«Green» chemistry methods in synthesis of flotation agents

Abstract

A review of the authors' own works devoted to the development of «green» methods of chemistry in the synthesis of various derivatives of monoethanolamine and diethanolamine, which are potential surface active substances and flotation agents, is made up. It is shown that the application of the «green» chemistry principles, for example, implication of 5 molar % an organic phase transfer catalyst — tetrabutylammonium iodide in alkylation reactions makes it possible to significantly increase (in two to three times) the yields of target substances N-alkylated derivatives of diethanolamine and monoethanolamine with a tenfold reduction in the duration of reactions and a lowering of the process temperature, which leads to a significant reduction in energy and labor costs. Synthesis of target flotation agents, for example, O-2-((dimethoxyphosphoryl)- (2-hydroxyethyl)amino)ethylxanthate and sodium 2-dimethoxyphosphoryloxyethyl carbamate by the atomeconomic method — four-component reaction of the one-reactor interaction with a reduction in the number of stages from two to one also contributes to an increase in the total yield of target substances by 2–3 times.