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Prepn of polyasparagic acid as environment protecting scale inhibitor

A technology of polyaspartic acid and antiscalant, which is applied in chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc. It can solve the problems of complex process and high equipment requirements, and achieve strong Effect of heat resistance, high tolerance, apparent stability

Inactive Publication Date: 2003-02-26
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These preparation methods, the technological process is more complicated, and equipment requirement is higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 296g of maleic anhydride to a three-necked flask equipped with a stirring and thermometer, then add 70ml of water, then heat in a water bath to 55°C to 70°C, stir for 30 minutes after the maleic anhydride dissolves, then cool to about 5°C, Stirring was stopped, and 200 g of 25% ammonia solution was slowly added. Then gradually raise the temperature and start stirring, and continue to react at a temperature of 85°C to 90°C for 4 hours to obtain a transparent glass-like viscous liquid. Dry the liquid in a spray dryer at 160°C to obtain white polysuccinamide, then stir the polysuccinamide in a container and heat it to about 220°C with an oil bath for 2-3 hours to obtain yellow polysuccinimide. Polysuccinimide is hydrolyzed into polyaspartic acid sodium salt by adding 20% ​​aqueous sodium hydroxide solution at 70°C to 80°C to obtain a reddish-brown viscous liquid with a solid content of not less than 35%. That is, polyaspartic acid solution.

Embodiment 2

[0022] Add 296g of maleic anhydride to a three-necked flask equipped with a stirring and thermometer, then add 70ml of water, then heat in a water bath to 60°C to 80°C, stir for 30 minutes after the maleic anhydride dissolves, then cool to about 5°C, Stirring was stopped, and 200 g of 25% ammonia solution was slowly added. Then gradually raise the temperature and start stirring, and continue to react at a temperature of 85°C to 90°C for 4 hours to obtain a transparent glass-like viscous liquid. Dry the liquid in a spray dryer at 160°C to obtain white polysuccinamide, then place the polysuccinamide in a closed container and heat it to about 290°C with an oil bath for 1 hour, then cool it to 50°C-70°C , adding 20% ​​sodium hydroxide aqueous solution to hydrolyze the sodium salt of polyaspartic acid to obtain a reddish-brown viscous liquid with a solid content of not less than 35%, that is, polyaspartic acid solution.

Embodiment 3

[0024] Add 98g of maleic anhydride to a three-necked flask equipped with a stirring and thermometer, then add 30ml of water, then heat in a water bath to 60°C-70°C, stir for 30 minutes after the maleic anhydride dissolves, then cool to about 5°C, Stirring was stopped, and 220 g of 25% ammonia solution was slowly added. Then gradually raise the temperature and start stirring, and continue to react at a temperature of 85°C to 90°C for 4 hours to obtain a transparent glass-like viscous liquid. Dry the liquid in a spray dryer at 110°C to obtain white polysuccinamide, then stir the polysuccinamide in a vacuum dehumidification container and heat it to about 220°C in an oil bath for 2 to 3 hours to obtain yellow polysuccinamide imine. Polysuccinimide is hydrolyzed into polyaspartic acid sodium salt by adding 20% ​​sodium hydroxide aqueous solution under the condition of 50°C to 80°C to obtain a reddish-brown viscous liquid with a solid content of not less than 35%. That is, polyasp...

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Abstract

The present invention is polyasparagic acid as degradable environment-protection scale inhibitor and its synthesis process. The scale inhibitor is a kind of homopolymer with amido group and carboxyl group. Owing to the amino group and carboxyl group, the polyasparagic acid has excellent dispersivity to various kinds of scales. In addition, owing to the peptide linkage structure of amino acid in the structure, the scale inhibitor may be degraded into inorganic salt under the action of microbes. The polyasparagic acid is prepared through converting maleic anhydride into amine salt, polymerization and shrinkage into polysuccinylimide and hydrolysis under the presence dof alkali.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and specifically relates to a preparation method of a scale inhibitor polyaspartic acid. The scale inhibitor is a phosphorus-free low-molecular-weight homopolymer, belongs to an environment-friendly green scale inhibitor, and is used for water quality antiscaling treatment. Background technique [0002] In various fields involving water treatment, such as industrial circulating cooling water, boiler feed water, papermaking, petroleum industry, seawater desalination, etc., fouling can bring serious consequences to production, reduce production capacity, and even cause shutdown. For example, in industrial circulating cooling water systems, CaCO 3 The most common scale often leads to scaling on the inner surface of equipment pipes, affecting water flow and heat transfer efficiency, and in severe cases, it can also lead to pipe blockage and shutdown. In the paper industry, CaCO 3 , BaSO ...

Claims

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Application Information

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IPC IPC(8): C02F5/10C08G69/00
Inventor 李凤亭张冰如刘遂庆朱志良
Owner TONGJI UNIV
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