Hydrogen sulfide concentrator for acid gas removal systems

Patent · Tue Dec 30 04:00:00 EST 1980

OSTI ID:5918700

Nicholas, D M; Hegarty, W P

Conventional low-pressure techniques - such as expansion and flashing or low-pressure stripping - for separating coabsorbed carbon dioxide from the hydrogen sulfide-rich solvent during gas purification require large, expensive compressors to effect the recycle back to the hydrogen sulfide absorber, which must operate at a pressure substantially above that of a flashing separation vessel. This novel purification process efficiently removes the co-absorbed carbon dioxide by heating the hydrogen sulfide-rich solvent after it leaves the absorber, then passing it to a high-pressure carbon dioxide-stripping column that uses either nitrogen or a portion of the product gas to strip the carbon dioxide from the solvent. The carbon dioxide is recycled to the hydrogen sulfide absorber. The carbon dioxide stripper operates at a pressure not much lower than that of the hydrogen sulfide absorber, thus eliminating the need for bulky, costly compressors.

• Assignee: Air Products and Chemicals, Inc.
• Patent Number(s): US 4242108
• OSTI ID: 5918700
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
030300* -- Natural Gas-- Drilling
Production
& Processing
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
NATURAL GAS
OXIDES
OXYGEN COMPOUNDS
PURIFICATION
REMOVAL
SEPARATION PROCESSES
SULFIDES
SULFUR COMPOUNDS