Composite scale and corrosion inhibitor, and applications thereof in circulated cooling water treatment

Abstract

The invention discloses a composite scale and corrosion inhibitor. The composite scale and corrosion inhibitor contains carboxymethylinulin, a soluble inorganic salt corrosion inhibitor, and a carboxylic acid-containing polymer scale inhibitor dispersing agent at a weight ratio of (12-100):(2-25):(10-50). The invention also discloses applications of the composite scale and corrosion inhibitor in circulated cooling water treatment. The composite scale and corrosion inhibitor possesses excellent corrosion and scale inhibition comprehensive performance; and when the composite scale and corrosion inhibitor is applied to circulated cooling water treatment, requirements of circulated cooling water on scale and corrosion inhibition are satisfied, and environmental problems caused by phosphorus-containing chemicals in phosphorus-containing circulated cooling water are avoided.

Description

technical field

[0001] The invention relates to the fields of scale and corrosion inhibition and circulating water treatment, in particular to a composite scale and corrosion inhibitor and its application in circulating cooling water treatment. Background technique

[0002] In the circulating cooling water system, there are mainly scaling and corrosion problems. In order to prevent system scaling and corrosion, the most convenient and effective method is to add corrosion and scale inhibitors to the circulating cooling water. However, during the use of cooling water, with the continuous circulation and concentration, the mineral content in the water will continue to increase, which will intensify the corrosion and scaling of pipes and equipment. Therefore, it is necessary to add corrosion and scale inhibitors to improve the quality of cooling water and ensure The equipment operates safely. These chemicals will eventually be released into the environment as waste. However, ...

Examples

Embodiment 1

[0041] Weigh 30.0g carboxymethyl inulin (substitution degree is 1.0), 12.0g sodium tungstate and 30.0g acrylic acid / acrylamide / 2-methyl-2'-acrylamidopropanesulfonic acid copolymer (purchased from Luoyang Qianglong Industrial Co., Ltd.’s brand name is ZF322, the active substance content is 30% by weight, and the limiting viscosity number is 0.078dl / g at 30°C), add 28.0g of water, shake well, and obtain the composite scale and corrosion inhibitor stock solution S1 .

[0042] Take 1g of the prepared composite scale and corrosion inhibitor stock solution S1 and add it to 10L of test water 2 or 10L of test water 3, so that carboxymethyl inulin, sodium tungstate and acrylic acid / acrylamide / 2-methyl-2' - The effective concentrations of the acrylamido propane sulfonic acid copolymer were 6mg / L, 12mg / L and 9mg / L respectively, and then the calcium carbonate scale inhibition performance and corrosion inhibition performance were measured according to the method in the test example.

[00...

Embodiment 2

[0045] Take by weighing 3.14g zinc chloride, be dissolved in 23.3g acrylic acid / hydroxypropyl acrylate / methyl acrylate copolymer (purchased from Luoyang Qianglong Industrial Co., Ltd. The trade mark is the commodity of T-225, and active material content is 30% by weight, 30 ℃, the limiting viscosity number is 0.074dl / g), then add 15.0g of carboxymethyl inulin raw material (substitution degree is 0.6) and 18.0g of sodium molybdate, then add 20.56g of water, shake well to get composite scale inhibitor Etch agent stock solution S2.

[0046] Take 0.8g of the prepared composite scale and corrosion inhibitor stock solution S2 and add it to 10L of test water 2 or 10L of test water 3 to make carboxymethyl inulin, sodium molybdate, acrylic acid / hydroxypropyl acrylate / methyl acrylate copolymerized The effective concentrations of ions and zinc ions were 3mg / L, 18mg / L, 7mg / L and 1.5mg / L respectively, and then the calcium carbonate scale inhibition performance was measured according to the...

Embodiment 3

[0049] Weigh 1g of benzotriazole, dissolve it in 20g of acrylic acid / hydroxypropyl acrylate copolymer (purchased from Luoyang Qianglong Industrial Co., Ltd., the trade mark is T-225, the active substance content is 30% by weight, at 30°C The limiting viscosity is 0.079dl / g), then add 80.0g carboxymethyl inulin (substitution degree is 0.8) and 16.0g sodium silicate, then add 3g water, shake well, and get the stock solution of compound scale and corrosion inhibitor S3.

