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All Journal Seminar Nasional Teknik Kimia Kejuangan Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Metal Indonesia ASEAN Journal of Chemical Engineering Jurnal Ilmiah Lingkungan Kebumian Jurnal Teknik Kimia Indonesia

I Made Bendiyasa

Chemical Engineering Department, Faculty Of Engineering, Gadjah Mada University, Jln. Grafika, No.2, Yogyakarta, 55281

Author-ID : 2534124

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering

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Pengambilan ion cadmium (II) dari air limbah simulasi menggunakan fly ash aktif: studi kesetimbangan I Made Bendiyasa; D Setiawan; R. Octaviany
Jurnal Teknik Kimia Indonesia Vol 7, No 2 (2008)
Publisher : ASOSIASI PENDIDIKAN TINGGI TEKNIK KIMIA INDONESIA (APTEKIM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jtki.2008.7.2.6

The experimental study of equilibrium of Cadmium (II) adsorbed with fly ash has been performed. The experimental rig was consisted of a 0.5 L three neck flask, a stirrer, a condenser and a thermometer. The rig was immersed in a water bath that was used to control the experimental temperature. The three neck flask was filled with 0.3 L Cadmium solution of a fixed concentration and then 0.3 g of flay ash was put into the flask. Chemical composition of fly ash are as follows (weight %): SiO2 = 54,23; Al2O3 = 25,38; H2O = 2,5; MgO = 1,O; Ca0 = 4,63; Na20 = 0,32; K20 = 0,60; Mn0 = 0,014; Fe2O3 = 6,01; TiO2 = 0,007; P2O5 = 0,042 and loss of ignition (LOI) is 5,26. Cation exchange capacity is 990 meq/kg fly ash. Each run was conducted for 2 hours, and at the end of each experiment Cadmium (II) was analyzed with Atomic Absorbtion Spectrophotometer (AAS). Variables studied were temperature ranging from 303 to 323 K and initial concentration of Cadmium (II) from 7 to 10 mg Cadmium (II) L-1. Experimental data were evaluated with both Langmuir and Freundlich models. It is found that the experimental data is in a good agreement with Langmuir model. Relationships between K for Langmuir and Freundlich and temperature are, respectively, KLangmuir = 2,841066e(-35401,01/RT) and KFreundlich = 4, 75104e(-34403,20/RT) Keywords: fly ash, Langmuir, Freundlich, Cadmium, equilibrium Abstrak Pengambilan Cd(II) dari air limbah simulasi diteliti dengan menggunakan fly ash sebagai adsorben. Tujuan utama penelitian ini adalah mempelajari kesetimbangan adsorpsi Cd(II) dengan fly ash. Disamping itu juga bertujuan untuk mengetahui kapasitas maksimum adsorpsi fly ash. Setiap percobaan dilakukan dalam suatu reaktor batch yang suhunya dipertahankan tetap. Reaktor yang digunakan adalah labu leher tiga dengan volum 0, 5 L yang dilengkapi dengan pengaduk merkuri, pendingin balik, dan termometer. Fly ash dengan berat 0,3 gram dimasukkan ke dalam reaktor yang telah diisi dengan suatu larutan Cadmium dengan volume 0,3 L dan konsentrasi tertentu. Komposisi kimia fly ash adalah (% berat): %): SiO2 = 54,23; Al2O3 = 25,38; H2O = 2,5; MgO = 1,O; Ca0 = 4,63; Na20 = 0,32; K20 = 0,60; Mn0 = 0,014; Fe2O3 = 6,01; TiO2 = 0,007; P2O5 = 0,042 dan berat hilang = 5,26. Fly ash yang dipakai mempunyai nilai kapasitas pertukaran kation (KPK) yang nilainya sama dengan 990 meq/kg fly ash. Setiap percobaan dilakukan selama dua jam, dan kemudian konsentrasi Cd(II) di dalam larutan dianalisis kadar Cd(II)-nya menggunakan Atomic Absorbtion Spectrophotometer (AAS). Variabel yang dipelajari adalah suhu (T) dan konsentrasi awal (Co) larutan. Kisaran suhu yang diteliti adalah 303 sampai 323 K dan konsentrasi awal (Co) antara 7 sampai 10 mg Cd(11) L-1. Data percobaan dievaluasi dengan model Langmuir dan Freundlich. Hasil penelitian menunjukkan bahwa adsorpsi Cd(II) dengan fly ash lebih sesuai dengan model Langmuir. Hubungan K untuk Langmuir dan Freundlrich dengan suhu berturut adaIah KLangmuir = 2,841066e(-35401,01/RT) and KFreundlich = 4, 75104e(-34403,20/RT)Kata kunci: fly ash, Langmuir, Freundlich, Cadmium, kesetimbangan

