METHOD OF PURIFYING CRUDE OIL AND GAS CONDENSATE TO REMOVE HYDROGEN SULFIDE AND MERCAPTANS Russian patent published in 2001 - IPC

FIELD: crude oil treatment. SUBSTANCE: hydrogen sulfide and low- molecular mercaptans contained in crude oil and gas condensate are oxidized by 10-50% hydrogen peroxide solution into elementary sulfur, thiosulfates, and disulfides in presence of alkali agents and catalysts at temperature between 0 and 70 C and pressure up to 1.0 MPa. To stirred mixture, first catalysts in alkali agent solution and then hydrogen peroxide are added, said alkali agent (NaOH, KOH, Na₂CO₃,K₂CO₃,NH₄OH, or nitrogen-containing organic base, namely C2-C6-amines) being added in amounts from 0.1 to 3.0 mole per 1 mole of hydrogen sulfide and mercaptan sulfur and said catalysts (VI-VIII group metals with variable valence) being added in amounts from 0.1 to 50 g per 1 t of raw material. EFFECT: increased degree of purification, especially from low-molecular mercaptans, and reduced consumption of reagents. 4 cl, 3 tbl