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Phosphorus-free composite corrosion inhibitor suitable for natural pH operation and application thereof

A compound corrosion inhibitor, a natural technology, applied in natural water treatment, special treatment targets, water/sludge/sewage treatment, etc., can solve the problems of scaling and corrosion of cooling facilities

Active Publication Date: 2020-04-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The supply and demand of circulating cooling water has a major impact on the water use, drainage and water saving of the entire industrial enterprise, but it brings about the problem of fouling and corrosion of cooling facilities in the circulating cooling water system

Method used

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  • Phosphorus-free composite corrosion inhibitor suitable for natural pH operation and application thereof
  • Phosphorus-free composite corrosion inhibitor suitable for natural pH operation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0051] Preparation of condensation reaction product of sodium gluconate and aspartic acid

[0052] Add 21.8g (0.1mol) of sodium gluconate (purchased from Bailingwei Technology Co., Ltd., analytical grade) and aspartic acid (purchased from Aladdin Reagent (Shanghai) into a four-necked flask equipped with a stirrer, distillation device and thermometer. Co., Ltd., analytically pure) 26.6g (0.2mol) and 100mL water, start stirring to fully dissolve and mix sodium gluconate and aspartic acid, and then add concentrated sulfuric acid (purchased from Tianjin Guangfu Fine Chemicals) at room temperature (20℃) Research Institute, analytically pure, with a concentration of 98% by weight) 15g (containing H 2 SO 4 0.15mol). The heating bath (heating medium is simethicone) containing the aforementioned flask was heated to 100°C, and reacted for 10 hours. During the reaction, the amount of distilled water was 30g, and the remaining liquid was sodium gluconate with a solid content of 29.5% by wei...

preparation example 2

[0054] Preparation of condensation reaction product of sodium gluconate and aspartic acid

[0055] Add 10.9 g (0.05 mol) of sodium gluconate (0.05 mol), 16.6 g (0.125 mol) of aspartic acid and 100 mL of water into a four-necked flask equipped with a stirrer, distillation device and thermometer. Start stirring to make sodium gluconate and aspartame The acid is fully dissolved and mixed, and then 7.5g of concentrated sulfuric acid (containing H 2 SO 4 , 0.075mol). The heating bath (heating medium is dimethyl silicone oil) with the aforementioned flask is heated to 140°C, reacted for 6 hours, the amount of water distilled out during the reaction is 45g, and the remaining liquid is sodium gluconate with a solid content of 26.3% by weight. The condensation reaction product of aspartic acid has been determined to have a molecular weight distribution in the range of 311-426.

preparation example 3

[0057] Preparation of the condensation reaction product of potassium gluconate and aspartic acid

[0058] Add 23.4g (0.1mol) of potassium gluconate (purchased from Bailingwei Technology Co., Ltd., analytical grade), 13.3g (0.1mol) of aspartic acid and 100mL of water into a four-necked flask equipped with a stirrer, distillation device and thermometer. , Start stirring to fully dissolve and mix potassium gluconate and aspartic acid, then add concentrated nitric acid (purchased from Beijing Yili Fine Chemical Research Institute, analytically pure, concentration 68% by weight) at room temperature (20°C) 3.7g (With HNO 3 , 0.04mol). The heating bath (the heating medium is simethicone) containing the aforementioned flask was heated to 180°C, and reacted for 6 hours. During the reaction, the amount of distilled water was 55g, and the remaining liquid was potassium gluconate with a solid content of 41.7% by weight. The condensation reaction product of aspartic acid has been determined ...

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Abstract

The invention relates to the field of circulating cooling water treatment and discloses a phosphorus-free composite corrosion inhibitor suitable for natural pH operation and application thereof. The phosphorus-free composite corrosion inhibitor contains a condensation reaction product, ascorbic acid, a sulfonate copolymer and zinc salt, wherein the weight ratio of the condensation reaction productto the ascorbic acid to the sulfonate copolymer to the zinc salt is 1: (0.06-0.28): (0.5-5): (0.06-1), and the condensation reaction product is a condensation reaction product of sodium gluconate andaspartic acid and / or a condensation reaction product of potassium gluconate and aspartic acid; and the weight of the zinc salt is based on zinc ions. According to the phosphorus-free composite corrosion inhibitor provided by the invention, the components have a synergistic effect, so that the phosphorus-free composite corrosion inhibitor has a good corrosion inhibition effect, contains few components, is relatively low in dosage, and is particularly suitable for treating medium-hard circulating cooling water of which the sum of the calcium hardness and the total alkalinity of supplement wateris 100-300 mg / L.

Description

Technical field [0001] The present invention relates to the field of circulating cooling water treatment, in particular to a phosphorus-free composite corrosion inhibitor and its application in circulating cooling water treatment. Background technique [0002] The supply and demand of circulating cooling water has a major impact on the water use, drainage and water saving of the entire industrial enterprise, but it also brings about the problem of scaling and corrosion of the cooling facilities in the circulating cooling water system. In the circulating cooling water system, adding corrosion inhibitors is one of the most important methods to prevent corrosion of circulating cooling water facilities. With the improvement of China’s environmental protection laws and regulations, in recent years there have been new requirements for the direct discharge of water pollutants, including GB 31570-2015 "Petroleum Refining Industry Pollutant Emission Standard" and GB 31571-2015 "Petrochemi...

Claims

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Application Information

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IPC IPC(8): C02F5/10C02F103/02
CPCC02F5/105C02F2103/023C02F2303/08
Inventor 张化冰任志峰魏新冯婕杨玉常磊
Owner CHINA PETROLEUM & CHEM CORP