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All Journal Reaktor JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Eksergi: Chemical Engineering Journal KOVALEN: Jurnal Riset Kimia JC-T (Journal Cis-Trans): Jurnal Kimia dan Terapannya FLUIDA Jurnal Teknik Kimia dan Lingkungan Journal of Green Science and Technology Jurnal Bahan Alam Terbarukan
Alfiana Adhitasari
Politeknik Negeri Bandung
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Transportation

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SINTESIS GLISEROL KARBONAT DARI GLISEROL DAN UREA MENGGUNAKAN KATALIS RESIN INDION 225 Na Alfiana Adhitasari; Hary Sulistyo; Agus Prasetya
Reaktor Volume 17 No. 3 September 2017
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (267.344 KB) | DOI: 10.14710/reaktor.17.3.140-144

Abstract

Abstract KINETIC STUDY OF GLYCEROL CARBONATE SYNTHESIS FROM GLYCEROL AND UREA USING INDION 225 Na AS CATALYST. The using of biodiesel as an alternative energy source that is renewable causes the increasing of glycerol as byproduct of biodiesel production. It makes the selling value of glycerol decreases. Glycerol processing is needed to increase the selling value of glycerol in the market. One of the glycerol derivative is glycerol carbonate. Glycerol carbonate is used as adhesives, solvents, inks, surfactants, and lubricants. This research was carried out by reacting glycerol and urea in a batch reactor using Indion 225 Na as catalyst. The purpose of this study was to determine the best conditions of synthesis of glycerol carbonate. The results showed that the obtained optimum conversion of glycerol was 48.43% with ratereaction is 0.1296 hr-1 and the ativation energy is 17.0628 kJ/mol.K with frequency factor is 19.4199 hr-1 in the glycerol:urea ratio of 1:1, the catalyst concentration of 5% and a temperature of 130 0C in 5h of reaction. Kata kunci: glycerol; glycerol carbonate; indion 225 Na; urea   Abstrak Penggunaan biodiesel sebagai alternatif sumber energi yang bersifat renewable mengakibatkan meningkatnya gliserol sebagai hasil samping produksi biodiesel. Peningkatan produksi gliserol berdampak terhadap nilai jual gliserol yang semakin menurun. Pengolahan gliserol perlu dilakukan untuk meningkatkan nilai jual gliserol di pasaran. Salah satu produk turunan gliserol adalah gliserol karbonat. Gliserol karbonat mempunyai kegunaan sebagai perekat, pelarut, tinta, surfaktan, dan pelumas. Penelitian ini dilakukan dengan mereaksikan gliserol dan urea dalam reaktor batch menggunakan katalis resin Indion 225 Na. Tujuan dari penelitian ini adalah untuk mengetahui kondisi terbaik sintesis gliserol karbonat. Hasil penelitian menunjukkan bahwa konversi gliserol terbaik yang didapatkan sebesar 48,43% dengan nilai konstanta kecepatan reaksi sebesar 0,1296 jam-1 dan nilai Ea sebesar 17,0628 kJ/mol.K dengan nilai faktor frekuensi sebesar 19,4199 jam-1pada perbandingan gliserol:urea 1:1, konsentrasi katalis 5% dan suhu 1300C selama 5 jam reaksi. Keywords: Gliserol; Gliserol Karbonat; Indion 225 Na ; Urea   
PROSES HIDROLISA PATI TALAS SENTE (Alocasia macrorrhiza) MENJADI GLUKOSA : STUDI KINETIKA REAKSI Astrinia Aurora Dinarsari; Alfiana Adhitasari
JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Volume 2, Nomor 4, Tahun 2013
Publisher : Jurusan Teknik Kimia, Fakultas Teknik, Universitas Diponegoro,

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (272.186 KB)

