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Composite scale and corrosion inhibitor suitable for low-hardness water and application thereof

A scale and corrosion inhibitor, hard water technology, applied in natural water treatment, non-polluted water treatment, descaling and water softening, etc., can solve the problem of scaling and corrosion of cooling facilities

Active Publication Date: 2020-04-21
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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  • Composite scale and corrosion inhibitor suitable for low-hardness water and application thereof
  • Composite scale and corrosion inhibitor suitable for low-hardness water and application thereof
  • Composite scale and corrosion inhibitor suitable for low-hardness water and application thereof

Examples

Experimental program
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Effect test

preparation example 1

[0059] Preparation of Condensation Reaction Product of Sodium Gluconate and Aspartic Acid

[0060] Add sodium gluconate (purchased from Bailingwei Technology Co., Ltd., analytically pure) 21.8g (0.1mol), aspartic acid (purchased from Aladdin Reagent (Shanghai) 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°C) Institute, analytically pure, concentration is 98% by weight) 15g (containing H 2 SO 4 0.15mol). The heating bath (heating medium is simethicone) built-in the aforementioned flask was heated up to 100°C, and reacted for 10 hours. During the reaction, the amount of steamed water was 30g, and the remaining liquid, that is, a solid content of 29.5% by weight, was sodium gluconate and sodium gluconate. The condensation reaction product of aspartic acid has been determined...

preparation example 2

[0062] Preparation of Condensation Reaction Product of Sodium Gluconate and Aspartic Acid

[0063] Add 10.9g (0.05mol) of sodium gluconate, 16.6g (0.125mol) of aspartic acid, and 100mL of water into a four-neck flask equipped with a stirrer, a distillation device, and a thermometer, and start stirring to make sodium gluconate and asparagus The acid was fully dissolved and mixed, and then at room temperature (20°C), 7.5 g of concentrated sulfuric acid (containing H 2 SO 4 , 0.075mol). The heating bath (heating medium is simethicone) that is built-in with aforementioned flask is heated up to 140 ℃, reacts for 6 hours, and the amount of steamed water in the reaction process is 45g, and remaining liquid is the sodium gluconate and the sodium gluconate that solid content is 26.3% by weight and sky. 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

[0065] Preparation of Condensation Reaction Product of Potassium Gluconate and Aspartic Acid

[0066] Add potassium gluconate (purchased from Bailingwei Technology Co., Ltd., analytically pure) 23.4g (0.1mol), aspartic acid 13.3g (0.1mol) and 100mL water into a four-necked flask equipped with a stirrer, a distillation device and a thermometer , start stirring, potassium gluconate and aspartic acid are fully dissolved and mixed, then add concentrated nitric acid (purchased from Beijing Yili Fine Chemical Research Institute, analytically pure, concentration is 68% by weight) 3.7g at room temperature (20°C) (with HNO 3 , 0.04mol). The heating bath (heating medium is simethicone) that is built-in with aforementioned flask is heated up to 180 ℃, reacts for 6 hours, and steaming water amount is 55g in the reaction process, and remaining liquid is that solid content is 41.7% by weight of potassium gluconate and sky. The condensation reaction product of aspartic acid has been determ...

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Abstract

The invention relates to the field of circulating cooling water treatment, and discloses a composite scale and corrosion inhibitor suitable for low-hardness water and application of the composite scale and corrosion inhibitor. The composite scale and corrosion inhibitor contains a condensation reaction product, 2-phosphonobutane-1,2,4,-tricarboxylic acid, a sulfonate copolymer and a zinc salt; wherein the weight ratio of the condensation reaction product, the 2-phosphonobutane-1,2,4,-tricarboxylic acid, the sulfonate copolymer and the zinc salt is 1: (0.07-0.22): (0.2-1.6): (0.07-1); the condensation reaction product is a condensation reaction product of sodium gluconate and aspartic acid and / or a condensation reaction product of potassium gluconate and aspartic acid; and the weight of thezinc salt is based on zinc ions. According to the composite scale and corrosion inhibitor provided by the invention, components have a synergistic effect, so that the composite scale and corrosion inhibitor has good scale and corrosion inhibition effects, and is few in component and relatively low in dosage.

Description

technical field [0001] The invention relates to the field of circulating cooling water treatment, in particular to a composite scale and corrosion inhibitor suitable for low-hard water 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 brings the problem of fouling and corrosion of cooling facilities in the circulating cooling water system. In the circulating cooling water system, adding scale and corrosion inhibitors is one of the most important methods to prevent scaling and corrosion of circulating cooling water facilities. With the improvement of my country's environmental protection laws and regulations, there are new requirements for the direct discharge of water pollutants in recent years, including GB 31570-2015 "Petroleum Refining Industry Pollutant Discharge Standard" and...

Claims

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Application Information

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IPC IPC(8): C02F5/14C02F103/02
CPCC02F5/145C02F2103/023C02F2303/08C02F2303/22C23F11/08C23F14/02
Inventor 张化冰任志峰魏新刘金香杨玉冯婕
Owner CHINA PETROLEUM & CHEM CORP
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