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World Chemical Engineering Journal
Published by Universitas Sultan Ageng Tirtayasa
ISSN : -     EISSN : 24432261     DOI : https://dx.doi.org/10.62870/wcej.v8i1.26617
Core Subject : Engineering,
Chemical Engineering, Chemistry & Bioengineering
WCEJ publishes original papers and reviewed papers on the fundamental, theoretical as well as applications of Chemical Engineering. WCEJ is published two times a year. This journal covering some aspects of chemical engineering, which are environmental chemical engineering, chemical reaction engineering, bioprocess-chemical engineering, materials synthesis and processing.
Arjuna Subject : Teknik Kimia (semua kategori) - Teknik Kimia (Lain-Lain)
Articles 85 Documents
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Proposed Implementation of an Integration Inventory Model to Supply Chain System involving Supplier, Manufacture and Buyer. (Study Case: PT. X) Ulum, Rikzan Bachrul
World Chemical Engineering Journal VOLUME 2 NO. 1 JUNE 2018
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/wcej.v2i1.3482

Abstract

PT. X has the problem of how to maintain the stability of the costs charged to each party involved in the supply chain system. In order not to happen one party burden excess costs compared to the other party. The purpose of this research is to determine the optimal number of delivery frequency for customer; determine the optimal delivery quantity of the manufacturing for the customer; determining optimal quantity order from customer, optimal production quantity from manufacturing and optimal material order quantity for supplier; determining total cost of inventory on costumer, total inventory cost at manufacture and total total cost of optimal inventory. With the method used is the application of inventory model integrated in supply chain system involving suppliers, manufacturers and costumer. The results of research can be, the number of optimal delivery frequency is 52 times; The optimal manufacturing quantity delivery for costumer is 659 units; Order quantity of customer is 34,245 units, production quantity from manufacturing is 1,317 units and material order quantity for supplier is 1,317 units; and Total cost of inventory at costumer that is Rp. Rp 17,641,430, -, total inventory cost in manufacturing Rp 28.104.522, - and total cost Rp 45.536.792, -. Thus, if this inventory model can run successfully, will be able to reduce the total cost of inventory on the costumer of Rp. 338,142,997,50 can be saved by 95% to Rp 17,641,430, -, and for total inventory cost in manufacture from Rp 627,979,825.50 can be saved by 96% to Rp 28,104,522, - and the total total inventory cost from Rp 966.122.850, - can be saved by 95% to Rp 45,536,792.
Polylactic acid Synthesis via Direct Polycondensation Method Using Candida rugosa Lipase Catalyst Rahmayetty, Rahmayetty; Barleany, Dhena Ria; Suhendi, Endang; Prasetya, Bayu; Andiyani, Tuti
World Chemical Engineering Journal VOLUME 1 NO. 5 DECEMBER 2017
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/wcej.v1i5.2621

Abstract

Polylactic acid (PLA) is a biodegradable, biocompatible polymer and is produced from renewable natural resources. PLA synthesis through a polycondensation mechanism generally uses a metal catalyst, such as Zn and Sn oxides. The disadvantages of using metal catalysts are the contamination of products produced by the metals used so that unsafe products are used for biomedical applications and food packaging. The purpose of this research is to synthesize the safe PLA used for food packaging and biomedical applications. Polycondensation is done by pretreatment of lactic acid at 120oC for 1 hour. Diluted lactic acid is mixed with Candida rugosa lipise catalyst with a certain concentration (1, 2, 3 and 4% w / w). The mixture was heated at certain temperature (60; 80; 100 and 120oC) and vacuum pressure of 0.1 bar for 72 hours. The highest viscosity and density of PLA in this study was produced at 100oC and using 3% Candida rugosa lipase. The highest viscosity and density of PLA were 2443,9 CSt and 1231,9 mg / l respectively. Candida rugosa lipase concentration does not affect PLA yield at constant polycondensation temperature. PLA yield is affected by temperature. PLA yields at 60, 80, 100 and 120 ° C are 97.98; 97,65; 96.78; 96.13% respectively. The molecule weight of PLA at temperature 100oC for 1436-1482. Lipase concentration does not affect the molecular weight of the PLA.
Exhaust Emission Analysis on Motorcycle with Fuel and Gasoline Mixture of H2O Electrolysis Arwati, I Gusti Ayu; Syamsul, Nurato; Izzati, Titia
World Chemical Engineering Journal VOLUME 1 NO. 4 JUNE 2017
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/wcej.v1i4.1943