Abstract

Starch hydrolysis process is the method used in the conversion of starch to glucose from starch material such as Giant Taro (Alocasia Macrorrhiza) using acid catalyst. In this study starch hydrolysis of Giant Taro using hydrochloric acid catalyst is divided into three stages of continuous process that aims to obtain a good pH and temperature on starch hydrolysis process of Giant Taro and studying the kinetics process of starch hydrolysis of Giant Taro into glucose. The experiments were performed using a fixed variable, namely particle size of starch 20 mesh, the ratio of raw material to water is 1:30 (g starch / ml of water), stirring speed 200 rpm and reaction time 60 minutes.There are two random variables i.e. pH 2, 3, 4, 5 and temperature of reaction 500C, 600C, 700C, 800C, 900C. Results of hydrolysis were analyzed using the DNS method to determine glucose levels. The result showed good pH at pH 4 and temperature at 900C, the reaction rate constant k is 9,139x10-4/min and reaction rate equation of hydrolysis is CA = 0,03740164. e- 0,0009139. t.
Pemanfaatan Bioadsorben Dari Sekam Padi Untuk Mendegradasi Logam Cu Pada Minyak Pelumas Bekas Jusuf Pratama; Arlin Dini Anindya; Yurike Luckita; Nabila Nur Latiefa; Alfiana Adhitasari
Fluida Vol 15 No 1 (2022): FLUIDA
Publisher : Jurusan Teknik Kimia, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v15i1.3611

Abstract

Penggunaan minyak pelumas dalam industri sebagai bahan untuk melindungi mesin dari gesekan dengan komponen lain menghasilkan limbah yang sifatnya mudah terbakar dan meledak apabila salah dalam pengelolaan dan pembuangannya, sehingga dapat membahayakan manusia dan lingkungan. Salah satu upaya untuk mengolah minyak pelumas bekas adalah dengan metode asidifikasi-adsorpsi. Metode asidifikasi atau penambahan asam kuat seperti asam sulfat (H2SO4) digunakan untuk menghilangkan pengotor dan mengembalikan beberapa sifat fisik seperti densitas, viskositas dan warna. kemudian untuk menghilangkan kandung logam Cu digunakan metode adsorpsi menggunakan adsorben dari selulosa yang berasal dari sekam padi. Tujuan dari penelitian ini yaitu mengetahui pengaruh penambahan asam sulfat (H2SO4) pada metode asidifikasi, mengetahui pengaruh komposisi massa sekam padi pada metode adsorbsi, serta membandingkan hasil pengujian minyak pelumas bekas sebelum dan setelah diolah ditinjau dari kadar logam berat yang terkandung, viskositas dan Spesific Garivity (SG). Berdasarkan penelitian yang sudah dilakukan penurunan konsentrasi logam Cu tertinggi terjadi pada asidifikasi H2SO4 sebanyak 5% dari volume sampel dengan variasi selusosa-asetat 1:3. Metode asidifikasi-adsorpsi dengan adsorben alami selulosa-kitosan berhasil dilakukan untuk mengubah beberapa sifat fisik dan kadar logam Cu dari minyak pelumas bekas. The use of lubricating oil in industry as a material to protect the machine from friction with other components produces waste that is flammable and explodes if mismanaged and disposed of, so that it can harm humans and the environment. One of the efforts to process used lubricating oil is by acidification-adsorption method. Acidification methods or the addition of strong acids such as sulfuric acid (H2SO4) are used to remove impurities and restore some of the physical properties such as density, viscosity and color. then to remove cu metal bladder used adsorption method using adsorbens from cellulose derived from rice husks The purpose of this study is to find out the effect of sulfuric acid addition (H2SO4) on acidification methods, find out the effect of rice husk mass composition on adsorbtion methods, and compare the results of testing of used lubricant oil before and after processing in view of the levels of heavy metals contained, viscosity and Spesific Garivity (SG). Based on research that has been done the highest reduction in cu metal concentration occurred in the acidification of H2SO4 as much as 5% of the sample volume with a cellulose-acetate variation of 1:3. The acidification-adsorption method with the natural adsorbent cellulose-chitosan was successfully performed to change some of the physical properties and levels of Cu metal from used lubricating oil.
Pengaruh Konsentrasi Inhibitor dari Eceng Gondok dalam Air Hujan dan Air Kran terhadap Laju Korosi: Effect of Water Hyacinth Inhibitor Concentration in Rain Water and Tap Water Media on Corrosion Rate Emma Hermawati; Yunus Tonapa Sarungu; Bambang Soeswanto; Rispiandi; Alfiana Adhitasari; Sudrajat Harris Abdulloh; Rony Pasonang Sihombing; Retno Indarti
KOVALEN: Jurnal Riset Kimia Vol. 8 No. 2 (2022): August Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2022.v8.i2.15931