Sistem penyimpanan energi panas kontak langsung menggunakan larutan Na2HPO4•12H2O Panut Mulyono; I Made Bendiyasa; Dita Budi Wibawa; Suryo Birowo
Jurnal Teknik Kimia Indonesia Vol 4, No 3 (2005)
Publisher : ASOSIASI PENDIDIKAN TINGGI TEKNIK KIMIA INDONESIA (APTEKIM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jtki.2005.4.3.2

The volumetric coefficient of heat transfer and the energy storage capacity in a direct contact thermal energy storage system using Na2HPO4.12H2O solution as thermal energy storage medium have been investigated. Hot kerosene was used as a heal transfer fluid. The experiments were carried out by bubbling hot kerosene from the bottom of a column containing Na2HPO4.12H2O solution. The column used in this experiment was made from glass of 3 mm in thickness with an inside diameter of 7 cm and a height of 100 cm. The effects of kerosene flow rate and kerosene bubble diameter on the volumetric coefficient of heat transfer and the storing rate of energy were studied. It was found that the volumetric coefficient of heat transfer was strongly affected by the flow rate of the kerosene and that the effect of the kerosene flow rate on the storing rate of energy was relative v high, while that of the effect of the bubble diameter was neglectable.Keywords: Direct Contact, Thermal Energy Storage System, Na2HPO4.12H2O Solution AbstrakPenelitian ini mempelajari sistem penyimpanan energi panas kontak langsung menggunakan larutan Na2HPO4.12H2O sebagai media penyimpan energi. Kerasin panas digunakan sebagai fluida alir sumber energi panas. Masalah yang dipelajari pada penelitian ini adalah nilai koefisien perpindahan panas volumetris dan kapasitas penyimpanan panasnya. Percobaan dilakukan dengan menggelembungkan kerasin panas dari dasar kolom yang berisi larutan Na2HPO4.12H2O. Kolom yang digunakan dibuat dari gelas dengan ketebalan 3 mm, mempunyai diameter dalam 7 cm, dan tinggi kolomnya adalah 100 cm. Parameter yang dipelajari dalam penelitian ini adalah pengaruh kecepatan volumetris kerosin dan pengaruh diameter gelembung kerosin terhadap nilai koefisien perpindahan panas volumetris dan terhadap kecepatan penyimpanan panasnya. Hasil penelitian menunjukkan bahwa nilai koejisien perpindahan panas volumetris sangat dipengaruhi oleh kecepatan volumetris kerosin sehingga kecepatan penyimpanan panasnya juga sangat dipengaruhi oleh kecepatan volumetris kerosin. Pengaruh ukuran diameter gelembung terhadap nilai koefisien perpindahan panas volumetris dan terhadap kecepatan penyimpanan panasnya sangat kecil sehingga dapat diabaikan.Kata Kunci: Sistem Penyimpanan Energi Panas, Kontak Langsung, Larutan Na2HPO4.12H2O

Koefisien perpindahan massa volumetris keseluruhan pada ekstraksi Cu dari larutan CuSO4.5H2O dengan tributyl phosphate-kerosin dalam double-stage mixer-settler Panut Mulyono; I Made Bendiyasa; S Sarto; Tri Mustika; H Heriyanto
Jurnal Teknik Kimia Indonesia Vol 5, No 1 (2006)
Publisher : ASOSIASI PENDIDIKAN TINGGI TEKNIK KIMIA INDONESIA (APTEKIM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jtki.2006.5.1.4

