cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Agus Aktawan
Contact Email
agus.aktawan@che.uad.ac.id
Phone
-
Journal Mail Official
chemica@che.uad.ac.id
Editorial Address
-
Location
Kota yogyakarta,
Daerah istimewa yogyakarta
INDONESIA
CHEMICA Jurnal Teknik Kimia
Published by Universitas Ahmad Dahlan
ISSN : 2355875X     EISSN : 23558776     DOI : 10.26555
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Energy
CHEMICA Jurnal Teknik Kimia ISSN, 2355-875X (print) 2355-8776 (online) is a journal that publishes manuscripts or scientific papers in Chemical Engineering. The scope of this journal covers chemical reaction techniques, separation, optimization, process control, process system engineering, waste treatment, food and material technology. Journals are published in print and online twice a year, in June and December by Chemical Engineering Program, Faculty of Industrial Technology, Universitas Ahmad Dahlan Yogyakarta.
Arjuna Subject : -
Articles 4 Documents
 1 
Search results for , issue "Vol 10, No 2 (2023): August 2023" : 4 Documents clear
Glycerol Acetylation: Effect of Graphene Oxide Catalyst Mass Percentage on Glycerol Conversion and Acetin Selectivity Nur Hidayati; Eggy Juan Prasetyo; Wahyu Annisa Mega Brilianti; Herry Purnama; Malik Musthofa; Anisa Ur Rahmah
CHEMICA: Jurnal Teknik Kimia Vol 10, No 2 (2023): August 2023
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v10i2.25909

Abstract

Glycerol, a byproduct of the transesterification reaction has a wide range of applications. Acetylation is a promising method for converting surplus glycerol into mono-, di-, and tri-acetin, which is used in the cosmetic, pharmaceutical, polymer, and fuel additive sectors. The kind of catalyst and reaction conditions influence glycerol conversion and acetylation selectivity. Acetylation of glycerol was performed in this study by reacting acetic acid and glycerol with a graphene oxide catalyst produced using the Hummers method. The amount of graphene oxide catalyst (3%, 5%, and 7%) in the reaction mixture was adjusted to see how it affected glycerol conversion and reaction product selectivity. Other variables such as the glycerol:acetic acid mole ratio of 1:9, reaction temperature of 120oC, stirring speed of 1000 rpm, and reaction time of 120 minutes were held constant. Glycerol conversion improves with increasing catalyst mass in the reaction mixture, with the highest conversion (92.1%) achieved when employing a 7% catalyst mass, with its selectivity to monoacetin, diacetin, and triacetin being 70.2%, 4.2%, and 25.6%, respectively.
Formation of Phosphate Crystals from Cow Urine Using Aeration System Batch Reactor Nur Hidayatul Fitri; Adityas Agung Ramandani; Devy Cendekia; Dedi Teguh
CHEMICA: Jurnal Teknik Kimia Vol 10, No 2 (2023): August 2023
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v10i2.26595

Abstract

The waste generated from the livestock sector is cow urine containing nitrogen, sulfur, phosphate, ammonium, sodium, manganese, iron, silica, chlorine, magnesium and calcium. The aim of this research is to reduce phosphate levels which will have an impact on the environment caused by cow urine which contains phosphate and ammonium and forms phosphate crystals using a batch reactor with an aeration system. The results of wastewater treatment using a batch reactor produce precipitate in the form of phosphate crystals which can be used as fertilizer for plants. This study used a completely randomized design (CRD) with two repetitions, namely with a comparison of the rate of aeration (air flow) 1 Lpm, 1.5 Lpm and 2 Lpm with the time used, namely 0 minutes, 60 minutes, 120 minutes, 180 minutes and 240 minute. Based on research that has been done, the highest aeration rate (air flow) in phosphate removal in cow urine waste is at 1 Lpm air flow with a time of 240 minutes and a phosphate removal efficiency of 84.8822%. Meanwhile, at an air flow of 1.5 Lpm with a time of 60 minutes and a phosphate removal efficiency of 95.4315%. At an air flow of 2 Lpm with a time of 240 minutes, the removal efficiency can only be 34.3421%. The content of phosphate crystals obtained from the XRF results was obtained at 3.173%. At an air flow of 2 Lpm with a time of 240 minutes, the removal efficiency can only be 34.3421%. The content of phosphate crystals obtained from the XRF results was obtained at 3.173%. At an air flow of 2 Lpm with a time of 240 minutes, the removal efficiency can only be 34.3421%. The content of phosphate crystals obtained from the XRF results was obtained at 3.173%.
UTILIZATION OF BAMBOO WASTE BY ENGINEERING ACID HYDROLYSIS (H2SO4) TO PRODUCE FURFURAL COMPOUNDS Nur Hidayatul Fitri; Adityas Agung Ramandani; Devy Cendekia; Dedi Teguh
CHEMICA: Jurnal Teknik Kimia Vol 10, No 2 (2023): August 2023
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v10i2.26609

