Taking 100 mol/h of the gas fed to the absorber, calculate the molar feed rate (in mol/hr) of the gas to the absorber required to produce an absorber product gas flow rate of 1000 kg/h.
In an absorption tower (or absorber), a gas is contacted with a liquid such that one or more components in the gas is transferred in the liquid. A stripping tower (stripper) also involves a gas contacting a liquid but components are transferred from the liquid into the gas. A process consisting of an absorber and a stripper is used to separate the components of a gas containing 30.0 mole% CO2 and the balance CH4. This gas is fed to the absorber. A liquid containing 0.500 mole% CO2 and the balanced methanol is recycled from the stripper and also fed to the absorber. The effluent gas leaving the absorber contains 1.00 mole% CO2 and all the CH4 in the feed gas. The effluent solvent leaving the absorber is fed to the stripper (the same stripper that supplies the recycled CO2-methanol liquid mixture) together with a stream of nitrogen gas. Ninety-five percent of the CO2 in this effluent solvent is removed in the stripper and the nitrogen/CO2 stream leaving the stripper passes out to the atmosphere. Methanol may be assumed to be non-volatile and nitrogen may be assumed insoluble in methanol. Taking 100 mol/h of the gas fed to the absorber, calculate the molar feed rate (in mol/hr) of the gas to the absorber required to produce an absorber product gas flow rate of 1000 kg/h.
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