Method for recovery of natural gas liquids

Patent · Tue Sep 22 04:00:00 EDT 1987

OSTI ID:5836290

Montgomery, IV, G J; Aghili, H K

This patent describes a method for recovering natural gas liquids from a fuel gas stream with high hydrogen and carbon dioxide content comprising the steps of: dehydrating the fuel gas stream; compressing the fuel gas stream to a pressure of generally 300 psi; chilling the fuel gas stream in an inlet gas cooler to generally - 45/sup 0/F; separating the chilled, compressed fuel gas stream into a predominantly liquid stream and a predominantly vapor stream; separately reducing the pressure of the liquid and the vapor streams and supplying the separated streams to a demethanizer; raising the temperature of the vapor stream prior to supplying it to the demethanizer; removing cold demethanized residue gas from the top of the demethanizer and cross exchanging the residue gas with the fuel gas stream in the inlet gas cooler to chill the fuel gas stream; removing cold demethanized bottoms product from the bottom of the demethanizer and cross exchanging the demethanized bottoms product with the fuel gas stream in the inlet cooler to chill the fuel gas stream; cross exchanging the demethanized bottoms product downstream of the inlet gas cooler and supplying the cross exchanged demethanized bottoms product to a de-ethanizer; removing a de-ethanized bottoms product from the bottom of the de-ethanizer and cross-exchanging the de-ethanized bottoms product with the demethanized bottoms product; removing a de-ethanized overhead product from the top of the de-ethanizer and cross exchanging the de-ethanized overhead product with the vapor streams; and, scrubbing the fuel gas stream prior to chilling the stream in the inlet gas cooler.

• Assignee: McDermott International, Inc., New Orleans, LA
• Patent Number(s): US 4695303
• OSTI ID: 5836290
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ALKANES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COMPRESSED GASES
COMPRESSION
COOLING
DEHYDROGENATION
ELEMENTS
ETHANE
FLUID FLOW
FLUIDS
FUEL GAS
FUELS
GAS FLOW
GAS FUELS
GASES
HYDROCARBONS
HYDROGEN
LIQUID FLOW
LIQUIDS
LOW TEMPERATURE
MEDIUM PRESSURE
METHANE
NATURAL GAS LIQUIDS
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PRESSURIZING
RECOVERY
REMOVAL
SCRUBBING
SEPARATION PROCESSES
VAPORS