METHOD FOR PREPARING INHIBITED HYDROCHLORIC ACID Russian patent published in 2003 - IPC

FIELD: chemical technology. SUBSTANCE: invention relates to production of inhibited hydrochloric acid used in oil production for treatment of critical zone of petroleum and water-forcing holes. Method for preparing inhibited hydrochloric acid involves its dilution with water and addition primary aliphatic amines of the formula NH₂R or mixture of primary and secondary amines of the formula NHR₂ to acid where R means alkyl with number of hydrocarbon atoms C₈-C₂₀ or isoalkylamines with branched structure of amines of fraction C₁₂-C₁₈ and additional addition of non-ionogenic surface-active substance and formaldehyde-containing compound. Alternatively, before addition of nitrogen-containing component to hydrochloric acid an aqueous solution this component is mixed preliminary with portion of hydrochloric acid in the ratio mole/mole and non-ionogenic surface-active substance and formaldehyde-containing compound are added to the prepared mixture. Invention provides preparing effective inhibited hydrochloric acid due to formation of inhibitor of acid corrosion in hydrochloric acid in the process for preparing inhibited hydrochloric acid. EFFECT: improved preparing method, enhanced effectiveness of acid. 2 cl, 1 tbl, 24 ex