Preparation method of corrosion inhibitor for inhibiting corrosion of supercritical CO2 to low-carbon microalloyed steel

A kind of alloy steel, supercritical technology, applied in the field of preparation of imidazoline corrosion inhibitor and its derivatives, to achieve the effect of less dosage, simple production and corrosion control

Inactive Publication Date: 2014-06-25
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Currently, there are no studies on the suppression of supercritical CO 2 Corrosion inhibitors for the corrosion of low carbon microalloyed steels under the conditions,

Method used

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  • Preparation method of corrosion inhibitor for inhibiting corrosion of supercritical CO2 to low-carbon microalloyed steel
  • Preparation method of corrosion inhibitor for inhibiting corrosion of supercritical CO2 to low-carbon microalloyed steel
  • Preparation method of corrosion inhibitor for inhibiting corrosion of supercritical CO2 to low-carbon microalloyed steel

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Embodiment Construction

[0019] First, add higher fatty acid into the three-necked flask equipped with condensing reflux device, water separator and serpentine condenser tube, vacuumize, N 2 permutation 3 times, at N 2 Under the protection of gas, add an appropriate amount of polyethylene polyamine and water-carrying agent, and heat up until the reaction enters the acylation stage; then continue to heat up to the dehydration and ring-forming temperature after the acylation reaction, and heat until the end of the reaction; vacuum distillation removes The excess water-carrying agent and water in the product can be recrystallized to obtain imidazoline. An imidazoline derivative can be obtained by first reacting imidazoline with a quaternizing agent and then reacting the product with thiourea. Specific steps are as follows:

[0020] (1) The preparation method of imidazoline:

[0021] The preparation of imidazoline is carried out in an oxygen-free environment, and its preparation raw materials are highe...

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Abstract

The invention discloses a preparation method of a corrosion inhibitor for inhibiting corrosion of supercritical CO2 to low-carbon microalloyed steel, belonging to the field of corrosion resistance. The preparation method comprises the steps of firstly, adding higher fatty acid into a three-neck flask provided with a condensation and reflux device, a water separator and an S-shaped condensation pipe, vacuumizing, replacing N2 2-4 times, adding a proper amount of polyethylene polyamine and a water-carrying agent under the protection of N2 gas, and heating until the reaction enters an acylation stage; then, continuing to heat to a cyclodehydration temperature after the acylation reaction is ended, and heating until the reaction is ended; carrying out reduced pressure distillation to remove redundant water-carrying agent and water in the product, and recrystallizing to obtain the corrosion inhibitor imidazoline. An imidazoline derivative is prepared through the steps of reacting for 3h while continuously stirring imidazoline and benzyl chloride at the temperature of 50-90 DEG C according to the molar ratio of 1:1.1; after the reaction is ended, adding thiourea with the same molar weight as imidazoline, heating to 90-110 DEG C, continuously stirring and reacting for 1.5-2h. The corrosion inhibitor is low in dosage, free of pollution, simple in production, incapable of injuring human bodies and capable of effectively controlling the corrosion of supercritical CO2 to low-carbon microalloyed steel.

Description

technical field [0001] The invention relates to a method for suppressing CO in low-carbon microalloyed steel 2 The preparation method of the corrosion inhibitor, especially the preparation method of the imidazoline corrosion inhibitor and its derivatives. Background technique [0002] CO 2 Soluble in water is extremely corrosive to steel, this is because under the same pH conditions, CO 2 The acidity of the aqueous solution is higher than that of hydrochloric acid, so the corrosion of steel is more serious than that of hydrochloric acid. CO 2 Corrosion can cause general corrosion and partial corrosion of steel, causing early failure of pipelines and equipment, and causing serious consequences, not only causing huge economic losses, but also causing serious social consequences, endangering the lives of the people. Therefore, for the suppression of CO 2 The study of corrosion has profound practical significance. Currently, suppression of CO 2 Corrosion techniques genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/14
CPCC23F11/149
Inventor 高克玮张欢欢庞晓露
Owner UNIV OF SCI & TECH BEIJING
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