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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, easy to agglomerate, make the reaction can not be carried out completely, reduce reaction efficiency, finally polyaspartic acid Technical Problems of Decreased Acid Yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 60ml of water to a three-necked flask equipped with a stirring bar and a thermometer, then add 50g of maleic anhydride (manufacturer name Changzhou Shuguang Chemical Factory, brand name Shuguang), then heat to 60°C in a water bath, and maleic anhydride Stir for 30 minutes after dissolving, keep the system temperature at about 60°C, stop stirring, and slowly add 50g of ammonium bicarbonate (Huzhou Huijing Chemical Factory, purity 98.5%). Then gradually raise the temperature and start stirring, and react at a temperature of about 75° C. for 1 hour to obtain white ammonium maleate solid crystals. Move the ammonium maleate crystal to a 304 stainless steel tray of 500cm × 300cm and spread it to a thickness of 3cm, then place the 304 stainless steel tray filled with ammonium maleate crystal in a half-closed container, and the semi-closed container is connected with a heat air channel. Circulate hot air at 175°C and continue heating for 3.5 hours to cause high-temperature...

Embodiment 2

[0025] Add 70ml of water to a three-necked flask equipped with a stirring bar and a thermometer, then add 50g of maleic anhydride (manufacturer name Changzhou Shuguang Chemical Factory, brand name Shuguang), then heat to 55°C in a water bath, and maleic anhydride Stir for 30 minutes after dissolving, keep the system temperature at about 70°C, stop stirring, and slowly add 60g of ammonium bicarbonate (Huzhou Huijing Chemical Factory, purity 98.5%). Then gradually raise the temperature and start to stir, react at a temperature of about 65° C. for 1.5 hours to obtain white ammonium maleate solid crystals. Move the ammonium maleate crystal to a 304 stainless steel tray of 500cm × 300cm and spread it to a thickness of 3cm, then place the 304 stainless steel tray filled with ammonium maleate crystal in a half-closed container, and the semi-closed container is connected with a heat air channel. Circulating hot air at 185°C was circulated, and the heating was continued for 3 hours to...

experiment example

[0027] Scale inhibition rate test program:

[0028] The scale inhibition performance of polyaspartic acid should use the static calcium carbonate method (GB / T 16632-2008 "Determination of scale inhibition performance of water treatment agents by calcium carbonate deposition method"). The condition is that the calcium ion concentration is 0.240 mg / mL; the bicarbonate ion concentration is 0.732 mg / mL. A 500ml glass bottle with a condensing reflux tube, kept at 80°C 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 scale inhibition rate calculation formula is:

[0029]

[0030] x 1 ...calcium ions (Ca 2+ ) concentration, the unit is mg / mL;

[0031] x 0 ...calcium ions (Ca 2+ ) concentration, the unit is mg / mL;

[0032] 0.240... Calcium ions (Ca 2+ ) concentration in mg / mL.

[0033] According to the above-mentioned experimental method, the polyaspartic...

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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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