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Jurnal Teknik Kimia USU
Published by TALENTA PUBLISHER
ISSN : -     EISSN : 23374888     DOI : https://doi.org/10.32734/jtk.v11i1
Core Subject : Science, Social, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology
Jurnal Teknik Kimia USU merupakan jurnal elektronik yang mempublikasikan karya ilmiah di bidang teknik kimia yang diterbitkan oleh Departemen Teknik Kimia, Fakultas Teknik, Universitas Sumatera Utara. Jurnal ini tidak terbatas pada mahasiswa dan dosen Universitas Sumatera Utara, tetapi terbuka untuk mahasiswa, dosen dan peneliti dari instansi lain.
Arjuna Subject : Teknik Kimia (semua kategori) - Teknik Kimia (Lain-Lain)
Articles 297 Documents
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Solidifikasi/Stabilisasi (S/S) Fly Ash yang Terkontaminasi Fenol sebagai Bahan Subtitusi dan Pengisi pada Pembuatan Beton Fatimah; Muhammad Zikir
Jurnal Teknik Kimia USU Vol. 12 No. 1 (2023): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v12i1.11185

Abstract

This study aims to assess the potential use of fly ash burning coal as a substitution and materials to making concrete filler. Material used in this study were fly ash waste product from PT. SOCI MAS, phenol, Portland cement type I, sand, gravel, and water.The use of fly ash as a substitution done with the variation in the percentage of 0%, 5 %, 10 %, 20 %, and 30 % of the weight of a cement used, and the use of fly ash as a filler material was carried out adding percentage variation of, 0%, 20 %, 40 %, 60 and 65 % of the weight of a cement used.The parameters for concrete are maximum load, compressive strength, water absorption, phenol analysis test amd loose weight metal after solidification/stabilization. The best result of using fly ash as a substitution acquired at 10 % substitution that produces a maximum load of 680 kN, strong press of 32840 MPa, and the water adsorption of 1.275 %, and as a filler best results obtained on the use of the 65 filler % that produces a maximum of 825 kN and strong press of 39.494, and the water adsorption of 0,123 % MPa. The results of the analysis free phenol and metal such as Zn, Cu, Ba are 0.003 ppm, 0.010 ppm, 0.022 ppm, 0.170 ppm. 
Kombinasi Persamaan Rosin-Rammler dan Metode Pengapungan Batang (Buoyancy Weighing-Bar Method) pada Penentuan Distribusi Ukuran Gelembung Air dalam Kerosin Rondang Tambun; Gabriella J J Sijabat; Theresia J Sidebang; Bungaran Tambun
Jurnal Teknik Kimia USU Vol. 12 No. 1 (2023): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v12i1.11269

Abstract

Droplet size distribution is one of the important physical parameters in the industry that use emulsions. In this research, a new method namely the Buoyancy Weighing-Bar Method is used to determine the droplet size distribution. In this research, droplet size distribution of kerosene in water is predicted which cannot be determined by the Buoyancy Weighing-Bar Method is carried out by using a combination of the Rosin-Rammler equation and measurement data by the Buoyancy Weighing-Bar Method. From the research results it was found that the combination of the Rosin-Rammler equation and the Buoyancy Weighing-Bar Method can be performed to predict the droplet size distribution of kerosene in water, and the results are comparable to the results obtained with the Coulter counter method. In the use of various types of bars, variations in bars shape and variations in bar length, the combination of the Rosin-Rammler equation and the Buoyancy Weighing-Bar Method can measure the droplet size distribution of kerosene in water. 
Efek Penambahan Antioksidan dan Demulsifier Secara Polimerisasi Pada Proses Penimbunan Diesel Fuel Oksil Venriza; Ika Gita Lestari; Yudhistira Riesdiawan
Jurnal Teknik Kimia USU Vol. 12 No. 2 (2023): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v12i2.9140

Abstract

B30 is an environmentally friendly fuel used for diesel engines. B30 is very easily contaminated with water sourced from the production process and raw materials from the B30. This water content causes corrosion and has an impact on landfilling. A demulsifier is a way to break down the B30 and water emulsion. In this study, the demulsifier used was acrylate-based and mixed with polar and non-polar solvents. The addition of a demulsifier with a volume of 2 mL, 5 mL, and 10 mL in the stockpiling process with variations of 2 hours, 4 hours, and 6 hours obtained an effect on the volume of water, where the volume of water increases with longer storage time. But the effectiveness of the demulsifier can be evaluated by potentiometrically measuring the water content and FTIR. The demulsifier that was made was also added with an antioxidant in the form of tertiary butylhydroquinone (TBHQ) with a concentration of 0.5 M and obtained more separate water layers than without the addition of TBHQ. To obtain the water content value after adding TBHQ, the coulometric and Fourier Transform Infra Red methods were used, which yielded higher results when compared to the absence of TBHQ. So that antioxidants and dimulsifiers have a positive effect on the process of storing diesel fuel.
Pengaruh Kondisi Operasi terhadap Karakteristik Pengeringan Jahe Merah (Zingiber officinale Var. Rubrum) Menggunakan Tray Dryer dengan Udara Panas dari Proses Pirolisis Rosdanelli Hasibuan; Hamdanah Hasibuan; Yovani Nissi Madani; Viqry Pramananda; Risma Fazillah; Vikram Alexander
Jurnal Teknik Kimia USU Vol. 12 No. 2 (2023): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v12i2.11496

