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Reaktor
Published by Universitas Diponegoro
ISSN : 08520798     EISSN : 24075973     DOI : https://doi.org/10.14710/reaktor.xx.x.xx-xx
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Energy Materials Science & Nanotechnology
Reaktor invites contributions of original and novel fundamental research. Reaktor publishes scientific study/ research papers, industrial problem solving related to Chemical Engineering field as well as review papers. The journal presents paper dealing with the topic related to Chemical Engineering including: Transport Phenomena and Chemical Engineering Operating Unit Chemical Reaction Technique, Chemical Kinetics, and Catalysis Designing, Modeling, and Process Optimization Energy and Conversion Technology Thermodynamics Process System Engineering and products Particulate and emulsion technologies Membrane Technology Material Development Food Technology and Bioprocess Waste Treatment Technology
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 5 Documents
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Search results for , issue "Volume 23 No.1 April 2023" : 5 Documents clear
Performance Evaluation Study of Stripper in CO2 Removal Unit Andika Anugrah; Muslikhin Hidayat; Wahyudi Budi Sediawan
Reaktor Volume 23 No.1 April 2023
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.1.1.21-25

Abstract

An ammonia plant has a very important role in the fertilizer industry. This plant processes natural gas, steam, and air as raw materials into ammonia and carbon dioxide (CO2) products. The ammonia and CO2 products will become feed for the urea plant. One of the units in the ammonia plant is CO2 removal. The CO2 removal unit functions to separate CO2 gas from syngas to be processed to the urea plant, so the performance of the CO2 removal unit is very crucial for the plant. One of the pieces of equipment that supports the performance of the CO2 removal unit is a stripper. This study aims to evaluate the performance of the stripper by arranging a mathematical model and solution for steady-state conditions. One of the stripping performance parameters is CO2 lean loading. Completing mathematical equations using the Matlab program and obtaining profiles of the mole flow rate and temperature along the bed packing stripper. Variables that affect stripper performance include temperature and pH. When compared with operational plant data, the simulation results show an error of below five percent. The optimum operating conditions for the stripping process so that CO2 lean loading is minimum:a. Bottom stripper temperature = 1200C – 1230C,b. pH inlet stripper = 7.9-8.1.
Chitosan-modified fly-ash/kaolin ceramic membrane for enhancing FOG-water separation performance Eny Apriyanti; Heru Susanto; I Nyoman Widiasa
Reaktor Volume 23 No.1 April 2023
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.1.1.26-36

Abstract

Ceramic membranes with efficient construction can save costs and simplify the wastewater treatment process. The price of raw materials and the amount of energy used during the sintering process are the two key factors that affect the final cost of ceramic membranes. This work used kaolin and fly ash recovered from power plants as the support membrane and chitosan as selective layer of composite ceramic membranes. Rigid alumina particles were added to the supports to bring them into alignment with the sintering temperature of the fly-ash/kaolin support. Additionally, the chitosan layer coating increased the supports' bending strength. By simple surface coating, chitosan with different molecular weights was spread over the fly-ash/kaolin supports. The membranes' average pore size radius and porosity were 20 nm and 49%, respectively. The oil removal rate was over 99.8% and the stable permeance was close to 20.5 Lm2h1 when treating oil-water emulsions with 400 mg/L oil content. This is most likely because of the super-hydrophilic performance of kaolin and the electrostatic repulsion between the membrane and oil droplets. The fabricated membranes also demonstrated high antifouling performance by enhancing FRR up to 88% and reduced the reversible fouling ratio. This study suggests that modified membrane has great potential for practical application in oily wastewater treatment.
Synthesis of Some Distinct Curcumin-Based Pyrano [2,3-D] Pyrimidines with Barbituric Acid, Cinnamaldehyde, and Benzaldehyde Kam Natania; Riviana Susanto; Antonius Herry Cahyana
Reaktor Volume 23 No.1 April 2023
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.1.1.1-8

