Polyaspartic acid complex for scale inhibitor

A technology for polyaspartic acid and composites, applied in the field of polyaspartic acid composites, can solve the problems of reduced reaction efficiency, easy agglomeration, and inability to complete the reaction, so as to improve the reaction efficiency and avoid adhesion. Effect

Inactive Publication Date: 2011-08-10
ZHEJIANG XINHE ENVIRONMENT SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the polyaspartic acid polymerization process existing in the prior art, because the polymer system is very viscous,

Method used

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  • Polyaspartic acid complex for scale inhibitor
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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example 1

[0023] To the three-necked flask equipped with a stirring bar and a thermometer, add 60 ml of water, then add 50 g of maleic anhydride (the name of the manufacturer is Changzhou Shuguang Chemical Factory, and the brand name is Shuguang), then heat to 60° C. in a water bath, and maleic anhydride is added. After dissolving, stir for 30 minutes, maintain the temperature of the system at about 60° C., stop stirring, and slowly add 50 g of ammonium bicarbonate (brand Huzhou Huijing Chemical Factory, purity 98.5%). Then, the temperature was gradually raised, stirring was started, and the reaction was carried out at a temperature of about 75° C. for 1 hour to obtain a white solid crystal of ammonium maleate. The ammonium maleate crystals were moved to a 500cm×300cm 304 stainless steel tray and thinned to a thickness of 3cm, and then the 304 stainless steel trays containing the ammonium maleate crystals were placed in a semi-closed container, which was heated extern...

Example Embodiment

[0024] Example 2

[0025] Add 70 ml of water to the three-necked flask equipped with a stirring bar and a thermometer, then add 50 g of maleic anhydride (the name of the manufacturer is Changzhou Shuguang Chemical Factory, and the brand name is Shuguang), then heat to 55°C in a water bath, and maleic anhydride is added. After dissolving, stir for 30 minutes, maintain the temperature of the system at about 70° C., stop stirring, and slowly add 60 g of ammonium bicarbonate (brand Huzhou Huijing Chemical Factory, purity 98.5%). Then, the temperature was gradually raised and stirring was started, and the reaction was carried out at a temperature of about 65° C. for 1.5 hours to obtain a white solid crystal of ammonium maleate. The ammonium maleate crystals were moved to a 500cm×300cm 304 stainless steel tray and thinned to a thickness of 3cm, and then the 304 stainless steel trays containing the ammonium maleate crystals were placed in a semi-closed container, which was heated ext...

Example Embodiment

[0026] Experimental example

[0027] Scale inhibition rate test plan:

[0028] The scale inhibition performance of polyaspartic acid should use the static calcium carbonate method (GB / T 16632-2008 "Calcium carbonate deposition method for the determination of scale inhibition performance of water treatment agents"). The conditions are that the calcium ion concentration is 0.240 mg / mL; the bicarbonate ion concentration is 0.732 mg / mL. 500ml glass bottle with condensation reflux tube, constant temperature at 80 ℃ for 10 hours. Titrate with EDTA solution, measure the calcium ion concentration in the solution after constant temperature, and calculate the scale inhibition rate. The calculation formula of the scale inhibition rate is:

[0029]

[0030] X 1 …Calcium ions (Ca after addition of polyaspartic acid) 2+ ) concentration, in mg / mL;

[0031] X 0 …Calcium ions (Ca) after the test without polyaspartic acid added 2+ ) concentration, in mg / mL;

[0032] 0.240…Calcium ion...

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Abstract

The invention provides a polyaspartic acid complex for a scale inhibitor, which is characterized by being prepared by the following steps of: 1) reacting maleic anhydride, an ammonia-containing substance and water in a mass ratio of 1:((1-1.5):(1.2-2.0) under normal pressure at the temperature of between 50 and 80DEG C for 1 to 2 hours to synthesize maleic acid ammonia; 2) performing polymerization reaction on the maleic acid ammonia at the temperature of between 160 and 200DEG C under normal pressure to generate polysuccinimide; and 3) hydrolyzing the polysuccinimide at the pH of 10-12 and the temperature of between 25 and 50DEG C to generate the polyaspartic acid salt. The polyaspartic acid complex for the scale inhibitor has better scale inhibiting effect on various scaling components such as CaCO3, CaSO4, BaSO4 and SrSO4 in a water treatment system; and through scale inhibition rate testing experiments, the scale inhibition rate is not less than 40 percent, and the polyaspartic acid complex can be widely applied to various water treatment processes, such as a circulating cooling water system, a boiler feed water system, an oil-water water injection system and a seawater desalting system.

Description

technical field [0001] The invention relates to a polyaspartic acid composition, in particular to a polyaspartic acid composition used as a scale inhibitor, and belongs to the technical field of fine chemicals. Background technique [0002] In recent years, with the rapid development of industrial water treatment technology, the application of scale and corrosion inhibitor technology in water treatment has become increasingly widespread. The biggest problem in the water treatment process is that the scale salts produced in the water treatment concentration process, such as CaCO3, CaSO4, BaSO4 and SrSO4, etc., are deposited on the surface of industrial water instruments to reduce the use efficiency of the instruments and affect the normal operation of industrial equipment. run. In order to suppress and alleviate scaling, water treatment scale inhibitors are usually used in projects. Commonly used water treatment scale inhibitors include polyphosphate, organic phosphonic acid...

Claims

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Application Information

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IPC IPC(8): C08G73/10C02F5/12
Inventor 郑晨
Owner ZHEJIANG XINHE ENVIRONMENT SCI & TECH
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