Abstract

Red ginger (Zingiber officinale Var. Rubrum) is a rhizome plant often used as a complementary spice, a mixed ingredient in the food and beverages, and herbal medicines. One of the post-harvest processing of red ginger is drying, which aims to reduce the water content of red ginger to a point where the growth of microorganisms and the activity of enzymes that can damage red ginger can be prevented. This study aims to evaluate the effect of tray height and drying air temperature on moisture content, drying rate, drying characteristics, and quality of red ginger dried using a tray dryer with hot air from a biomass pyrolysis process. The results showed that both tray height and drying temperature affected red ginger's water content and drying rate. The quality of red ginger that complies with SNI 1-3393-1994 was obtained at a tray height of 60 cm and a drying temperature of 70 °C, with distinctive aroma and taste characteristics, the water content of 8,9%; ash content of 5,5%; oil content of 4,93 mL/100 g; and no fungus on the red ginger.
Penggunaan Adsorben Bentonit pada Proses Pencucian Kering dalam Pemurnian Biodiesel Minyak Jelantah Hijrah Amaliah Azis; Mariaulfa Mustam; Nurfika Ramdani; Ida Ifdaliah Amin; Nurmala Sari; Geraldy Gregorius
Jurnal Teknik Kimia USU Vol. 12 No. 2 (2023): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v12i2.11644

Abstract

Biodiesel can be made by utilizing used cooking oil through a chemical process, namely through a transesterification reaction, namely changing the oil (triglycerides) into fatty acid methyl esters. Washing must be done to remove the remaining impurities in biodiesel. The dry washing method is purification by utilizing the adsorption process to remove impurities in crude biodiesel. Bentonite is an alternative adsorbent that can be used as dry washing in the biodiesel refining process because it is cheaper, abundant in nature and has a layered structure with the ability to swell. The purpose of the study was to determine the ability of bentonite activated with acid as a dry washing agent in biodiesel purification. The research method used is the dry washing process method using bentonite adsorbents. The application of bentonite adsorbent as much as 6 grams with a contact time of 3 hours is the best operating condition to produce biodiesel with a pH of 6 and a clarity value of 96.7.
Efektivitas Katalis Zeolit Alam Ende pada Pirolisis Polietilena dari Sampah Plastik Gregorio Antonny Bani
Jurnal Teknik Kimia USU Vol. 12 No. 2 (2023): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v12i2.11822

Abstract

The high amount of plastic waste in landfills will pollute the environment. Direct combustion releases pollutants into the air, and recycling is only possible in small quantities. One method to overcome this problem is pyrolysis. However, pyrolysis requires a catalyst such as zeolite to accelerate the reaction rate, lower the activation energy, and improve the basic properties of the pyrolysis liquid. This study aims to characterize the activated natural zeolite Ende and determine the effect of the catalyst from the activated natural Ende zeolite on the activation energy, as well as the quality of the liquid resulting from the pyrolysis. Based on the research results, the activation process could change the degree of crystallinity became 36.63%, the surface area became 74.57 m2/g, the average radius became 20,21 Å, the pore volume became 72.34 cm3/g, and the number of acid sites became 4.342 NH3/g zeolite. Ende's active natural zeolite catalyst in the polyethylene pyrolysis process from plastic waste reduced the activation energy to 4,371.1 cal/mol in treating 0.10% catalyst composition from 1 kg of plastic. Increasing the temperature and catalyst improves the quality of pyrolysis oil, but the composition of the catalyst ratio is 0.10% of 1 kg of plastic.
Ekstraksi Minyak Atsiri Kulit Jeruk Lemon (Citrus limon (L.) Burm.f.) dengan Pretreatment Microwave dan Distilasi Air-Uap Elvianto Dwi Daryono; Dwi Ana Anggorowati; Firyaal Putri Verdina; Vina Nur Laily
Jurnal Teknik Kimia USU Vol. 12 No. 2 (2023): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v12i2.12923

Abstract

Lemon peel is a waste containing essential oils which can be used as an aroma enhancer in food and drinks as well as aromatherapy. This study aims to determine the effect of microwave pretreatment power and time on the extraction of lemon peel essential oil. The research phase began with microwave pretreatment, namely lemon peel was put into the microwave with pretreatment times of 2 minutes, 4 minutes, 6 minutes, 8 minutes, and 10 minutes with microwave power of 100 W, 200 W, and 300 W followed by water-steam distillation 150 g of lemon peel. Furthermore, the distillate is put in a separatory funnel for ± 12 hours to separate the essential oil and water. The top layer is essential oil added ± 5 g of sodium sulfate (Na2SO4) to adsorb water. The best conditions for the extraction process of lemon peel essential oil was at 300 W microwave power and 2 minutes of pretreatment which produces clear yellowish lemon peel essential oil with a distinctive lemon smell with a yield of 4.88%, limonene content of 27.501%, and refractive index of 1.48.

Page 30 of 30 | Total Record : 297

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