Garuda - Garba Rujukan Digital

p-Index From 2021 - 2026

0.61

P-Index

This Author published in this journals

All Journal Reaktor International Journal of Renewable Energy Development METANA Jurnal Teknik ITS IPTEK Journal of Proceedings Series BERKALA SAINSTEK Jurnal Teknik Kimia Bulletin of Chemical Reaction Engineering & Catalysis Seminar Nasional Teknik Kimia Kejuangan The Journal of Pure and Applied Chemistry Research Journal of Engineering and Technological Sciences Indonesian Journal of Chemistry Communications in Science and Technology Prosiding Seminar Nasional Sains dan Teknologi Terapan Sewagati Bulletin of Chemical Reaction Engineering & Catalysis

Achmad Roesyadi

Chemical Engineering Department, Industrial Technology Faculty, Sepuluh Nopember Institute

Author-ID : 363031

Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Education Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Public Health Social Sciences Other

Published : 43 Documents Claim Missing Document

Claim Missing Document

Articles

1 2 3 4 5

Studi Kinetika Dekomposisi Glukosa pada Temperatur Tinggi Fika Anjana; Widya Rosa Oktaviani; Achmad Roesyadi
Jurnal Teknik ITS Vol 3, No 2 (2014)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Glukosa banyak dimanfaatkan untuk proses dekomposisi dan menghasilkan beberapa senyawa anorganik, dalam penelitian ini salah satu produk yang di hasilkan dalam produksi dekomposisi glukosa adalah HMF (5-hydroxymethyl-2-furaldehyde). Penelitian ini bertujuan untuk mempelajari proses dekomposisi glukosa pada tekanan dan temperature tinggi dimana tekanan dibuat konstan 10 atm dengan bantuan gas nitrogen sedangkan temperature berkisar antara 140-180 °C. Pengaruh konsentrasi asam sulfat dipelajari untuk mengetahui aspek kinetika. Dari penelitian ini didapat dekomposisi glukosa mengikuti orde satu dengan 5-HMF sebagai produk paling banyak sedangkan harga energi aktivasi didapat paling besar 1426.68 J/mol pada komsemtrasi asam sulfat 0.4 N dan konsentrasi HMF paling banyak didapat pada suhu 180, waktu 40 menit sebesar 0.00949 mol/L dengan konsentrasi asam sulfat sebesar 0.4 N.

Konversi Rumput Laut Menjadi Monosakarida Secara Hidrotermal Silvy Eka Andansari; Desty Rusdiana Sari; Achmad Roesyadi
Jurnal Teknik ITS Vol 3, No 2 (2014)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Rumput laut merupakan salah satu sumber devisa negara dan sumber pendapatan bagi masyarakat pesisir dan merupakan salah satu komoditi laut yang sangat populer dalam perdagangan dunia, karena pemanfaatannya yang demikian luas dalam kehidupan sehari-hari, baik sebagai sumber pangan, obat-obatan dan bahan baku industri. Pada proses hidrolisis biasanya menggunakan katalisator asam seperti HCl, asam sulfat. Bahan yang digunakan untuk proses hidrolisis adalah pati. Hidrolisis merupakan reaksi pengikatan gugus hidroksil / OH oleh suatu senyawa. Tujuan penelitian ini antara lain mempelajari proses, pengaruh waktu, suhu, dan konsentrasi katalis terhadap reaksi konversi, serta kinetika reaksi proses hidrolisis rumput laut menjadi monosakarida secara hidrotermal. Dari hasil analisa penelitian yang telah dilakukan, didapatkan analisa gula pereduksi menggunakan metode HPLC dan spektofotometer reagen Nelson-Somogyi. Hidrolisis termal rumput laut dengan katalis asam sulfat dapat menghasilkan gula reduksi. Dari hasil penelitian dan analisa yang telah dilakukan, semakin lama waktu hidrolisis, semakin tinggi suhu, dan semakin besar konsentrasi katalis yang diberikan dapat menghasilkan % gula reduksi yang besar yaitu pada kondisi 80 menit; 240°C; 1N katalis menghasilkan presentase gula reduksi sebesar 0,2848 %. Dengan reaksi yang didapatkan adalah reaksi orde 1, diperoleh energi aktivasi yang lebih kecil pada konsentrasi katalis 1N yaitu sebesar 12.675 J/mol.

