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Scale inhibitor for low temperature multiple-effect distillation sea water desalting plants and preparation method thereof

A multi-effect distillation and scale inhibitor technology, applied in chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc. Poor taste and other problems, to achieve the effect of ensuring safe and stable operation, good drinking taste and prolonging service life

Active Publication Date: 2010-11-03
CHINA SHENHUA ENERGY CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, Sokalan PM15I antiscalant has an unpleasant smell at room temperature. When the agent is added to water, these volatile organic compounds will all be brought into the product water with the steam during the distillation process, resulting in poor drinking taste of the product water and affecting the sale of the product water.

Method used

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  • Scale inhibitor for low temperature multiple-effect distillation sea water desalting plants and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] This embodiment provides a method for preparing a scale inhibitor for a low-temperature multi-effect distillation seawater desalination device, and the preparation method includes the following steps:

[0023] A, add the benzotriazole 0.05% of quality level in reactor;

[0024] B, then add 0.05% ethanol of mass grade in reactor, preferably, described ethanol is food-grade alcohol, stir 5~50 minutes while adding and mixing;

[0025] C. Add 35% of mass-grade acrylic acid binary copolymer to the stirred solution, and stir for 5 to 50 minutes;

[0026] D. Add 40% of mass-grade polyacrylic acid and 4.5% of mass-grade hydrolyzed polymaleic acid to the stirred solution, and stir for 10 to 50 minutes;

[0027] E. Add 0.35% of mass-grade phenol polyoxyethylene ether to the stirred solution, and stir for 5 to 50 minutes;

[0028] F. Finally, add the water of the remaining components and stir for 5-50 minutes.

[0029] Thus, the scale inhibitor of the low-temperature multi-effe...

Embodiment 2

[0040] The difference between this embodiment and the above-mentioned embodiment is that the scale inhibitor includes the following components of mass grade: polyacrylic acid 57%, acrylic acid binary copolymer 20%, benzotriazole 0.35%, hydrolyzed polymaleic acid 1%, ethanol 2%, phenol polyoxyethylene ether 0.05%, and the rest is water.

[0041]The corrosion test results of the present embodiment are: when No. 1 seawater desalination uses the scale inhibitor of the present invention to run, the annual corrosion rate of aluminum brass is 0.0189mm / a; when No. 2 seawater desalination uses SokalanPM15 I type scale inhibitor to run , the annual corrosion rate of aluminum brass is 0.0196mm / a. In the corrosion inhibition performance to aluminum brass, the corrosion inhibition performance of the scale inhibitor of the present invention is obviously better than that of Sokalan PM15 type I scale inhibitor.

Embodiment 3

[0043] The difference between this embodiment and the above-mentioned embodiments is that the scale inhibitor of this embodiment includes the following components of mass grade: polyacrylic acid 45%, acrylic acid binary copolymer 28%, benzotriazole 0.15%, hydrolyzed 2.5% polymaleic acid, 1% ethanol, 0.2% phenol polyoxyethylene ether, and the rest is water.

[0044] The corrosion test results of the present embodiment are: when No. 1 seawater desalination uses the scale inhibitor of the present invention to run, the annual corrosion rate of aluminum brass is 0.0186mm / a; when No. 2 seawater desalination uses SokalanPM15 I type scale inhibitor to run , the annual corrosion rate of aluminum brass is 0.0196mm / a. In the corrosion inhibition performance to aluminum brass, the corrosion inhibition performance of the scale inhibitor of the present invention is obviously better than that of Sokalan PM15 type I scale inhibitor.

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Abstract

The invention relates to a scale inhibitor for low temperature multiple-effect distillation sea water desalting plants and a preparation method thereof. The scale inhibitor comprises the following components in percentage by mass: 40-57% of polyacrylic acid, 20-35% of acrylic acid bipolymer, 0.05-0.35% of benzotriazole, 1-4.5% of hydrolytic polymaliec acid, 0.05-2% of ethanol, 0.05-0.35% of phenol polyethenoxy ether and balance of water. The manufacturing cost of the scale inhibitor of the invention is less than above10% of the manufacturing cost of the existing scale inhibitor. In addition, many raw materials of the scale inhibitor are at food level; and thus, the scale inhibitor can not easily volatilize, and no toxic or harmful organic substances are brought into the product water through distillation in the production process. The product water has good mouthfeel, the indices are far better than the drinking water standard, and the water can be easily accepted by mass people. The invention has better corrosion inhibition performance, can prolong the service life of metal, and can effectively ensure safe and stable operation of similar sea water desalting plants.

Description

technical field [0001] The invention relates to a scale inhibitor and a preparation method thereof, in particular to a scale inhibitor for a low-temperature multi-effect distillation seawater desalination device and a preparation method thereof. Background technique [0002] The low-temperature multi-effect distillation seawater desalination process refers to the seawater desalination technology with the highest evaporation temperature (TBT) of brine not exceeding 70°C and several effect groups (evaporators). The evaporator is equipped with horizontal heat transfer tubes (the upper layer is a titanium tube, The lower layer is aluminum brass). Input a certain amount of steam and through multiple evaporation and condensation, so as to obtain distilled water that is multiple times the amount of heating steam. The steam source comes from the steam extraction of the medium-pressure cylinder of the steam turbine of the generator set. The internal pressure of the effect is reduced...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/12
Inventor 吴志奇孟林辉聂鑫庞毅李子拥李大伟
Owner CHINA SHENHUA ENERGY CO LTD
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