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Efficient low-phosphorus corrosion and scale inhibitor

A technology of corrosion and scale inhibitor, copper corrosion inhibitor, applied in descaling and water softening, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve problems such as application limitations and reduce environmental hazards , Excellent anti-CaCO3 scaling function, small dosage effect

Inactive Publication Date: 2009-10-21
兰州华星高科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pollution of phosphorus-containing compounds to water bodies and the resulting eutrophication have made people gradually realize the importance of controlling the discharge of phosphorus-containing compounds. Environmental protection departments in many countries have issued corresponding regulations to limit the discharge of phosphorus-containing compounds. my country's GB8979 -1996 "Integrated Sewage Discharge Standard" Level 1 discharge requires all pollutant discharge enterprises to have phosphorus (calculated as P) ≤ 0.5mg / L, so the application of commonly used organic phosphine is restricted

Method used

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  • Efficient low-phosphorus corrosion and scale inhibitor
  • Efficient low-phosphorus corrosion and scale inhibitor
  • Efficient low-phosphorus corrosion and scale inhibitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: A kind of efficient low-phosphorus corrosion and scale inhibitor, including hydroxyethylidene diphosphonic acid (HEDP) 5.76%; 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) 2.5% %; Acrylic acid-2-acrylamide-2-methylpropanesulfonic acid multi-polymer (AA / AMPS) 3%; Maleic acid-acrylic acid copolymer (MA / AA) 21.6%; Benzotriazole (BTA) 1.2%; balance water.

[0012] Preparation method: Prepared in a 1-ton reactor

[0013] 1. Dissolve 12kgBTA in commercially available earlier, and solid content is 450kg in the maleic acid-acrylic acid copolymer of 48%;

[0014] 2 Add 96 kg of HEDP (commercially available, with a solid content of 60%), 50 kg of PBTCA (commercially available, with a solid content of 50%), and 100 kg of AA / AMPS (commercially available, with a solid content of 30%) in the reactor, and start stirring;

[0015] 3 With stirring, slowly add the maleic acid-acrylic acid mixture dissolved in BTA into the reaction kettle;

[0016] 4 Add 292kg of wat...

Embodiment 2

[0022] Embodiment 2: A kind of efficient low-phosphorus corrosion and scale inhibitor, including hydroxyethylidene diphosphonic acid (HEDP) 4.8%; 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) 5 %; Acrylic acid-2-acrylamide-2-methylpropanesulfonic acid multi-polymer (AA / AMPS) 6%; Maleic acid-acrylic acid copolymer (MA / AA) 14.4%; Benzotriazole (BTA) 2%; the balance is water.

[0023] Preparation method: Prepared in a 1-ton reactor

[0024] 1. Dissolve 20kgBTA in the commercially available, solid content is 300kg in the maleic acid-acrylic acid copolymer of 48%;

[0025] 2 Add 80 kg of HEDP (commercially available, with a solid content of 60%), 100 kg of PBTCA (commercially available, with a solid content of 50%), and 200 kg of AA / AMPS (commercially available, with a solid content of 30%) in the reactor, and start stirring;

[0026] 3 With stirring, slowly add the maleic acid-acrylic acid mixture dissolved in BTA into the reaction kettle;

[0027] 4 Add 300kg of water and...

Embodiment 3

[0032] Embodiment 3: A kind of efficient low-phosphorus corrosion and scale inhibitor, including 4.32% of hydroxyethylidene diphosphonic acid (HEDP); 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) 4.5% %; Acrylic acid-2-acrylamide-2-methylpropanesulfonic acid multi-polymer (AA / AMPS) 5.4%; Maleic acid-acrylic acid copolymer (MA / AA) 12.96%; Polyacrylic acid (PAA) 6.5%; Benzotriazole (BTA) 1%; the balance is water.

[0033] Preparation method: Prepared in a 1-ton reactor

[0034] 1. Dissolve 10kg of BTA in the commercially available, 300kg of maleic acid-acrylic acid copolymer with a solid content of 48%;

[0035] 2 Add HEDP (commercially available, solid content is 60%) 72kg successively in the reaction kettle, PBTCA (commercially available, solid content is 50%) 90kg, AA / AMPS (commercially available, solid content is 30%) 180kg, PAA (commercially available, solid content is 30%) 180kg, PAA (commercially available, solid content is 30%) sale, solid content 50%) to start st...

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Abstract

The invention relates to a low-phosphorus compound corrosion and scale inhibitor and applications in the treatment of high-alkalinity and high-hardness circulating cooling water thereof. The efficient low-phosphorus corrosion and scale inhibitor is characterized by adding the following components according to the circulating water: 0.2-1.2mg / L of hydroxyethylidene diphosphonic acid, 0.125-1mg / L of 2-phosphonic acid-1,2,4-tricarboxylic acid, 0.14-1.2mg / L of sulphonate copolymer, 0.625-5mg / L of maleic acid-acrylic acid copolymer, 0-1.6mg / L of polyacrylic acid and 0-0.4mg / L of copper relief agent. The low-phosphorus compound corrosion and scale inhibitor can be used for the treatment of circulating cooling water, has the total phosphorus content less than or equal to 0.5mg / L in the circulating water, has the advantages of good comprehensive performance, excellent CaCO3 scale resistance function, corrosion inhibition performance and small dosage of less than or equal to 20mg / L under normal condition, is applicable to the treatment of circulating cooling water, and reduces the hazards of phosphorus emission on environment.

Description

technical field [0001] The invention relates to a low-phosphorus composite scale and corrosion inhibitor and its application in the treatment of high alkalinity and high hardness circulating cooling water. Background technique [0002] At present, in the circulating cooling water system, there are mainly three problems of scaling, corrosion and microbial hazards. The most convenient and effective way to prevent system scaling and corrosion is to add corrosion and scale inhibitors to the circulating cooling water. At present, most of the formulas commonly used in domestic circulation cooling treatment are phosphine-based formulas, and the main agent is containing phosphonic acid group (-PO 3 h 2 ) Corrosion and scale inhibitors directly connected to carbon atoms, often called organic phosphonic acids. Since organic phosphonic acid was developed and applied to circulating cooling water treatment in the late 1960s, water treatment technology and process have made great progr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/14
Inventor 王心齐王琦王福霖李桂英
Owner 兰州华星高科技开发有限公司
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