Abstract: The invention relates to the use of salts of compound of the formula (1) and amines of the formula (2), where R1 means C8- to C30-Alkyl or C8- to C30-Alkenyl, R2 means hydrogen or a group of the formula —(A—O)x—H, R3, R4 mean hydrogen, C1- to C4-Alkyl or a group of the formula —(A—O)x—H, A means C2- to C4-Alkylene, and x means a number from 1 to 10, as water-soluble or water-dispersible corrosion inhibitors.

Abstract: The invention relates to the use of salts of compounds of the formula (1) having amines of the formula (2), wherein R1 represents C8- to C30-Alkyl or C8- to C30-Alkenyl, R2 represents hydrogen, C1- to C6-Alkyl or an organic radical having 1 to 8 carbon atoms and comprising hetero atoms, and R3, R4 forming a cycle having 5 to 7 ring atoms, wherein said cycle can optionally comprise, in addition to carbon atoms, an oxygen atom or a nitrogen atom or both, as water-soluble or water-dispersible corrosion inhibitors.

Abstract: The invention provides for the use of substituted polyethyleneimines containing structural units of the formula (1), where R1 is H, C1-C30-alkyl, C1-C30-alkenyl or C7-C30-alkylaryl R2, R3, R4, R5 are each independently H or C1-C6-alkyl, in amounts of from 0.01 to 2% by weight to prevent the formation of gas hydrates in aqueous phases which are in contact with a gaseous, liquid or solid organic phase.

Abstract: The invention provides compounds of the formula 1 in which A is a C2- to C4-alkylene group x is from 1 to 100 R1 is C1-C30-alkyl, C2-C30-alkenyl, C7-C30-alkylaryl R2 is an aliphatic, cycloaliphatic or aromatic radical which contains at least one structural unit of the formula 2 ?and y is from 0 to 100, with the proviso that y is from 1 to 100 when R2 is of the formula 2, and their use in amounts of from 0.01 to 2% by weight for preventing the formation of gas hydrates in aqueous phases which are in contact with a gaseous, liquid or solid organic phase.

Abstract: The invention provides for the use of 1-alkyl-5-oxopyrrolidine-3-carboxylic esters, preparable by esterifying alcohols having from 1 to 100 hydroxyl groups with 1-alkyl-5-oxopyrrolidine-3-carboxylic acid, in amounts of from 0.01 to 2% by weight for preventing the formation of gas hydrates in aqueous phases which are in contact with a gaseous, liquid or solid organic phase.