Pemanfaatan Biomassa Sebagai Material Katalis untuk Proses Biorefinery Firman Kurniawansyah; Achmad Roesyadi
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2019: PROSIDING SNTKK 2019
Publisher : Seminar Nasional Teknik Kimia Kejuangan

Show Abstract | Download Original | Original Source | Check in Google Scholar

Production of Biofuel by Hydrocracking of Cerbera Manghas Oil Using Co-Ni/HZSM-5 Catalyst : Effect of Reaction Temperature Lenny Marlinda; Muhammad Al Muttaqii; Achmad Roesyadi; Danawati Hari Prajitno
The Journal of Pure and Applied Chemistry Research Vol 5, No 3 (2016)
Publisher : Chemistry Department, The University of Brawijaya

This research aims to investigate the effect of various reaction temperatures on the hydrocracking of Cerbera manghas oil to produce biofuel as a paraffin-rich mixture of hydrocarbons with Co-Ni/HZSM-5 catalyst. Co-Ni/HZSM-5 catalyst was prepared by incipient wetness impregnation. The catalyst was characterized by X-ray diffraction (XRD), N2 physisorption according to the Brunauer-Emmet-Teller (BET) method, and atomic absorption spectrometry (AAS). The hydrocracking reaction was carried out in a pressure batch reactor, reaction temperatures of 300-375 oC for 2 hours, reactor pressure of 15 bar after flowing H2 for at least 1 hour, and a catalyst/oil ratio of 1 g/200 ml. The hydrocarbon composition was determined by gas chromatography-mass spectrometry (GC-MS). With the Co(0.88%)-Ni(3.92%)/HZSM-5 catalyst, the highest yield for gasoil was 46.45% at temperature of 350 oC. At this reaction temperature condition, the main abundant hydrocarbon compounds in gasoil-like hydrocarbon were n-paraffin, i.e. pentadecane of 20.06 area% and heptadecane of 14.13 area%. Biofuels produced showed that abundant hydrocarbon compounds were different at different reaction temperatures. Iso-paraffin with low freezing point and good flow property were not found in gasoil-like hydrocarbon. Isomerization depends on reaction condition and type of catalyst.

Co-Ni/HZSM-5 Catalyst for Hydrocracking of Sunan Candlenut Oil (Reutealis trisperma (Blanco) Airy Shaw) for Production of Biofuel Muhammad Al Muttaqii; Lenny Marlinda; Achmad Roesyadi; Danawati Hari Prajitno
The Journal of Pure and Applied Chemistry Research Vol 6, No 2 (2017): Edition of May-August 2017
Publisher : Chemistry Department, The University of Brawijaya

The production of biofuel by hydrocracking of Sunan candlenut oil as renewable energy can substitute fossil energy. The purpose of this work is to produce biofuel by hydrocracking of Sunan candlenut oil with Co-Ni/HZSM-5 catalyst. The catalyst was prepared by incipient wetness impregnation method. The characterization of catalyst was determined by X-Ray Diffraction (XRD) and nitrogen adsorption-desorption isotherms. The functional groups of the hydrocarbon was determined by Fourier Transform Infrared (FT-IR). The hydrocarbon composition was determined by Gas Chromatography Mass Spectrometry (GC-MS). The results showed that biofuel composition consist of 0.14 area% isoparaffins, 12.29 area% cycloparaffins, 6.87 area% normal paraffins, 4.18 area% olefin, and 10.52 area% aromatics, and oxygenated compounds including 35.03 area% carboxylic acids. It was necessary to be done that the oxygenated compounds in biofuel were eliminated to produce the abundant paraffin hydrocarbons at reaction temperature above 350 oC.

Temperature Effect of Crystalinity in Cellulose Nanocrystal from Oil Palm Empty Fruit Bunch (OPEFB) using Sonication-Hydrothermal Methods Zulnazri Zulnazri; Fika Anjana; Achmad Roesyadi
The Journal of Pure and Applied Chemistry Research Vol 6, No 1 (2017): Edition of January - April 2017
Publisher : Chemistry Department, The University of Brawijaya

Production of cellulose nanocrystals (CNCs) from cellulose of oil palm empty fruit bunches (OPEFB) have been done. The delignification of OPEFB was mixed with 17,5% NaOH and carried out in the three-neck flask with refluxed for 2 hour at 80oC. Further the suspension was bleached with NaOCl 2% for 1 hour at 70oC. Then, to produce CNCs, Cellulose was firstly sonicated for 30 minutes at 40oC. After that cellulose was hydrolized at hydrothermal reactor for 0,1,2,3,4,5, hours at 110 and 120oC respectively. After filtration and washing, CNCs was analyzed by X-Ray Diffraction and the result shows that the grade of the highest CNCs crystalinity at consentration of HCL 2 M at a temperature of 110oC with reaction time of 2 hours is equal to 75.87%. It can be concluded that sonication-hydrothermal can increase the grade of crystalinity of cellulose nanocrystal.

