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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.
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Articles 6 Documents
 1 
Search results for , issue "Vol 9, No 2 (2022): August 2022" : 6 Documents clear
Hazard Identification of Liquefied Natural Gas (LNG) Transportation and Storage in DKI Jakarta Province Sari Sekar Ningrum; Aidha Zulaika; Dody Guntama
CHEMICA: Jurnal Teknik Kimia Vol 9, No 2 (2022): August 2022
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v9i2.22250

Abstract

LNG is an alternative fuel to replace diesel and gasoline. The use of LNG as a fuel has many advantages from various aspects. Besides having advantages, LNG also has disadvantages because it contains dangers in it. LNG is a volatile material that is easily flammable, which causes fires and explosions. Environmental Risk Assessment (ERA) is a systematic method used to measure the magnitude of the risk of a process and product that is a hazard to human health and ecology. By conducting an ERA, the risks and hazards of LNG are known. In carrying out the research, describing the LNG delivery system, identifying hazards in the event of LNG released from the carrier, making accident scenarios along with the outcome events that will occur, collecting data, calculating the frequency of accidents and their consequences, determining existing risks, and providing preventive actions, and mitigation. Hazard evaluation was determined using fault tree analysis (FTA) and event tree analysis (ETA). Based on identifying hazards to the storage and transportation of LNG, it is classified into category four and server (severe). Scenarios of releasing LNG into the environment in the process of transporting and storing LNG can be caused by several things, including external factors, failure in filling, and failure due to excess pressure so that it can cause fire pools/BLEVE events, cloud vapor explosions, flash fires, and cloud vapors. Based on the level of risk entered into, not tolerable action at the next opportunity.
Biohydrometallurgy for Cobalt Recovery from Spent Li-ion Batteries using Acidophilic Bacteria Isolated from Acid Mine Drainage Asful Hariyadi; Umi Sholikah; Bangkit Gotama; Muhammad Abdul Ghony
CHEMICA: Jurnal Teknik Kimia Vol 9, No 2 (2022): August 2022
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v9i2.22328

Abstract

Nowadays, recycling Li-ion batteries is an important thing to do to minimize the risk of exposure to this hazardous solid waste. On the other hand, extracting these materials can optimize the economic potential of valuable minerals in the active cathode. Bioleaching was developed as an environmentally friendly method to extract cobalt from the cathode by utilizing the metabolic activity of A. ferrooxidants cells. Microorganisms were isolated from Acid Mine Drainage in a 9K liquid medium at pH=2.5 and used as an inoculum. The Bioleaching process was carried out with various cell concentrations of 5, 10, and 20 %v/v. A positive response was shown by monitoring the microorganism activity through changes in physical appearance, decreasing the pH value, and increasing the Fe3+ concentration. The structural analysis of cathode by XRD and SEM has shown the effect of Co dissolution before and after bioleaching. Optimum recovery of cobalt was achieved up to 57.81% after 14 days of incubation.
The Effect of Operating Temperature on the Yield of Liquid Products in the Pyrolysis Process of Used Tires into Fuel Oil Muhammad Irsan B; Hasbi Assiddiq S.
CHEMICA: Jurnal Teknik Kimia Vol 9, No 2 (2022): August 2022
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v9i2.22309

Abstract

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The Effect Of The Addition Of Polyvinyl Alcohol (PVA) Concentrations on the Characteristics of The Carboxymethyl Cellulose (CMC)-Poly (Acrylic Acid) Hydrogel Superabsorbent as a Planting Medium Rahma Falah Maulidina; Dwi Pujiani; Haryanto Haryanto
CHEMICA: Jurnal Teknik Kimia Vol 9, No 2 (2022): August 2022
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v9i2.24428

Abstract

Superabsorbent hydrogel is a hydrophilic network which has the ability to absorb and bind large amounts of water, but is insoluble in water. Hydrogel can be applied in various fields including medical applications, planting medium and waste absorbers. One type of hydrogel that has been widely developed is Carboxymethyl Cellulose (CMC) based hydrogel. However, CMC-based hydrogels still have several shortcomings, namely mechanical properties and low water absorption. In this study, a superabsorbent hydrogel was synthesized from CMC and acrylic acid with the addition of PVA and citric acid as a crosslinking agent and ammonium persulfate as an initiator. This research was conducted to determine the effect of PVA on the characteristics of the CMC-Poly(Acrylic Acid) hydrogel. The variation of the concentration of PVA used was 0% to 2.5% (w/v). The analyzed characteristics include gel fraction, swelling ratio, mechanical properties (tensile strength and elongation). The results showed that the addition of PVA decreased gel fraction from 60.35% to 48.68% and increased the swelling ratio from 719% to 895%. The mechanical properties of hydrogel also increased by increasing the concentration of PVA as seen in the tensile strength value (0.365 MPa to 2.165 MPa) and the percent elongation (13.96% to 30.82%). The results of the FTIR spectrum showed the presence of the OH functional group at the absorption wave number 3284.42 cm-1 and a new absorption band appeared due to the cross-linking at the wave number 1303.88 cm-1 (C-C group).
Green Synthesis of Sulfonated Activated Carbon from Palm Kernel Shell as Potential Catalyst for Hydrolysis of Palm Bunch Cellulose Totok Eka Suharto; Cindy Wulandari; Dwita Oktiarni; Devi Ratnawati; Ibdal Satar
CHEMICA: Jurnal Teknik Kimia Vol 9, No 2 (2022): August 2022
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v9i2.24511

Abstract

Sulfonated activated carbon (SAC) is one of green catalysts that has been successfully synthesized from palm shell waste. The SAC catalysts have been tested in the hydrolysis of cellulose of palm bunch to simple sugar. The SAC catalysts were prepared from palm shell waste by converting to activated carbon followed by sulfonating step. The SAC catalysts were characterized by using XRD, SEM, FTIR and gravimetric methods. The SAC catalysts show as porous amorphous materials and have acidic properties, a prerequisite for good catalytic activity. Preliminary catalytic tests showed that the SAC catalysts can be used for the hydrolysis of cellulose from palm bunch waste that was shown by the existence of reducing sugar in the liquid product of hydrolysis.
Bio-oil from Oil Palm Shell Pyrolysis as Renewable Energy: A Review Joko Pitoyo; Totok Eka Suharto; Siti Jamilatun
CHEMICA: Jurnal Teknik Kimia Vol 9, No 2 (2022): August 2022
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v9i2.22355

Abstract

Oil palm shell (OPS) is biomass with high carbon and hydrogen content, so it has the potential to produce renewable energy through the thermochemical method. Pyrolysis is a relatively inexpensive thermochemical method that continuously converts biomass into valuable gas, bio-oil, and char products. Bio-oil is used directly to fuel boilers and furnaces or to produce fuel oil. This article reviews the pyrolysis process of biomass from oil palm shells, discussing the operating parameters that influence the pyrolysis process and the method of upgrading bio-oil. This review shows a relationship between biomass composition (cellulose, hemicellulose, and lignin) and bio-oil yield. The water content in the raw material needs to be controlled at around 10%. The optimum particle size is closely related to the biomass's natural structure and reactor type. The higher the ash and fixed carbon content, the lower the bio-oil yield. The optimum temperature for pyrolysis is between 450-550 ºC. A high heating rate will increase the decomposition of biomass into bio-oil. Particle size and reactor type strongly influence feed rate, residence time, and reaction time. A fluidized bed reactor gives the highest bio-oil yield. Using plastic in co-pyrolysis and catalyst increases the heating value and decreases the oxygenated content.

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