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All Journal Reaktor Jurnal Teknik ITS IPTEK The Journal of Engineering IPTEK Journal of Proceedings Series The Journal of Pure and Applied Chemistry Research Indonesian Journal of Chemistry Walisongo Journal of Chemistry REACTOR : Journal of Research On Chemistry And Engineering Sewagati Bulletin of Chemical Reaction Engineering & Catalysis
Danawati Hari Prajitno
Departemen Teknik Kimia Industri Institut Teknologi Sepuluh Nopember Surabaya
Agriculture, Biological Sciences & Forestry Arts Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Public Health Social Sciences Other

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Pelatihan Peningkatan Kompetensi Guru-Guru SMK Jurusan Keteknik Kimiaan Se-Jawa Timur dalam Bidang Pengolahan Limbah Cair Saidah Altway; Karenina Anisya Pratiwi; Mochammad Zayyan Difa Fadhillah; Daril Ridho Zuchrillah; Soeprijanto; Elly Agustiani; Danawati Hari Prajitno; Agus Surono; Lily Pudjiastuti; Orchidea Rachmaniah
Sewagati Vol 5 No 1 (2021)
Publisher : Pusat Publikasi ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1243.612 KB)

Abstract

Tujuan dari pengabdian masyarakat ini yaitu peningkatan kemampuan Guru Pengajar jurusan Keteknik Kimiaan se-Jawa Timur dalam bidang pengolahan limbah cair untuk mendukung kegiatan belajar-mengajar dalam bidang teknik kimia. Workshop ini dimaksudkan untuk memberi bekal mendasar dengan memberikan pemahaman ilmu dan perhitungan terkait bidang keteknikkimiaan sehingga menjadi acuan saat melakukan praktek dan meningkatkan kemampuan secara praktikal. Hal ini diharapkan dapat mendukung merealisasikan misi SMK jurusan Keteknik Kimiaan di Jawa Timur untuk menghasilkan tenaga kerja yang profesional sesuai dengan tuntutan dunia usaha/industri. Kegiatan peningkatan kemampuan sumber daya guru pengajar teknik kimia di SMK Jawa Timur tidak bisa dilakukan sekaligus atau bahkan hanya beberapa jam atau beberapa hari saja, namun kegiatan tersebut harus diberikan secara mendasar, bertahap dan terencana. Pada tahap ini, sesuai dengan pembicaraan dan kesepakatan dengan pihak mitra yang merupakan pengguna langsung kegiatan ini, peningkatan kemampuan yang diberikan berupa Pendalaman Teori dan Praktek Pengolahan Limbah Cair. Program pelatihan guru-guru jurusan Keteknik Kimiaan dilakukan dalam bentuk Daring sebagai bentuk pengabdian kepada masyarakat yang dilakukan oleh dosen-dosen Departemen Teknik Kimia Industri Fakultas Vokasi –ITS dengan total jam pelatihan adalah 32 jam, mengingat kondisi pandemi Covid-19 saat ini yang tidak memungkinkan untuk mengadakan pelatihan secara tatap muka (offline/Luring).
Pelatihan Peningkatan Kompetensi Guru-Guru SMK Jurusan Keteknik Kimiaan se-Jawa Timur dalam Bidang Unit Operasi Ektraksi Lailatul Qomariyah; Daril Ridho Zuchrillah; Saidah Altway; Danawati Hari Prajitno; Agus Surono; Orchidea Rachmaniah; Irfan Ramadhitya; Ahmad Nezard Dhiaulhaq
Sewagati Vol 7 No 5 (2023)
Publisher : Pusat Publikasi ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j26139960.v7i5.566

