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All Journal Jurnal IPTEK Jurnal Kimia Riset Journal of Research and Technology Jurnal Chemurgy Jurnal Teknik Kimia dan Lingkungan Journal of Science and Social Development

Yulia Tri Rahkadima

Universitas Nahdlatul Ulama Sidoarjo

Author-ID : 757463

Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering

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PENGARUH MICROWAVE HEATING TERHADAP KUALITAS MINYAK DEDAK PADI Rahkadima, Yulia Tri; Fitri, Medya Ayunda
Journal of Research and Technology Vol 4, No 2 (2018)
Publisher : Universitas Nahdlatul Ulama Sidoarjo

Rice bran oil as an alternative edible oil is promising to be developed. However, the presence of lipaze enzym which hydrolyze actively trigliceride into free fatty acid results rice bran quality can not be controlled and tend to degrade. Stabilization proccess was needed to overcome this isue. Stabilization with microwave heating has been carried out to study the effect of stabilization toward the quality of rice bran oil. The results showed that the highest percentage of oil mass 7.67% was obtained at medium power (power 2), stabilization time 1 minute and the extraction waiting time for 0 week. Meanwhile, the levels of free fatty acids tended to be constant when the proccess was carried out at power 3 (high power) for all stabilization times. Microwave heating was effective enough to reduce the lipase enzyme in rice bran so as free fatty acid content did not increase significantly.

TRANSESTERIFIKASI MINYAK DEDAK PADI SECARA IN-SITU DENGAN BANTUAN GELOMBANG MIKRO Rahkadima, Yulia Tri; A’yuni, Qurrota
Journal of Research and Technology Vol 3, No 2 (2017)
Publisher : Universitas Nahdlatul Ulama Sidoarjo

Rice bran as rice milling waste is very promising to be used as raw material of oil producer such as biodiesel oil. The production process with the assistant of microwaves has been studied in this research. The production process was carried out in-situ where the extraction process of rice bran oil and the biodiesel formation reaction occur simultaneously in microwave radiation. Rice bran was obtained from Lamongan area with IR 64 type. The reaction was carried out in microwaves that had been modified by variation of operating conditions including reaction times (10, 30 and 50 min) and weight ratio of rice bran to methanol (1:4, 1:8, 1:12, 1:16 and 1:20). The results obtained are then analyzed by product yield and free fatty acid content. The optimum condition is obtained when the highest yield of the product with the lowest free fatty acid. The results showed that the optimum condition was obtained at reaction time of 30 minutes with the ratio of rice bran: methanol at 1:12.

PRODUKSI BIODIESEL DARI MINYAK JELANTAH MENGGUNAKAN KATALIS KALSIUM OKSIDA Rahkadima, Yulia Tri; Abdi, Putri
Journal of Research and Technology Vol 2, No 1 (2016)
Publisher : Universitas Nahdlatul Ulama Sidoarjo

The transesterification reaction has performed to convert waste cooking oils into biodiesel with assistant of heterogen catalyst of calcium oxide using reactor in a laboratory . The reaction was performed in two stages that is the esterification followed transesterification reaction. The aim of research is to study the effect of temperature and time reaction on viscosity and biodiesel yield. The results showed that obtained biodiesel had viscosity value in accordance with SNI 04-7182-2006 about diesel-fuel viscosity. At lower temperature (40, 45, and 50°C), the longer reaction time could lead to the increasing of biodiesel yield. Meanwhile, at higher temperature reaction (55°C and 60°C) the longer reaction time could reduce biodiesel yield. The highest biodiesel yield was obtained at following reaction condition: temperature reaction 50°C, 6 hours reaction time, ratio oil:MeOH = 1:48 molar ratio, % wt CaO = 8% to weight of waste cooking oil.