Abstract

Organic inhibitors in the corrosion process could be obtained from water hyacinth plant. This plant contained antioxidants such as saponins, which could bind to protective metals from corrosion. The objective of this study was to observe the corrosion rate degradation in rainwater and tap water with saponin content of water hyacinth extract with novelty of using methanol in the maceration process. The sample: methanol ratio used in the maceration process was 1 : 9 (w/v). Steel testing was carried out for 5 days in rainwater and tap water. Based on the test results, the saponin content in the water hyacinth extract could be proven by the stability of the foam produced. The experimental results showed a corrosion rate escalation in tap water samples from 47.7% to 94.5% and samples in rainwater from 11.3% to 52.9% at 75 ppm inhibitor concentration. Based on the research, water hyacinth extract using methanol solvent could be used as a corrosion inhibitor.
Pengaruh Jenis Elektrolit Proses Anodisasi Aluminium Terhadap Efisiensi Proses Dan Sifat Mekanik (Kekerasan) Permukaan Dan Ketebalan Lapisan Oksida Rony pasonang sihombing; Agustinus Ngatin; Salsabila Nisrina Junaedi; Wina Maulida; Emma Hermawati Muhari; Alfiana Adhitasari; Yusmardhany Yusuf
JC-T (Journal Cis-Trans): Jurnal Kimia dan Terapannya Vol 6, No 2 (2022)
Publisher : State University of Malang or Universitas Negeri Malang (UM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (365.943 KB) | DOI: 10.17977/um0260v6i22022p024

Abstract

Aluminium adalah logam untuk  bahan peralatan di industri karena mempunyai sifat-sifat yang unggul seperti kuat, ringan, dan mudah dibentuk, tetapi sifatnya mudah terdeformasi dan mempunyai kekerasan serta ketahanaan aus yang rendah. Untuk memperbaiki sifat fisis dan mekanis aluminium dapat dilakukan melalui proses anodisasi. Tujuan penelitian ini adalah menentukan pengaruh jenis  elektrolit pada proses anodisasi terhadap efisiensi proses dan produk tebal lapisan oksida dan sifat mekanik (kekerasan) permukaan aluminium.  Proses anodisasi aluminium dilakukan bervariasi jenis elektrolit (asam sulfat, asam fosfat, asam oksalat, asam kromat,) dengan konsentrasi 15%. Suhu proses anodisasi dibuat konstan pada 25 ⁰C dengan waktu proses 20 menit, dan tegangan 18 Volt.  Hasil penelitian ditunjukkan bahwa proses anodisasi dalam larutan asam sulfat memiliki efisiensi tertinggi yaitu 51,98% daripada ketiga elektrolit yang lain, dan menghasilkan produk ketebalan lapisan oksida paling tinggi mencapai 13,88 µm dan kekerasan permukaan aluminium 287,9 HV, dalam larutan asam fosfat menghasilkan efisiensi terendah yaitu 0,99%, ketebalan lapisan oksida 0,28 µm dan kekerasan permukaan logam aluminium 41,3 HV yang nilainya lebih rendah dari kekerasan permukaan logam dasar yaitu 66,75 HV.
Pemanfaatan Bioadsorben Dari Sekam Padi Untuk Mendegradasi Logam Cu Pada Minyak Pelumas Bekas Jusuf Pratama; Arlin Dini Anindya; Yurike Luckita; Nabila Nur Latiefa; Alfiana Adhitasari
Fluida Vol 15 No 1 (2022): FLUIDA
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v15i1.3611

