METHOD OF PRODUCING ANTICORROSION MATERIAL Russian patent published in 1997 - IPC

FIELD: production of anticorrosion agents. SUBSTANCE: asphalt from deasphalting process is mixed with still residue of dimethylformaldehyde recovery stage in isoprene production process and sulfuric acid in three steps: first at 120-125 C for 210 min, then at 150 C for 240 min, and finally at 160-180 C for 240 min. Sulfuric acid is evenly entered in the first step with rate 20-35 kg/h per 1 t of reaction mass. Concentration of components is: 75-85 wt % asphalt, 10-15 wt still residue, and sulfuric acid to the balance. EFFECT: enhanced efficiency of process. 4 tbl