Chilled Ammonia Process (CAP)

The Chilled Ammonia Process (CAP) is a proprietary technology being developed by GE. Field validation tests have successfully demonstrated more than 99.9% pure CO2 product quality at 90% capture rates on combustion flue gas originating from oil, gas, and coal fuels.

High CO2 Product Purity

CO2 capture process tolerant to oxygen and flue gas impurities. Stable reagent, no degradation or emission of trace contaminants

Cost effective solution

Globally available reagent and ability to use low ambient conditions to further reduce the energy consumption of the process

Integrated approach from GE, providing both economic and technical benefits

OXY-COMBUSTION CO2 CAPTURE-Chilled Ammonia Process (CAP)

Environmentally benign in terms of emissions, CAP is a chemical absorption process using an ammonium-based aqueous solvent. The flue gas is contacted with chemical solvent—forming ammonium bicarbonate, ammonium carbonate, and ammonium carbamate. The chemical reactions are reversible, and raising the temperature and the pressure of the reaction products reverses the capture reactions, releasing CO2 and allowing the solvent to be regenerated and returned to the process.

CAP technology can be applied to various types of power plants such as coal, gas and biomass, as well as a vast range of industrial processes emitting CO2. The technology uses ammonia for the solvent, which is a globally available, low-cost commodity chemical with excellent thermal and chemical properties


Product Specifications


Parameters  Target (estimated future commercial) Status (today’s offering)
Flue Gas Inlet Conditions
Temperature (°C) 45 – 100 45 – 100
Pressure (bara) 1 1
Flow Rate (t/h) Up to 3,000 Up to 1,150
C02 Vol (% dry basis) 4 – 16 4 – 16
H2O Vol (%) 5 – 10 5 – 10
N2 Vol (% dry basis) 70 70
O2 Vol (% dry basis) 2 – 6 2 – 6
C02 Capture Rate (%) Up to 90 Up to 90
CO2 Product Specification and Conditions
Temperature (°C) As Required As Required
Pressure (bara) As Required As Required
Flow Rate (t/h) Up to 800 10 – 200
C02 (mol-%) Up to 99.9 Up to 99.9
H2O (mol-ppm) As Required As Required