invention has good scale inhibition on calcium carbonate and calcium phosphate.

Description

Technical field [0001] The invention relates to a preparation and application method of a modified polyaspartic acid scale inhibitor, and belongs to the technical field of polymer materials and water treatment. Background technique [0002] In recent years, due to the scarcity of water resources and the deteriorating water resources environment, the research of industrial circulating water treatment agents has been forced to develop in terms of high efficiency, non-toxicity and biodegradability. The research and development of new and efficient scale inhibitors has been realized in theory and practice. A fundamental breakthrough is imperative. Polyaspartic acid is a new type of biodegradable environmentally friendly polymer material. Its raw materials are easily available and the price is not high. In recent years, it has been widely used in water treatment agents, detergents, cosmetics, bacteriostatic agents, and dispersions. Chemicals, chelating agents, pesticides, agricultura...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10C02F5/12
Inventor 曾德芳陈腾殊
Owner WUHAN UNIV OF TECH
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