Process for preparation of biodegradable corrosion-scale inhibitor poly-aspartic acid

A polyaspartic acid, corrosion and scale inhibitor technology, applied in chemical instruments and methods, scale removal and water softening, water/sludge/sewage treatment, etc. Report on the preparation method of aspartic acid, blocking membrane, shortening membrane life and other problems, to achieve the effect of shortened process and process time, good scale inhibition effect and obvious stability

Inactive Publication Date: 2004-12-29
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In seawater reverse osmosis desalination, CaSO 4 , BaSO 4 , SrSO 4 It is the main component of scale. These scales will block the membrane, resulting in reduced membrane flux, reduced production ca...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add 196g of maleic anhydride to a three-necked flask equipped with a stirring and thermometer, then add 98ml of water, then heat in a water bath to 55°C to 80°C, stir for 30 minutes after the maleic anhydride dissolves, then cool to about 5°C, Stirring was stopped, and 272 g of 25% ammonia solution was slowly added. Dry this liquid in a spray dryer at a temperature of 160°C to obtain white ammonium maleate, then place the ammonium maleate in a pressure vessel to stir and heat it to about 220°C with an oil bath, and maintain the pressure at 0.4MPa. After 5 hours, polysuccinimide was obtained. Under the condition of 50℃~80℃, polysuccinimide is hydrolyzed into sodium polyaspartic acid with 20% aqueous sodium hydroxide solution, and a reddish-brown viscous liquid with a solid content of not less than 35% is obtained, namely A solution of polyaspartic acid was obtained.

Embodiment 2

[0017] Add 196g of maleic anhydride to a three-necked flask equipped with a stirring and thermometer, then add 98ml of water, then heat in a water bath to 55°C to 80°C, stir for 30 minutes after the maleic anhydride dissolves, then cool to about 5°C, Stirring was stopped, and 163 g of 25% aqueous ammonia solution was slowly added to generate amine maleate. Dry the maleic ammonium liquid in a spray dryer at 160°C to obtain white maleic ammonium, then place the maleic ammonium in a pressure vessel and heat it to about 240°C with an oil bath, and maintain the pressure at 0.5 MPa, and reacted for 4 hours to obtain polysuccinimide. Cool to 50°C-80°C, add 20% sodium hydroxide aqueous solution to hydrolyze to polyaspartic acid sodium salt, and obtain a reddish-brown viscous liquid with a solid content of not less than 35%, namely polyaspartic acid solution.

Embodiment 3

[0019] Add 294g of maleic anhydride to a three-necked flask equipped with a stirring and thermometer, then add 140ml of water, then heat in a water bath to 55°C-80°C, stir for 30 minutes after the maleic anhydride dissolves, then cool to about 5°C, Stop stirring, slowly add 25% ammonia solution 306g, generate maleic acid amine. Dry the ammonium maleate liquid in a spray dryer at 160°C to obtain white ammonium maleate, then place the ammonium maleate in a pressure vessel and heat it to about 230°C with an oil bath, maintaining the pressure at 0.5MPa , Reacted for 3 hours to obtain polysuccinimide. Cool to 50°C-80°C, add 20% sodium hydroxide aqueous solution to hydrolyze to polyaspartic acid sodium salt, and obtain a reddish-brown viscous liquid with a solid content of not less than 35%, namely polyaspartic acid solution.

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Abstract

The present invention belongs to the field of chemical technology, and is especially the preparation process of polyaspartic acid as one kind of biodegradable corrosion and scale inhibitor. Maleic anhydride is first converted into maleic amine and the maleic amine is spray dried with one spray drier to obtain dry maleic amine; maleic amine is then condensated into succinimide; and succinimide is finally hydrolyzed in the presence of alkali into polyaspartic acid. The present invention is one kind of homopolymer containing amido and carboxyl radical, has excellent scale inhibiting and distributing capacity and excellent corrosion inhibiting performance, and may be used widely in circular cooling water system, boiler, oil field, sea water desalting, etc.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and specifically relates to a preparation method of polyaspartic acid, a biodegradable corrosion and scale inhibitor. The corrosion and scale inhibitor is a phosphorus-free low molecular weight homopolymer, belonging to the Green and environment-friendly, biodegradable corrosion and scale inhibitor, used for scale and corrosion inhibition treatment of water quality. Background technique [0002] In all areas involved in water treatment, fouling and corrosion can have serious consequences for production, reducing productivity and even causing downtime. For example, in the industrial circulating cooling water system, CaCO 3 It is the most common scale that often leads to scaling on the inner surface of equipment pipes, affecting water flow and heat transfer efficiency. In severe cases, it can also cause pipe blockage and cause shutdown. Corrosion will cause serious damage to equipment an...

Claims

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Application Information

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IPC IPC(8): C02F5/10C08G69/08
Inventor 张冰如李风亭
Owner TONGJI UNIV
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