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A kind of methionine derivative corrosion inhibitor for iron and steel pickling and its synthesis method

A synthesis method and methionine technology are applied in the field of methionine derivative corrosion inhibitor and its synthesis, which can solve the problems of poor water solubility of the final product, and achieve the effects of good corrosion inhibition effect, good water solubility and strong adsorption force.

Active Publication Date: 2019-02-01
宁波德诚工具有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Fmoc-methionine amide is mainly used as a corrosion inhibitor in neutral NaCl solution, and methionine derivative corrosion inhibitors used in pickling solutions have not been reported yet.
In addition, because Fmoc-methionine amide introduces two benzene rings and 18 carbon long-chain hydrocarbon groups on the methionine molecule, the water solubility of the final product is not good

Method used

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  • A kind of methionine derivative corrosion inhibitor for iron and steel pickling and its synthesis method
  • A kind of methionine derivative corrosion inhibitor for iron and steel pickling and its synthesis method
  • A kind of methionine derivative corrosion inhibitor for iron and steel pickling and its synthesis method

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preparation example Construction

[0026] 1) Preparation of thionyl chloride-methanol solution

[0027] Add 150mL of methanol to the reaction vessel, cool it in an ice-salt bath to below -10°C, and add 21.60mL of thionyl chloride dropwise under electromagnetic stirring. In order to avoid the chemical reaction between methanol and thionyl chloride, the dropping rate should be controlled The reaction temperature did not exceed 0°C, and after 1 hour of reaction, it was naturally raised to room temperature to obtain 150 mL of 2 mol / L thionyl chloride-methanol solution. Transfer the above solution to a brown reagent bottle, seal it, and store it away from light.

[0028] 2) Synthesis of methionine methyl ester hydrochloride

[0029] Install a reflux condenser, a dropping funnel and a thermometer on the three-necked container. Add 50mL of methanol into the reaction bottle, cool it to below -10°C with an ice-salt bath, slowly add 3.6mL of thionyl chloride dropwise under stirring, control the dropping speed and react...

Embodiment 1

[0039] The pickling solution is 0.5mol / L sulfuric acid, and the pickling temperature is 30°C. Add 2-amino-3-methylthio-N-octyl-butyramide to the pickling solution, and the concentration of corrosion inhibitor added to each liter of pickling solution is 50mg / L. Immerse the carbon steel sheet in the pickling solution After 8 hours, after the experiment, remove the carbon steel sheet, clean the surface, dry it with cold air, and calculate the corrosion inhibition rate.

[0040] Conclusion: The calculated corrosion inhibition rate is 95%, indicating that the corrosion inhibitor has a good corrosion inhibition effect.

Embodiment 2

[0042] The pickling solution is 0.5mol / L sulfuric acid, and the pickling temperature is 30°C. Add 2-amino-3-methylthio-N-octyl-butyramide to the pickling solution, and the concentration of corrosion inhibitor added in each liter of pickling solution is 100mg / L. Immerse the carbon steel sheet in the pickling solution After 8 hours, after the experiment, remove the carbon steel sheet, clean the surface, dry it with cold air, and calculate the corrosion inhibition rate.

[0043] Conclusion: The calculated corrosion inhibition rate is 98%, which shows that the corrosion inhibitor has a good corrosion inhibition effect.

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Abstract

The invention relates to a methionine derivate corrosion inhibitor for steel pickling and a compounding method thereof. The name of the methionine derivate corrosion inhibitor is 2-amino-3-methylmercapto-N-octyl-butyrylamide. The derivate is capable of spontaneously and effectively absorbing the steel surface, is principal in chemical absorption and is higher in adsorption capacity. The introduced carbon chain contains 8 carbon atoms, so that the derivate is higher in water solubility in the use concentration scope and the inhibition efficiency is above 98%.

Description

technical field [0001] The invention generally relates to a pickling corrosion inhibitor, in particular to a methionine derivative corrosion inhibitor used for steel pickling and a synthesis method thereof. Background technique [0002] Steel corrosion is an extremely important destructive factor in acid environments such as pickling rust removal, process equipment pickling and descaling, and acid oil recovery. In order to prevent severe corrosion caused by pickling, adding corrosion inhibitor is a very simple and effective method. With the increasing awareness of environmental protection and the continuous improvement of environmental regulations, there is an urgent need to develop non-toxic, harmless and biodegradable corrosion inhibitors to replace those toxic corrosion inhibitors that were used earlier. Natural corrosion inhibitors extracted from plants and some non-toxic and harmless organic corrosion inhibitors have been applied in many corrosion systems. The applica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C323/25C07C319/20C23G1/06C23G1/08
CPCC07C319/20C07C323/25C23G1/065C23G1/081
Inventor 田会娟曹玉霞郭丰艳
Owner 宁波德诚工具有限公司
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