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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 337 Documents
 28   29   30   31   32 
Ekstraksi Silika dari Fly Ash Pabrik Kelapa Sawit Menggunakan Variasi Pelarut Karbonat Regna Tri Jayanti; Jerry; Miftahurrahmah
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.v12i1.9850

Abstract

The selection of a catalyst is imperative in extracting silica. Calcium is a heterogeneous base catalyst that is abundant in carbonate rocks. This study attempts to extract silica using an artificial carbonate solvent with variations of strong acid HCl (1 M, 3 M, 5 M), NaCl salt (1: 2, 1: 4) w/w ratio to distilled water, and H2O (1: 4) w/w ratio to carbonate. Characteristics of fly ash were analyzed using XRF and XRD to determine the elemental composition, crystal structure, and dominant constituent compounds. The solvent concentration and pH effect in extracting silica from fly ash is reviewed by setting the temperature parameter at 60 C, 120 minutes extraction time, and the ratio between fly ash and carbonate solvent 20 % w/v. The filtrate was verified using UV-Vis to determine the concentration of dissolved silica (SiO2) in the carbonate solvent. The examination results showed that the carbonate solvent with 3 M HCl was able to extract silica better than the other five solvents at 68.17 ppm. 
Pengaruh Laju Alir Biogas dan Ukuran Partikel Pembentuk Pelet terhadap Penyisihan Karbon Dioksida (CO2) dalam Biogas dengan Proses Adsorpsi - Desorpsi Menggunakan Adsorben Berbasis Zeolit Alam untuk Peningkatan Kualitas Biogas Sidabutar, Rivaldi; Trisakti, Bambang; Irvan
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.v12i1.10134

Abstract

Adsorption is the process of fluid molecules contacting the surface of a solid material. This study aims to remove carbon dioxide (CO2) gas in biogas using natural zeolite-based adsorbent pellets by adsorption and desorption of CO2 from the adsorbent using air. CO2 removal was carried out to determine the percentage of CO2 removal efficiency with variations in biogas flow rates (100 mL/minute, 300 mL/minute, and 500 mL/minute) and variations in the type of adsorbent pellets (particle size, activation time, calcination time, and dealumination activation treatment). Determination of the percentage of CO2 removal is carried out by flowing the biogas into the column and contacting it with the adsorbent continuously for 30 minutes and the output gas is collected in a gas collector to analyze the remaining CO2 content. The results showed that the best CO2 removal was 97.7% using an adsorbent with a particle size of 140 mesh, 4 hours of calcination, 90 minutes of activation time, and dealumination activation at a flow rate of 100 mL/minute. The breakthrough characteristic curve presents the characteristic “S” profile at constant flow rate (100 mL/minute).
Karakteristik dan Daya Hambat Mikroba Edible Film dengan Penambahan Filler Kulit Salak (Salacca zalacca) sebagai Pengemas Makanan Dalimunthe, Nisaul Fadilah; M. Thoriq Al Fath; S. Ginting, M. Hendra; Natasya, Tania; Pulungan, Khairunnisa Alifia
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.v12i1.10395

Abstract

An edible film serves to protect and improve food quality. One of the ingredients that can be used is pectin. However, edible films made from pectin have fragile mechanical properties, so snakefruit peel is added as a filler to improve mechanical properties. Edible films were prepared with concentrations from 0%, 2%, 3%, 4%, and 6% (wt), pectin, glycerol (C3H8O3), calcium hloride dihydrate (CaCl2.2H2O) and Tween 80. It was stirred with magnetic stirrer, printed and dried in an oven to test the properties. As a result, the addition of snakefruit peel affected the thickness, swelling, degradation and antimicrobial. The thickness obtained is between 0.024 mm - 0.0172 mm. The swelling results obtained ranged from 0.0409 - 0.0137. The best degradation results were obtained on day 5th, with varying concentrations of 6% snakefruit peel. The results of the study on antimicrobial activity showed that maximal inhibition with varying concentrations of 6% snakefruit peel with an inhibition zone of 20.8 mm.
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 Tambun, Rondang; Sijabat, Gabriella J J; Sidebang, Theresia J; Tambun, Bungaran
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 Venriza, Oksil; Lestari, Ika Gita; Riesdiawan, Yudhistira
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 Penambahan Polyvinyl Alcohol (PVOH) pada Biofoam dari Tepung Biji Nangka dan Ampok Jagung dengan Metode Thermopressing Fitrianti, Yanis; Azzahra, Rheisya Talitha; Kusumawati, Endang; Keryanti
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.v12i2.9228

Abstract

Starch and fiber-based biofoam as a solution to replace the role of styrofoam. However, the biofoam still unqualified as a good foam characteristic. Polyvinyl alcohol (PVOH) is added to improve the physical characteristics of biofoam. This study aims to determine the effect of PVOH addition on the quality of starch-based biofoam from jackfruit seeds and corn hominy. The gelatinization process was carried out using a mixer in 350 rpm speed at 100 °C for 5 minutes, then moulded in a thermopressing unit for 25 minutes at 100 °C. The characteristics of the material with amylose and amylopectin contents 17.30% and 31.60% respectively and corn hominy's fiber content at 2.72%. The best PVOH addition was 10% addition based on its characteristics from parameters such as water absorption, density, and biodegradability were close to Synbra Technology’s standard. However, all the physical and mechanical characteristics of the produced biofoam still can't reach the standard.
Pengaruh Kondisi Operasi terhadap Karakteristik Pengeringan Jahe Merah (Zingiber officinale Var. Rubrum) Menggunakan Tray Dryer dengan Udara Panas dari Proses Pirolisis Hasibuan, Rosdanelli; 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.
Pembuatan Gum Xanthan dengan Proses Fermentasi dari Hidrolisat Selulosa Eceng Gondok dan Penerapannya dalam Enhanced Oil Recovery Ramadhan, Handi; Arif Dharmawan, Wahyu; Susilowati, Titi
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.v12i2.11574

Abstract

Water hyacinth is a freshwater plant that has a negative impact on waters, but has a high cellulose content (77.6%) and is still underutilized. One alternative in controlling the amount of water hyacinth is to utilize its potential cellulose content as an ingredient in xanthan gum. Fermentation was carried out with the help of Xanthomonas campestris and xanthan gum was obtained, which can be used as a polymer injection material to increase crude oil production in the oil refinery industry. The stages to obtain xanthan gum are delignification, hydrolysis, and anaerobic fermentation (28 °C) with a time variation of 24 hours to 120 hours with an interval of 24 hours. The cellulose hydrolysate variable is 0.5%, 1.0%, 1.5%, 2.0%, and 2.5%. The yield of xanthan gum in this research was 18%, with a moisture content was 13% – 15% and an ash content was 3% –3.9%. The resulting xanthan gum was analyzed for its functional groups using Fourier Transform Infra Red (FTIR) and was in agreement with commercial xathan gum.
Penggunaan Adsorben Bentonit pada Proses Pencucian Kering dalam Pemurnian Biodiesel Minyak Jelantah Amaliah Azis, Hijrah; Mustam, Mariaulfa; Ramdani, Nurfika; Amin, Ida Ifdaliah; Sari, Nurmala; Gregorius, Geraldy
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.

Page 30 of 34 | Total Record : 337

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