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Composite corrosion and scale inhibitor for high-chlorine-ion circulating water

A technology of corrosion and scale inhibitors and ion circulation, applied in the field of scale inhibitors, can solve problems such as ineffective inhibition of corrosion, and achieve good synergy, corrosion inhibition, and good stability of chemical compatibility

Inactive Publication Date: 2016-12-21
LANZHOU BLUESTAR CLEANING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of the above patents can effectively inhibit the corrosion of the softened water system with high concentration of chloride ions.

Method used

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  • Composite corrosion and scale inhibitor for high-chlorine-ion circulating water
  • Composite corrosion and scale inhibitor for high-chlorine-ion circulating water
  • Composite corrosion and scale inhibitor for high-chlorine-ion circulating water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Add 54.5g of deionized water into the reaction kettle, start stirring, and add 6g of aminotrimethylene phosphonic acid, 18g of 2-phosphonic acid butane-1,2,4-tricarboxylic acid, and acrylic acid copolymer in the following order 5g, 1g of hydrochloric acid, 9g of zinc chloride, 6g of sodium tripolyphosphate, and 0.5g of benzotriazole. After adding each raw material, stir and mix well or until the next raw material is completely dissolved before adding the next raw material. Stir after all the raw materials are added at 0.5h.

Embodiment 2

[0048] Add 57.5 g of deionized water into the reaction kettle, start stirring, and add 9 g of diethylene triamine pentamethylene phosphonic acid, 2-phosphonic acid butane-1,2 , 14g of 4-tricarboxylic acid, 4g of hydrolyzed polymaleic anhydride, 1g of sulfuric acid, 9.5g of zinc sulfate monohydrate, 4g of sodium hexametaphosphate, and 1g of methylbenzotriazole. After each raw material is added, fully stir and mix evenly or until the next raw material is completely dissolved, then add the next raw material, and stir for 1 hour after all the raw materials are added.

Embodiment 3

[0050] Add 58.5 g of deionized water into the reaction kettle, start stirring, and add 2.5 g of hydroxyethylene diphosphonic acid, 2-phosphonic acid butane-1,2,4-tri Carboxylic acid 20g, acrylic acid copolymer 3g, sulfuric acid 1.5g, zinc sulfate heptahydrate 10g, sodium hexametaphosphate 4g, methyl benzotriazole 0.5g. After each raw material is added, fully stir and mix evenly or until the next raw material is completely dissolved, and then add the next raw material, and stir for 1.5 hours after all the raw materials are added.

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Abstract

The invention relates to a composite corrosion and scale inhibitor for high-chlorine-ion circulating water. The composite corrosion and scale inhibitor is a high-efficiency high-stability low-cost chlorine-ion-corrosion-resistant composed of organic phosphonic acid, phosphocarboxylic acid, polycarboxylic acid, polyphosphate, zinc salt, inorganic acid, azole and the like. The composite corrosion and scale inhibitor has favorable scale and corrosion inhibition effects on high-chlorine-ion-content medium / high-hardness water, and also has favorable corrosion inhibition effects on high-chlorine-ion-content softened water. Under favorable synergistic actions of the components, the composite corrosion and scale inhibitor provided by the invention has the advantages of high reagent compounding stability and obvious corrosion and scale inhibition effects, and can ensure the long-term safe stable operation of the circulating water system under high-chlorine-ion-content water conditions within a wider calcium ion content range.

Description

technical field [0001] The invention relates to the technical field of scale inhibitors, in particular to a composite corrosion and scale inhibitor for circulating water with high chloride ions. Background technique [0002] The content of chloride ions in natural water varies greatly, ranging from a few mg / L in fresh water to tens of thousands mg / L in seawater. The impact of its content on the corrosion process of metals has always been a concern of many industries. In the industrial cooling water system, a large number of equipment are heat exchangers made of metal, so it is required that the chloride ions in the industrial cooling water be as few as possible. However, due to different climate, terrain, soil and other factors, the water quality varies greatly in various regions of my country. The water hardness and salt content in the southeast to northwest regions show an increasing trend. As far as the Yellow River Basin and the area to the north, due to the decrease in...

Claims

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Application Information

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IPC IPC(8): C02F5/08C02F5/10C02F5/14C02F101/12
CPCC02F5/105C02F5/145C02F2101/12
Inventor 路瑞玲常青梁晓春王晓霞
Owner LANZHOU BLUESTAR CLEANING CO LTD
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