[0050] Take 1.2g of the prepared composite scale and corrosion inhibitor stock solution S3 and add it to 10L of test water 2 or 10L of test water 3, so that carboxymethyl inulin, sodium silicate, acrylic acid / hydroxypropyl acrylate copolymer and benzo The effective concentrations of triazole were 16mg / L, 16mg / L, 6mg / L and 1mg / L respectively, and then the calcium carbonate scale inhibition performance and corrosion inhibition performance were measured according to the method in the test example.

[0051] Use sul...

technical field

[0001] The invention relates to the fields of scale and corrosion inhibition and circulating water treatment, in particular to a composite scale and corrosion inhibitor and its application in circulating cooling water treatment. Background technique

[0002] In the circulating cooling water system, there are mainly scaling and corrosion problems. In order to prevent system scaling and corrosion, the most convenient and effective method is to add corrosion and scale inhibitors to the circulating cooling water. However, during the use of cooling water, with the continuous circulation and concentration, the mineral content in the water will continue to increase, which will intensify the corrosion and scaling of pipes and equipment. Therefore, it is necessary to add corrosion and scale inhibitors to improve the quality of cooling water and ensure The equipment operates safely. These chemicals will eventually be released into the environment as waste. However, ...

Examples

Embodiment 1

[0041] Weigh 30.0g carboxymethyl inulin (substitution degree is 1.0), 12.0g sodium tungstate and 30.0g acrylic acid / acrylamide / 2-methyl-2'-acrylamidopropanesulfonic acid copolymer (purchased from Luoyang Qianglong Industrial Co., Ltd.’s brand name is ZF322, the active substance content is 30% by weight, and the limiting viscosity number is 0.078dl / g at 30°C), add 28.0g of water, shake well, and obtain the composite scale and corrosion inhibitor stock solution S1 .

[0042] Take 1g of the prepared composite scale and corrosion inhibitor stock solution S1 and add it to 10L of test water 2 or 10L of test water 3, so that carboxymethyl inulin, sodium tungstate and acrylic acid / acrylamide / 2-methyl-2' - The effective concentrations of the acrylamido propane sulfonic acid copolymer were 6mg / L, 12mg / L and 9mg / L respectively, and then the calcium carbonate scale inhibition performance and corrosion inhibition performance were measured according to the method in the test example.

[00...

Embodiment 2

[0045] Take by weighing 3.14g zinc chloride, be dissolved in 23.3g acrylic acid / hydroxypropyl acrylate / methyl acrylate copolymer (purchased from Luoyang Qianglong Industrial Co., Ltd. The trade mark is the commodity of T-225, and active material content is 30% by weight, 30 ℃, the limiting viscosity number is 0.074dl / g), then add 15.0g of carboxymethyl inulin raw material (substitution degree is 0.6) and 18.0g of sodium molybdate, then add 20.56g of water, shake well to get composite scale inhibitor Etch agent stock solution S2.

[0046] Take 0.8g of the prepared composite scale and corrosion inhibitor stock solution S2 and add it to 10L of test water 2 or 10L of test water 3 to make carboxymethyl inulin, sodium molybdate, acrylic acid / hydroxypropyl acrylate / methyl acrylate copolymerized The effective concentrations of ions and zinc ions were 3mg / L, 18mg / L, 7mg / L and 1.5mg / L respectively, and then the calcium carbonate scale inhibition performance was measured according to the...

Embodiment 3

[0049] Weigh 1g of benzotriazole, dissolve it in 20g of acrylic acid / hydroxypropyl acrylate copolymer (purchased from Luoyang Qianglong Industrial Co., Ltd., the trade mark is T-225, the active substance content is 30% by weight, at 30°C The limiting viscosity is 0.079dl / g), then add 80.0g carboxymethyl inulin (substitution degree is 0.8) and 16.0g sodium silicate, then add 3g water, shake well, and get the stock solution of compound scale and corrosion inhibitor S3.

[0050] Take 1.2g of the prepared composite scale and corrosion inhibitor stock solution S3 and add it to 10L of test water 2 or 10L of test water 3, so that carboxymethyl inulin, sodium silicate, acrylic acid / hydroxypropyl acrylate copolymer and benzo The effective concentrations of triazole were 16mg / L, 16mg / L, 6mg / L and 1mg / L respectively, and then the calcium carbonate scale inhibition performance and corrosion inhibition performance were measured according to the method in the test example.

[0051] Use sul...

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