Two-step heterocyclic nitrogen extraction from petroleum oils

Patent · Tue Dec 13 04:00:00 EST 1988

OSTI ID:6435804

Madgavkar, A M; Washecheck, D M

This patent describes a process for the removal of heterocyclic nitrogen compounds from a petroleum crude oil which comprises treating a petroleum crude oil rich in basic heterocyclic nitrogen compounds in a two-phase extraction zone comprising an extractant consisting essentially of an aqueous solution of a lower carboxylic acid in a concentration of from about 20 up to 95 weight percent in the aqueous phase, at separation conditions, to extract at extraction conditions the basic heterocyclic nitrogen compounds with the lower carboxylic acid and thereby remove at least a portion of the basic heterocyclic nitrogen compounds from the petroleum crude oil and to form a first extraction stream comprising a petroleum crude oil with a lean content of basic heterocyclic nitrogen compounds and a second extraction stream comprising an aqueous phase containing the lower carboxylic acid and having an increased content of basic heterocyclic nitrogen compounds, passing the first separation stream to a catalytic hydrotreatment zone to hydrotreat the petroleum crude oil in the presence of hydrogen and a catalytic composition of matter, at hydrotreatment conditions, to remove basic heterocyclic nitrogen compounds and recovering a hydrotreated petroleum crude oil stream having a lower content of basic heterocyclic nitrogen compounds than present in the first separation stream having a lean content of basic heterocyclic nitrogen compounds.

• Assignee: Shell Oil Co., Houston, TX
• Patent Number(s): US 4790930
• OSTI ID: 6435804
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ACIDIFICATION
AQUEOUS SOLUTIONS
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
DENITRIFICATION
DISPERSIONS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROGENATION
MIXTURES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PETROLEUM
REMOVAL
SEPARATION PROCESSES
SOLUTIONS