Patent ID: 6281328
Filing Date: 2001-08-28
Classification: C10G

Abstract:
A method for decreasing the acidity of an acidic crude oil, comprising: contacting a starting acid-containing crude oil or fraction having a neutralization number of from 0.2 to 10 mg KOH/g with an effective amount of a crosslinked polymeric amine having pKa greater than 9 and selected from the group consisting of polyvinylamine and anion-exchange resins containing amino groups, and wherein the molar ratio of amine groups in the crosslinked polymeric amine to acid groups is from 0.1 to 20 to produce a treated crude oil having a decreased acid content and a crosslinked polymeric amine having acid groups attached thereto, recovering the crosslinked polymeric amine with acid groups attached and regenerating the crosslinked polymeric amine to recover the acids.