Nitrogen rejection fractionation system for variable nitrogen content natural gas
A process is described for separating nitrogen from a pressurized feed containing natural gas and nitrogen over a wide concentration range of 5 to 85 volume percent nitrogen in a single distillation column. Two side intermediate condensers form pressurized product stream of nitrogen and natural gas. This process comprises: cooling and separating the pressurized feed into separate multiple feeds to the column and distilling the cooled feeds in the distillation column to form a pressurized overhead vapor rich in nitrogen and a pressurized bottoms liquid rich in natural gas hydrocarbons; condensing an overhead vapor of an upper section of the column by heat exchange with a first closed loop refrigerant to provide reflux to the column; and condensing in the upper of two side condensers an intermediate vapor from an intermediate section of the column.
- Assignee:
- Air Products and Chemicals, Inc., Allentown, PA
- Patent Number(s):
- US 4662919
- OSTI ID:
- 6532461
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
030300* -- Natural Gas-- Drilling
Production
& Processing
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION CONTROL
CHEMICAL REACTIONS
CONDENSERS
CONTROL
COOLING
DENITRIFICATION
DISTILLATION
ELEMENTS
ENERGY SOURCES
ENERGY TRANSFER
FLUIDS
FOSSIL FUELS
FRACTIONATION
FUEL GAS
FUELS
GAS FUELS
GASES
HEAT TRANSFER
NATURAL GAS
NITROGEN
NONMETALS
POLLUTION CONTROL
PRESSURIZING
QUANTITY RATIO
REMOVAL
SEPARATION PROCESSES
VAPOR CONDENSATION
VAPOR CONDENSERS