Penelitian Terbaru :
| Axial Inlet Geometry Effects on the Biomass Burner Performances Prof. Ir. Yazid Bindar, M.Sc., Ph.D, Pasymi ST., MT. |
| [bg_collapse view=”link-inline” color=”#4a4949″ icon=”arrow” expand_text=”Show Abstract” collapse_text=”Solid fuel combustion is always preceded by chemical decomposition process. The performances of decomposition process are greatly affected by geometry and operating conditions. This study is aimed to evaluate influence of axial inlet geometry on the decomposition process performances in a burner. The decomposition process performance was evaluated through fluid dynamics characteristics, such as backflows pattern, mixing intensity and heat transfer rate. The fluid dynamics characteristics were evaluated by standard k-ε turbulent model, using Ansys-Fluent software. From simulation results, it was observed that axial inlet diameter (Dₐᵢ) significantly influenced fluid dynamics characteristics in the burner. Of all axial inlet diameters used, there was vortex from furnace to burner cylinder. This vortex had potential to increase the decomposition performance by keeping the burner temperature high. The structure of vortex was determined by the Dai. The mixing intensity and heat transfer rate, which can also be used as decomposition performance indicator, were also dependent on Dai. The best decomposition performance was generated at Dₐᵢ = 0.1 m or 33% of burner cylinder diameter. Under this condition, vortex penetration reached 82% of the burner cylinder length and turbulent intensity as well as heat transfer rate were relatively high.” ][/bg_collapse] |
| Experimental and Numerical Investigation on Fluid Dynamics Characteristics in a Biomass Cyclone Burner Prof. Ir. Yazid Bindar, M.Sc., Ph.D, Pasymi ST., MT. |
| [bg_collapse view=”link-inline” color=”#4a4949″ icon=”arrow” expand_text=”Show Abstract” collapse_text=”Fluid dynamics characteristic is an important factor to be considered, in burners design. In this study, a combination of experimental and numerical method was used to investigate the effects of tangential inlet thickness and tangential velocity on fluid dynamics characteristic in a cyclone burner. Experimentally, backflow pattern in the burner was observed through paper slices dynamic in a transparent burner. Meanwhile, numerically, fluid dynamics in the burner was simulated by standard k-ε turbulent model, using Ansys-Fluent software. At certain values of Rɪᴀ and Iɪᴛ, experiment results showed indication of backflow formation in the burner. The same backflow phenomenon was also observed in the simulation results. It turned out that, the backflow pattern and position of simulation results were similar to the experiment results, which closely resembled a tornado-tail. The research also indicated that the results of simulated static pressure drop were closely approaching the experiment results, particularly for Iɪᴛ values ≤ 4.3. Mean deviation of static pressure between the simulation and the experiment results, for varied range of Rɪᴀ and Iɪᴛ, was 14.67%. From the results above, it was obvious that backflow pattern and static pressure in cyclone burners were greatly influenced by the thickness and tangential velocity. In addition, the effect of tangential velocity was more dominant compared to the thickness. For Iɪᴛ values ≤ 4.3, standard k-ε turbulent model could predict fluid dynamics in cyclone burners with a satisfying result.” ][/bg_collapse] |
| High selectivity of alkanes production by calcium basic soap thermal decarboxylation Prof. Ir. Yazid Bindar, M.Sc., Ph.D, Pasymi ST., MT. |
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| [bg_collapse view=”link-inline” color=”#4a4949″ icon=”arrow” expand_text=”Show Abstract” collapse_text=”Renewable fuel production from vegetable oil and fat or its fatty acids by direct decarboxylation has been widely reported. An innovative approach to produce drop-in fuel via thermal catalytic decarboxylation of basic soap derived from palm stearin reported in this research. The catalytic effect of the calcium and magnesium metals in the basic soap and its decarboxylation on drop-in fuel yield and product distribution was studied. The catalytic effect was tested in the temperature range up to 370⁰C and atmospheric pressure for 5 hours in a batch reactor. It has been proved that the calcium basic soap decarboxylation, effectively produce the drop-in fuel in carbon ranges C8 – C20, in which more than 78% selectivity toward alkane. Whereas, only 70% selectivity toward alkane has been resulted from the magnesium basic soap decarboxylation.”][/bg_collapse] |
| Increasing hydrogen production through cogasification of biomass and low rank coal Dr. Eng. Jenny Rizkiana, Prof. Dwiwahju Sasongko, Dicka Ar Rachim |