Abstract

Curcumin is a powerful radical oxygen scavenger. The modification of of curcumin’s α, β-unsaturated 1,3-diketone moiety can be carried out to improve its physicochemical stability and functionality. This research aimed to conduct a modification of curcumin structure and to study the antioxidant activity of the modified curcumin-based compound. The modified curcumin made from a combination of benzaldehyde and cinnamaldehyde, using barbituric acid and combination of citric acid as catalyst and ethanol as solvent. The combination of ethanol solvent and 20 mmol% citric acid catalyst produce the highest yield of curcumin product which has a yield of 99.3581±0.2873% and was chosen as the best combination for the next modification using different β-diketone compounds. In the following stage, the mixture was reacted with either benzaldehyde or cinnamaldehyde. Yield, TLC, and antioxidant activity parameters were assessed for all modified products and were accompanied by their characterization using UV-Vis spectrophotometry. This study showed that curcumin cinnamaldehyde had a yield of 47.4831±2.7032%, a maximum wavelength of 416 nm, and antioxidant activity of IC50 18.2130±2.8766 mg/L with a molecular mass of 594 m/z. Keywords: antioxidant activity, benzaldehyde, cinnamaldehyde, curcumin, dimedone, modification
Physicochemical Characteristics of Butterfly Pea Flower Petals Steep Obtained at Different Steeping Temperature and Time Lucia Soedirga; Intan C Matita; Jessica Sidharta
Reaktor Volume 23 No.1 April 2023
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.1.1.9-15

Abstract

Flower is an important part of the plant containing phytochemical compounds, especially the phenolic acids, flavonoids, and anthocyanin that can be used as natural antioxidants. Phytochemical compounds are usually drawn by steeping the flower petals in hot water. Indeed, different temperatures and steeping times would affect the yield of phytochemicals obtained. The butterfly pea flower is one of edible flowers that brings antioxidant activity due to the presence of phytochemical compounds, namely flavonoids and phenolic acids. Nevertheless, there have been limited studies dedicated to the search of steeping condition of butterfly pea flower petals in water. Thus, this study aimed to determine the time and temperature of steeping to produce the butterfly pea step with preferred physicochemical characteristics. The result indicates that butterfly pea flower petals which undergo steeping at 60°C for 45 minutes produce antioxidant activity with an IC50 value of 251.89 ± 32.02 ppm. Furthermore, the butterfly pea flower steep produced had blue to purple color with °Hue of 277.06 ±2.55, 1.23 ± 0.07 mg/L of total monomeric anthocyanin content, 6.83 ± 0.02 of pH and 138.42 ± 15.88 mg GAE / g sample of total phenolic content. Keywords: antioxidant; butterfly pea flower; steep; temperature; time
Redesign of Boiler Heat Recovery Steam Generator (HRSG) on The Utilization of Waste Gas in The Cement Industry Fiqri Hadi Hendriyansyah; Rifania Nendry W.P.; Vibianti Dwi Pratiwi
Reaktor Volume 23 No.1 April 2023
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.1.1.16-20

Abstract

Approximately, 20%-50% of the total energy consumption during cement production is disposed of unintendedly as waste heat. This is very unfortunate considering that this waste heat still has the energy that can be further utilized. The heat recovery steam generator (HRSG) boiler system is one of widely used solutions in the chemical industry process to save operating costs in the chemical industry process. The purpose of this research is to determine the amount of energy that can be saved by implementing the HRSG system under ideal operating conditions. Based on the simulation results, the HRSG boiler design can produce steam with a temperature of 235°C and subsequently reduce the flue gas temperature from 244°C to 140.6°C. The HRSG system produces energy in the power turbine up to 1,756 kW with total energy exchanged in the system of 17,567.38 kW from the total energy in the flue gas of 20,693.96 kW and provides an overall efficiency of 84.61% at steady state conditions.Keywords: Aspen HYSYS, Waste Heat, Heat Recovery Steam Generator (HRSG)

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