TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Process: The contacting of primary product stream with gas-rich liquid stream involves condensing vapor in the primary product stream into liquid, to form portion of gas-rich liquid stream. The vapor is condensed by passing through membrane interface into the gas-rich liquid inlet stream. The removing of portion(s) of vapor from the secondary product stream involves flash vaporizing portion(s) of secondary product stream through the membrane interface of the membrane evaporator. The method further involves providing the secondary product stream to a heat exchanger (20), to heat portion(s) of the gas-rich liquid stream to the desorption unit. The heating of gas-rich liquid involves using steam. Preferred Components: The contacting and condensing processes are conducted in the membrane condenser. The apparatus further consists of a heating unit to provide heat to the desorption unit, an absorption unit for contacting lean liquid absorbent gas stream to produce the gas-rich liquid stream, and a heat exchange arrangement for transferring heat between the vapor-reduced secondary product stream and a portion of the gas-rich stream (21) from the absorption unit. The gas-rich stream from the heat exchange arrangement is in direct or indirect fluid contact with the desorption unit. The semi-permeable membrane of the membrane condenser and/or membrane evaporator is impermeable to gas at the operating temperature and pressure of the respective condenser or evaporator. The membrane is a steam permeable membrane. The vapor permeable membrane of membrane condenser or membrane evaporator is hydrophobic. The membrane interface of the membrane condenser is hydrophobic and separates a gas-rich liquid from a gaseous primary product stream. The membrane interface of the membrane evaporator is hydrophobic and separates a gaseous secondary product steam from a liquid regenerator return stream. The membrane comprises a vapor permeable coating layer. Preferred Conditions: The temperature of the desorption unit is 80-200 degrees C. The pressure in the desorption unit is 0.5-15 bar. The pressure in the gas-rich liquid is greater than the pressure in the gaseous product stream. The pressure in the liquid return stream is greater than the pressure in the gaseous secondary product stream.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The gas-rich liquid and gas-lean liquid comprises a gas absorbent chosen from ammonia, alkanol amine, alkyl amine, amino acid and their salts.