Mono and bis-ester derivatives of pyridinium and quinolinium compounds as environmentally friendly corrosion inhibitors

Abstract

A quaternary nitrogen-containing corrosion inhibitor of formulawhereinis an aromatic, nitrogen-containing ring of 5 to 14 ring atoms, optionally containing an additional N, O or S ring atom and optionally substituted with one or more alkyl, alkenyl, aryl, arylalkyl, cycloalkyl, amino, aminoalkyl, alkoxy, hydroxylalkyl, or cyano groups, or a mixture thereof, Y is a group of formula —OC(O)R1 or —C(O)R1; L is C1-C10 alkyl, C2-C10 alkenyl or a group of formula CH2CH(OR2)CH2—; R1 is C8-C20 alkyl or C8-C20 alkenyl; R2 is H or C(O)R1; R3 and R4 are independently selected from H, alkyl, alkenyl, amino, alkoxy, hydroxylalkyl and cyano; and X is Br, Cl or I is particularly useful for inhibiting corrosion in oil and gas field applications.

Description

TECHNICAL FIELD

[0001] This invention relates to novel quaternary nitrogen compounds and compositions comprising the compounds which are useful as corrosion inhibitors, particularly in oil and gas field applications and more particularly in situations where they may come into contact with the natural environment, and to a method of inhibiting corrosion using the compounds.BACKGROUND OF THE INVENTION

[0002] Stringent environmental constraints imposed by government regulation upon the oil and gas producing industry has led to the need for new “greener” chemistries, which have less environmental impact. This environmental drive has been spearheaded by North Sea Regulators such as CEFAS, and due to their success similar programs are being implemented in other oil producing regions. Operators now demand identical levels of performance with existing treatments along with the fulfillment of the new environmental criteria for any chemicals that may be contained, for example, in rig overboard di...

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