Abstract

Guru sebagai tenaga pendidik memiliki kompetensi pedagogi dan profesional dalam menjalankan tugasnya, Guru Sekolah Menengah Kejuruan (SMK) jurusan keteknik kimiaan diharapkan dapat mengembangakn strategi pembelajaran untuk meningkatkan kompetensi profesionalnya. Namun banyak guru SMK jurusan keteknik kimiaan memiliki latar belakang pendidikan keguruan atau sains murni, sehingga kompetensi yang dimiliki belum paripurna. Oleh karena itu, tim pengabdian kepada masyarakat yang terdiri dari dosen Departemen Teknik Kimia Industri dan Teknik Kimia, serta tenaga praktisi dari Industri melaksanakan kegiatan berupa pelatihan peningkatan kompetensi guru-guru SMK jurusan Keteknik Kimiaan se-Jawa Timur bidang unit operasi ekstraksi. Kegiatan pelatihan tersebut telah dilaksanakan secara daring pada tanggal 8 September hingga 24 November 2021 menggunakan aplikasi Zoom. Peserta pelatihan mencapai 120 peserta dengan 35 SMK yang terdaftar. Peserta mengalami kenaikan kompetensi setelah mengikuti pelatihan daring dengan pemateri dari tim dosen Departemen Teknik Kimia Industri dan juga membuat laporan praktikum yang telah disedikan. Metode yang digunakan salah satunya adalah tugas aktualisasi berupa membuat video best practice praktikum ekstraksi sederhana dengan bahan yang ada di sekitar lingkungan sekolah masing-masing, terdapat 24 video yang dapat ditonton di Youtube channel Departemen Teknik Kimia Industri ITS.
Hydrocracking of Non-edible Vegetable Oils with Co-Ni/HZSM-5 Catalyst to Gasoil Containing Aromatics Danawati Hari Prajitno; Achmad Roesyadi; Muhammad Al-Muttaqii; Lenny Marlinda
Bulletin of Chemical Reaction Engineering & Catalysis 2017: BCREC Volume 12 Issue 3 Year 2017 (December 2017)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.12.3.799.318-328

Abstract

Biofuel has been considered as one of the environmentally friendly energy sources to substitute fossil fuel derived from non-edible vegetable oil. This research aims to investigate the effect of the non-edible vegetable oil composition on a specific hydrocarbons distribution contained in biofuel and the aromatics formation through hydrocracking reaction with the Co-Ni/HZSM-5 catalyst. The formation of aromatics from non-edible vegetable oils, such as: Cerbera manghas, rubber seed, and sunan candlenut oils, containing saturated, mono- and polyunsaturated fatty acids is presented. The hydrocracking reaction was carried out in a pressure batch reactor, a reaction temperature of 350 oC for 2 h, reactor pressure of 15 bar after flowing H2 for 1 hour, and a catalyst/oil ratio of 1 g/200 mL. Liquid hydrocarbon product was analyzed by gas chromatography-mass spectrometry. Based on the GC-MS analysis, hydrocracking on three different oils indicated that polyunsaturated fatty acids were required to produce relatively high aromatics content. The sunan candlenut oil can be converted to gasoil range hydrocarbons containing a small amount of aromatic through hydrocracking reaction. Meanwhile, the aromatics in liquid product from hydrocracking of Cerbera manghas and rubber seed oils were not found. 
Zn-Mo/HZSM-5 Catalyst for Gasoil Range Hydrocarbon Production by Catalytic Hydrocracking of Ceiba pentandra oil Yustia Wulandari Mirzayanti; Firman Kurniawansyah; Danawati Hari Prayitno; Achmad Roesyadi
Bulletin of Chemical Reaction Engineering & Catalysis 2018: BCREC Volume 13 Issue 1 Year 2018 (April 2018)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.13.1.1508.136-143

Abstract

Biofuel from vegetable oil becomes one of the most suitable and logical alternatives to replace fossil fuel. The research focused on various metal ratio Zinc/Molybdenum/HZSM-5 (Zn-Mo/HZSM-5) catalyst to produce liquid hydrocarbon via catalytic hydrocracking of Ceiba penandra oil. The catalytic hydrocracking process has been applied in this study to crack Ceiba pentandra oil into a gasoil range hydrocarbon using Zn-Mo/HZSM-5 as a catalyst. The effect of various reaction temperature on the catalytic hydrocracking of Ceiba pentandra oil were studied. The Zn-Mo/HZSM-5 catalyst with metal ratio was prepared by incipient wetness impregnation method. This process used slurry pressure batch reactor with a mechanical stirrer. A series of experiments were carried out in the temperature range from 300-400 oC for 2 h at pressure between 10-15 bar. The conversion and selectivity were estimated. The liquid hydrocarbon product were identified to gasoline, kerosene, and gas oil. The results show that the use of Zn-Mo/HZSM-5 can produce gas oil as the most component in the product. Overall, the highest conversion and selectivity of gas oil range hydrocarbon was obtained when the ZnMo/HZSM-5 metal ratio was Zn(2.86 wt.%)-Mo(5.32 wt.%)/HZSM-5 and the name is Zn-Mo/HZSM-5_102. The highest conversion was obtained at 63.31 % and n-paraffin (gas oil range) selectivity was obtained at 90.75 % at a temperature of 400 oC. Ceiba pentandra oil can be recommended as the source of inedible vegetable oil to produce gasoil as an environmentally friendly transportation fuel. 
Bio-kerosene and Bio-gasoil from Coconut Oils via Hydrocracking Process over Ni-Fe/HZSM-5 Catalyst Muhammad Al-Muttaqii; Firman Kurniawansyah; Danawati Hari Prajitno; Achmad Roesyadi
Bulletin of Chemical Reaction Engineering & Catalysis 2019: BCREC Volume 14 Issue 2 Year 2019 (August 2019)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.14.2.2669.309-319