Abstract

Penggunaan minyak pelumas dalam industri sebagai bahan untuk melindungi mesin dari gesekan dengan komponen lain menghasilkan limbah yang sifatnya mudah terbakar dan meledak apabila salah dalam pengelolaan dan pembuangannya, sehingga dapat membahayakan manusia dan lingkungan. Salah satu upaya untuk mengolah minyak pelumas bekas adalah dengan metode asidifikasi-adsorpsi. Metode asidifikasi atau penambahan asam kuat seperti asam sulfat (H2SO4) digunakan untuk menghilangkan pengotor dan mengembalikan beberapa sifat fisik seperti densitas, viskositas dan warna. kemudian untuk menghilangkan kandung logam Cu digunakan metode adsorpsi menggunakan adsorben dari selulosa yang berasal dari sekam padi. Tujuan dari penelitian ini yaitu mengetahui pengaruh penambahan asam sulfat (H2SO4) pada metode asidifikasi, mengetahui pengaruh komposisi massa sekam padi pada metode adsorbsi, serta membandingkan hasil pengujian minyak pelumas bekas sebelum dan setelah diolah ditinjau dari kadar logam berat yang terkandung, viskositas dan Spesific Garivity (SG). Berdasarkan penelitian yang sudah dilakukan penurunan konsentrasi logam Cu tertinggi terjadi pada asidifikasi H2SO4 sebanyak 5% dari volume sampel dengan variasi selusosa-asetat 1:3. Metode asidifikasi-adsorpsi dengan adsorben alami selulosa-kitosan berhasil dilakukan untuk mengubah beberapa sifat fisik dan kadar logam Cu dari minyak pelumas bekas. The use of lubricating oil in industry as a material to protect the machine from friction with other components produces waste that is flammable and explodes if mismanaged and disposed of, so that it can harm humans and the environment. One of the efforts to process used lubricating oil is by acidification-adsorption method. Acidification methods or the addition of strong acids such as sulfuric acid (H2SO4) are used to remove impurities and restore some of the physical properties such as density, viscosity and color. then to remove cu metal bladder used adsorption method using adsorbens from cellulose derived from rice husks The purpose of this study is to find out the effect of sulfuric acid addition (H2SO4) on acidification methods, find out the effect of rice husk mass composition on adsorbtion methods, and compare the results of testing of used lubricant oil before and after processing in view of the levels of heavy metals contained, viscosity and Spesific Garivity (SG). Based on research that has been done the highest reduction in cu metal concentration occurred in the acidification of H2SO4 as much as 5% of the sample volume with a cellulose-acetate variation of 1:3. The acidification-adsorption method with the natural adsorbent cellulose-chitosan was successfully performed to change some of the physical properties and levels of Cu metal from used lubricating oil.
Pemodelan Kesetimbangan Massa pada Keadaan Tunak (Steady) sebagai Penentuan Konsentrasi Optimum Tawas (Alumunium Sulfate) pada Proses Penurunan Kadar Fe pada Sumber Air Tercemar Alfiana Adhitasari; Eko Andrijanto
Jurnal Teknik Kimia dan Lingkungan Vol. 4 No. 2 (2020): October 2020
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1182.761 KB) | DOI: 10.33795/jtkl.v4i2.136

