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Corrosion inhibitor for inhibiting chlorine dioxide corrosion and preparation method thereof

A technology of chlorine dioxide and corrosion inhibitor, which is applied in the field of metal preservative preparation, can solve the problems of impractical application, impracticality, and reduced activity of biological enzymes, and achieves the effect of excellent thermal stability and a wide range of application systems

Active Publication Date: 2014-04-09
SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the biological enzyme introduced in this method can be used in the range of pH 2-10, the change of temperature can reduce the activity of the biological enzyme, so it cannot be applied to high temperature conditions
In addition, the patent text of CN102257053A has also disclosed a polyolefin composition, which has the effect of improving the resistance caused by water containing chlorine dioxide, and the pipe made of the polyolefin composition can improve the resistance to chlorine dioxide. Tolerance, but in many actual production conditions, it is obviously not practical to completely replace the pipe to prevent chlorine dioxide corrosion

Method used

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  • Corrosion inhibitor for inhibiting chlorine dioxide corrosion and preparation method thereof
  • Corrosion inhibitor for inhibiting chlorine dioxide corrosion and preparation method thereof
  • Corrosion inhibitor for inhibiting chlorine dioxide corrosion and preparation method thereof

Examples

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Effect test

preparation example

[0021] Chlorine dioxide corrosion inhibitors were prepared according to the weight of each component given in Table 1, and the raw materials in Table 1 were added to the reaction kettle in sequence, and stirred at 50°C for 30 minutes to prepare four kinds of chlorine dioxide corrosion inhibitors HJ01, HJ02, HJ03 and HJ04. Chlorine oxide corrosion inhibitors, as shown in Table 1.

[0022] Table 1: Composition of different chlorine dioxide corrosion inhibitors

[0023]

[0024] In this example, amino methylene phosphate (salt) HJ01 uses ethylenediamine methylene phosphonate, HJ02 uses diethylene triamine methylene phosphonate, HJ03 uses hexamethylene diamine methylene phosphonate, HJ04 uses double 1, 6-hexamethylene triamine methylene phosphonic acid, non-ionic surfactants HJ01 and HJ02 use OP-10, HJ03 and HJ04 use AEO-9, and hydrocarbon imidazoline use 1-benzyl 1-aminoethyl-2-heptyl Alkyl imidazoline quaternary ammonium salt.

Embodiment 2

[0026] Evaluation of compound chlorine dioxide corrosion inhibitor containing aminomethylene phosphate (salt) Soak in chlorine dioxide solution for 30 minutes; for disinfection of articles contaminated by hepatitis virus and Mycobacterium tuberculosis, soak in 500 mg / L chlorine dioxide for 30 minutes; for disinfection of articles contaminated by bacterial spores, soak in 1000 mg / L chlorine dioxide for 30 minutes. The determination of the corrosivity of disinfectants to metals has specified the corrosivity level in the specification. Experimental conditions: 25°C, 72h.

[0027] According to the specification, under the condition that the concentration of chlorine dioxide is 100ppm, different concentrations of HJ03 are used to test five kinds of test pieces. The test results include weight loss (g), corrosion rate (mm / a), and corrosion level. The test results are shown in Table 2.

[0028] Table 2: Experimental results of compound chlorine dioxide corrosion inhibitor at 100ppm...

Embodiment 3

[0041] Evaluation of compound chlorine dioxide corrosion inhibitor containing aminomethylene phosphate (salt): The water samples with different concentrations of chlorine dioxide corrosion medium were selected as the test medium in the experiment. Test piece: N80 steel, temperature: 45±1°C, time: 4h, corrosion inhibitor addition amount: 100ppm. The experimental results are shown in Table 6.

[0042] Table 6: Evaluation results of laboratory corrosion inhibition performance of aminomethylene phosphate

[0043]

[0044] It can be seen from Table 6 that the chlorine dioxide corrosion inhibitor compounded with aminomethylene phosphate (salt) as the main agent, under the conditions of different concentrations of chlorine dioxide medium and the lower addition amount, has the best effect on N80 Metal materials represented by steel have high corrosion inhibition effect. The corrosion ability of the corrosion system to metal is greatly reduced.

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Abstract

The invention relates to a corrosion inhibitor for inhibiting corrosion of a chlorine dioxide (ClO2) medium on equipment. The corrosion inhibitor is prepared by amino methylene phosphoric acid or amino methylene phosphate, hydrocarbon imidazoline quaternary ammonium salt, a nonionic surfactant, hexamethylenetetramine and a solvent. An amino methylene phosphoric acid (phosphate) compound with excellent surface activity and metal equipment corrosion inhibition performance is taken as a main agent of the corrosion inhibitor for inhibiting chlorine dioxide corrosion. Compared with the conventional like product, the corrosion inhibitor has the advantages of high-efficiency corrosion inhibition, low toxicity, environmental protection, excellent thermal stability, wide application range and the like, and can effectively alleviate the problem of the chlorine dioxide medium on the equipment in the production, pipeline transportation and storage processes in the industries of petrochemical water treatment and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of metal antiseptics, and relates to a corrosion inhibitor for inhibiting the corrosion of metal equipment by chlorine dioxide and a preparation method thereof. Background technique [0002] Chlorine dioxide (ClO 2 ) is an excellent fungicide, because ClO 2 It has strong oxidation and the highest redox potential, and has the characteristics of low concentration, good bactericidal effect, long duration of drug properties, more thorough elimination of germs, and is not affected by the degree of bacterial resistance. Therefore, it has been used in circulating cooling water treatment, medical treatment, etc. Sanitation, aquaculture, environmental protection, petrochemical water treatment and other fields have been widely used. With the adoption of new technology, chlorine dioxide has also been used as a plugging agent in the process of oil exploitation in recent years, and its strong oxidation e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/04C23F11/167
Inventor 侯雯雯陈晓东杨东元许磊
Owner SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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