Development of Continuous Series Membrane Electrolysis Technology for NaOH Absorbent Regeneration in the Biogas Purification System at the Acid Gas Removal

Kristanto, Teofilus and Pujiyanto, Tasliya Diba (2018) Development of Continuous Series Membrane Electrolysis Technology for NaOH Absorbent Regeneration in the Biogas Purification System at the Acid Gas Removal. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.


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Biogas, one of the alternative energy being developed, has a high CO2 content in the process, which is 27% - 38%. To meet the standards of biogas for fuel, the presence of CO2 gas should be eliminated until 3-5%. One of the the best Acid Gas Removal method to eliminate CO2 content in biogas is absorption method by contacting biogas with NaOH absorbent in the packed column. However, this method is still constrained on the regeneration of NaOH which requires high energy and operational costs in the process. Therefore, our research aims to develop renewable technology that is membrane electrolysis with continuous series system to regenerate the NaOH absorbent with a lower cost. The experiment was conducted experimentally using 4 electrolysis membrane cell equipped with nafion membrane (C7HF13O5S.C2F4) and plate-shaped stainless steel with thickness of 1 mm as cathode and anode. Chatolyte feed is Aquadest and anolyte feed is the Na2CO3 solution of Acid Gas Removal column that is connected directly with membrane electrolysis. The independent variables are L/G packed column 1/20 dan 1/30, the addition of electrolyte NaOH with concentration of 0.01 M and 1 M, the flow rate of Na2CO3 40, 60, 80, and 100 ml/ min, and the direction of feed co-current and counter current flow. The results of this study indicate that most of charts have volcano form, ie there is a peak point at 80 ml/ minute flow rate for the percent recovery rate of sodium, current density, and mass transfer rates of Na+ of the process. In addition, there were also analysis of factors influencing the NaOH regeneration system to produce an efficient process in order to reduce the cost of biogas production. Optimum results were obtained on variables L/G 1/20, counter current flow, and electrolyte 0.01 M, at 80 ml/ minute flow rate with 95.5% Percent Recovery, 0.2689 kWh energy required, and NaOH production cost of Rp15.573/ kg NaOH, which is below the price of technical NaOH on the market around Rp20.000 – Rp23.400/ kg NaOH.

Keywords: Absorption, Biogas, Membrane Electrolysis, NaOH, Regeneration.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Absorbsi, Biogas, Membrane Electrolysis, NaOH, Regenerasi
Subjects: Q Science > QD Chemistry > QD117 Absorption
Q Science > QD Chemistry > QD553 Electrochemistry. Electrolysis
T Technology > TP Chemical technology > TP255 Electrochemistry, Industrial.
T Technology > TP Chemical technology > TP359 Biogas
Divisions: Faculty of Industrial Technology > Chemical Engineering > 24201-(S1) Undergraduate Thesis
Depositing User: Teofilus Kristanto
Date Deposited: 24 Jun 2021 05:42
Last Modified: 24 Jun 2021 05:42

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