Abstract

In this study, hydrocracking of coconut oil over Ni-Fe/HZSM-5 catalyst was carried out in a batch reactor under different reaction temperature. Coconut oil is proposed as one of the potential feedstock for biofuel production. The Ni-Fe/HZSM-5 catalyst was prepared by incipient wetness impregnation method. The characterization of Ni-Fe/HZSM-5 catalyst by X-Ray Diffraction (XRD), Scanning Electron Microscopy-Energy Dispersive X-ray (SEM-EDAX), and Brunauer-Emmett-Teller (BET). The chemical composition of biofuel was analyzed by Gas-Chromatography-Mass Spectrometry (GC-MS). The results from the GC-MS analysis showed that the hydrocracking reaction over 10 % (Ni-Fe)/HZSM-5 catalyst at temperature of 375 oC obtained the highest hydrocarbon content (contained 49.4% n-paraffin, 26.93 % isoparaffin, 3.58 % olefin) and the highest yield of bio-gasoil 38.6 % in the biofuel liquid hydrocarbon. Pentadecane (n-C15) and heptadecane (n-C17) were the most abundant hydrocarbon compounds in biofuel liquid hydrocarbon. Decarboxylation and/or decarbonylation was the dominant reaction pathways in this process. Based on the result, the reaction temperature had a significant effect on the distribution of biofuel composition and yield of biofuel from coconut oil.
Cultivation of Low-Potassium Paddy Straw Mushrooms (Volvariella volvacea) on Proline-Based Osmolyte Growing Medium to Enhance Nutritional Variety for Hyperkalemia Patients Anisa Fatma Aulia; Dika Rohman Sholeh; Baktias Fitriani; Danawati Hari Prajitno; Rizal Arifin; Afan Hamzah
IPTEK The Journal of Engineering Vol. 10 No. 3 (2024)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v10i3.a22094

Abstract

The increasing variety of food choices has led to a rise in diet-related diseases, as people often prioritize taste over nutritional content. The high consumption of sodium and potassium-rich foods has contributed to a growing number of kidney disease cases. While many studies have focused on producing low-potassium foods, these often result in suboptimal growth. Mushrooms are a nutrient-rich food source, but their high potassium content makes them unsuitable for kidney disease patients. This study aims to determine the effects of different growing media compositions and osmolyte supplementation on potassium content, yield, and mycelium growth duration in low-potassium mushrooms. The cultivation was conducted using the baglog method, starting with the preparation of a growth medium composed of a combination of sengon wood sawdust, rice bran, and dried kepok banana leaves, which were sterilized before inoculating mushroom spawn and incubated in a kumbung for 35 days. Mycelium length was observed during growth, and potassium content was tested post-harvest. The results showed that proline supplementation had an effectiveness threshold, with 3% proline in composition B yielding the best hyphae development and the highest yield of 296.67 grams with the lowest potassium content. For glycerol treatment, 5% glycerol in composition A produced the highest yield and lowest potassium content, while 1% glycerol in composition B resulted in the longest hyphae growth.
Impact of Rotational Speed and Oxygen Flow Rate on Homogeneity and Fluid Flow Patterns Using a CFD-Based Side Entry Mixer in the Aeration Process Danawati Hari Prajitno; Ardista Izdhihar Kaloka; Hikmal Akbar H; Nuriya Shifa A; Vania Salma Fuadiyah; Happy Riezqya Dzunnurain
IPTEK The Journal of Engineering Vol. 12 No. 1 (2026)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j28075064.v12i1.9680