Synthesis and Characterization of Ni/Hydrotalcite and Its Application in Hydrocracking Calophyllum Inophyllum Oil Hafshah Hafshah; Danawati Hari Hari Prajitno; Achmad Roesyadi
The Journal of Pure and Applied Chemistry Research Vol 5, No 3 (2016)
Publisher : Chemistry Department, The University of Brawijaya

This research aims to synthesize hydrotalcite as an alternatives of catalyst support of hydrocracking of vegetable oils. Hydrotalcite can be synthesized in several ways, the most common is coprecipitation method. Hydrotalcite was synthesized using Mg/Al mole ratio of 1: 1, NaOH and Na2CO3 as base solutions. Ni/hydrotalcite catalyst was synthesized by incipicient wetness impregnation method with Ni impregnation of 10% w/w. The characterization of the crystal structure was determined by X-ray diffraction (XRD). The spesific surface area (SBET) was determined by adsorption-desorption of nitrogen, it were obtained 201 m2/g after impregnation and 191 m2/g before impregntion. The test of performance of catalyst was conducted by hydrocracking reaction of Calophyllum inophyllum oil. The liquid products were analyzed by gas chromatography mass spectrometry (GC-MS). Hydrocracking process produced gasoline, kerosene, gas oil with yield of 0.36%, 2.45%, 54.88% respectively, conversion of 96.26% and selectivity of gas oil of 84.39%.

The Power Consumption Performance of an Orbiting Screw Solid-Solid Mixer Semuel Pati Senda; Renanto Renanto; Achmad Roesyadi; Wahono Sumaryono; Yazid Bindar
Journal of Engineering and Technological Sciences Vol. 44 No. 3 (2012)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2012.44.3.6

In this work we have investigated mixing in a modified orbiting screw mixer (MOSM) designed for solid-solid mixing. Mixing was carried out using urea powder and natural zeolite powder (UZ) of three varying particle sizes (50-60, 60-80 and 80 mesh). Power consumption was calculated from the measured torque of orbit and screw, obtained from computerized records. It was found that the mixing process in the modified orbiting screw mixer with air injection required a lower power consumption for each particle-size group when compared to mixing without air injection. With UZ mixing in MOSM with air injection, the lowest E was obtained for the 60-80 mesh particle-size group (4,297 Joule/kg-1),whereas when mixing without air injection, the value was 10,296 J/kg. The best mixing operation in this experiment was achieved at NFr = 1.18x10-3 and in the range of values NReâ‰ˆ 8.77x107 to 2.63x108. Moreover, in this study, we have developed an equation to estimate the power consumption required for mixing and determined its correlation with dimensionless numbers.

Kinetics of Palm Oil Transesterification Using Double Promoted Catalyst CaO/KI/Î³- Al2O3 Nyoman Puspa Asri; Kusno Budikarjono; Suprapto Suprapto; Achmad Roesyadi
Journal of Engineering and Technological Sciences Vol. 47 No. 4 (2015)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2015.47.4.1

Double promoted catalyst (CaO/KI/Î³-Al2O3) was used as the catalyst for transesterification of palm oil into biodiesel. The experiment was carried out in a batch reactor consisting of a three-neck glass flask (500 ml capacity) equipped with a reflux condenser, thermometer and magnetic stirrer. Kinetic study was carried out with methanol under reflux conditions at different temperatures (35-75°C) and different times of reaction (1-7 hours). The effects of temperature and time of the reaction on the conversion of palm oil into biodiesel and reaction rate constants were investigated. The results showed that the conversion and rate constants of reaction increased with the increasing of the reaction temperature. The highest conversion of 97% was obtained at 65°C and 5 hours of reaction time. Meanwhile, the activation energy and the frequency factor were 15.47 kJ/mol and 1.22.102, respectively.

