INHIBITOR OF CORROSION OF STEEL Russian patent published in 1997 - IPC

FIELD: protection against corrosion with the help of inhibitors; oil recovery and oil processing. SUBSTANCE: vat residue of caprolactam production together with residue of asphalt-resinous oil of fraction of 110-540 C or residue of prebitumen wide fraction of asphalt-bitumen plants or residue of extract of heavy sulfurous-nitrous fraction of asphalt-resinous oil is used as inhibitor of corrosion. Said vat residue is prepared at stage of synthesis of benzoic acid of toluene or product "T" and hydrocarbon solvent (acetone, alcohol-acetone mixture, quinoline or its derivatives of amide of quinoline carboxylic acid). By using proposed inhibitor it is possible to carry out simultaneous protection against hydrogen absorption in acid hydrogen sulfide medium. EFFECT: improved protection against corrosion. 4 cl, 1 tbl