Abstract

Air tanah merupakan andalan sumber mata air bagi masyarakat pada umumnya, beberapa sumber air tanah sering dijumpai air yang masih terkandung Fe, hal tersebut berdampak buruk bagi kesehatan oleh karena itu perlu dilakukan penuruan kadar Fe pada air sebelum digunakan. Beberapa metode yang umum dilakukan untuk menghilangkan kandungan Fe pada air adalah dengan cara koagulasi oleh tawas. Penelitian ini akan memodelkan sebuah persamaan matematika yang dapat mengkuantifikasi penurunan kadar Fe pada setiap fungsi kosentrasi tawas yang ditambahkan. Model matematika pada penelitian menggunakan penurunan rumus dari kesetimbangan masa. Dari hasil perbandingan data percobaan dengan data perhitungan didapat konstanta penurunan Fe (kF) pada fungsi konsentrasi tawas sebesar 1.8/mg tawas dan nilai konstanta R2 sebesar 0.935, dari data tersebut maka model matematika yang dibuat dapat mewakili fenomena proses penurunan Fe di lapangan. In general groundwater is relied as source water but somtimes we found precense of Fe in some of groundwater products that could harm our health due to its toxicity, therefore it is necessary to reduce Fe content as pretreatment process. Some common methods to reduce Fe content in water are coagulation by alum. This study will build a mathematical equation to quantify the reduction of Fe content in function of alum concentration. In this study the equations were derive from mass balance equation. By comparing the experimental data with calculated data, we obtained kF (The constant of consuming Fe) = 1.8 / mg alum and for R2 constant we obtained 0.935, from these result we conclude our derived equation can represent the phenomenon of alum-Fe reduction phenomena in the field.
Determination Of Optimum Drying Condition On Flavonoid Content Of Ficus Carica L. Leaves Using Tray Dryer Emma Hermawati; Yusmardhany Yusuf; Alfiana Adhitasari
Fluida Vol 16 No 1 (2023): FLUIDA
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v16i1.4401

Abstract

This research aims to find out the characteristics of Ficus carica L. drying process using a tray dryer and determine the effect of temperature and drying time on Ficus Carica L. flavonoid content using a tray dryer to obtain Ficus carica L. herbal leaf tea which is high in antioxidants. At the experimental stage, the water content of fresh leaves of Ficus carica L. were determined, so the water content is 74 ± 1.11% (wet base), then dried using a tray dryer at 35; 40; 45; 50; and 55oC, with a variation of the drying air flow rate of 1.3; 1.6; 1.9; 2.2; and 2.4 m/s. The optimum temperature and drying air flow rate are 50oC and 1.9 m/s since the highest flavonoid content was obtained at those condition as much 0.78 ± 0.001 gram QE/100gram extract. Dried products which packaged in tea bags have a content of 23.60% carbohydrate, total fat 3.50%, protein 5.35%,antioxidant 154.25 ppm and calorific value of 1430 Kcal/100 grams. It can be concluded that Ficus carica L. drying process using a tray dryer can be used to produce herbal leaf tea which is high in antioxidants and flavonoid content.
Laju Korosi Logam Baja Karbon Rendah di Larutan Garam pada Berbagai Konsentrasi Inhibitor Korosi dari Ekstrak Daun Pepaya: Low Carbon Steel Metal Corrosion Rate in Salt Solution at Various Concentrations of Corrosion Inhibitor from Papaya Leaf Extract Ninik Lintang Edi Wahyuni; Rony Pasonang Sihombing; Nurcahyo; Agustinus Ngatin; Yunus Tonapa Sarungu; Alfiana Adhitasari; Bambang Soeswanto; Emma Hermawati Muhari; retno indarti
KOVALEN: Jurnal Riset Kimia Vol. 9 No. 2 (2023): August Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2023.v9.i2.16344