Abstract

Mixing is an essential operation in many industrial processes to ensure uniform material distribution and enhance mass transfer. A side-entry mixer (SEM) is widely used in large storage tanks because it provides effective circulation with lower installation and maintenance costs than conventional top-entry mixers. This study investigated the effects of impeller rotational speed and oxygen flow rate on the homogeneity and flow patterns of a calcium carbonate (CaCO₃)–water suspension during the aeration process. Computational Fluid Dynamics (CFD) simulations using ANSYS and experimental visualization were employed to evaluate mixing performance. The operating conditions included impeller rotational speeds of 500, 600, 800, 1000, and 1200 rpm and oxygen flow rates of 5, 10, 15, 20, and 25 L/s. The results showed that increasing rotational speed and oxygen flow rate accelerated mixing and improved fluid homogeneity. The flow was dominated by axial and combined axial–radial patterns, promoting uniform circulation throughout the tank. Under the investigated conditions, the best mixing performance was achieved at 1200 rpm with oxygen flow rates of 20 and 25 L/s, reaching complete mixing within 40 s. Higher Reynolds and Sherwood numbers at these conditions also indicated enhanced turbulent mixing and mass transfer.
Impact of Rotational Speed and Impeller Types on Flow Patterns and Mixing Time in a Side-Entry Dual Mixer: A Study Using CFD and Visual Methods Ardista Izdhihar Kaloka; Shendi Haris Firmansyah; Marsyada Maghfirotul Wafiroh; Ni’mah Wati; Icha Nur Prayadi; Danawati Hari Prajitno
IPTEK The Journal of Engineering Vol. 12 No. 1 (2026)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j28075064.v12i1.9682

Abstract

The effectiveness of industrial mixing processes is strongly influenced by impeller type and rotational speed because these parameters determine flow pattern, turbulence intensity, and fluid homogeneity. This study analyzes the effect of impeller type and rotational speed on flow pattern, mixing time, and turbulence characteristics in a side-entry dual mixer using a calcium carbonate (CaCO₃) suspension and water. The analysis was conducted using computational fluid dynamics (CFD) modeling and visual observation to identify circulation patterns and stagnant zones. Three impeller configurations were evaluated: dual four-blade propellers, four-blade pitched blade turbines (4-PBT), and a combination of both, operated at 300 and 600 rpm. The results show that impeller type significantly influences the flow pattern, while increasing rotational speed reduces mixing time. The dual 4-PBT at 600 rpm provided the best performance, characterized by multiple axial–radial circulation loops without stagnant zones and the fastest mixing time of 120 s. This configuration also produced the highest Reynolds number of 3127.19, indicating a transitional flow regime that enhances turbulence and accelerates homogenization. These results demonstrate the importance of selecting appropriate impeller types and rotational speeds to improve industrial mixing efficiency.
Co-Authors Achmad Roesyadi Adi Soeprijanto Afan Hamzah, Afan Agus Budianto Agus Surono Agustiani, Elly Ahmad Nezard Dhiaulhaq Altway, Saidah Anisa Fatma Aulia Ardista Izdhihar Kaloka Baktias Fitriani Dika Rohman Sholeh Eko Supriadi Firman Kurniawansyah Hafshah Hafshah Hafshah Hafshah Happy Riezqya Dzunnurain Hikmal Akbar H Icha Nur Prayadi Ignatius Gunardi Irfan Ramadhitya Karenina Anisya Pratiwi Karenina Anisya Pratiwi Kusno Budhikarjono Lailatul Qomariyah Lenny Marlinda Lily Pudjiastuti, Lily Mahfud Mahfud Mahfud Mahfud Marsyada Maghfirotul Wafiroh Mochammad Zayyan Difa Fadhillah Mochammad Zayyan Difa Fadhillah Muhammad Al Muttaqii Muhammad Al Muttaqii Muhammad Al-Muttaqii Muhammad Al-Muttaqii Muhammad Al-Muttaqii Muhammad Al-Muttaqii Muhammad Iqbal N Nurjannah, N Nurjannah Ngatijo Ngatijo Ni’mah Wati Nuriya Shifa A Nurjannah Nurjannah Nurjannah Nurjannah Rachmaniah, Orchidea Rahmat Basuki Ratna Ediati Rizal Arifin Santi Dyah Savitri Shendi Haris Firmansyah Tillotama Anindita Sari Vania Salma Fuadiyah Victor Purnomo Yustia Wulandari Mirzayanti Zuchrillah, Daril Ridho