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

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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 particular

Method used

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

Examples

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Example Embodiment

[0064] Preparation Example 1

[0065] Preparation of 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 a four-necked flask equipped with a stirrer, distillation device and thermometer. Turn on the stirring so that the sodium gluconate and triethanolamine are fully dissolved and mixed. After that, add 5g (0.05mol) concentrated sulfuric acid at 20°C, heat the oil bath (dimethicone) to 130°C, react for 6 hours, and distill 40g of water. Cool the remaining liquid to obtain the condensation of sodium gluconate and triethanolamine. The solid content of the reaction product is determined to be 40% by weight, and the molecular weight distribution is in the range of 327-683.

Example Embodiment

[0066] Preparation Example 2

[0067] Preparation of 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 a four-necked flask equipped with a stirrer, distillation device and thermometer. Turn on the stirring so that the sodium gluconate and triethanolamine are fully dissolved and mixed. After that, add 45g (containing H 2 SO 4 , 0.45mol) concentrated sulfuric acid, heated in an oil bath (dimethyl silicone oil) to 130°C, reacted for 6 hours, the amount of steamed water is 50g, and the remaining liquid is cooled 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.

Example Embodiment

[0068] Preparation Example 3

[0069] Preparation of 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 a four-necked flask equipped with a stirrer, distillation device and thermometer. Turn on the stirring so that the sodium gluconate and triethanolamine are fully dissolved and mixed. After that, add 3.15g (containing HNO 3 , 0.034mol) concentrated nitric acid, heated in an oil bath (dimethyl silicone oil) to 110°C, reacted for 2h, the amount of distilled water is 25g, and the remaining liquid is 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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