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All Journal Jurnal Ilmu Dasar Jurnal Teknik Kimia Keluwih: Jurnal Sains dan Teknologi
Puguh Setyopratomo
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Mathematics Mechanical Engineering

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MODEL MATEMATIK PENGERINGAN LAPIS TIPIS WORTEL Setyopratomo, Puguh
Jurnal Teknik Kimia Vol 6, No 2 (2012): Jurnal Teknik Kimia
Publisher : Program Studi Teknik Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/jurnal_tekkim.v6i2.386

Abstract

Drying is one of the most significant method in food preservation. This study was conducted to investigate mathematical models of thin layer drying of carrot slices. The kinetic of thin layer drying of carrot slices was experimentally investigated in a hot air convective dryer. Crank solution for difusion in slab model for drying in thin layer were used to predict the drying profile. Drying characteristic of carrot slices were determined using air at 50 oC , 60 oC, 70 oC and  80 oC at air linier velocity  0.4167 m/s. The result showed that before material deformation was taken place the Crank solution model was suitable for long- periode drying. Key words: carrot, drying, mathematical model
MODEL MATEMATIK PENGERINGAN LAPIS TIPIS WORTEL Setyopratomo, Puguh
Teknik Kimia Vol 1, No 1 (2012): BERKALA ILMIAH TEKNIK KIMIA
Publisher : jurusan teknik kimia

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Abstract

Pengeringan merupakan salah satu metode yang sangat penting dalam pengawetan bahan pangan. Studi ini dimaksudkan untuk menginvestigasi model matematik pengeringan lapis tipis wortel. Kinetika pengeringan lapis tipis wortel diinvestigasi melalui percobaan pengeringan dengan udara panas secara konveksi. Model solusi Crank untuk difusi dalam bahan berbentuk slab dalam pengeringan lapis tipis digunakan untuk memprediksi profil pengeringan. Karakteristik pengeringan wortel ditentukan dengan menggunakan udara pada suhu 50 oC, 60 oC, 70 oC dan 80 oC pada kecepatan 0,4167 m/s. Hasil studi menunjukkan bahwa sebelum terjadinya deformasi bahan model solusi Crank cukup sesuai untuk waktu pengeringan yang cukup lama. Kata kunci: model matematik,  pengeringan, wortel
PRODUKSI ASAM LEMAK DARI MINYAK KELAPA SAWIT DENGAN PROSES HIDROLISIS Setyopratomo, Puguh
Jurnal Teknik Kimia Vol 7, No 1 (2012): Jurnal Teknik Kimia
Publisher : Program Studi Teknik Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/jurnal_tekkim.v7i1.449

Abstract

In this research work fatty acid was produced by hydrolysis of crude palm oil using hydrochloric acid catalyst. The hydrolysis was performed in 1 liter stirred spherical glass reactor. Agitation speed was maintained at 450 rpm, whereas oil bath was used to maintain the reaction mixture temperature. The reaction mixture temperature was varied at 40 oC, 60 oC, and 80 oC, whereas crude palm oil/ water mol ratio was varied at 1:3, 1:6, 1:9, and 1:12. The experiment results showed that the reaction equilibrium had not been achieved yet after the reaction running for 8 hours. The highest conversion was 69.77% which was obtained at reaction temperature 80 oC and crude palm oil/water mol ratio 1:12. The experiment results also showed that the reaction temperature and water excess significantly affecting the reaction conversion. Key words: crude palm oil, fatty acid, hydrolysis, HCL
Effect of Reaction Temperature and the CPO/Metanol Ratio on the Product Characteristics in the Biodiesel Production Using Diethyl Eter as Co-Solvent Puguh Setyopratomo; Edy Purwanto; Rudy Hartanto; J Kristianto
Jurnal ILMU DASAR Vol 9 No 1 (2008)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