Abstract

Papaya leaf extract could be used as an organic corrosion inhibitor. Corrosion inhibitors were used as a method to reduce corrosion rate. The most corrosive environment was the marine environment. The purpose of this study was to determine the best concentration of papaya (Carica papaya) leaf extract inhibitor which could reduce the corrosion rate of low carbon steel in a 3.56% NaCl solution environment. The maceration process was carried out for 24 hours with 70% ethanol solvent with a solute:solvent ratio of 1:8 (w/v) at room temperature. Inhibitor extracts were analyzed qualitatively with the phytochemical method. The addition of FeCl3 was carried out on the inhibitor extract from papaya leaves. The color change occurred from blackish brown to greenish black which indicated the presence of tannin compounds in the papaya leaf extract. Corrosion testing was carried out with hot stream temperature setting at 45⁰C to 55⁰C and concentrations of inhibitor extracts at 300, 600, and 900 ppm. The test was conducted for 36 hours with a span of metal mass every 6 hours. Corrosion rate calculation is done by weight loss method. The results showed that papaya leaf extract inhibitors positive contained corrosion inhibitor and could reduce the corrosion rate in 3.56% NaCl solution. The corrosion rate without inhibitor is 1.023 mmpy. Corrosion rates with inhibitor concentrations of 300, 600, and 900 ppm were 0.755, 0.585, and 0.438 mmpy, respectively.
Signifikansi Kadar Kafein pada Kopi Kerinci Robusta dalam Berbagai Interval Waktu Soeswanto, Bambang; Yusuf, Yusmardhany; Sihombing, Rony Pasonang; Suryadi, Joko; Luviana, Angely; Asyari, Restu Adji Alif; Adhitasari, Alfiana
Eksergi Vol 20, No 3 (2023)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v20i3.10353

Abstract

Kopi Kerinci Robusta merupakan salah satu kopi yang digemari masyarakat Indonesia yang tumbuh di daerah Kerinci. Selama ini masyarakat hanya mengenal kopi ini untuk dinikmati saja, tanpa memperhitungkan jumlah kandungan kafein yang akan terkonsumsi. Penelitian ini bertujuan untuk mengetahui rasio terbaik pada ekstraksi kopi Kerinci Robusta menggunakan pelarut etil asetat. Rasio umpan: pelarut (b/v) yang digunakan adalah 1:5; 1:7.5; 1:10; 1:12.5. Pelarut yang digunakan dalam penelitian ini adalah etil asetat. Metode penelitian yang digunakan adalah metode ekstraksi dengan kondisi operasi 50⁰C selama 2 jam dengan interval pengambilan sampel setiap 20 menit. Kadar kafein hasil penelitian diukur dengan menggunakan spektrofotometri pada panjang gelombang 273 nm. Hasil penelitian menunjukkan bahwa rasio optimum adalah rasio 1:5 yang menghasilkan kadar kafein sebesar 3737.41 ppm.
Co-Authors Agus Prasetya Andrijanto, Eko Arlin Dini Anindya Astrinia Aurora Dinarsari Asyari, Restu Adji Alif Augustina, Nadya Bambang Soeswanto Bambang Soeswanto Clarisa, Shintiya Fadhillah, Fauzan Fatah, Khalaida Fania Gunawan, Sinna Chaerunnabila Hary Sulistyo Jahulan, Tufana Muhallik Jusuf Pratama Kurnia, Dianty Rosirda Dewi Luviana, Angely Manfaati, Rintis Maryani, Anisya Sri Muhari, Emma Hermawati Muhari, Emma Hermawati Muhari Nabila Nur Latiefa Ngatin, Agustinus Ninik Lintang Edi Wahyuni Nurcahyo Paramitha, Tifa Puspita, Nina Putri, Alifhah Ananda Retno Indarti Rintis Manfaati Rispiandi Rispiandi Rizky, Alfiani Salsabila Nisrina Junaedi Setiawan, Kiranna Shalmadevy Sihombing, Rony Sihombing, Rony Pasonang Silalahi, Rafael Leonardo Sudrajat Harris Abdulloh Suryadi, Joko Unung Leoanggraini Wina Maulida Yulistiani, Fitria Yunus Tonapa Sarungu Yurike Luckita Yusmardhany Yusuf Yusmardhany Yusuf Yusmardhany Yusuf Yusuf, Yusmardhany Zahwa, Keisya Adellia