Copper is one of the hazardous materials and is found in some industrial waste waters. Extraction is thought to be an effective removal technique for copper from dilute solution. In this study, copper has been extracted by tributhyl phosphate-kerosene from a dilute aqueous solution with a double-stage mixer-settler extraction column. The extraction column used in this experiment was made of glass. The mixer diameter was equal to the diameter of settler was 13 cm. Both the mixer and settler heights were 8 cm. Drop coalescer was mounted in the middle of mixer and settler separator. The diameter of drop coalescer was 6 cm with the thickness of 1 cm. The hole diameter of drop coalescer was 1 mm. The stirrer used in this experiment was cross flat blade with the diameter and width of the impeller was 6 cm and 8 mm, respectively. The overall volumetric coefficient of mass transfer (Kca) increased by increasing the flow rate of the continuous phase (Lo) at the constants stirring speed (N) and flow rate of the dispersed phase (Ld). The increase of Lc from 4.1634 cm3/second to 17.9436 cm3 /second increased the Kca value from 6.6387x10-5/second to 23.1561x 10-5 /second or 248.8%. The value of Kca was also increase by increasing N at the constant values of Lc and Ld The increase of N from 3.3333 rps to8.3333 rps increased the Kca value from 6.0288x10-5 second to 6.6387x10-5 second or 10.1%.Keywords: Mass Transfer Coefficient, Extraction, Copper, Double-stage Mixer-settler AbstrakTembaga (Cu) merupakan logam berat yang bila terbuang ke lingkungan merupakan zat pencemar yang berbahaya. Ekstraksi dapat digunakan dengan efektif untuk memungut Cu dari limbah cair walaupun dalam konsentrasi yang rendah. Penelitian ini mempelajari perpindahan massa antarfasa pada ekstraksi Cu dari larutan CuSO4.5H2O dengan menggunakan pelarut tributyl phosphate dalam kerasin yang dilakukan dalam kolom ekstraksi double-stage mixer-settler yang disusun vertikal. Kolom ekstraksi mixer-settler dibuat dari gelas dengan diameter mixer dan diameter settler 13 cm. Tinggi mixer 8 cm. Diameter drop coalescer 8 cm, tebal 1 cm, dan diameter lubangnya 1 mm. Pengaduk yang digunakan berbentuk flat blade dengan diameter 6 cm dan lebar blade 8 mm. Koefisien perpindahan massa volumetris keseluruhan (Kca) naik dengan naiknya kecepatan alir fasa kontinyu (Lc) pada kecepatan putaran pengaduk (N) dan kecepatan alir fasa dispersi (Ld) tetap. Kenaikan nilai Lc dari 4,1634 cm3/detik menjadi 17,9436 cm3/detik meningkatkan nilai Kca dari 6,6387x10-5/detik menjadi 23,1561x10-5/detik atau 248,8%. Kca juga naik dengan naiknya N pada Lc dan Ld yang tetap. Kenaikan nilai N dari 3,3333 rps menjadi 8,3333 rps meningkatkan nilai K.adari 6,0288x10-5 detik menjadi 6,6387x10-5 detik atau 10,1%.Kata Kunci: Koefisien Perpindahan Massa, Ekstraksi, Tembaga, Double-stage Mixer-settler

Optimasi Presipitasi Logam Tanah Jarang dari Campuran Konsentrat Logam Tanah Jarang dengan Metode ”Response Surface Methodology” Akbar Yulandra; Iga Trisnawati; I Made Bendiyasa; Wahyu Rachmi pusparini; Himawan Tri Bayu Murti Petrus
Jurnal Metal Indonesia Vol 42, No 1 (2020): Metal Indonesia
Publisher : Balai Besar Logam dan Mesin

Dua sumber LTJ berasal dari mineral seperti monasit dan senotim. Ketersediaan LTJ di kerak bumi relatif sedikit, tersebar dan jarang terjadi dalam bentuk bijih. Dalam penelitian ini bahan baku yang digunakan adalah campuran konsentrat LTJ yang berasal dari PT. Monokem Surya. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh konsentrasi H2C2O4, kecepatan pengadukan dan suhu terhadap kemurnian dan pemungutan LTJ dari campuran konsentrat LTJ. Percobaan dilakukan dalam lima langkah: (1) Fusi alkali, proses dilakukan selama 3 jam pada suhu 450oC, dengan rasio padatan NaOH terhadap campuran konsentrat LTJ sebesar 1:1, untuk memutuskan ikatan fosfat; (2) ) Pelindian fosfat dalam produk fusi alkali menggunakan aquadest pada suhu 80oC; (3) Residu pelindian aquadest dilakukan proses perlindian menggunakan 6 M HCl selama 2 jam untuk melarutkan LTJ pada 90oC; (4) Menghilangkan kotoran seperti uranium dan thorium dengan mengendapkannya menggunakan NH4OH pada pH 1; (5) Presipitasi LTJ dari filtrat yang dihasilkan dari butir (4) menggunakan H2C2O4. Didapatkan hasil LTJ dengan kemurnian 96% dan pemungutan sebesar 95% pada konsentrasi H2C2O4 8,11%, kecepatan putar pengaduk 500 rpm, dan suhu 70oC.Two sources of REEs are from mineral monazite and xenotime. The availability of REEs is relatively abundant in the earth’s crust, typically dispersed, and rarely occur in ores. In this study as raw material was a mixed rare earth concentrate from Monokem Surya Ltd. The purposes of this research were to determine the effect of concentration H2C2O4, stirring speed, and temperature regarding to purity and recovery REEs from the mixed rare earth concentrate. The experiments were conducted in five steps:(1) Alkaline fusion, the process was performed about 3 hours at 450oC, with ratio of NaOH solid to the mixed rare earth concentrate sand was 1:1, in order to break phosphate bonds;(2) Leaching of phosphate in alkaline fusion product using aquadest at 80 oC; (3) Aquadest leaching residue was leached using 6 M HCl for 2 hours to dissolve REEs at 90 oC; (4) Removal of impurities such as uranium and thorium by precipitating them using NH4OH at pH 1; (5) Precipitation of REEs from filtrate produced from point (4) using H2C2O4. The results of REEs with 96% purity and 95% recovery was obtained at concentration H2C2O4 8,11%, stirring speed 500 rpm, and temperature 70oC.