In this research Crude Palm Oil (CPO) and methanol were reacted by applying 5 % basic catalyst (KOH) and adding diethyl ether as co-solvent to produce methyl ester (biodiesel). Co-solvent was added in order to form one-phase reaction mixture, and then higher reaction rate was expected compare with two-phase system. Reaction was carried out batch wise in 1 litre glass reactor stirred continuously at 300 rpm. The objective of this research is to obtain the characteristic of biodiesel product. The advantage using this methode was showed by several characteristics of the biodiesel product. The density and viscosity had achieved the commercial biodiesel standard, this biodiesel product has higher flash point of the product compared with solar, which means lower risk factor during storage. The very low sulfur content and the pour point of product that was layed below the maximum allowable limit, are environmentally favorable. 
Process Design of Benzene Nitrification Agustriyanto, Rudy; Sapei, Lanny; Mochni, Endang Srihari; Setyopratomo, Puguh
Keluwih: Jurnal Sains dan Teknologi Vol. 4 No. 1 (2023): Keluwih: Jurnal Sains dan Teknologi (February)
Publisher : Direktorat Penerbitan dan Publikasi Ilmiah, Universitas Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24123/saintek.v4i1.5391

Abstract

Abstract—Aspen HYSYS was used to investigate several aspects of process design for benzene nitration. In this study, the frequency factor (ko) and the activation energy (Ea) for benzene nitration were given from the literature. Calculations of chemical and physical properties were performed automatically on Hysys using the NRTL and UNIQUAC Thermodynamic models. Some aspects of process design were studied, namely: (1) the effect of temperature on the conversion of reactions, (2) the effect of the ratio of sulphuric acid to nitric acid on the synthesis of nitrobenzen in the reactor, and (3) the effect of reactor arrangements ( parallel and series) on reaction conversion. The results showed that the peak of conversion that could be achieved on a single reactor was 96.9% at a ratio of sulfuric acid: nitric acid = 3.5 and a temperature of 50ºC. However, based on this study, it is suggested that the most favorable conditions for nitation of benzene in an isothermal reactor are 50°C and a sulfuric acid:nitric acid ratio of about 2.5 to 3. Abstrak—Aspen HYSYS digunakan untuk menginvestigasi beberapa aspek perancangan proses pada nitrasi benzen. Energi aktivasi (Ea) dan faktor frekwensi (ko) untuk reaksi ini diperoleh dari literature. Perhitungan sifat-sifat fisis dan kimia dilakukan secara otomatis pada Hysys dengan menggunakan model Termodinamik NRTL dan UNIQUAC. Beberapa aspek perancangan proses dipelajari dengan simulasi, yaitu: pengaruh suhu pada konversi reaksi, pengaruh rasio asam sulfat terhadap asam nitrat pada sintesa nitrobenzen dalam CSTR (reaktor berpengaduk kontinyu), dan pengaruh susunan reaktor baik seri maupun parallel terhadap konversi reaksi. Hasil penelitian menunjukkan bahwa konversi tertinggi yang dapat dicapai pada CSTR tunggal adalah 96,9 % pada rasio asam sulfat: asam nitrat = 3,5 dan suhu 50ºC. Namun demikian, berdasarkan penelitian ini, disarankan bahwa kondisi yang paling disukai untuk nitasi benzen dalam CSTR isotermal adalah 50ºC dan rasio asam sulfat:asam nitrat sekitar 2,5 sampai 3.
Simulation of the Hydrodealkylation of Toluene Using Conversion Reactor Agustriyanto, Rudy; Setyopratomo, Puguh; Mochni, Endang Srihari; Purwanto, Edy
Keluwih: Jurnal Sains dan Teknologi Vol. 5 No. 1 (2024): Keluwih: Jurnal Sains dan Teknologi (February) - In Progress
Publisher : Direktorat Penerbitan dan Publikasi Ilmiah, Universitas Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24123/saintek.v5i1.6351

