PROCEDURE FOR PRODUCTION OF CORROSION INHIBITORS Russian patent published in 2010 - IPC C23F11/14 

FIELD: machine building.

SUBSTANCE: active base in form of mixture of modified imidazoline (MI) with aldimines, or Schiff bases at weight ratio 50÷90:10÷50 is used in procedure. Also MI is produced at interaction of poly-ethylene-polyamines or polypropylene-polyamines with oleic acid or a-branched monocarbonic acids at mole ratio 1:1 first at temperature 150-170°C during 3-6 h, and then at 250-260°C during 1.5-2 h. Produced imidazolines are cyanethylated with nitrile of acrylic acid or oxyl-alkylated with ethylene or propylene oxide at mole ratio 1:1÷2 at temperature 30-60°C during 3-4 h. Aldimines are produced with condensation of oil or isobutyric, or 2-ethylhexene aldehydes with water solution of ammonia at temperature 90-130°C, pressure 0.15÷0.8 MPa and mole ratio 1:1÷2.0 during 3-4 hours. Schiff bases are produced with condensation of oil or isobutyric, or 2-ethylhexene aldehydes with light fractions of polyamines at temperature 60-100°C, and at mole ratio 1÷2:1 during 5-6 h. Also surface active substance and organic solvent are added into produced active base which is mixed at temperature 20-50°C during 0,5-2 h.

EFFECT: upgraded protection from corrosion, expanded raw materials base and assortment of corrosion inhibitors, also replacement of expensive solvents-aromatic hydrocarbons.

3 cl, 1 tbl, 23 ex