Phosphorus-free corrosion inhibitor for low temperature and corrosion inhibition method for circulating cooling water

A circulating cooling water, phosphorus-free corrosion inhibition technology, applied in chemical instruments and methods, natural water treatment, descaling and water softening, etc., can solve problems such as strong corrosion, reduce treatment costs, save costs, and reduce growth and the effect of reproduction

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to basically no sewage treatment, Fe in water 3+ high, highly corrosive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0069] Prepare the condensation reaction product of sodium gluconate and aspartic acid: add 10.9g sodium gluconate, 16.6g aspartic acid and 100mL water in a four-necked flask equipped with a stirrer, a distillation device and a thermometer, and start stirring, so that Sodium gluconate and aspartic acid are fully dissolved and mixed. Add 7.5g (containing H 2 SO 4 ,0.075mol) concentrated sulfuric acid, heated to 140°C in an oil bath (dimethyl silicone oil), reacted for 6 hours, the amount of water evaporated was 45g, and the condensation reaction product of sodium gluconate and aspartic acid was obtained after the remaining liquid was cooled. , the solid content is 26.3% by weight, and its molecular weight distribution is in the range of 311-426.

preparation example 2

[0071] Preparation of the condensation reaction product of sodium gluconate and aspartic acid: Add 21.8g sodium gluconate, 26.6g aspartic acid and 100mL water in a four-necked flask equipped with a stirrer, a distillation device and a thermometer, and start stirring so that Sodium gluconate and aspartic acid are fully dissolved and mixed. Add 15g (0.15mol) of concentrated sulfuric acid at 20°C, heat the oil bath (simethicone oil) to 100°C, react for 10 hours, distill 30g of water, and get the mixture of sodium gluconate and aspartic acid after cooling the remaining liquid The condensation reaction product has a solid content of 29.5% by weight and a molecular weight distribution of 311-426.

Embodiment 1

[0073] Weighing 7.60g solid content is the condensation reaction product of sodium gluconate and aspartic acid (according to Preparation Example 1) of 26.3% by weight, 2.5g solid content is the polyepoxysuccinic acid of 40% by weight, 4.44g solid content TH-2000 with a content of 45% by weight (density (20°C) ≥ 1.15g cm -3 , dynamic viscosity (25°C) is 100-500cps), 2.2g of ZnSO 4 ·7H 2 O, add 83.26g of water and shake well to obtain 100g of the required preparation.

[0074] When the prepared agent is added to the test water at a concentration of 100mg / L, the condensation reaction product of sodium gluconate and aspartic acid in water, polyepoxysuccinic acid, TH-2000 and Zn 2+ The effective concentrations are 2mg / L, 1mg / L, 2mg / L and 0.5mg / L, respectively.

[0075] The evaluation was carried out according to the corrosion inhibition performance evaluation method of the above-mentioned corrosion inhibitor, wherein the test piece material used in the rotary coupon corrosion te...

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Abstract

The invention provides a non-phosphorus corrosion inhibitor and a corrosion inhibition method of circulating cooling water. The non-phosphorus corrosion inhibitor comprises a condensation reaction product of gluconate and aspartic acid, polyepoxysuccinic acid, a sulfonic group-containing copolymer, zinc salt and an optional heterocyclic compound, wherein the mass ratio of the condensation reaction product of gluconate and aspartic acid to polyepoxysuccinic acid is 1: (0.1-1.0). The phosphorus-free corrosion inhibitor disclosed by the invention does not contain phosphorus, meets the environmental protection requirement, and is suitable for corrosion and scale inhibition treatment of closed low-temperature circulating cooling water, especially closed low-temperature circulating cooling water which takes surface water as make-up water and has the temperature of 15-18 DEG C.

Description

technical field [0001] The invention relates to a low-temperature phosphorus-free corrosion inhibitor and a corrosion inhibition method for circulating cooling water. Background technique [0002] With the development of social economy, the consumption of industrial water is increasing day by day, and the consumption of cooling water accounts for the largest proportion. Therefore, the use of industrial circulating cooling water can save a large amount of industrial water, but it will cause serious problems during operation. Scaling, corrosion and other disadvantages. Adding water treatment agents to industrial circulating water to solve problems such as scaling and corrosion in pipelines is a method commonly used in industry at present. Phosphorus-based water treatment agents are used in industrial circulating cooling water because of their non-toxicity, low price, and good corrosion and scale inhibition properties. However, their use will cause eutrophication of the water ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/12C02F103/02
CPCC02F5/125C02F2103/023C02F2303/08
Inventor 魏新任志峰杨玉郦和生刘金香常磊
Owner CHINA PETROLEUM & CHEM CORP
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