Synthesis and inhibitory properties of compositions based on boric acid, mixture of individual polyethylene polyamines and hexamethylenetetramine

A novel corrosion inhibitor, hexamethylenetetramine quaternary ammonium salt, is synthesized using hexamethylenetetramine (HMTA) and bromohexane as main reactants. The inhibitive action of HQAS on QT800-2 steel in hydrochloric acid medium is evaluated by weight-loss method, electrochemical method, and quantum chemical calculation. The obtained results show that the efficiency of 0.5 wt% HQAS inhibitor in 30 wt.% HCl solution at 363 K is 92.95% and HQAS can form an excellent synergistic effect with some additives. Polarization curves reveal that HQAS behaves as a mixed-type inhibitor with dominant anodic inhibition. Furthermore, the theoretical calculation verifies the relationship between the HQAS molecular structure and corrosion inhibition properties. K E Y W O R D Sacid inhibition, acid solutions, polarization, QT800-2 steel, quantum chemical calculation

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“…HMTA is also known as a corrosion inhibition synergist . However, few research have been devoted to the HMTA quaternization.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and evaluation of hexamethylenetetramine quaternary ammonium salt as corrosion inhibitor

Liu

Qiu

Shao

et al. 2019

Materials & Corrosion

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The Ugly Duckling Metamorphosis: The Ammonia/Formaldehyde Couple Made Possible in Ugi Reactions.

et al. 2021

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Ugi reactions are still a challenge when the concomitant use of ammonia and formaldehyde is required. Herein, we propose a strategy to overcome this challenge using hexamethylenetetramine (HMTA) as a singular key for the employment of these two simple starting materials in the Ugi reaction. Acylaminoacetamide derivatives were prepared in good to excellent yields by this new methodology. The scope and optimization of the reaction conditions were investigated. This novel methodology was successfully applied in the synthesis of two different diketopiperazines (DKPs) using the Ugi/Deprotection + Activation/Cyclization (UDAC) method. A continuous flow approach was also used in this methodology.

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Synthesis and crystal structures of three inclusion compounds of 2, 2’-bis (4-hydroxyphenyl) propane and tetraalkylammonium

Yang

Xia

Zhang

et al. 2020

Molecular Crystals and Liquid Crystals

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Synthesis and inhibitory properties of compositions based on boric acid, mixture of individual polyethylene polyamines and hexamethylenetetramine

Cited by 3 publications

References 1 publication

Synthesis and evaluation of hexamethylenetetramine quaternary ammonium salt as corrosion inhibitor

Synthesis and evaluation of hexamethylenetetramine quaternary ammonium salt as corrosion inhibitor

The Ugly Duckling Metamorphosis: The Ammonia/Formaldehyde Couple Made Possible in Ugi Reactions.

Synthesis and crystal structures of three inclusion compounds of 2, 2’-bis (4-hydroxyphenyl) propane and tetraalkylammonium

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