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Corrosion inhibitor and application thereof

A technology of corrosion inhibitor and lauroyl group is applied in the field of corrosion inhibitor and environment-friendly corrosion inhibitor. The method and the simple effect of the process

Inactive Publication Date: 2017-10-24
ENERGY RESOURCES INST HEBEI ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when polyaspartic acid is used alone in concentrated brine, its corrosion inhibition effect is not good

Method used

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  • Corrosion inhibitor and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 13.3 grams of aspartic acid and dissolve it in water, add 29.33 grams of 25% sodium hydroxide solution dropwise under stirring, control the reaction temperature at 30-50°C, and convert aspartic acid into sodium hydrogen aspartate solution; Then add 50 mL of acetone, and slowly add 21.85 g of lauroyl chloride dropwise under stirring, while adjusting the pH to 10.4 with 15% sodium hydroxide solution, the reaction temperature is 30 °C, and the reaction time is 4 hours to obtain a colorless and transparent N- Aqueous solution of sodium lauroyl-L-aspartate. Then use hydrochloric acid to adjust the pH to 1~2, and after standing for 12 hours, filter to obtain a white precipitate of N-lauroyl-L-aspartic acid, wash it with distilled water until neutral, then wash it with absolute ethanol, and dry it. Obtain white N-lauroyl-L-aspartic acid solid powder with a yield of 94.9%; then compound according to the percentage of the active ingredients of each substance in the corrosi...

Embodiment 2

[0033] Weigh 14.63 grams of aspartic acid and dissolve it in water, add 26.4 grams of 27% sodium hydroxide solution dropwise under stirring, and control the reaction temperature to 30-50°C to convert aspartic acid into sodium hydrogen aspartate solution; Then add 50 mL of acetone, and slowly add 21.85 g of lauroyl chloride dropwise under stirring, while adjusting the pH to 11 with 20% sodium hydroxide solution, the reaction temperature is 30 °C, and the reaction time is 3 hours to obtain a colorless and transparent N- Aqueous solution of sodium lauroyl-L-aspartate. Then use hydrochloric acid to adjust the pH to 1~2, and after standing for 12 hours, filter to obtain a white precipitate of N-lauroyl-L-aspartic acid, wash it with distilled water until neutral, then wash it with absolute ethanol, and dry it. Obtain white N-lauroyl-L-aspartic acid solid powder with a yield of 96.4%; then compound according to the percentage of the active ingredients of each substance in the corrosi...

Embodiment 3

[0038] Weigh 15.96 grams of aspartic acid and dissolve it in water, add 23.04 grams of 25% sodium hydroxide solution dropwise under stirring, and control the reaction temperature at 30-50°C to convert aspartic acid into sodium hydrogen aspartate solution; Then add 50 mL of acetone, and slowly add 21.85 g of lauroyl chloride dropwise under stirring, while adjusting the pH to 10.5 with 25% sodium hydroxide solution, the reaction temperature is 35 °C, and the reaction time is 2 hours to obtain a colorless and transparent N- Aqueous solution of sodium lauroyl-L-aspartate. Then use hydrochloric acid to adjust the pH to 1~2, and after standing for 12 hours, filter to obtain a white precipitate of N-lauroyl-L-aspartic acid, wash it with distilled water until neutral, then wash it with absolute ethanol, and dry it. Obtain white N-lauroyl-L-aspartic acid solid powder with a yield of 96.1%; then compound according to the percentage of the active ingredients of each substance in the corr...

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Abstract

The invention discloses application of a corrosion inhibitor, and particularly relates to a corrosion inhibitor for seawater desalination and brine. The corrosion inhibitor is prepared from the following components in parts by weight: 55-75 parts of N-lauroyl-L-sodium aspartate, 10-15 parts of sodium polyacrylate and 15-30 parts of zinc salt, and is prepared by uniformly mixing the N-lauroyl-L-sodium aspartate, the sodium polyacrylate and zinc sulfate. The corrosion inhibitor is applicable to high salinity condition of seawater desalination and brine, and has an inhibition efficiency for A3 carbon steel of over 90 percent when the usage amount is 100mg / L, and is an efficient environment-friendly corrosion inhibitor for seawater desalination and brine.

Description

technical field [0001] The invention relates to a corrosion inhibitor, in particular to an environment-friendly corrosion inhibitor used in the seawater desalination concentrated brine process, and belongs to the technical field of chemical products. Background technique [0002] Seawater desalination is one of the important and effective ways to solve the problem of lack of fresh water resources. Seawater desalination technologies mainly include reverse osmosis, low-temperature multi-effect distillation, multi-stage flash evaporation, electrodialysis, etc., among which reverse osmosis and low-temperature multi-effect distillation are the most important methods in seawater desalination projects. The most widely used method, my country's reverse osmosis desalination technology accounted for 64.18%. In the process of seawater desalination by reverse osmosis, due to the presence of Ca in seawater 2＋ , Mg 2＋ , CO 3 2－ , SO 4 2－ 、PO 4 3－ , Cl - Plasma, with the increase o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/12C02F103/08
CPCC02F5/125C02F2103/08C02F2303/08
Inventor 高玉华刘振法张利辉李海花郭茹辉
Owner ENERGY RESOURCES INST HEBEI ACADEMY OF SCI