Phosphorus-free corrosion and scale inhibitor used for industrial circulation cooling water

A technology of circulating cooling water and phosphorus-free corrosion inhibition, applied in the field of phosphorus-free corrosion and scale inhibitor, can solve the problem of no phosphorus-free corrosion and scale inhibitor formula, complex formula, etc., to avoid the problem of water eutrophication, reduce Environmental pollution, good compatibility

Active Publication Date: 2013-06-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patents 200710052475, 200810039161, 200610127172, and 2009100205068 disclose the formulation of non-phosphorus corrosion and scale inhibitors, which contain molybdate and polyepoxysuccinic acid that play a role in corrosion inhibition, but the above corrosion and scale inhibitors The agent also contains other components such as polymaleic anhydride, acrylic acid copolymer, triethanolamine, benzotriazole (BTA) or tungstate, borate, etc., and the formula is complex
However, for the petrochemical wastewater to be used as circulating cooling water after secondary biochemical treatment, there is no efficient phosphorus-free corrosion and scale inhibitor formula.

Method used

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  • Phosphorus-free corrosion and scale inhibitor used for industrial circulation cooling water
  • Phosphorus-free corrosion and scale inhibitor used for industrial circulation cooling water
  • Phosphorus-free corrosion and scale inhibitor used for industrial circulation cooling water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Prepare 100g of phosphorus-free corrosion and scale inhibitor solution: weigh 20g of sodium molybdate and 20g of sodium silicate, add water and stir to dissolve after mixing, then add 20ML of PESA with a concentration of 500g / L, and finally add water to make the weight of the solution 100g , to obtain the desired corrosion and scale inhibitor solution.

[0027] Use 100g of the prepared phosphorus-free corrosion and scale inhibitor solution, and add it to the industrial water to be treated at a concentration of 100mg / L. The effective concentrations of each single component, namely sodium molybdate, sodium silicate, and PESA, are respectively 20mg / L, 20mg / L, 10mg / L.

[0028] Raw water quality of the above-mentioned industrial water: total hardness 270mg / L, ammonia nitrogen 0mg / L, calcium hardness 43.1mg / L, total alkalinity 468.9mg / L, Cl - 191.1mg / L, SO 4 211.2mg / L, pH 7.3, COD 27, turbidity 0.4, petroleum 8.5mg / L, conductivity 2360μS / cm, Fe 2+ 0.3mg / L.

Embodiment 2

[0030] Prepare 100g of phosphorus-free corrosion and scale inhibitor solution: weigh 18g of sodium molybdate, 10g of sodium silicate, and 12g of sodium gluconate, add water and stir to dissolve after mixing, then add 24ML of PESA with a concentration of 500g / L, and finally add water to make The weight of the solution is 100g, and the desired corrosion and scale inhibitor solution is obtained.

[0031] Add 100g of the prepared phosphorus-free corrosion and scale inhibitor solution to the industrial water to be treated at a concentration of 100mg / L. Concentrations are 18mg / L, 10mg / L, 12mg / L, 12mg / L respectively.

[0032] Raw water quality of industrial water: total hardness 27mg / L, ammonia nitrogen 0mg / L, calcium hardness 8.1mg / L, total alkalinity 1613mg / L, chloride ion 81mg / L, sulfate radical 3.1mg / L, pH 8.5, COD 35, turbidity Degree 1.2, petroleum 10.7mg / L, conductivity 3120μS / cm, Fe 2+ 0.1mg / L.

Embodiment 3

[0034] Prepare 100g of phosphorus-free corrosion and scale inhibitor solution: weigh 5g of sodium molybdate, 25g of sodium silicate, and 10g of sodium laurate, add water and stir to dissolve after mixing, then add 20ML of PESA with a concentration of 500g / L, and finally add water to make The weight of the solution is 100g, and the desired corrosion and scale inhibitor solution is obtained.

[0035] Add 100g of the prepared phosphorus-free corrosion inhibitor solution to the industrial water to be treated at a concentration of 100mg / L. The effective concentrations of each single component, namely sodium molybdate, sodium silicate, sodium laurate, and PESA, are respectively 5mg / L, 25mg / L, 10mg / L, 10mg / L.

[0036] The raw water quality of industrial water is the same as in Example 1.

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Abstract

The invention relates to a phosphorus-free corrosion and scale inhibitor used for industrial circulation cooling water, which comprises the components of molybdate, silicate, polyepoxysuccinic acid and the like and does not contain phosphate. The phosphorus-free corrosion and scale inhibitor provided by the invention has the synergistic effects of corrosion and scale inhibition, reduces the use amount of molybdate, is nontoxic and cheap, is friendly to the environment, is especially applicable to petrochemical industry waste water used as circulation cooling water through secondary biochemical treatment and has broad application prospect.

Description

technical field [0001] The invention relates to a water treatment agent, in particular to a phosphorus-free corrosion and scale inhibitor for industrial circulating cooling water. Background technique [0002] The annual economic loss caused by metal corrosion in my country accounts for about 4% of the gross national product. The use of appropriate corrosion and scale inhibitors can reduce the adverse effects caused by corrosion, scaling, and growth of bacteria and algae on metal materials in equipment and pipelines. Extend the service life of equipment and minimize the loss of energy and resources caused by corrosion. [0003] The use of early chromium corrosion inhibitors was limited due to their high toxicity. At present, the commonly used industrial circulating cooling water operation schemes include all-organic schemes under pH control, zinc addition schemes, and polyphosphate schemes. All-organic water treatment agents are generally composed of four parts: organic pho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/10
Inventor 王哲民沈树宝黄秋明陈英文黄勇罗翔章继龙王桂林韩晓磊郭玉旗
Owner CHINA PETROLEUM & CHEM CORP
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