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A kind of preparation method of scale inhibitor

A scale inhibitor, polyaspartic acid technology, applied in chemical instruments and methods, scale removal and water softening, water/sludge/sewage treatment, etc., can solve the problem of low scale inhibition efficiency, environmental harm and low production cost and other problems, to achieve the effect of not destroying the ecological environment, broadening the scope of application, good biodegradability and water solubility

Active Publication Date: 2021-07-16
TANGSHAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of low scale inhibition efficiency and harmfulness to the environment of the existing scale inhibitors, and provide a kind of scale inhibitor with good solubility in water, non-toxic and harmless to the environment, biodegradable, high scale inhibition efficiency, and low production cost. Synthetic method of low polyaspartic acid derivative scale inhibitor

Method used

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  • A kind of preparation method of scale inhibitor
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  • A kind of preparation method of scale inhibitor

Examples

Experimental program
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Effect test

Embodiment 1

[0017] A. Preparation of polyaspartic acid (PASP)

[0018] ① Synthesis of PSI: Add 9.8g maleic anhydride and 20mL deionized water into a three-neck flask, stir and heat to 84°C, then slowly add ammonia water according to the mass ratio of maleic anhydride to ammonia water 1:1.25. After hydrolysis for 1.5h, distillation under reduced pressure gave white flaky crystals of maleimide. Add deionized water dropwise until the maleimide just dissolves, and then conduct a polycondensation reaction at 200°C for 40 minutes to obtain a brown-red sticky substance—polysuccinimide (PSI).

[0019] ② Synthesis of PASP: PSI was just dissolved in deionized water, and then hydrolyzed by adding 4 mL of 3 mol / L sodium hydroxide in a water bath at a temperature of 65 ° C for 45 min. The measured pH is about 9.5, neutralized with hydrochloric acid to make pH=7. Wash with absolute ethanol, filter and dry to obtain polyaspartic acid (PASP).

[0020] B. Preparation of polyaspartic acid derivative sca...

Embodiment 2

[0023] A. Preparation of polyaspartic acid (PASP)

[0024] ① Synthesis of PSI: Add 19.6g maleic anhydride and 40mL deionized water into a three-neck flask, stir and heat to 85°C, then slowly add ammonia water according to the mass ratio of maleic anhydride to ammonia water 1:1.25. Hydrolyzed for 2h and distilled under reduced pressure to obtain white flaky crystals of maleimide. Add deionized water dropwise until the maleimide just dissolves, and then conduct a polycondensation reaction at 210°C for 50 minutes to obtain a brown-red sticky substance—polysuccinimide (PSI).

[0025] ② Synthesis of PASP: PSI was just dissolved in deionized water, and then hydrolyzed by adding 8 mL of 3 mol / L sodium hydroxide in a water bath at a temperature of 70 °C for 50 min. The measured pH is about 10, neutralized with hydrochloric acid to make pH=7. Wash with absolute ethanol, filter and dry to obtain polyaspartic acid (PASP).

[0026] B. Preparation of polyaspartic acid derivative scale i...

Embodiment 3

[0029] A. Preparation of polyaspartic acid (PASP)

[0030] ① Synthesis of PSI: Add 29.4g maleic anhydride and 60mL deionized water into a three-necked flask, stir and heat to 86°C, then slowly add ammonia water according to the mass ratio of maleic anhydride to ammonia water 1:1.25. Hydrolyzed for 3h and distilled under reduced pressure to obtain white flaky crystals of maleimide. Add deionized water dropwise until the maleimide just dissolves, and then conduct a polycondensation reaction at 220°C for 60 minutes to obtain a brown-red sticky substance—polysuccinimide (PSI).

[0031] ② Synthesis of PASP: PSI was just dissolved in deionized water, and then hydrolyzed by adding 12 mL of 3 mol / L sodium hydroxide in a water bath at a temperature of 75 °C for 55 min. The measured pH is about 10.5, neutralized with hydrochloric acid to make pH=7. Wash with absolute ethanol, filter and dry to obtain polyaspartic acid (PASP).

[0032] B. Preparation of polyaspartic acid derivative sc...

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Abstract

The invention relates to the field of a preparation method of a scale inhibitor. In particular, it relates to a preparation method of a scale inhibitor which has good biodegradability and water solubility and is used in water treatment agents. The method comprises the steps of: preparing polyaspartic acid (PASP); the preparation of polyaspartic acid derivative antiscalant (abbreviated as TH-PASP); polyaspartic acid derivative antiscalant with 1 liter of water According to the calculation, when the scale inhibitor is added, the scale inhibition rate is significantly higher than the scale inhibition rate of maleic anhydride and thiourea alone, compounded and CSN-PASP copolymer. The invention improves the scale inhibition ability of the original polyaspartic acid, and finally achieves the purpose of improving the scale inhibition efficiency. No need to change other process conditions, just change the synthesis method and add a small molecular substance in the synthesis, so as to achieve the purpose of increasing the anti-scaling performance of polyaspartic acid.

Description

technical field [0001] The invention relates to the preparation technology of polyaspartic acid derivative scale inhibitor. In particular, it relates to a preparation method of a scale inhibitor polyaspartic acid derivative. Background technique [0002] In recent years, with the development of industry, the scale problem of calcium, magnesium and other metal ions in industrial water in equipment or pipelines has become increasingly significant, and more and more attention has been paid to the research on scale inhibitors. Among many scale inhibitors, there are problems such as high cost of use, low scale inhibition rate and harmful to the environment. At present, the replacement products of green scale inhibitors recognized at home and abroad have become a research and development hotspot. The research shows that the optimized synthesis method increases functional groups on the main chain of PASP through grafting modification, so that PASP has a higher scale inhibition rat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/12
CPCC02F5/12
Inventor 柳鑫华贾静娴王孟依韩婕舒世立吴卫华王磊
Owner TANGSHAN NORMAL UNIV
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