| [bg_collapse view=”link-inline” color=”#4a4949″ icon=”arrow” expand_text=”Show Abstract” collapse_text=”The samples were leached with two kinds of strong acid solution, i.e. HF and HCl. The sample mass and solution volume used in all leaching experiments was 10 g and 250 ml, respectively. Experiments were performed at ambient temperature (25⁰C), medium temperature (47⁰C) and high temperature which were below the boiling points of the mixtures (70⁰C). Experiments using HCl were performed in a 500 ml glass beaker, while experiments using HF were performed in 500 ml Teflon beaker. All experiments were mounted on an electric hotplate with magnetic stirring device. There were three variations of reaction residence time of leaching, i.e. 2, 3 and 4 hours. After leaching, the mixtures were immediately filtered by Büchner funnel (vacuum filtration) for experiments using HCl, and it filtered by Polypropylene funnel for experiments using HF. The filtered cakes were washed with distilled water until the wash water became neutral. Filter cake residues were placed in an oven at 110⁰C overnight to remove water as a final drying step.” ][/bg_collapse] |
| Treatment of Natural Zeolit from Sukabumi and Wonosari for tar cracking catalyst Prof. Dr. Herri Susanto, Joko Waluyo, ST., MT |
| [bg_collapse view=”link-inline” color=”#4a4949″ icon=”arrow” expand_text=”Show Abstract” collapse_text=”Tar accumulation can result in blockage, corrosion, and poisoning of catalyst. One of the methods applicable for tar removal is by using a catalyst that enhances steam reforming reaction. In this study, natural zeolites were modified for the use as tar steam reforming catalyst. Zeolite modification can be performed by conducting ion exchange, acid leaching, alkaline leaching or hydrothermal treatment. In this study, the natural zeolite is modified by ion exchange and acid leaching. Acid leaching are performed with the intention of removing impurities and also possibly increasing the surface area through dealumination. The dealumination process causes increased thermal resistance and decreases the acidity of the zeolite. The addition of nickel is expected to increase the activity of the zeolite as a steam reforming catalyst. The purpose of this study is to determine the effect of acid leaching duration and the presence of nickel on the characteristics of zeolite and its activity.” ][/bg_collapse] |
| Isolation and Immobilization of Lipase from Frangipani Latex for Biohydrocarbon Production Astri Nur Istyami, M.T., Jumadi, Septian Fadillah. |
| [bg_collapse view=”link-inline” color=”#4a4949″ icon=”arrow” expand_text=”Show Abstract” collapse_text=”Free fatty acids is an important intermediate product in oleochemical industry. For decades, production of fatty acids from fats and oils are established commercially at high pressure and high temperature, thus needs huge amount of energy. In consequence, some unwanted side reactions are often occur, such as thermal decomposition, polymerization, hydrogenization, and isomerization. Technology of triglyceride hydrolysis can alternatively be established with lipase enzyme utilization, thus the process is also known as lipolysis. This process is potentially more economic than the conventional one because it feasibly operates in mild operating condition and cause less product deterioration. Due to high production cost of microbial lipase, plant is revealed as an interesting alternative source of lipase.” ][/bg_collapse] |
| Hybrid Coal: Effects of Composition and Co-pyrolysis Retention Time in Low Rank Coal and Biomass Waste Co-Pyrolysis Process on The Product’s Yield Dwiwahju Sasongko, Ir., M.Sc., Ph.D, Dr. Eng. Jenny Rizkiana, Dr. Winny Wulandari, Slamet Handoko ST, Hendi Aviano ST, Muhammad Afif Ridha ST |
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| [bg_collapse view=”link-inline” color=”#4a4949″ icon=”arrow” expand_text=”Show Abstract” collapse_text=”Indonesia is one of biggest coal producer in the world. In 2014, Indonesia’s coal resources and reserves respectively 124.9 and 32.3 billion tons based on the data from Ministry of Energy and Mineral Resources Indonesia. However, around 70% of Indonesia’s coal resources and reserves are low rank coal with calorific value <5100 kcal/gr and has high moisture content (up to 30%) so it is inefficient to burn directly. In addition to inefficient, direct combustion of coal will cause emissions of CO² that is not environmetally friendly. Low rank coal upgrading can be done by co-pyrolysis with biomass waste. Indonesia is estimated to have the potential of biomass waste equivalent to more than 400 million GJ each year from agriculture, plantation, and forestry sectors. The co-pyrolysis process will produce new solid fuels called hybrid coal (Jeong et al., 2015; Lee et al., 2013; Park et al., 2010). The purpose of this research is to study the effect of temperature, composition of the mixture, type of biomass waste used, as well as time of the co-pyrolysis process on hybrid coal yield. In the co-pyrolysis process, coal and biomass will undergo thermal decomposition at torrefaction and pyrolysis regime” ][/bg_collapse] |
