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"The study has been conducted to evaluate the effectiveness of the natural solvent from noni fruit for CO2 gas absorption from CH4 through hollow fiber membrane gas-liquid contactors. The solvent was made of 100 grams noni fruit per liter of water. In experiments, the solvent flowed to the shell side of the contactor, while the gas mixture flowed to the lumen fiber. The experimental results showed that mass transfer coefficients in the contactors increased with increasing liquid flow rate and decreasing number of fibers in the contactors. Mass transfer correlation indicated that the mass transfer in the contactor was dominated by turbulent flow. Hydrodynamics analysis of the contactors showed that at the same Reynolds number pressure drops increased with increasing packing density due to an increase in friction between fibers and water. The friction factor ratio data revealed that the fiber surface did not behave like a smooth pipe within the range of velocities in the experiments. Based on QI and Cussler coefficients, chemical absorption occurred during experiments, which might be indicated by the appearance of new compounds in the chemical analysis of the a queous extract from noni fruit after absorption."

"Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) adalah jenis membran penting dalam separasi oksigen dikarenakan tingginya produk oksigen yang dihasilkan. Di dalam percobaan ini deposisi katalis nanopartikel dengan mengunakan kombinasi dari BSCF dan Paladium (Pd) dilakukan pada permukaan BSCF dengan tujuan menstabilkan efek jangka panjang dari katalis. Modifikasi meningkatkan fluks oksigen hingga 300% pada suhu 650 derajat Celcius dibandingkan dengan membran yang tidak dimodifikasi. Katalis BSCF-Pd juga mengakibatkan pengurangan peningkatan pada temperatur diatas 700°C dibandingkan dengan membrane modifikasi katalis komponen tunggal. Penyebab diperkirakan akibat pemuaian partikel BSCF yang menyebabkan berlapisnya partikel Pd yang mengurangi area aktif katalis dan menyebabkan area non aktif pada temperatur tinggi.

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Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) is a prominent membrane material in oxygen separation exhibiting high rate of oxygen permeation. Surface modification using a combination of BSCF and Palladium (Pd) nanoparticles was carried on BSCF hollow fibres for stabilising long term performance enhancement. Modification improved the oxygen permeation flux up to 300% at 650oC compared to unmodified membrane. BSCF-Pd coating had reduced enhancement capabilities at temperatures above 700°C compared to single component coated membranes which hypothesized due to thermal growth of the BSCF particles causing overlapping of the Pd particles, reducing available catalytic surface area and generating non-conducting regions in the membrane at higher temperatures."

"Kontaktor membran serat berongga dapat menutupi kerugian yang terjadi pada metode konvensional. Terdapat dua jenis konfigurasi aliran dari membran kontaktor serat berongga ini. Konfigurasi 1 ketika pelarut dialirkan ke bagian tube and gas di bagian shell, sedangkan konfigurasi 2 sebaliknya. Penelitian ini dilakukan untuk menganalisis efektivitas antara dua konfigurasi tersebut dengan menggunakan larutan Triethanolamine 10% berat sebagai pelarut dan membran PVC. Hasil penelitian ini menyatakan bahwa konfigurasi 1 menghasilkan kinerja yang lebih baik dalam menyerap CO2 dibandingkan dengan konfigurasi 2. Penggunaan Triethanolamine sebagai pelarut menunjukkan kinerja yang kurang optimal, ditunjukkan dengan persentase CO2 yang terserap sekitar 1.98%.

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The hollow fiber membrane contactor overcomes the disadvantages of the conventional method. There are two flow patterns: Case 1 operation where the liquid flows in tube and gas in shell. The case 2 operation where the liquid flows at shell side and gas at tube side. This study is conducted to analyze the effectiveness between both patterns using 10% weight of Triethanolamine as the solvent and PVC membrane. The result of this study: the case 1 provides more effective CO2 absorption performance rather than case 2. The use of triethanolamine shows suboptimal performance, because the maximum CO2 absorbed was 1.98%."