The effect of pretreatment process on lignocellulosic materials with a combination of microwaves and alkaline solvents on solid products. Medya Ayunda Fitri; Yulia Tri Rahkadima
Jurnal IPTEK Vol 25, No 2 (2021)
Publisher : LPPM Institut Teknologi Adhi Tama Surabaya (ITATS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.iptek.2021.v25i2.2355

The pretreatment process is important in treating lignocellulosic-rich biomass such as sugarcane bagasse. The lignocellulosic structure is strong, and the proportion of crystals is high, complicating the fermentation process. Still, it needs to be converted to a more amorphous structure for easy access to fermenting enzymes. The pretreatment process is carried out with alkaline solvents and microwaves in this study. The process begins by standardizing the size of the bagasse powder used. Sugarcane bagasse powder and NaOH alkaline solvent were mixed in a three-necked round-bottom flask. The reactor used in this study was a modified domestic microwave equipped with a temperature controller and condenser. The results showed that this modification was significant to reduce the weight of the residual solid product compared to the initial weight of the raw material. Process variables such as reaction time and solvent concentration significantly affect the cellulose content of solid products. However, hemicellulose content showed different results. The results of the XRD analysis showed that the crystallization index of the effect decreased with increasing pretreatment time. Pretreatment with microwaves and alkaline solvents was successful with satisfactory structural changes in the cellulosic solid.

PRODUKSI BIODIESEL DARI DEDAK PADI SECARA IN SITU DENGAN TEKNOLOGI MICROWAVE Yulia Tri Rahkadima; Qurrota A'yuni
Jurnal Kimia Riset Vol. 4 No. 2 (2019): Desember
Publisher : Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jkr.v4i2.16047

AbstrakProses produksi biodiesel dari dedak padi dengan memanfaatkan microwave secara in situ telah berhasil dilakukan. Pengaruh jumlah metanol dan waktu reaksi terhadap kandungan FAMEs dalam produk dipelajari dalam penelitian ini. Dedak padi , metanol dan katalis basa berupa NaOH 0.6 w% dimasukkan ke dalam labu alas datar dilengkapi dengan kondensor dan dimasukkan ke dalam reaktor microwave yang telah dimodifikasi. Produk reaksi yang berupa campuran FAMEs, gliserol, reaktan yang tidak bereaksi dan komponen lainnya kemudian dicuci menggunakan n- heksana dan dilanjut dilakukan proses distilasi. Hasil penelitian menunjukan bahwa dengan menggunakan reaktor microwave, kandungan FAMEs lebih tinggi diperoleh dengan waktu reaksi yang lebih singkat. Gelombang mikro berhasil mempercepat terjadinya reaksi transesterifikasi. Kandungan FAMEs tertinggi yaitu 6.2036 % diperoleh pada waktu reaksi 10 menit, metanol 60 ml dan suhu reaksi 60oC. Kata kunci : Biodiesel, In situ, Microwave, Dedak padi AbstractThe process of biodiesel production from rice bran using in situ microwaves has been successfully carried out. The effect of the amount of methanol and reaction time on the FAMEs content in the product was studied in this study. Rice bran, methanol and alkaline catalyst in the form of 0.6 w% NaOH are put into a flat bottom flask equipped with a condenser and put into a modified microwave reactor. The reaction product in the form of a mixture of FAMEs, glycerol, unreacted reactants and other components is then washed using n-hexane and contuining with the distillation process. The results showed that by using a microwave reactor, a higher FAMEs content was obtained with a shorter reaction time. Microwaves successfully accelerate the transesterification reaction. The highest FAMEs content of 6.2036% was obtained at a reaction time of 10 minutes, methanol 60 ml and reaction temperature 60oC.Keywords: Biodiesel, In situ, Microwave, Rice bran

PROSES PERLAKUAN AWAL AMPAS TEBU DENGAN PELARUT ASAM DAN GELOMBANG MIKRO SEBAGAI BAHAN BAKU BIOETHANOL MEDYA AYUNDA FITRI; YULIA TRI RAHKADIMA
Jurnal Chemurgy Vol 5, No 2 (2021): Jurnal Chemurgy-Desember 2021
Publisher : Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/cmg.v5i2.6735

