At present, for the purification of gases from sulfur compounds, amine solutions are mainly used, which become contaminated during operation, which entails a number of technological problems. We have chosen a list of key indicators characterizing the degree of contamination of solutions, which consists of the concentration of thermostable salts, the mass fraction of chlorine ions, the mass fraction of iron and nickel, and foaming solutions. The article presents a multiple description and essence of methods for determining the indicators of the degree of contamination of solutions. For testing, 10 regenerated MDEA and MEA solutions were selected. For each value obtained, the limit of the total error and the allowable interval of the value were calculated to determine the convergence and adequacy of the measurements. All values fall within the allowable interval, taking into account the characteristic error of MI, which indicates the reliability and expediency of using these methods. Keywords: methylethanolamine; methyldiethanolamine; thermostable salts; corrosion; electrical conductivity; foaming; cleaning; activated carbon; ion-exchange resin.

An urgent problem in oil refineries during amine gas purification is the formation of a degradation product. Which leads to corrosion of equipment, foaming of systems, deterioration of mass transfer, violation of technological standards, and more. This article considers the effect of anion concentrations with which amines form thermostable salts. A number of experiments were carried out in which the gravimetric method was used to determine the corrosion rate of steels 20 and 09G2S. Based on the test results, the limiting concentrations of individual thermostable salts. The article also presents the results of studies of the dependence of the corrosion rate on the pH of solutions, concentrations of methyldiethanolamine and acids. The effectiveness of cleaning on ion-exchange resins on real working solutions of methyldiethanolamine refineries has also been proven. Keywords: thermostable salts; acetate; format; oxalate; corrosion rate; amine; ion exchange; ion exchange resins.