Abstract

Abstract—The hydrodealkylation of toluene is frequently used to produce the more valuable compound benzene. This process is widely employed in the petrochemical industry. Through hydrodealkylation, toluene undergoes a transformation, resulting in the production of valuable chemicals such as benzene and diphenyl. The objective of this study is to present the results obtained from simulating the process of toluene dealkylation using Aspen HYSYS. The feed to the reactor must contain toluene and hydrogen, while the recommended operating conditions are at 500 oC to 650 oC and 20 to 40 atm pressure to achieve 90% conversion. For this purpose, a conversion reactor has been selected as the preferred type. The simulation outcomes are particularly valuable during the initial stages of designing a production facility for benzene. The mass and energy balance calculations can be easily performed using Aspen HYSYS. Future research may focus on investigating different reactor types while considering the kinetics of the reaction. Keywords: aspen HYSYS, hydrodealkylation, simulation, toluene Abstrak—Hidrodealkilasi toluena sering digunakan untuk menghasilkan senyawa yang lebih bernilai yaitu benzene. Proses ini banyak digunakan dalam industri petrokimia. Melalui hidrodealkilasi, toluena mengalami transformasi, menghasilkan bahan kimia berharga seperti benzene dan diphenyl. Tujuan dari penelitian ini adalah untuk menyajikan hasil yang diperoleh dari mensimulasikan proses dealkilasi toluena menggunakan Aspen HYSYS. Umpan ke reaktor harus mengandung toluena dan hidrogen, sedangkan kondisi operasi yang direkomendasikan adalah pada suhu 500 oC hingga 650 oC dan tekanan 20 hingga 40 atm untuk mencapai konversi 90%. Untuk tujuan ini, reaktor konversi telah dipilih sebagai tipe yang disukai. Hasil simulasi sangat berharga selama tahap awal perancangan fasilitas produksi benzene. Perhitungan neraca massa dan energi dapat dengan mudah dilakukan menggunakan Aspen HYSYS. Penelitian masa depan dapat fokus pada penyelidikan berbagai jenis reaktor sambil mempertimbangkan kinetika reaksi. Kata kunci: aspen HYSYS, hidrodealkilasi, simulasi, toluene
Isomerization of Cis-2-Butene to Trans-2-Butene in a Plug Flow Reactor: A Simulation Study Using Aspen HYSYS V14 Rudy Agustriyanto; Endang Srihari Mochni; Edy Purwanto; Puguh Setyopratomo
Keluwih: Jurnal Sains dan Teknologi Vol. 5 No. 2 (2024): Keluwih: Jurnal Sains dan Teknologi (August) - In Progress
Publisher : Direktorat Penerbitan dan Publikasi Ilmiah, Universitas Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24123/saintek.v5i2.6715

