Composite scale inhibitor

A composite scale inhibitor and polymer technology, which is applied in the fields of scale removal and water softening, water/sludge/sewage treatment, chemical instruments and methods, etc. The effect of carrying out, the preparation method is simple, and prolonging the service cycle

Inactive Publication Date: 2010-05-05
SHENZHEN NANFENG WATER TREATMENT SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the medium-to-high hardness of all scale inhibitors generally does not exceed 700mg/L (calculated as calcium carbonate), and the alkalinity is generally lower than 3...

Method used

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  • Composite scale inhibitor
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Prepare 100kg of cooling water composite scale inhibitor, preparation process: add HEDP 2.381kg, polymaleic acid dry 2.381kg, polyaspartic acid 11.905kg, polyacrylic acid terpolymer 11.905kg, polyacrylic acid tetrapolymer 11.905 kg, the rest is water, with a solid content of 39.62%.

[0029] For scale inhibition of industrial circulating cooling water systems, the indicators of cooling water are as follows:

[0030] Concentration ratio ≥ 6, total alkali 987mg / L, total hardness 978mg / L calculated as calcium carbonate, pH=7.78.

[0031] The amount of cooling water with a solid content of 70mg / L is added, and the scale inhibition performance is tested with reference to "Cooling Water Analysis and Experimental Methods" compiled by the Production Department and Development Department of China Petrochemical Corporation (published by the Information Center of Anqing Petrochemical Factory in 1993 ) in the "calcium carbonate deposition method" for static scale inhibition experi...

Embodiment 2

[0033] Prepare 100kg of cooling water composite scale inhibitor, preparation process: add HEDP 0.293kg, dry polymaleic acid 5.865kg, polyaspartic acid 17.595kg, polyacrylic acid tetrapolymer 17.595kg, the rest is water, solid content 41.35 %.

[0034] For scale inhibition of industrial circulating cooling water systems, the indicators of cooling water are as follows:

[0035] Concentration ratio ≥ 6, total alkali 987mg / L, total hardness 978mg / L calculated as calcium carbonate, pH=7.78.

[0036] The amount of cooling water with a solid content of 70mg / L is added, and the scale inhibition performance is tested with reference to "Cooling Water Analysis and Experimental Methods" compiled by the Production Department and Development Department of China Petrochemical Corporation (published by the Information Center of Anqing Petrochemical Factory in 1993 ) in the "calcium carbonate deposition method" to carry out the static scale inhibition experiment, the experimental results are ...

Embodiment 3

[0038] Prepare 100kg of cooling water composite scale inhibitor, preparation process: add HEDP 2.614kg, polymaleic acid dry 2.614kg, polyaspartic acid 6.536kg, polyacrylic acid terpolymer 16.340kg, polyacrylic acid tetrapolymer 6.536 kg, the rest is water, with a solid content of 34.64%.

[0039] For scale inhibition of industrial circulating cooling water systems, the indicators of cooling water are as follows:

[0040] Concentration ratio ≥ 6, total alkali 987mg / L, total hardness 978mg / L calculated as calcium carbonate, pH=7.82.

[0041] Add in the amount of cooling water with a solid content of 60mg / L, and the test of scale inhibition performance refers to "Cooling Water Analysis and Experimental Methods" compiled by the Production Department and Development Department of China Petroleum and Chemical Corporation (published by Anqing Petrochemical General Plant Information Center in 1993 ) in the "calcium carbonate deposition method" to carry out static scale inhibition exp...

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Abstract

The invention discloses a composite scale inhibitor which is applicable to high-hardness high-alkali industrial circulating water, and the scale inhibitor consists of HEDP, polyaspartic acid, polymaleic anhydride, polyacrylic acid dispersant and the like. Wherein, the polyacrylic acid dispersant can be one or more of polyacrylic acid ternary dispersants or quaternary dispersants. The composite scale inhibitor has excellent scale inhibition performance and very low formation rate of calcium carbonate scale during the using process, the discharged waste water under the use of the formula can not cause the nutrition-rich pollution to the environment, thereby belonging to environment-friendly products and being particularly applicable to processing the circulating water with high calcium hardness and high alkaline hardness. The cost of using the formula for processing the industrial circulating water is very low, and the cost of a medicament added for processing each ton of water is less than 0.7 yuan, thereby having very high economic value.

Description

technical field [0001] The invention relates to a composite scale inhibitor, in particular to a composite scale inhibitor suitable for high-hardness and high-alkali industrial circulating water. Background technique [0002] Industrial water accounts for a very large proportion of human water use, among which cooling water accounts for about 60-70% of industrial water use. Saving cooling water plays a pivotal role in protecting water resources. The main way to save cooling water is to recycle cooling water and increase the concentration ratio, but after increasing the concentration ratio, the concentration of calcium ions and chloride ions in the circulating water will increase, which will cause scaling and corrosion problems. [0003] In the 1970s, the method of treating high-alkalinity water was mainly to add acid to reduce the alkalinity of water, and at the same time add sodium hexametaphosphate and other agents for treatment. The treatment effect of this method is not ...

Claims

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Application Information

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IPC IPC(8): C02F5/14
Inventor 周志雄黄南哲
Owner SHENZHEN NANFENG WATER TREATMENT SERVICE
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