The gas entering an MDEA treating unit contains 0.5 mol% H2S and 8mol% CO2. Inlet flow rate is 120MMscfd (3.22 × 106Nm3/day). The treater uses a 50wt% MDEA solution and has an inlet pressure of...

The gas entering an MDEA treating unit contains 0.5 mol% H2S and 8mol% CO2. Inlet flow rate is 120MMscfd (3.22 × 106Nm3/day). The treater uses a 50wt% MDEA solution and has an inlet pressure of 1,000psig (70barg). The plant then dehydrates the gas and sells it as pipeline-quality gas. The pipeline specification requires that the gas contain no more than 0.25grains/100scf (6mg/Nm3 ) of H2S and a maximum of 2% mol CO2. a. What problem might be encountered in the operation of the Claus unit? b. What alternate methods of gas treating might be suitable for dealing with this problem?