GPSA Ch. 16 Ā· Kremser Equation Ā· NGL Recovery
Understand absorption NGL recovery, Kremser equation, tower design, and GPSA methods
The Kremser equation calculates component recovery efficiency based on the absorption factor A = L/(KĆV), where L is liquid rate, K is equilibrium ratio, and V is vapor rate. Target absorption factors of 1.4-2.5 for propane recovery are typical in NGL plants.
Typical operating conditions include absorber pressure of 400-1000 psia, lean oil temperature of 80-100Ā°F, oil-to-gas ratio of 1.5-4.0 gal/Mscf, and 8-15 theoretical stages with 65-80% tray efficiency. Colder lean oil improves absorption performance.
Lean oil absorption typically achieves 70-95% propane (C3) recovery depending on operating conditions and the number of theoretical stages. The process uses a physical solvent (lean oil) to selectively absorb heavier hydrocarbons from the gas stream.
It designs lean oil absorption systems for NGL recovery, calculating oil circulation rates, absorption factors, component recoveries, and reboiler duty using GPSA Kremser equation methods.
The calculator uses the GPSA Kremser equation method to determine absorption factors and component recovery efficiencies.
It provides lean oil circulation rates, absorption factors per component, NGL recovery percentages, and reboiler duty estimates.