CHEMICAL WATER PURIFICATION FROM ETHANOLAMINE STABILIZED WATER OIL EMULSIONS
We have considered the problems of sewage purification from water oil emulsions represented by lubricant coolants, micelles which are formed by droplets of hydrophobic industrial oil emulsified by oleic acid, stabilized with ethanolamine and nonionic neonol (oxyethylated monoalkylphenol) surfactant. It is shown that the known technologies of water purification from water oil emulsions aren't effective or expensive due to usage of special agents and/or modified (hydrophilic) membranes. It is shown that acidulation of water solution of emulsions due to ethanolamine protonation, it breaks and oleic acid together with the surfactant and ethanolamine are extracted by oil into the top layer. Mechanical removal of top, the oil layer allows complete removal of oil, surfactant, oleic acid and about 70-75% of the initial amount of amine from water. It is shown that the most effective method for removal of residual amine from water is itss destruction by nitrous acid (in vitro) at рН = 3.5-4. The typical changes in the solution absorption spectra in the field of 310-400nm show the formation of quasistable intermediate diazo compounds which gradually decompose within 3 days with nitrogen release. It is shown that ethyl aldehyde isn't formed, and the reaction product is ethylene glycol which is almost unremovable from water. The best way to remove ethylene glycol from water is to prevent its formation. Therefore, the hydrophobic intermediate diazo compound was removed from water using sorption. This prevents ethylene glycol formation. It is shown that 4-fold fractional sorption on charcoal allows removal of amine from water. In this case, the permanganate index of water decreases by 95% and is 300mg of О2/l. The waste sorbents, together with the emitted mix of oil, ethanolamine and surfactant, are used as stove fuel. So, the optimum combination of reagent, extraction, and sorption methods allows effective water purification from oil emulsions stabilized by ethanolamine.