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1. (WO1998051902) LOW TOXICITY CORROSION INHIBITOR

Pub. No.:    WO/1998/051902    International Application No.:    PCT/US1998/009225
Publication Date: Fri Nov 20 00:59:59 CET 1998 International Filing Date: Thu May 07 01:59:59 CEST 1998
IPC: E21B 41/02
C07D 233/42
C23F 11/16
Applicants: BAKER HUGHES INCORPORATED
Inventors: PRINCE, Philippe
Title: LOW TOXICITY CORROSION INHIBITOR
Abstract:
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.