Abstract

Abstract—This study investigates the isomerization of cis-2-butene to trans-2-butene in a single-tube Plug Flow Reactor (PFR) using Aspen HYSYS V14 for process simulation. The reaction is modeled as a homogeneous, irreversible isomerization with first-order kinetics (rate constant k=0.003833 s−1). The objective was to determine the optimal reactor volume and channel diameter to achieve 95% conversion of cis-2-butene under specified conditions: 1 meter reactor length, 100 kgmol/h feed rate, 12 bar pressure, and 25°C. The Peng-Robinson fluid package was employed for thermodynamic calculations. Simulation results indicate that a reactor volume of 2.268 m³ and channel diameter of 1.699 m are required to achieve the target conversion. This study demonstrates the efficacy of Aspen HYSYS in reactor design optimization and provides valuable insights for industrial applications of butene isomerization. The methodology presented offers a robust framework for addressing similar chemical engineering challenges. Keywords: aspen HYSYS, butene, isomerization, plug flow reactor, process simulation. Abstrak—Penelitian ini menyelidiki isomerisasi cis-2-butena menjadi trans-2-butena dalam Reaktor Aliran Sumbat (PFR) tabung tunggal dengan menggunakan Aspen HYSYS V14 untuk simulasi proses. Reaksi dimodelkan sebagai isomerisasi homogen irreversible, dengan kinetika orde pertama (konstanta kecepatan reaksi k = 0,003833 s−1). Tujuan penelitian ini adalah menentukan volume reaktor dan diameter saluran yang optimal untuk mencapai konversi cis-2-butena sebesar 95% di bawah kondisi yang telah ditentukan: panjang reaktor 1 meter, laju umpan 100 kgmol/jam, tekanan 12 bar, dan suhu 25°C. Paket fluida Peng-Robinson digunakan untuk perhitungan termodinamika. Hasil simulasi menunjukkan bahwa volume reaktor sebesar 2,268 m³ dan diameter saluran sebesar 1,699 m diperlukan untuk mencapai konversi yang ditargetkan. Penelitian ini menunjukkan efektivitas Aspen HYSYS dalam optimasi desain reaktor dan memberikan wawasan berharga untuk aplikasi industri isomerisasi butena. Metodologi yang dipresentasikan menawarkan kerangka kerja yang kuat untuk mengatasi tantangan rekayasa kimia serupa. Kata kunci: aspen HYSYS, butena, isomerisasi, plug flow reaktor, simulasi proses
Study on the Banana Peel Hydrolysate for Lactic Acid Bacteria Growth Media Akbarningrum Fatmawati; Endang Srihari; Puguh Setyopratomo; Rudy Agustriyanto
Keluwih: Jurnal Sains dan Teknologi Vol. 6 No. 1 (2025): Keluwih: Jurnal Sains dan Teknologi (February) - In Progress
Publisher : Direktorat Penerbitan dan Publikasi Ilmiah, Universitas Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24123/saintek.v6i1.7760

Abstract

Abstract—Banana peel is food waste material that may contain certain beneficial nutrition and be useful for bacterial media production. This experiment aims to determine the effect of several variables which may have influence on the ability of banana peel to support probiotic growth. The thermal treatment used autoclave. In the hydrolysis step for probiotic growth, the variables studied were pH and temperature. The best result of hydrolysis was obtained by the initial steam treatment, followed by hydrolysis process at pH 4.5 and 95oC. The reducing sugar content obtained was 0.96 g/L. In the fermentation process, pure banana peel hydrolysate media was able produces to support Lactobacillus plantarum growth better than mixed media. The pure banana peel hydrolysate media could achieve up to 12.89 log CFU/ml. The amylase activity produced in the pure banana peel hydrolysate media was 8.14 DP. Keywords: banana, probiotic, hydrolysis, growth, amylase Abstrak—Kulit pisang merupakan bahan limbah yang memiliki kandungan nutrisi menguntungkan dan berguna untuk produksi media pertumbuhan bakteri. Penelitian ini bertujuan menentukan pengaruh beberapa variabel yang dapat mempengaruhi kulit pisang untuk mendukung pertumbuhan probiotik. Kulit pisang tersebut diolah melalui hidrolisis enzimatik menggunakan enzim amylase termofilik. Variabel sebelum proses hidrolisis adalah penggunaan pengolahan termal menggunakan uap air dan tanpa pengolahan. Pada langkah hidrolisis, variabel yang dipelajari adalah pH dan suhu. Hasil hidrolisa terbaik adalah dengan penggunaan pengolahan awal dengan uap air diikuti dengan hidrolisis pada pH 4,5 dan suhu 95oC. Kandungan gula pereduksi yang diperoleh sebesar 0,96 g/L. Pada proses fermentasi, media dari hidrolisat kulit pisang murni dapat menghasilkan pertumbuhan Lactobacillus plantarum sampai 12,89 log CFU/mL. Aktivitas amylase yang dihasilkan dari media hidrolisat kulit pisang tersebut adalah 8,14 DP. Keywords: pisang, probiotic, hydrolysis, growth, amylase
Adsorpsi Zat Warna Acid Blue 29 Menggunakan Pristine Multiwalled Carbon Nanotubes Setyopratomo, Puguh; Agustriyanto, Rudy; Yuli Widianto, Aloisiyus; Purwanto, Edy; Srihari, Endang
Keluwih: Jurnal Sains dan Teknologi Vol. 6 No. 2 (2025): Keluwih: Jurnal Sains dan Teknologi (August) - In Progress
Publisher : Direktorat Penerbitan dan Publikasi Ilmiah, Universitas Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24123/saintek.v6i1.7307

