Methods for preparing and applying 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. Low scale efficiency and other problems, to achieve the effect of increasing scale inhibition performance, not destroying the ecological environment, good biodegradability and water solubility

Inactive Publication Date: 2010-08-04
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of high usage cost, low scale inhibition efficiency and harmfulness to the environment of existing scale inhibitors. A synthetic method of modified polyaspartic acid scale inhibitor with high efficiency and low production cost, and the second is to provide an application method of modified polyaspartic acid scale inhibitor, which increases its application range

Method used

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  • Methods for preparing and applying modified polyaspartic acid scale inhibitor
  • Methods for preparing and applying modified polyaspartic acid scale inhibitor
  • Methods for preparing and applying modified polyaspartic acid scale inhibitor

Examples

Experimental program
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preparation example Construction

[0020] (1) Preparation of polysuccinimide (PSI)

[0021] ① While stirring, add 29.4g of maleic anhydride and 60mL of deionized water into a 250mL four-neck flask, raise the temperature to 85°C and add dropwise 45mL of ammonia water with a mass fraction of 25%. A colorless solution was obtained after the ammonia water was added dropwise. Stir at 75-85°C for 2 hours to completely dissolve the suspension and obtain a clear homogeneous solution.

[0022] ②The homogeneous solution in step ① was distilled under reduced pressure at 90°C to obtain a mixture of white crystals and a small amount of viscous liquid. Add about 45mL of deionized water and heat again until the crystals dissolve. The liquid was cooled in an ice bath, crystals were precipitated, and white flaky crystals of maleimide were obtained by suction filtration.

[0023] ③ Dissolve the white flaky crystal maleimide prepared in step ② with 20-30ml of deionized water, put it in a methyl silicone oil bath for condensati...

Embodiment 1

[0029] Based on 1 liter of water, 12mg / L of CSN-PASP, 12mg / L of self-made PASP, 12mg / L of CSN and 6mg / L of homemade PASP and 6mg / L of CSN were prepared in the volumetric flask according to the mass concentration ratio. Then pour it into a Erlenmeyer flask, cover it tightly with a rubber stopper with a glass tube, heat it in a constant temperature water bath at 80°C for 10 hours, and measure the scale inhibition rate of the agent. The results are shown in Table 1.

[0030] Table 1

[0031]

Embodiment 2

[0033] Based on 1 liter of water, prepare 12mg / L CSN-PASP antiscalant solution according to the mass concentration ratio, place them in constant temperature water baths at 60°C, 70°C, 80°C and 90°C for 10 hours, then measure the carbonation resistance of the agent Calcium scale inhibition rate. When the temperature is less than 80℃, the antiscalant has good adaptability. The result is as figure 1 shown.

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Abstract

The invention relates to methods for preparing and applying a modified polyaspartic acid scale inhibitor, which belong to the field of preparation and application of scale inhibitors. The method for preparing the modified polyaspartic acid scale inhibitor comprises the following step of: preparing polysuccinimide (PSI), polyaspartic acid (PASP) and modified polyaspartic acid (CSN-PASP). The scale inhibitor prepared by using the method has good adaptability at the temperature of 50-80 DEG C and the pH value ranging from 6.0 to 8.5. The modified polyaspartic acid scale inhibitor belongs to a polymer type scale inhibitor. A PASP molecule does not contain phosphorus, has no poison, does not destroy the ecological environment and has favorable biodegradability and water solubility, and the excellent scale inhibiting dispersion performance is particularly suitable for industrial water treatment. The aim for improving the scale inhibiting performance of the PASP is achieved by just adding a micromolecule substance in synthesis without changing other process conditions.

Description

Technical field: [0001] The invention relates to the preparation technology of modified polyaspartic acid scale inhibitor. In particular, it relates to the preparation and application method of a modified polyaspartic acid scale inhibitor used in water treatment agents. technical background: [0002] In recent years, with the development of industry, the water consumption in the industrial production process is increasing day by day, and the research on scale inhibitors has been paid more attention. Among the many scale inhibitors, there are problems of high cost of scale inhibitors, low scale inhibition efficiency and harmful to the environment. At present, green scale inhibitors and water treatment replacement products recognized at home and abroad have become the research and development hotspots. Studies have shown that optimizing the synthesis conditions can add new functional groups to the main chain of PASP through polymerization modification, so that PASP has multi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F122/40C08F8/12C08F8/34C02F5/12
Inventor 柳鑫华孔毅超杜蛟王庆辉
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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