Abstract

Bamboo waste containing lignocellulosic can be used as a material for forming furfural compounds. Furfural is an intermediate product that is widely needed by the chemical industry in the manufacture of finished products such as resins, disinfectants, lubricating oils, synthetic rubber, and so on. This product can be produced from materials containing pentosan. The purpose of this study was to determine the effect of the delignification process on pentosan levels,yield and characterization of the resulting furfural, as well as the potential of pentosan to become furfural compounds. In this study the formation of furfural from bamboo waste was carried out using the acid hydrolysis method, with the independent variables namely cooking temperatures of 90 oC, 100 oC and 110 oC, H2SO4 concentrations of 5%, 10% and 15% and cooking times of 60 minutes, 90 minutes , and 120 minutes. Based on the results of research that has been done, it is known that the delignification process has an influence on the pentosan level, where the sample without delignification obtained a pentosan level of 11.10% and using the delignification process obtained a pentosan level of 14.67%. Characterization of furfural analysis results by color test showed a change in color to red and based on the results of GC-MS analysis at retention time 24.
Preliminary study of production electrolytic silicon from silica amorphous in alkaline media Muhammad Miftahur Rahman; Franky Michael Hamonangan Siagian; Yogi Tri Putra Nasution; Widi Astuti; Ulung Sutopo; Himawan Tri Bayu Murti Petrus
CHEMICA: Jurnal Teknik Kimia Vol 10, No 2 (2023): August 2023
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v10i2.26735

Abstract

This study used direct electrowinning to examine the viability of producing silicon from amorphous silica in alkaline conditions. The Indonesian Dieng Geothermal Power Plant provided a sample of geothermal sludge with a high silica (SiO2) content. The samples were analyzed using various analytical techniques (XRF and XRD) before to electrolysis to ascertain their chemical composition and mineralogy. At low temperatures (30°C), the direct electrowinning method using amorphous silica suspended in sodium hydroxide (NaOH) was introduced. Current density adjustments were made to determine the direct electrowinning method's ideal operation. XRD and XRF analyses were performed on cathode deposits and residues in electrochemical cells to ascertain the chemical composition and current recovery. At a current density of 1250 A/m2, the low-temperature electrolysis current efficiency on natrium silicate solution can approach 34% recovery. Geothermal sludge was used to investigate the process, and the process's mediocre performance was caused by the problematic adsorption of amorphous silica particles on the cathode.

Page 1 of 1 | Total Record : 4

 1 

Filter by Year

2023 2023


Reset
Filter By Issues
All Issue Vol. 10 No. 3 (2023): December 2023 [Available online since December 26, 2023] Vol. 10 No. 2 (2023): August 2023 [Available online since October 02, 2023] Vol 10, No 2 (2023): August 2023 Vol 10, No 1 (2023): April 2023 Vol 9, No 3 (2022): December 2022 Vol 9, No 2 (2022): August 2022 Vol 9, No 1 (2022): April 2022 Vol 8, No 2 (2021): December 2021 Vol 8, No 1 (2021): June 2021 Vol 7, No 2 (2020): Desember 2020 Vol 7, No 1 (2020): June 2020 Vol 7, No 1 (2020): Juni 2020 Vol 6, No 2 (2019): Desember 2019 Vol 6, No 1 (2019): Juni 2019 Vol 5, No 2 (2018): Desember 2018 Vol 5, No 1 (2018): Juni 2018 Vol 5, No 1 (2018): Juni 2018 Vol 4, No 2 (2017): Desember 2017 Vol 4, No 2 (2017): Desember 2017 Vol 4, No 1 (2017): Juni 2017 Vol 4, No 1 (2017): Juni 2017 Vol 3, No 2 (2016): Desember 2016 Vol 3, No 2 (2016): Desember 2016 Vol 3, No 1 (2016): Juni 2016 Vol 3, No 1 (2016): Juni 2016 Vol 2, No 1 (2015): Juni 2015 Vol 2, No 2 (2015): Desember 2015 Vol 2, No 2 (2015): Desember 2015 Vol 2, No 1 (2015): Juni 2015 Vol 1, No 2 (2014): Desember 2014 Vol 1, No 2 (2014): Desember 2014 Vol 1, No 1 (2014): Juni 2014 Vol 1, No 1 (2014): Juni 2014 More Issue