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Polyethylene polyamines are liquid chemicals characterized by a yellowish color and an amine odor. They exhibit miscibility in water and possess the ability to neutralize acids, forming salts and water. These chemicals, which include diethylenetriamine (DETA), triethylenetetramine (TETA), tetraethylenepentamine (TEPA), and pentaethylenehexamine (PEHA), can react with strong reducing agents, producing flammable gaseous hydrogen.

In terms of compatibility, polyethylene polyamines may be incompatible with various substances such as isocyanates, halogenated organics, peroxides, acidic phenols, epoxides, anhydrides, and acid halides. Notably, they have the potential to neutralize acids in exothermic reactions.

Polyamines, a broader class of molecules, are involved in modulating RNA enzyme activities and are synthesized from amino acids like arginine, ornithine, and methionine. Specific polyethylene polyamines, like triethylenetetramine (TETA) and diethylenetriamine (DETA), have been studied for their protective properties on sulfidic ores. When used alone in dilute solutions or combined with potassium amyl xanthate (p.a.x.), they form an effective protective layer on sulfidic ores, significantly reducing oxidation caused by atmospheric oxygen. Experimental studies have demonstrated their efficacy in preventing oxidation in both small particles and coarse samples when exposed to diluted hydrogen peroxide solutions or atmospheric oxygen as oxidants.