FIELD: reduction of ferric sulfide deposits in pipe lines.
SUBSTANCE: proposed method consists in bringing the inner surfaces of pipe in contact with composition prepared from aqueous solution containing the compounds given in formula (I): 
, where X is anion whose valence "n" is selected from definite group and at least one amine selected from group including alkyl amines, dialkyl amines, alkylen diamines, cycloalkyl amines or their conjugates with acids. According to another version, use is made of composition containing tris(hydroxymnethyl) phosphine, at least one amine or its conjugate with acid and solvent. In presence of composition, fast complexation takes place; as a result, ferric sulfide deposits are dissolved and are removed from pipe.
EFFECT: possibility of using safe, available and inexpensive materials ensuring deposition of polymers.
72 cl, 1 tbl
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