Recovery of Rare Earth Elements and Yitrium from non-Magnetic Coal Fly Ash using Acetic Acid Solution Hotden Manurung; Widya Rosita; I Made Bendiyasa; Agus Prasetya; Ferian Anggara; Widi Astuti; Dagus Resmana Djuanda; Himawan Tri Bayu Murti Petrus
Jurnal Metal Indonesia Vol 42, No 1 (2020): Metal Indonesia
Publisher : Balai Besar Logam dan Mesin

The increasing need of REY has been observed in industries such as catalyst industry, metallurgy, military, health and renewable energy resources. REY such as Ce, Nd, Y, and Eu has a prominent evidence to improve material properties such as high electropositive, good conductivity and renewable energy. Due to this increasing need of REY, exploration of alternative source has been conducted. One of the promising alternative sources is coal fly ash. The conventional method to recover REY from coal fly ash using inorganic acids is harmful to the environment. Thus, the exploration of REY extraction from coal fly ash using organic acid has been proposed in this study. The leaching agent was acetic acid applied for all operating condition. Regarding to the mineralization of REY in the form of siliceous minerals (non-magnetic coal fly ash). Silicate digestion was conducted using sodium hydroxide 8 M with solid-to-liquid of 25% to decompose the siliceous mineral. Further, the REY bound siliceous mineral will change to REY(OH)3. Temperature as one of the operating conditions was varied. The maximum recovery of leaching 20.58 %, 43.53 %, 17.38%, 40.96 %, 18.45 % and 32.74 % were achieved for Ce, Dy, La, Nd, Y and Yb respectively at temperature of 90 0C pH 1.74 and 120 minutes. For some metals, increasing the temperature higher than 70 0C does not provide any significant effect for REY recovery such as La and Ce.

Pelindian Nikel dari Bijih LimonitLow-Grade Pomalaa Menggunakan Pelarut Asam Asetat Himmah Sekar Eka Ayu Agustina; I MAde Bendiyasa; Himawan Tri Bayu Murti Petrus; Fika Rofiek Mufakir; Widi Astuti
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2018: PROSIDING SNTKK 2018
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Pengaruh Suhu dan pH pada Presipitasi Elemen Berharga dari Larutan Leaching Low Grade Nikel Laterit Ore dengan menggunakan Pengendap Kalsium Karbonat Surianti Surianti; Marizka Aviana Permatasari; Arini Nur Utami; I Made Bendiyasa; Indra Perdana; Himawan Tri Bayu Murti Petrus
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2019: PROSIDING SNTKK 2019
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Pengaruh Penambahan Kalsium Karbonat (CaCO3) dan Natrium Hidroksida (NaOH) Terhadap Sifat Mekanik Geopolimer Berbasis Kaolin Hudi Nurwendia, I Made Bendiyasaa, Indra Perdanaa Hudi Nurwendi; I Made Bendiyasa; Indra Perdana
Jurnal Ilmiah Lingkungan Kebumian Vol 3, No 2 (2021): Maret 2021
Publisher : Jurusan Teknik Lingkungan, FTM, Universitas Pembangunan Nasional “Veteran” Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jilk.v3i2.4337

