Method and compositions for inhibition of naphthenic acid...

C - Chemistry – Metallurgy – 10 – G

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C10G 7/10 (2006.01)

Patent

CA 2651507

Corrosion induced by the presence of naphthenic acid in hydrocarbon fluids, particularly where such fluids are at elevated temperatures, may be inhibited or controlled through use of corrosion inhibiting compositions comprising a combination of a minor portion of a phosphorus-based constituent and a major portion of a sulfur-based constituent, nitrogen-based constituent, or combination thereof. In another embodiment the sulfur-based constituent and/or nitrogen-based constituent may be used without any phosphorus-based constituent. Where the compounds are appropriately selected, the compositions may inhibit corrosion to a degree comparable or nearly comparable to the inhibition provided by an equal amount of some conventional phosphorus-based compounds alone, but are significantly less likely to impair catalyst activity in downstream cracking and refining operations.

La corrosion induite par la présence d'acide naphténique dans des fluides hydrocarbures, en particulier quand ces fluides sont à hautes températures, peut être inhibée ou contrôlée par l'utilisation de compositions inhibant la corrosion, comprenant une combinaison d'une portion mineure d'un constituant à base de phosphore et d'une portion majeure d'un constituant à base de soufre, d'un constituant à base d'azote, ou une combinaison de ceux-ci. Dans un autre mode de réalisation, le constituant à base de soufre et/ou le constituant à base d'azote peuvent être utilisés sans aucun constituant à base de phosphore. Quand ces composés sont convenablement choisis, les compositions peuvent inhiber la corrosion à un degré comparable ou quasi comparable avec l'inhibition fournie par une quantité équivalente de certains composés à base de phosphore conventionnels seuls, mais ils sont nettement moins susceptibles d'altérer l'activité de catalyseur dans les opérations de craquage et de raffinage en aval.

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