Compound scale and corrosion inhibitor and application thereof in circulating cooling water treatment

Abstract

The present invention discloses a compound scale and corrosion inhibitor comprising carboxymethylinulin, a plant natural polymer and derivatives thereof and poly aspartic acid and / or polyepoxysuccinic acid, and the weight ratio of carboxymethylinulin to plant natural polymer and derivatives thereof to poly aspartic acid and / or polyepoxysuccinic acid in the compound scale and corrosion inhibitor is (12-100 ) :( 2-25) :( 5-25). The present invention also discloses application of the compound scale and corrosion inhibitor in circulating cooling water treatment. The compound scale and corrosion inhibitor exhibits good overall performance of scale and corrosion inhibition, when the compound scale and corrosion inhibitor is used in circulating cooling water, scale and corrosion inhibition needs of the circulating cooling water can be met, and the environmental problem caused by a phosphorus-containing agent in phosphorus-containing circulating cooling water in the prior art can be 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

[0045] Weigh 30.0g carboxymethyl inulin (substitution degree is 1.0), 10.0g carboxymethyl lignin (purchased from Tianjin Huixinde Chemical Products Sales Co., Ltd.) and 18.0g polyepoxysuccinic acid (limit Viscosity number is 0.078dl / g), added into 42.0g of water, and shaken to obtain composite scale and corrosion inhibitor stock solution S1.

[0046] Take 1g of the prepared composite scale and corrosion inhibitor stock solution S1 and add it to 10L of test water 1, so that the effective concentrations of carboxymethyl inulin, carboxymethyl lignin and polyepoxysuccinic acid in the water are 6mg / L and 10mg respectively. / L and 9mg / L, and then measure the calcium carbonate scale inhibition performance and corrosion inhibition performance according to the method in the test example.

Embodiment 2

[0048] Weigh 3.14g of zinc chloride, dissolve it in 9.0g of polyaspartic acid (limited viscosity number is 0.074dl / g at 30°C), then add 15.0g of carboxymethyl inulin raw material (degree of substitution is 0.6) and 18.0 g carboxymethyl cellulose (purchased from Jinye Industrial Co., Ltd., Renqiu, Hebei), and then add 34.86 g of water, and shake well to obtain the compound scale and corrosion inhibitor stock solution S2.

[0049] 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, so that the concentration of carboxymethyl inulin, carboxymethyl cellulose, polyaspartic acid and zinc ions in the water The effective concentrations are 3mg / L, 18mg / L, 4.5mg / L and 1.5mg / L respectively, and then the calcium carbonate scale inhibition performance is measured according to the method in the test example.

[0050] Use sulfuric acid to adjust the pH value of the test water 2 to 7.8-8.3, then add the c...

Embodiment 3

[0052] Weigh 1g of benzotriazole, dissolve it in 12g of polyaspartic acid (at 30°C, the limiting viscosity is 0.079dl / g), then add 80.0g of carboxymethyl inulin (the degree of substitution is 0.8) and Add 6.0 g of sodium lignosulfonate (purchased from Jinan Liangfeng Trading Co., Ltd.), and then add 21 g of water, and shake well to obtain the composite scale and corrosion inhibitor stock solution S3.

[0053] Take 1.2g of the prepared composite scale and corrosion inhibitor stock solution S3 and add it to 10L of test water 1 to make the effective concentration of carboxymethyl inulin, sodium lignosulfonate, polyaspartic acid and benzotriazole in the water They are 16mg / L, 6mg / L, 6mg / L and 1mg / L respectively, and then the calcium carbonate scale inhibition performance and corrosion inhibition performance are measured according to the method in the test example.

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

[0045] Weigh 30.0g carboxymethyl inulin (substitution degree is 1.0), 10.0g carboxymethyl lignin (purchased from Tianjin Huixinde Chemical Products Sales Co., Ltd.) and 18.0g polyepoxysuccinic acid (limit Viscosity number is 0.078dl / g), added into 42.0g of water, and shaken to obtain composite scale and corrosion inhibitor stock solution S1.

[0046] Take 1g of the prepared composite scale and corrosion inhibitor stock solution S1 and add it to 10L of test water 1, so that the effective concentrations of carboxymethyl inulin, carboxymethyl lignin and polyepoxysuccinic acid in the water are 6mg / L and 10mg respectively. / L and 9mg / L, and then measure the calcium carbonate scale inhibition performance and corrosion inhibition performance according to the method in the test example.

Embodiment 2

[0048] Weigh 3.14g of zinc chloride, dissolve it in 9.0g of polyaspartic acid (limited viscosity number is 0.074dl / g at 30°C), then add 15.0g of carboxymethyl inulin raw material (degree of substitution is 0.6) and 18.0 g carboxymethyl cellulose (purchased from Jinye Industrial Co., Ltd., Renqiu, Hebei), and then add 34.86 g of water, and shake well to obtain the compound scale and corrosion inhibitor stock solution S2.

[0049] 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, so that the concentration of carboxymethyl inulin, carboxymethyl cellulose, polyaspartic acid and zinc ions in the water The effective concentrations are 3mg / L, 18mg / L, 4.5mg / L and 1.5mg / L respectively, and then the calcium carbonate scale inhibition performance is measured according to the method in the test example.

[0050] Use sulfuric acid to adjust the pH value of the test water 2 to 7.8-8.3, then add the c...

Embodiment 3

[0052] Weigh 1g of benzotriazole, dissolve it in 12g of polyaspartic acid (at 30°C, the limiting viscosity is 0.079dl / g), then add 80.0g of carboxymethyl inulin (the degree of substitution is 0.8) and Add 6.0 g of sodium lignosulfonate (purchased from Jinan Liangfeng Trading Co., Ltd.), and then add 21 g of water, and shake well to obtain the composite scale and corrosion inhibitor stock solution S3.

[0053] Take 1.2g of the prepared composite scale and corrosion inhibitor stock solution S3 and add it to 10L of test water 1 to make the effective concentration of carboxymethyl inulin, sodium lignosulfonate, polyaspartic acid and benzotriazole in the water They are 16mg / L, 6mg / L, 6mg / L and 1mg / L respectively, and then the calcium carbonate scale inhibition performance and corrosion inhibition performance are measured according to the method in the test example.

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