The present invention generally relates to compositions and methods for neutralizing acidic streams in an olefin or styrene production plant. More specifically, the invention relates to neutralizing agents for dilution steam systems in the steam cracker process and their use for reducing acid corrosion and fouling in such systems.

Disclosed are succinic anhydride-derived polyester compounds used in compositions and methods for inhibiting corrosion.

Disclosed are succinic anhydride-derived polyester compounds used in compositions and methods for inhibiting corrosion.

A corrosion inhibiting composition and methods of inhibiting corrosion of a metal surface for use in the oil and gas industry. The corrosion inhibitor includes at least one polyamine, an alkanolamine, at least one surfactant, preferably a linear alkyl alcohol ethoxylate, at least one thioglycol compound, and at least one alcohol solvent. The methods include combining effective amounts of the corrosion inhibitor composition and contacting a metal surface in carbon dioxide-containing aqueous environments commonly found in oil and gas industry. The composition is very effective against corrosion of metals in contact with aqueous sweet corrosive brine media when used in a dosage from 50-100 ppm.

A corrosion inhibiting composition and methods of inhibiting corrosion of a metal surface for use in the oil and gas industry. The corrosion inhibitor includes at least one polyamine, an alkanolamine, at least one surfactant, preferably a linear alkyl alcohol ethoxylate, at least one thioglycol compound, and at least one alcohol solvent. The methods include combining effective amounts of the corrosion inhibitor composition and contacting a metal surface in carbon dioxide-containing aqueous environments commonly found in oil and gas industry. The composition is very effective against corrosion of metals in contact with aqueous sweet corrosive brine media when used in a dosage from 50-100 ppm.

Compounds, compositions and methods are provided for reducing, inhibiting, or preventing corrosion of a surface, using a polyester polyamine compound. The polyester polyamine compound having a structure corresponding to Formula 1 or 2, or a salt thereof:

##STR00001##

wherein R.sub.1 is independently alkylene; R.sub.2 is independently hydrogen or —COR.sub.4; R.sub.3 is independently alkyl, alkenyl, aryl, or alkaryl; R.sub.4 is independently alkyl or alkenyl; R.sub.10 and R.sub.11 are each independently hydrogen, alkyl, or alkaryl; m is an integer from 1 to 10; n is an integer from 3 to 10; and wherein at least one R.sub.2 is —COR.sub.4.

The present disclosure provides a bis-quaternary ammonium salt of Formula I ##STR00001##
wherein A is selected from O, NH, S, C(O), C(NH) or C(S); R.sub.1 and R.sub.2 are independently selected from C.sub.1-3 alkyl or H; R.sub.3 is C.sub.1-16 alkyl, C.sub.13-20 aralkyl or C.sub.2-16 allyl; X.sup.− is selected from chloro, bromo, iodo, hydroxide, nitrate or sulphate; and n and m are independently 1 to 6. Furthermore, a corrosion inhibition formulation comprising said bis-quaternary ammonium salt is revealed. Also, convenient processes for the preparation of the salt of Formula I and the formulation are provided.

The present disclosure provides a bis-quaternary ammonium salt of Formula I ##STR00001##
wherein A is selected from O, NH, S, C(O), C(NH) or C(S); R.sub.1 and R.sub.2 are independently selected from C.sub.1-3 alkyl or H; R.sub.3 is C.sub.1-16 alkyl, C.sub.13-20 aralkyl or C.sub.2-16 allyl; X.sup.− is selected from chloro, bromo, iodo, hydroxide, nitrate or sulphate; and n and m are independently 1 to 6. Furthermore, a corrosion inhibition formulation comprising said bis-quaternary ammonium salt is revealed. Also, convenient processes for the preparation of the salt of Formula I and the formulation are provided.

A composition comprising a) a quaternary trialkylalkanolamine hydroxide and b) at least one diamine as component b), which is selected from the group consisting of 1-amino-4-methylpiperazine, 1,2-diaminopropane and mixtures thereof.

A composition comprising a) a quaternary trialkylalkanolamine hydroxide and b) at least one diamine as component b), which is selected from the group consisting of 1-amino-4-methylpiperazine, 1,2-diaminopropane and mixtures thereof.