FIELD: absorption purification of gases. SUBSTANCE: carbon dioxide and hydrogen sulfide are absorbed by aqueous solution of sodium hydroxide, the process takes place at high temperature, waste solution being treated with fraction of aromatic hydrocarbons. Aqueous phase of sodium hydroxide is separated by sustaining and cooled to 1-10 C, sodium carbonate being crystallized. Precipitate of sodium carbonate is separated of mother solution and washed at 1-10 C with the help of concentrated solution of sodium hydroxide. Mother solution is heated to 40-80 C, portion of said solution is returned for absorption. Residual portion of mother solution is mixed with mentioned above washing solution. Thus prepared mixed solution of sodium hydroxide is blown with gas which contains hydrogen sulfide. The process is carried out till saturation by hydrogen sulfide is 0.3-0.5 moles per 1 mole of sodium hydroxide. Elementary sulfur is added into thus prepared saturated solution, its quantity being 1-3 moles per 1 mole of sodium sulfide. Thus prepared suspension is mixed to complete dissolving of sulfur, sodium polysulfides being produced. Said process takes place at 40-80 C. EFFECT: improves efficiency of the method. 3 cl, 1 dwg, 2 tbl
