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Water treating method with scale and corrosion inhibitor containing epoxy amber acid polymer

A technology of polyepoxysuccinic acid, corrosion and scale inhibition, applied in the field of water treatment, can solve the problems of not taking advantage of the green advantages of PESA, such as non-phosphorus, non-nitrogen and easy biodegradation

Inactive Publication Date: 2005-04-27
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

[0006] These published patents all use PESA as the scale inhibitor and acrylic and phosphorus compounds as the compounding agent. Although the corrosion and scale inhibition performance is good, they do not give full play to the green advantages of PESA, which are phosphorus-free, non-nitrogen and easy to biodegrade. There is no report of using PESA alone as a corrosion inhibitor

Method used

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  • Water treating method with scale and corrosion inhibitor containing epoxy amber acid polymer
  • Water treating method with scale and corrosion inhibitor containing epoxy amber acid polymer

Examples

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Embodiment 1

[0022] Examples 1 to 2 and Comparative Examples 1 to 4 are examples in which PESA is used alone in water for carbon steel. The test results of PESA dosage, water quality and corrosion inhibition performance are listed in Table 1. Embodiment 3~Example 12 and Comparative Example 5~Comparative Example 19 are that carbon steel uses PESA and gluconic acid (or gluconate) and zinc salt (Zn 2+ ) The example of the ternary formulation, the water quality is the same as in Example 1, and the consumption and corrosion inhibition performance test results of the ternary formulation are listed in Table 2. The conditions of Comparative Example 5 to Comparative Example 19 are the same as that of Example 3 except that the amount of the ternary formula is different, and the test results of corrosion inhibition performance are listed in Table 2.

[0023] It can be seen from Table 1 that PESA has a certain corrosion inhibition effect on carbon steel at a low dosage of 5%. With the increase of the ...

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Abstract

The present invention is water treating method with polyepoxy succinic acid as scale and corrosion inhibitor alone or through matching with gluconic acid or gluconic acid or gluconate and zinc acid. The amount of polyepoxy succinic acid of the molecular weight of 400-1000 alone as scale and corrosion inhibitor has the amount of 90-120 mg / L. The ternary scale and corrosion inhibitor comprises polyepoxy succinic acid of the molecular weight of 400-1000 in 30-50 mg / L, gluconic acid, sodium gluconate or calcium gluconate in 5-8 mg / L, and zinc salt in 5-8 mg / L; and has the mass ratio among polyepoxy succinic acid, gluconic acid, sodium gluconate or calcium gluconate, and zinc salt of 1 to 0.16-0.26 to 0.16-0.26. The present invention is one environment friendly water treating scale and corrosion inhibiting method.

Description

technical field [0001] The invention relates to water treatment technology, and is a corrosion and scale inhibition method containing polyepoxysuccinic acid, which is mainly used for industrial water treatment. Background technique [0002] Polyepoxysuccinic acid (PESA) is a water-soluble polymer with strong chelating and scale-inhibiting properties. The structural formula of PESA proposed by the US patent "Ether hydroxypolycarboxylate detergencybuilders" [US4,654,159 (1987-3-31)] is: [0003] [0004] In the formula, M is H, NH 4 or an alkali metal cation, R is H or C 1-4 Alkyl, n is from 2 to 15, more preferably 2 to 10, most preferably 2 to 4. The molecular structure does not contain phosphorus and nitrogen elements, will not cause eutrophication of water bodies, has good biodegradability, and is a green polymer. [0005] The water treatment formulation of the existing PESA system has been developed, and the U.S. patent "Method of inhibiting corrosion in aqueous sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/10
Inventor 熊蓉春周庆魏刚
Owner BEIJING UNIV OF CHEM TECH
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