Low toxicity corrosion inhibitor

Details Low toxicity corrosion inhibitor Low toxicity corrosion inhibitor

E - Fixed Constructions

21

B

E21B 41/02 (2006.01) C07D 233/42 (2006.01) C09K 8/54 (2006.01) C09K 15/26 (2006.01) C23F 11/16 (2006.01)

Patent

CA 2289539

A water soluble corrosion inhibitor containing a compound having at least one five-membered heterocyclic ring having at least one thione group and at least one other pendant group is described. Such a corrosion inhibiting compound can be made by reacting together a thiourea and a polyalkylene polyamine. A specific example includes preparing 1-(2-aminoethyl)-2-imidazolidinethione by reacting thiourea, per se, and diethylenetriamine. These corrosion inhibition compounds have greatly reduced aquatic toxicity, and may be employed as corrosion inhibitors in hydrocarbon streams.

Inhibiteur de corrosion soluble dans l'eau et contenant un composé possédant au moins un noyau hétérocyclique comportant au moins un groupe thione et au moins un autre groupe pendant. On peut préparer ce composé inhibant la corrosion par réaction d'une thio-urée et d'une polyamine de polyalkylène. Un exemple spécifique consiste à préparer 1-(2-aminoéthyle)-2-imidazolidinethione par réaction de thio-urée et de diéthylènetriamine. Ces composés d'inhibition de la corrosion présentent une toxicité aquatique considérablement limitée et peuvent être utilisés en tant qu'inhibiteurs de corrosion dans des flux d'hydrocarbures.

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