| Isolation and Immobilization of Lipase from Frangipani Latex for Biohydrocarbon Production Astri Nur Istyami, M.T., Jumadi, Septian Fadillah |
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| [bg_collapse view=”link-inline” color=”#4a4949″ icon=”arrow” expand_text=”Show Abstract” collapse_text=”Free fatty acids is an important intermediate product in oleochemical industry. For decades, production of fatty acids from fats and oils are established commercially at high pressure and high temperature, thus needs huge amount of energy. In consequence, some unwanted side reactions are often occur, such as thermal decomposition, polymerization, hydrogenization, and isomerization. Technology of triglyceride hydrolysis can alternatively be established with lipase enzyme utilization, thus the process is also known as lipolysis. This process is potentially more economic than the conventional one because it feasibly operates in mild operating condition and cause less product deterioration. Due to high production cost of microbial lipase, plant is revealed as an interesting alternative source of lipase. Preliminary experiments showed that frangipani (Plumeria rubra) latex particulate performs highest lipolytic activity compared to other plant lipase observed, including lipase from castor bean, rice bran, and papaya latex. At optimized condition, lipolysis with 1% frangipani latex particulate achieve 74,54% conversion in 10 hours reaction time. In its crude form, frangipani latex contained heterogenous content of protein per gram, resulting in inconsistency of lipolytic degree. On the other hand, immobilized form of lipase is expected to enable the recycling of enzyme. The focus in this research is immobilization of lipase to enable reusing of plant lipase during lipolysis process and to enhance the consistency of lipolytic degree.” ][/bg_collapse] |
| Treatment of Natural Zeolit from Sukabumi and Wonosari for tar cracking catalyst Prof. Dr. Herri Susanto, Joko Waluyo, ST., MT |
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| [bg_collapse view=”link-inline” color=”#4a4949″ icon=”arrow” expand_text=”Show Abstract” collapse_text=”Tar accumulation can result in blockage, corrosion, and poisoning of catalyst. One of the methods applicable for tar removal is by using a catalyst that enhances steam reforming reaction. In this study, natural zeolites were modified for the use as tar steam reforming catalyst. Zeolite modification can be performed by conducting ion exchange, acid leaching, alkaline leaching or hydrothermal treatment. In this study, the natural zeolite is modified by ion exchange and acid leaching. Acid leaching are performed with the intention of removing impurities and also possibly increasing the surface area through dealumination. The dealumination process causes increased thermal resistance and decreases the acidity of the zeolite. The addition of nickel is expected to increase the activity of the zeolite as a steam reforming catalyst. The purpose of this study is to determine the effect of acid leaching duration and the presence of nickel on the characteristics of zeolite and its activity.” ][/bg_collapse] |
| The synthesis of magnesium soaps from coconut oil as intermediet for biohydrocarbon production Meiti Pratiwi, S.T., M.T. |
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| [bg_collapse view=”link-inline” color=”#4a4949″ icon=”arrow” expand_text=”Show Abstract” collapse_text=”In previous study, heating magnesium basic soaps from palm stearine would decarboxylate them to produce biohydrocarbon. The frequent method to produce metal soaps from triglyceride in laboratory scale is metathesis. This process is less favored because this method would produce large amounts of salt waste and it is hard to develop into bigger scale. This study investigated the process and characterization of magnesium soaps from coconut oil and magnesium hydroxide via direct reaction method at 185⁰C for 3 and 6 hours using Blachford method (1982). Coconut oil (Barco) was used in the experiment with acid value/AV 0,6 mg KOH/g and consisted of caprylic acid (5,92%-mol), capric acid (6,08%), lauric acid (42,39%), myristic acid (20%), palmitic acid (11,41%), stearic acid (3,72%), oleic acid (8,94%), and linoleic acid (1,54%).” ][/bg_collapse] |
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