Abstract

Abstract—The increasing pollution of dyes in industrial wastewater has recently attracted attention to obtain effective and efficient dye removal techniques. In this study, pristine multiwalled carbon nanotubes were tested for their performance as adsorbents to remove acid blue 29 dye. Multiwalled carbon nanotubes were synthesized by the catalytic chemical vapor deposition method from liquefied petroleum gas with Fe-Co-Mo/MgO catalyst. Adsorption experiments were carried out in batches by varying the initial concentration of dyes. The purpose of this study was to observe the performance of pristine multiwalled carbon nanotubes to adsorb dyes. In addition, observation of the suitability of the adsorption equilibrium model for this system was also carried out. The results showed that pristine multiwalled carbon nanotubes were proven to be able to remove acid blue 29 dye. The experimental results showed that the percentage of dye removal was higher when the initial concentration of dye in the liquid was lower. The pristine carbon nanotubes used were able to reduce dyes from the liquid by 68.8% in just one process cycle. Adsorption equilibrium stu dy showed that Freundlich equilibrium model is more suitable for this system than Langmuir equilibrium model. The results of this study have shown that multiwalled carbon nanotubes have a very good chance as an adsorbent to remove dyes from industrial wastewater. Keywords: adsorption, carbon nanotubes, equilibrium, model, removal Abstrak—Meningkatnya polusi zat warna pada limbah cair industri akhir-akhir ini telah menarik perhatian untuk mendapatkan teknik penghilangan zat warna tersebut yang bekerja secara efektif dan efisien. Pada penelitian ini pristine multiwalled carbon nanotubes diuji kinerjanya sebagai adsorben untuk menghilangkan zat warna acid blue 29. Multiwalled carbon nanotubes disintesa dengan metode catalytic chemical vapor deposition dari liquified petroleum gas dengan katalis Fe-Co-Mo/MgO. Eksperimen adsorpsi dilakukan secara batch dengan memvariasikan konsentrasi awal zat warna. Tujuan penelitian ini adalah untuk menguji kinerja pristine multiwalled carbon nanotubes tersebut untuk mengadsorpsi zat warna. Disamping itu juga dilakukan uji kesesuaian model kesetimbangan adsorpsi untuk sistem ini. Hasil penelitian menunjukkan bahwa pristine multiwalled carbon nanotubes terbukti bisa menghilangkan zat warna acid blue 29. Hasil eksperimen menunjukkan bahwa persen removal zat warna semakin tinggi ketika kosentrasi awal zat warna dalam cairan semakin rendah. Pristine carbon nanotubes yang digunakan mampu menurunkan zat warna dari cairan sebanyak 68,8% dalam satu siklus proses saja. Studi kesetimbagan adsorpsi menunjukan bahwa model kesetimbangan Freundlich lebih sesuai pada sistem ini dibandingkan kesetimbangan model Langmuir. Hasil penelitian ini telah menunjukkan bahwa multiwalled carbon nanotubes memiliki peluang yang sangat bagus sebagai adsorben untuk menghilangkan zat warna dari limbah cair industri. Kata kunci: adsorpsi, carbon nanotubes, kesetimbangan, model, removal
Co-Authors Akbarningrum Fatmawati Edy Purwanto Endang Srihari Endang Srihari Mochni Ida Ayu Putu Sri Widnyani J Kristianto Lanny Sapei Mochni, Endang Srihari Rudy Agustriyanto Rudy Hartanto Srihari, Endang Yuli Widianto, Aloisiyus