Geopolimer memiliki potensi yang besar dalam pemanfaatannya, tetapi hingga saat ini masih belum bisa dimanfaatkan secara luas. Penyebabnya adalah proses pembuatan yang memerlukan aktivator cair sehingga proses mobilisasinya sulit dilakukan. Dalam studi ini, hasil akhir geopolymer berupa serbuk dan "hanya menambahkan air" atau geopolimer satu bagian dengan menggunakan aktivator padat. Permasalahan lain, geopolymer perlu dilakukan proses curing dengan suhu 40-100C dalam waktu 24-17 jam. Penambahan kalsium karbonat ditujukan untuk meningkatkan sifat mekanik geopolimer yang di-curing pada suhu kamar. Penambahan kalsium karbonat memiliki pengaruh sifat mekanik geopolymer, peningkatan terbesar pada jumlah kalsium karbonat sebanyak 15%, kalsium karbonat meningkatkan kuat tekan hingga14 MPa setelah proses curing pada suhu ruang selama 28 hari. Penambahan konsentrasi aktivator juga meningkatkan sifat mekanik geopolimer.

A Thermodynamic Study of Methane Hydrates Formation In Glass Beads Tintin Mutiara; Budhijanto Budhijanto; I Made Bendiyasa; Imam Prasetyo
ASEAN Journal of Chemical Engineering Vol 16, No 1 (2016)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Natural gas hydrates are non-stoichiometry compounds, in which the molecules of gas are trapped in crystalline cells consisting of water molecules retained by energy of hydrogen bonds. The experiments of Methane hydrate formation are performed at constant temperature in a reactor filled with various sizes of glass beads and water. Methane gas was fed into the reactor at various initial pressures. Equilibrium condition was reached when the system pressure did not change. The experimental results showed that the size of the glass beads gave very small effect on the equilibrium pressure of methane hydrate formation, so the effect could be neglected. In this study, the equation of Langmuir constant was Ci,CH4=(1/RT)exp[A+(B/T)] with the values of A and B for small cages were 6.8465 and 18.0342. The values of A and B for large cages were 7.7598 and 18.0361

CO2 Selective Water Gas Shift Membrane Reactor : Modeling and Simulation Sang Kompiang Wirawan; Derek Creaser; I Made Bendiyasa; Wahyudi Budi Sediawan
ASEAN Journal of Chemical Engineering Vol 12, No 1 (2012)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

The concept of a CO2 selective water gas shift (WGS) membrane reactor has been modeled and simulated by a one-dimensional reactor and transport process in the membrane. The model was used to investigate the effect of temperature, total pressure, membrane thickness and area on the reactor performance. A Silicalite-1 membrane was considered to be integrated with the WGS reactor. The mass transport through the membrane was described by surface diffusion. Air was used as sweep gas on the permeate side of the membrane. The catalytic WGS kinetics were for a commercial Cu/ZnO catalyst for the lower-temperature WGS reaction. The WGS membrane reactor was sized to produce H2 sufficient for the production of 10 kW electrical power from a fuel cell. The modeling and simulation results showed that the WGS membrane reactor with a silicalite-1 membrane was capable of decreasing the CO concentration to about 675 ppm which is 70% less than that achievable at equilibrium conversion, but it would come at the cost of unacceptable H2 loss. Based on a minimum target of H2 loss, the optimum outlet CO concentration achieved by the silicalite-1 membrane reactor was about 1310 ppm, under a range of limited conditions. The modeling study showed that both the WGS reaction rate and the CO2/H2 selective permeation played an important role on the overall reactor performance.

Co-Authors Agus Prasetya Akbar Yulandra Aprodhita Kusumaningtyas, Aprodhita Arini Nur Utami Budhijanto Budhijanto D Setiawan Dagus Resmana Djuanda Derek Creaser Dita Budi Wibawa Ferian Anggara Fika Rofiek Mufakir H Heriyanto Himawan Tri Bayu Murti Petrus Himmah Sekar Eka Ayu Agustina Hotden Manurung Hudi Nurwendi Iga Trisnawati Imam Prasetyo Indra Perdana Indra Perdana Marizka Aviana Permatasari Panut Mulyono R. Octaviany Rahman Sudiyo S Sarto Sang Kompiang Wirawan Sarto Surianti Surianti Suryo Birowo Taufikul Hadi Tintin Mutiara Tri Mustika Wahyu Rachmi pusparini Wahyudi Budi Sediawan Widi Astuti Widi Astuti Widya Rosita Yustina Rusnawati, Yustina

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