PENGARUH WAKTU DEALUMINASI DAN JENIS SUMBER ZEOLIT ALAM TERHADAP KINERJA H-ZEOLIT UNTUK PROSES DEHIDRASI ETANOL Widayat Widayat; Achmad Roesyadi; Muhammad Rachimoellah
Reaktor Volume 13, Nomor 1, Juni 2010
Publisher : Dept. of Chemical Engineering, Diponegoro University

Katalis H-zeolit telah disintesa dari zeolit alam. Proses pembuatan katalis meliputi tahap proses pelakuan kimia, penyaringan dan pencucian, pengeringan dan proses kalsinasi. Penelitian ini bertujuan mempelajari waktu dan sumber bahan baku terhadap karakteristik katalis yang meliputi perbandingan Si/Al, X ray Diffraction (XRD) dan luas permukaan. Hasil penelitian menunjukkan bahwa perlakuan kimia menyebabkan penurunan kadar CaO, MgO dan Na2O karena melarut dalam asam klorida. Perbandingan Si/Al juga menurun dengan meningkatnya waktu operasi dan nilai Si/Al tertinggi pada waktu perlakuan kimia 7 jam. Hasil analisa XRD dari produk katalis tidak dipengaruhi oleh waktu. Luas permukaan spesifik dan volume total pori bernilai tertinggi pada waktu operasi 10 jam sebesar 184,52 m2/gram dan volume total pori 108,243 x 10-3 cc/gram. Hasil uji katalitik menunjukkan bahwa katalis KZ A dan KZ B dapat digunakan untuk proses dehidrasi etanol, yang ditunjukkan adanya produk DiEtil Eter pada proses dehidrasi. Yield DiEtil Eter terbaik diperoleh untuk katalis zeolit KZ A 10 yaitu sebesar 1,78% dan KZ B 15 sebesar 0,28%.

Co-Authors . Widayat A.A. Ketut Agung Cahyawan W Abdul Aziz Adrianto Prihartantyo Agus Budianto Aini, Afrida Nur Aini, Apsari Puspita Airlangga, Bramantyo Al-Muttaqii, Muhammad Ali Altway Anindita Pramesti Putri Nugroho Aparamarta, Hakun Wirawasista Arief Budiman Aushaf, Faishal Danawati Hari Prajitno Darmawan, Raden Delfimelinda Nurul Riyadi Desty Rusdiana Sari Devi, Fatma Putrinta Devita Dian.L Dini Fathmawati Dwi Fitriyanto Fatma Putrinta Devi Fika Anjana Fika Anjana Firman Kurniawansyah Firman Kurniawansyah H Hadiyanto H M Rachimoellah H Satriadi Hafshah Hafshah Hafshah Hafshah Hari Prajitno, Danawati Himawan TBM Petrus Himawan Tri Bayu Murti Petrus Ignatius Gunardi Izza Aliyatul Muna, Izza Aliyatul Jimmy Jimmy Kurniawansyah, Firman Kurniawansyah, Firman Kusno Budhikarjono Kusno Budikarjono Kusno Budikarjono Kusno Budikarjono Kusno Budikarjono Kusuma, Heri Septya Lailatul Qadariyah Lenny Marlinda M. Renardo Prathama Abidin Mahfud Mahfud Mahfud Mahfud Mahfud Mahfud Mahfud Mahfud Marbun, Maja Pranata Mitsuru Sasaki Motonobu Goto Motonobu Goto Muhammad Al Muttaqii Muhammad Al Muttaqii Muhammad Al-Muttaqii Muhammad Al-Muttaqii Muhammad Al-Muttaqii Muhammad Al-Muttaqii Muhammad Rachimoellah Niar Kurnia Julianti Nurjannah Nurjannah Nurjannah Nurjannah Nurkhamidah, Siti Nyoman Puspa Asri Oktarinda Damayanti Pamungkas, Gagas Rachmaniah, Orchidea Rahmaniah Malik Rahmaniah Malik Rahmi Ratna Ediati Renanto Handogo Ricco Aditya S. W Rismawati Rasyid Riyadi, Delfimelinda Nurul Riza Alviany S. Suprapto Santi Dyah Savitri Semuel Pati Senda Semuel Pati Senda Silvy Eka Andansari Siti Machmudah Siti Machmudah Siti Machmudah Siti Machmudah Siti Zullaikah Sri Rachmania Juliastuti, Sri Rachmania Sumarno . Suprapto Suprapto Tantri Kusuma Wardani Tantular Nurtono W. Wahyudiono Wahono Sumaryono Wahyudiono Wahyudiono Widi Astuti Widi Astuti Widiyastuti Widya Rosa Oktaviani Winardi, Sugeng Yazid Bindar Yazid Bindar Yeni Rahmawati, Yeni Yuanita Gustanti Yustia Wulandari Mirzayanti Zulnazri, Z

Title

Found 43 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 43 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 43 Documents
Search