Proses pretreatment perlu dilakukan pada penggunaan ampas tebu sebagai bahan baku generasi kedua pembuatan bioethanol. Hal ini dikarenakan sebagian besar kandungan ampas tebu adalah lignoselulosa yang memiliki struktur yang kuat dan susah difermentasi. Proses pretreatment ampas tebu dengan menggunakan senyawa asam dan pemanasan gelombang mikro dilakukan dalam penelitian ini. Penelitian itu bertujuan untuk mengetahui pengaruh varibel proses yaitu konsentrasi senyawa asam (0,1; 0,4 dan 1,0 M) dan waktu reaksi (10-30 menit) terhadap komposisi produk solid yang diperoleh. Penelitian ini dilakukan dengan menggunakan reaktor microwave yang diperoleh dengan memodifikasi microwave domestik dengan alat pengatur suhu dan kondensor refluk. Hasil penelitian menunjukkan bahwa metode yang dirancang pada penelitian ini telah berhasil mengubah struktur selulosa dan hemiselulosa pada produk yang diperoleh. Kenaikan waktu reaksi menurunkan persentase kandungan selulosa dan hemiselulosa pada produk. Pengaruh yang sama juga ditunjukan oleh perubahan konsentrasi pelarut. Kenaikan konsentrasi pelarut menyebabkan semakin kecilnya persentase selulosa dan hemiselulosa yang diperoleh. Hasil penelitian menunjukkan bahwa ukuran kristal pada ampas tebu sebelum dan sesudah reaksi mengalami penurunan. Kata Kunci: perlakuaan awal, asam, gelombang mikro, ampas tebu

THE EFFECT OF CHEMICAL AND MICROWAVE HEATING TREATMENT FOR REDUCING SUGAR RECOVERY Yulia Tri Rahkadima; Medya Ayunda Fitri
Jurnal Kimia Riset Vol. 7 No. 1 (2022): June
Publisher : Universitas Airlangga, Campus C Mulyorejo, Surabaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jkr.v7i1.36189

Microwave heating treatment was the one type of pretreatment process used in the manufacture bioethanol because it can be applied singly or in combination with other chemicals. The purpose of this study was to determine the effect of microwave heating on the pretreatment process using acid and alkaline solvents. The research was carried out in two stages, namely the preparation of raw materials and pretreatment with microwave. At the stage of preparation of raw materials, bagasse was dried for 2 days and then crushed to a size of 50 mesh to uniform the size of the raw materials. The raw materials that have been prepared are then subjected to a pretreatment process. The pretreatment process was carried out using a modified microwave with temperature settings and the addition of a stirrer. 5 grams of bagasse powder and 200 ml of a solution of H2SO4 or NaOH (0.2 M, 0.4 M, and 1 M) were put into a round tool flask and then put into the microwave. Pretreatment was carried out at 180°C with time variables of 10, 15, 20, 25, and 30 minutes. Then the solution was separated from the residual solid by filtration and the solution was neutralized with 1 M HCl. The results showed that the use of acidic and alkaline solvents, high concentrations of solvents can lead to smaller the acquisition of reducing sugars in the liquid product phase. The highest percentage of reducing sugar obtained is 0.559% when using an acid solvent with a concentration of 0.1 M for 20 minutes.

PRODUKSI BIODIESEL DARI MINYAK JELANTAH MENGGUNAKAN KATALIS KALSIUM OKSIDA Yulia Tri Rahkadima; Putri Abdi
Journal of Research and Technology Vol. 2 No. 1 (2016): JRT Volume 1 No 1 Jun 2016
Publisher : 2477 - 6165

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

The transesterification reaction has performed to convert waste cooking oils into biodiesel with assistant of heterogen catalyst of calcium oxide using reactor in a laboratory . The reaction was performed in two stages that is the esterification followed transesterification reaction. The aim of research is to study the effect of temperature and time reaction on viscosity and biodiesel yield. The results showed that obtained biodiesel had viscosity value in accordance with SNI 04-7182-2006 about diesel-fuel viscosity. At lower temperature (40, 45, and 50oC), the longer reaction time could lead to the increasing of biodiesel yield. Meanwhile, at higher temperature reaction (55oC and 60oC) the longer reaction time could reduce biodiesel yield. The highest biodiesel yield was obtained at following reaction condition: temperature reaction 50oC, 6 hours reaction time, ratio oil:MeOH= 1:48 molar ratio, % wt CaO = 8% to weight of waste cooking oil.

