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Composite scale inhibition and corrosion inhibitor and applications in low-hardness water

A scale and corrosion inhibitor, condensation reaction technology, used in scale removal and water softening, water/sludge/sewage treatment, special treatment targets, etc. The problem of high content is to achieve the effect of less components, good corrosion and scale inhibition effect, and improved corrosion inhibition effect.

Active Publication Date: 2020-04-28
CHINA PETROLEUM & CHEM CORP +1
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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 overcome the problems in the prior art that the amount of phosphorus-containing scale and corrosion inhibitors is large, the phosphorus content is high, and the low-hardness water cannot be targeted for scale and corrosion inhibition, and to provide a particularly suitable Composite scale and corrosion inhibitor for low hardness water and its application. The composite scale and corrosion inhibitor is suitable for scale and corrosion inhibition treatment of low hardness circulating cooling water. A small dosage can achieve better scale and corrosion inhibition effect

Method used

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  • Composite scale inhibition and corrosion inhibitor and applications in low-hardness water
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  • Composite scale inhibition and corrosion inhibitor and applications in low-hardness water

Examples

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Effect test

preparation example 1

[0065] Prepare the condensation reaction product of sodium gluconate and triethanolamine: add 32.7g (0.15mol) sodium gluconate, 14.9g (0.1mol) triethanolamine and 100mL water in the four-neck flask equipped with stirrer, distillation unit and thermometer, Start stirring, so that sodium gluconate and triethanolamine are fully dissolved and mixed. After that, add 5g (0.05mol) of concentrated sulfuric acid at 20°C, heat the oil bath (simethicone oil) to 130°C, react for 6 hours, distill 40g of water, and cool the remaining liquid to obtain the condensation of sodium gluconate and triethanolamine The reaction product has a solid content of 40% by weight and a molecular weight distribution of 327-683.

preparation example 2

[0067] Prepare the condensation reaction product of sodium gluconate and triethanolamine: add 32.7g (0.15mol) sodium gluconate, 134.1g (0.9mol) triethanolamine and 100mL water in the four-neck flask equipped with stirrer, distillation unit and thermometer, Start stirring, so that sodium gluconate and triethanolamine are fully dissolved and mixed. Afterwards, 45 g (containing H 2 SO 4 , 0.45mol) concentrated sulfuric acid, heated to 130°C in an oil bath (simethicone oil), reacted for 6 hours, distilled 50g of water, and cooled the remaining liquid to obtain the condensation reaction product of sodium gluconate and triethanolamine. After determination, its solid The content is 59.6% by weight, and its molecular weight is 327.

preparation example 3

[0069] Prepare the condensation reaction product of potassium gluconate and triethanolamine: add 23.4g (0.1mol) potassium gluconate, 2.3g (0.015mol) triethanolamine and 100mL water in the four-neck flask equipped with stirrer, distillation unit and thermometer, Start stirring, so that sodium gluconate and triethanolamine are fully dissolved and mixed. Afterwards, 3.15 g (containing HNO 3 ,0.034mol) concentrated nitric acid, heated to 110°C in an oil bath (simethicone oil), reacted for 2 hours, the amount of water evaporated was 25g, and the remaining liquid was cooled to obtain the condensation reaction product of potassium gluconate and triethanolamine. After determination, its solid The content is 22.8% by weight, and its molecular weight distribution is in the range of 327-683.

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Abstract

The invention relates to the field of circulating cooling water treatment, and discloses a composite scale inhibition and corrosion inhibitor, which is prepared from a condensation reaction product ofgluconate and triethanolamine, 2-phosphonobutane-1,2,4-tricarboxylic acid, a sulfonic acid group-containing copolymer and a zinc salt according to weight ratio of 1:(0.05-0.3):(0.2-1.5):(0.1-0.5), the weight of the zinc salt is calculated by zinc ions, and the gluconate is sodium gluconate and / or potassium gluconate. According to the composite scale inhibition and corrosion inhibitor provided bythe invention, all the components have a synergistic effect, so that the composite scale inhibition and corrosion inhibitor has good corrosion inhibition and scale inhibition effects, contains few components, is low in dosage, and is particularly suitable for treating low-hardness circulating cooling water, wherein the calcium hardness and the total alkalinity of replenished water are less than orequal to 100 mg / L.

Description

technical field [0001] The invention relates to the field of scale and corrosion inhibitors for circulating cooling water treatment, in particular to a low-phosphorus composite scale and corrosion inhibitors suitable for low-hard water and applications thereof. Background technique [0002] Cooling water accounts for a large proportion of industrial water consumption. A few decades ago, my country mostly used a once-through cooling water system, which caused a great waste of water resources. In recent years, the circulating cooling water system has been widely promoted in all walks of life because of its obvious water-saving effect, but what follows is the problem of corrosion and scaling of cooling facilities in the circulating cooling water system. [0003] Adding scale and corrosion inhibitors to the circulating water system is an effective way to control corrosion and scaling. Since the early 1970s, phosphorus-based water treatment agents have good corrosion and scale ...

Claims

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Application Information

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IPC IPC(8): C02F5/12
CPCC02F5/125C02F2303/08C02F2303/22
Inventor 任志峰魏新张化冰刘金香杨玉常磊冯婕
Owner CHINA PETROLEUM & CHEM CORP
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