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A low-phosphorus high-efficiency corrosion and scale inhibitor and its application in scale inhibition of industrial circulating cooling water

A technology of corrosion and scale inhibitors and circulating cooling water, which can be used in descaling and water softening, chemical instruments and methods, water/sludge/sewage treatment, etc., and can solve problems such as toxicity, large usage, and destruction of ecological balance

Active Publication Date: 2017-11-07
湖北省兴发磷化工研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amount of use is large, resulting in a phosphorus content of about 15ppm and poor oxidation resistance.
At present, in the above treatment methods, the phosphorus content in the discharged wastewater cannot meet the national discharge standards, which is prone to eutrophication and destroys the ecological balance.
However, the use of inorganic corrosion inhibitors such as chromate and nitrite has great toxicity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] The low-phosphorus high-efficiency corrosion and scale inhibitor selects raw materials by weight percentage:

[0019] 5% 2-phosphonobutane-1,2,4-tricarboxylic acid, 3% phosphoryl carboxylic acid copolymer, 15% acrylic acid-2-acrylamide-2-methylpropanesulfonic acid, 15% polyaspartic acid, 5% zinc acetate, and the rest is water.

[0020] Experimental water quality (supplementary water quality): Calcium hardness is 120mg / L, total alkalinity is 110 mg / L, and chloride ion content is 60mg / L.

[0021] The above-mentioned corrosion and scale inhibitor of the present invention and the above-mentioned experimental water (supplementary water quality) are used to carry out the calcium carbonate scale inhibition experiment. The total addition amount of the medicament is 14 mg / L according to the amount of water replenishment. The calcium carbonate scale inhibition test method: take the experimental water ( Add water quality), add a certain concentration of medicament, evaporate and ...

example 2

[0029] Corrosion and scale inhibitors select raw materials by weight percentage:

[0030] 5% 2-phosphonobutane-1,2,4-tricarboxylic acid, 8% polyaspartic acid, 5% zinc acetate, 7% polyepoxysuccinic acid, 15% acrylic acid-2 - acrylamide-2-methylpropanesulfonic acid - hydroxypropyl acrylate, the rest is water.

[0031] The water quality of the experiment adopts the supplementary water and distribution water in Example 1 respectively.

[0032] Adopt above-mentioned corrosion and scale inhibitor of the present invention and above-mentioned supplementary water of 3 times of concentration and water distribution to carry out the mensuration of calcium carbonate scale inhibition test, calcium phosphate scale inhibition test, rotary hanging plate test and phosphorus content according to the method of example 1 respectively, The total amount of corrosion and scale inhibitor added is 8 mg / L based on the amount of water replenished, and the results are as follows:

[0033] Calcium carbon...

example 3

[0035] Corrosion and scale inhibitors select raw materials by weight percentage:

[0036] 3% phosphoryl carboxylic acid copolymer, 5% zinc acetate, 20% acrylic acid-2-acrylamide-2-methylpropanesulfonic acid, 18% polyepoxysuccinic acid, 5% 2-phosphonic acid butane-1,2,4-tricarboxylic acid and the rest is water.

[0037] The water quality of the experiment adopts the supplementary water and distribution water in Example 1 respectively.

[0038] Adopt the above-mentioned corrosion and scale inhibitor of the present invention and the above-mentioned concentrated 5 times supplementary water and water distribution to carry out the calcium carbonate scale inhibition experiment, the calcium phosphate scale inhibition experiment, the rotary hanging plate experiment and the mensuration of phosphorus content according to the method for example one, slow down The total addition amount of corrosion and scale inhibitor based on the amount of water added is 16 mg / L. The results are as follo...

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Abstract

The invention discloses a low-phosphorus high-efficiency corrosion and scale inhibitor and an application thereof in scale inhibition of industrial circulating cooling water. The corrosion and scale inhibitor contains the following effective components in parts by weight: 1-3 parts of an organic phosphonic acid corrosion and scale inhibitor, 3-6 parts of low-phosphorus or phosphorus-free scale inhibitor, 3-8 parts of a sulfonic acid type polymer scale inhibitor, and 1-3 parts of a zinc salt. The corrosion and scale inhibitor has excellent CaCO3 scale resistance, Ca3(PO4)2 scale resistance and corrosion inhibition rate when the industrial circulating water having water quality conditions of Ca<2+> of 120 mg / L, Cl<-> of 60 mg / L and the alkalinity of 110 mg / L is concentrated to 3-6 times, the drug total content is 8-20 ppm, and the phosphorus content is less than 0.5 ppm.

Description

technical field [0001] The invention relates to a corrosion and scale inhibitor for industrial circulating cooling water, in particular to an industrial circulating cooling water system anti-CaCO agent suitable for concentration times of 3 to 6 times 3 Scale rate, Ca inhibition 3 (PO 4 ) 2 The scale rate and corrosion inhibition rate are both greater than 90%, the total chemical content is 8-20ppm, and the phosphorus content is less than 0.5ppm. Background technique [0002] Industrial production requires a large amount of water as a cooling medium to cool products and heat exchange equipment. The supply and demand of cooling water has a major impact on the entire enterprise's industrial water use, drainage, water conservation and even society. Therefore, in order to reduce the water intake of the cooling water system, it is generally adopted to change the once-through cooling water to circulating cooling water and operate at a high concentration multiple to reduce the am...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/14
CPCC23F11/08C23F14/02
Inventor 袁木平刘黎亚李永刚杨桂春马会娟杨超龙刘舜刘超宇
Owner 湖北省兴发磷化工研究院有限公司
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