Penggunaan Tanah Vertisol Sebagai Bahan Baku Pembuatan Silika Medya Ayunda Fitri; Farikha Alfi Syahriyah; Yulia Tri Rahkadima
Jurnal Teknik Kimia dan Lingkungan Vol. 5 No. 1 (2021): April 2021
Publisher : Politeknik Negeri Malang

Silica is widely used in industry. The aim of this study was to determine the silica content in vertisol soil in Bringinbendo village. This research was started by soaking the soil in aquadest, then washed 3 times and dried it at 110 ° C for 24 hours. Furthermore, smoothed to 250 mesh size. The second stage is the synthesis of silica using the alkaline extraction method and the treatment of acids. 20 grams of soil powder were extracted in 100 ml NaOH (3, 5, dan 7M) while stirring and heated at 80 ° C. Next, 250 ml of aquadest was added and filtered using Whatman paper. The filtrate was titrated with 5M HCl while stirring until the pH reached 7. The suspension was maintained at room temperature for 24 hours, filtered, and 5 times with aquadest then dried. The results of the mass study were that the greatest silica was found in 7M NaOH concentration at 1 hour, namely 2.59 grams and vertisol soil in Bringinbendo Village had silica content in the medium category with a proportion of 77.7%.

IDENTIFIKASI MAKANAN YANG MENGANDUNG BORAKS DENGAN MENGGUNAKAN KUNYIT DI DESA BULUSIDOKARE, KECAMATAN SIDOARJO, KABUPATEN SIDOARJO Medya Ayunda Fitri; Yulia Tri Rahkadima; Trisna Kumala Dhaniswara; Qurrota A’yuni; Anis Febriati
Journal of Science and Social Development Vol. 1 No. 1 (2018): Journal of Science and Social Development
Publisher : Universitas Nahdlatul Ulama Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55732/jossd.v1i1.161

The formation of quality human resources (HR) is influenced by many factors, one of which is about the quality of health of young people at the best level. Borax is a chemical compound derived from heavy metals boron (B). Borax is an anti-septic and bacterial killer. In Regulation of the Minister of Health No. 722 / MenKes / Per / IX / 88 borax is stated as a hazardous material and is prohibited to be used in making food. Bulusidokare Subdistrict, Sidoarjo Subdistrict, is an area that is close to learning environments such as schools and Tutoring, so that it is vulnerable to foods that contain hazardous Food Additives (FA). Therefore, it is necessary to provide counseling training to housewives about the dangers of borax to health and how to analyze the content of borax in a simple and inexpensive way. The test material used is turmeric and toothpicks. While the samples to be tested are pentol, sausage, tofu, and borax. Borax is a FA which is very dangerous for health, the highest dose limit of 10-20 gr / kg of adult bodys weight and 5 gr / kg of body weight of children will cause poisoning and even death. Food ingredients that contain borax experience discoloration on toothpicks that have been soaked in turmeric solution which is red. The method of analyzing the content of borax using turmeric is a simple and inexpensive method because it uses ingredients that are always available at home, and the method of analyzing the content of borax using turmeric can be applied to food ingredients with soft texture.

Co-Authors Abdi, Putri Anis Febriati Ardhana Fitrianah Ardhana Rahmayanti Atik Widiyanti A’yuni, Qurrota Elsa Rosyidah Farikha Alfi Syahriyah Farikha Alfi Syahriyah Laily Noer Laily Noer Hamidah Lily Oktavia Listin Fitrianah Luqman Hakim Luqman Hakim Medya Ayunda Medya Ayunda Fitri Mega Bilqis Suryawantiningtyas Putri Abdi Qurrota A’yuni Qurrota A’yuni Rina Sri Wulandari Trisna Kumala Dhaniswara Waluyo Prasetyo Zahrotul Azizah

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