Application of Dual Membrane Contactor for Simultaneous CO_2 Removal Using Continues Diethanolamine (DEA)

摘要

Technology of membrane contactor is an improvemet of acid gas (CO_2) removal technology that combining gas absorption process with solvent and membrane technology. The objective of the experiment are study the effect of feed gas flow rate and solvent to flux CO_2 and efficiency of CO_2 removal, and also study the performance of membrane contactor. The experiment is conducted by circulating DEA in certain flow rate and arranging hollow fiber membrane in double-crossed section with the amount of desorption membrane three times more than absorption membrane. Feed gas streamed in the tube of membrane absorption and solvent on the shell. At the same time and condition, the process of desorption is done by streamed N_2 gas as the stripping gas in desorption membrane. Performance test is conducted by running optimum variable for 8 hours. The result showed that flux of absorption gain the highest at 24,747xl0~(-4) mol/m~2.s, while flux of desorption gain the highest at 1,761 x 10~(-4) mol/m~2.s. Increasing of absorption flux correspond to increasing of flow rate of feed gas and CO_2 gas concentration but decreasing in flow rate of solvent. Increasing of desorption flux correspond to increasing of flow rate of feed gas and solvent but concentration of CO_2 does not have impact. Efficiency increase while flow rate of mix gas and solvent decreasing, but CO_2 concentration increase. The highest efficiency is 61,64%. Efficiency performance for CO_2 removal of module membrane has the highest value at first 2 hours and stay constant at next running for 8 hours.