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All Journal Makara Journal of Technology
Muhammad Idrus Alhamid, Muhammad Idrus
Universitas Indonesia
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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High Pressure Adsorption Isotherm of CO2 on Activated Carbon using Volumetric Method Martin, Awaludin; Suryawan, Bambang; Alhamid, Muhammad Idrus; Nasruddin, Nasruddin
Makara Journal of Technology Vol. 14, No. 2
Publisher : UI Scholars Hub

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High Pressure Adsorption Isotherm of CO2 on Activated Carbon using Volumetric Method. Adsorption system is ones of the most effective methods for CO2 separating with other substances that produced from the burning of fossil fuels. In the design for that application, beside of characteristics of porous material (adsorbent) data, CO2 adsorption data on the adsorbent (kinetic and thermodynamic) are also needed. The aim of this research is resulting isothermal adsorption data at pressures up to 3.5 MPa by indirect methods (volumetric method) at isothermal temperature of 300, 308, 318 and 338 K. Adsorbent that used in this research is activated carbon made from East of Kalimantan coals by physical activation method (CO2) which is the surface area of activated carbon is 668 m2/g and pore volume is 0.47 mL/g. Carbon dioxide (CO2) that used in this research is high purity carbon dioxide with a purity of 99.9%. Data from the experiment results then correlated using the Langmuir and Toth equations model. The results showed that the maximum adsorption capacity is 0.314 kg/kg at 300 K and 3384.69 kPa. The results of regression of experiment data using Langmuir and Toth models were 3.4% and 1.7%.
Characteristics of Vacuum Freeze Drying with Utilization of Internal Cooling and Condenser Waste Heat for Sublimation Alhamid, Muhammad Idrus; Yusuf, Nasruddin; Mahlia, Indra Teuku Meurah; Kosasih, Engkos Ahmad; Yulianto, Muhamad; Ricardi, Rio
Makara Journal of Technology Vol. 17, No. 2
Publisher : UI Scholars Hub

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Vacuum freeze drying is an excellent drying method, but it is very energy-intensive because a relatively long drying time is required. This research investigates the utilization of condenser waste heat for sublimation as a way of accelerating the drying rate. In addition, it also investigates the effect of internal cooling combined with vacuum cooling in the pressure reduction process. Jelly fish tentacles were used as the specimen, with different configurations for condenser heat waste and internal cooling valve opening. The results show that heating with condenser heat waste can accelerate the drying rate up to 0.0035 kg/m2.s. In addition, pre-freezing by internal cooling prevents evaporation until the mass of the specimen is 0.47 g and promotes transition of the specimen into the solid phase.
Co-Authors Agus S. Pamitran, Agus S. Awaludin Martin Bambang Suryawan, Bambang Engkos A. Kosasih, Engkos A. Haslinda Mohamed Kamar, Haslinda Mohamed Kasni Sumeru Kosasih, Engkos Ahmad Lemington Lemington, Lemington Mahlia, Indra Teuku Meurah Muhamad Yulianto Nasruddin Nasruddin Nasruddin Yusuf, Nasruddin Nazri Kamsah, Nazri RA. Koestoer Rio Ricardi, Rio Sentot Novianto, Sentot