Studi Kelayakan Proses Regenerasi Naoh Dalam Unit Acid Gas Removal Yang Menggunakan Membrane Electrolysis - Feasibility Study Of Naoh Regeneration In Acid Gas Removal Unit Using Membrane Electrolysis

Romzuddin, Muhammad and Pratama, Alvian (2016) Studi Kelayakan Proses Regenerasi Naoh Dalam Unit Acid Gas Removal Yang Menggunakan Membrane Electrolysis - Feasibility Study Of Naoh Regeneration In Acid Gas Removal Unit Using Membrane Electrolysis. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kebutuhan energi dunia semakin meningkat seiring dengan perkembangan peradaban manusia. Karena sumber energi yang terbatas, pada 2020 diprediksikan bahan bakar fosil akan digantikan sumber energi terbarukan. Salah satu energi terbarukan yang potensial adalah biogas, karena kadar metana yang tinggi. Biogas diproduksi melalui proses fermentasi bahan organik pada lingkungan anaerobik dengan bakteri metanogen. Selanjutnya, biogas harus dimurnikan dari senyawa pengotornya, yaitu CO2 dan H2S melalui unit acid gas removal. Pemurnian ini akan meningkatkan higher heating value biogas sebesar 600 hingga 900 Btu/scf. Pada pemurnian biogas dalam unit acid gas removal, larutan NaOH digunakan sebagai absorban liquid yang mnghasilkan produk samping garam alkali (brine) sebagai limbah. Berikut ini adalah hasil dari studi kelayakan secara teknis maupun ekonomis dalam proses regenerasi NaOH dari garam alkali limbah unit acid gas removal dengan metode membrane electrolysis. Prosedurnya adalah cell anoda diisi dengan larutan brine, sedangkan cell katoda diisi dengan aqua DM (demineralized). Cell katoda dan anoda dipisahkan oleh membran penukar kation. Tegangan yang digunakan adalah 5, 10, 15, dan 20 V, sedangkan konsentrasi larutan KCl yang digunakan 0,01; 0,05; 0,1; dan 0,3 M. Temperatur feed bervariasi pada 30 dan 50oC. Hasilnya adalah persen recovery natrium meningkat seiring dengan tegangan, temperatur feed, dan menurun pada konsentrasi larutan elektrolit KCl. Hasil terbaik dengan persen recovery natrium terbesar adalah 95%, didapatkan pada kondisi operasi 30oC, tegangan 15 V dan konsentrasi larutan KCl 0,01 M. Pada kondisi elektrolisis tersebut, efisiensi energi dapat dihitung sebesar 0,009 M-NaOH/Wh, atau setara dengan Rp4600/kg Naoh. ======================================================================================================================== The world's energy demand is increasing with the development of human civilization. Due to limited energy resource, after 2020 fossil fuels thus is predicted will be replaced by renewable resources. Taking an example, one of the potential renewable energy to be considered is biogas, as its high content of methane, which can be produced via the fermentation process of the organic compounds under controlled anaerobic environment by utilizing the methanogen bacteria. However prior the further use, this biogas must be purified from its impurities contents, i.e. acid gas of CO2 and H2S, up to 4% and 16 ppmv, respectively, in the acid gas removal unit. This such of purification efforts, will significantly increase the higher heating value of biogas, approximately from 600 to 900 Btu/scf. During the purification process in this acid gas removal unit, NaOH solution is used as a liquid absorbant to reduce those acid gases content, in which the by-product of alkali salt (brine) was produced as waste. Here we report the feasibility study of the NaOH regeneration process in acid gas removal unit via membrane electrolysis technology, in which both the technical and economical aspects are taken account. To be precise in procedure, the anode semi-cell was filled with the brine solution, while the cathode semi-cell was filled with demineralized water, and those electrode were separated by the cation exchange membrane. Furthermore the applied potential were varied ranging from 5, 10, 15 and to 20 V, while the concentration of KCl electrolyte solutions were varied ranging from 0,01; 0,05; 0,1; and to 0,03 M. This study was conducted under controlled temperatures of 30 and 50C. Here we found that the % sodium recovery was increased along with the applied potential, temperature, and the decrease in KCl electrolyte concentration. We found that the best results, by means of the highest % sodium recovery, i.e. 95%, was achieved under the experimental condition of temperature at 30C, applied potential at 15 V, and KCl electrolyte concentration at 0,01 M. At such electrolysis condition, the energy efficiency was calculated to be 0,009 M-NaOH/Wh, or was equal to operating cost at $0.04/kg- NaOH. Biogas, Acid Gas Removal, Regenerasi Naoh, Dan Membrane Electrolysis.

Item Type: Thesis (Undergraduate)
Additional Information: RSK 665.776 Rom s
Uncontrolled Keywords: Biogas, Acid Gas Removal, Regenerasi NaOH, dan Membrane Electrolysis, Biogas, Acid gas removal unit, NaOH regeneration, Membrane electrolysis.
Subjects: T Technology > TP Chemical technology > TP359 Biogas
Divisions: Faculty of Industrial Technology > Chemical Engineering
Depositing User: ansi aflacha
Date Deposited: 06 Dec 2019 03:08
Last Modified: 06 Dec 2019 03:08
URI: https://repository.its.ac.id/id/eprint/72242

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