Patent ID: 6103100
Filing Date: 2000-08-15
Classification: C10G

Abstract:
A method for reducing corrosion in an overhead of a crude unit distillation tower distilling crude oil comprising:washing the crude oil with water which contains dissolved therein at least one of:(a) nitrogenous base, said nitrogenous base having an aqueous or alcoholic solution or dispersion pH of at least 11, and comprising at least one of:polyetheramines, polyamines, polyimines, polypyridines, and poly(quaternary ammonium) bases having about 1 to 10 carbon atoms per nitrogen or oxygen and degree of polymerization of about 6 to about 60,000, andhydroxides, carbonates and silicates of alkyl or alkylaryl quaternary amines of 12 to 72 carbon atoms per quaternary nitrogen;(b) di- or multivalent metallic base; and(c) combination of multi-polyether-headed surfactant and a monovalent metallic base;said dissolved bases and combination being effective for reducing concentration of overhead HCl producing species.