Abstract

In this study, researchers used a type of motor 4 stroke 125 cc Suzuki Shogun brands with the year of manufacture 2010. Data collection exhaust emission test performed when the motor before and after wear electrolytes with various mixtures of electrolyte. Data were taken by the engine rotation changes from 1,000 RPM to 4,000 RPM. The highest yield for CO occurred at 4000 RPM with an electrolyte mixture of distilled water and 1 ½ tablespoons of KOH with a value of 1.04%. While the lowest CO occurred at 3,200 RPM when the motor was not used electrolysis with a value of 0.07%. For HC was highest at 1,000 RPM when the motor was not used electrolysis the value of 382 ppm. While the lowest occurred in HC 4,000 RPM with a mixture of distilled water and KOH electrolyte ½ tablespoons of as much as 20.33%. The highest value of CO2 was in the second electrolyte mixture, 8.2%. It was the first mixture between KOH electrolyte and distilled water. In the other hand, the lowest value of CO2 valuewas around 4.1%. It happened for the second time mixture while the motor electrolysis only distilled water and electrolytes itself.
Reverse Flow Reactor for Catalytic Oxidation of Lean Methane Kurniawan, Teguh; Budhi, Yogi Wibisono; Bindar, Yazid
World Chemical Engineering Journal VOLUME 2 NO. 1 JUNE 2018
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/wcej.v2i1.3493

Abstract

Methane as a potential green house gases contributor which gives 21 GWP has to be mitigated to diminish the global warming effect. High concentration methane can be easily converted into CO2 by mean oxidation. However lean methane can only be oxidized in catalytic reaction system as the catalyst lowers the reaction temperature up to 400 oC. Nevertheless, this is still high temperature to achieve by low concentration and low temperature feed. It still needs preheating the feed until its reaction condition reached which can be supplied outside or within the system called auto thermal. One of promising auto thermal reactor is reverse flow reactor which is the reactor that its feed flow periodically switches to make the heat trapped inside the reactor. In this work we have designed reverse flow reactor by one-dimensional model, pseudohomogeneous for mass and heterogeneous for energy to burn lean methane from a station compressor. The critical parameter of switching time on the system of periodical reversal is also presented
The Effect of K2CO3 and Ca(OH)2 Catalysts on The Yield of Syngas Products and Tar Production on Tobacco Waste Gasification with Downdraft Gasifier Type Suhendi, Endang; Dahlin, Julianus Marthin; Almundzir, Yahya
World Chemical Engineering Journal VOLUME 1 NO. 5 DECEMBER 2017
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/wcej.v1i5.2635

Abstract

Nowadays tobacco waste from cigarette production has not been managed properly, only used as fuel on direct combustion process that caused air pollution. To resolve it, indirect combustion method or gasification can be used. Gasification is a thermochemical process that converts solid fuel into a gas capable of fuel known as Synthesis Gas by a combustion process using limited oxygen. Fuel gases and synthesis gases produced by the gasification is used as power generation, heating, chemical products, etc. However, gasification processes also generated condensable organic compounds, so called “tar”. As the processing method, using the catalytic tar decomposition has been widely studied. The purposes of this study is to determine the effect of catalysts K2CO3 and Ca(OH)2 on increasing the composition of synthesis gas produced and decreasing the amount of tar produced. As for the steps of this research are preparation of raw materials, gasification process and analyzing the composition of the syngas. The experimental results show that alkali metal compound (K2CO3) and alkaline earth metal compound (Ca(OH)2) have a catalytic effect to decompose tar contents, to enhance gaseous production. The largest syngas composition produced by the use of Ca(OH)2 catalyst with H2= 10,20 %v; CO = 21,81 %v; dan CH4 = 2,02 %v. On tar reduction, Ca(OH)2 catalyst was better than K2CO3 catalyst with tar production reduced by 34,04%v.
Calories Value of Rice Husk Biobriquette Study as Potential of Renewable Energy in Indonesia Suhirman, Suhirman; Toron, Yustinus S.; Sholehah, Inayatu
World Chemical Engineering Journal VOLUME 1 NO. 4 JUNE 2017
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/wcej.v1i4.1944

Abstract

Energy has an important role in supporting human life so that to get energy source we have to use natural resource optimally. Indonesia has been dependent on fossil fuels but its availability continues to experience scarcity. On the other hand Indonesia is a production country of rice and as the big consumer in the world. Unfortunately the rice husks are not used optimally. This review is knowing how to produce the rice husk briquettes and the factors that are affect quality of briquettes. This paper focus on the optimum factors include the type of adhesive, adhesive composition comparison, particle size, carbonization conditions, settler index and stability that are analyzed for knowing calories value of briquettes.
Effect of Chitosan on the Corrosion Protection of Aluminum in H2SO4 medium Arwati, I Gusti Ayu
World Chemical Engineering Journal VOLUME 2 NO. 1 JUNE 2018
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/wcej.v2i1.3386

Abstract

Metal aluminium alloy 5052 is a metal that has a lightweight nature of its utilization is very wide. In addition to light also has other advantages such as a good introduction to heat. But the weakness of this material is easily corrosive in the acid environment. To reduce corrosion rate is generally used inorganic inhibitors such as cremate, but these inhibitors are toxic and can contaminate the environment. This study aims to reduce the corrosion rate of aluminium alloys by using non-toxic and environmentally friendly green chitosan inhibitors. The method used for coating on aluminium alloys by coating the metal by electrophoresis deposition (EPD).  For corrosion rate testing using weight loss method in 0.5M H2SO4 environment and surface analysis using scanning electron microscope (SEM). The results showed that for 7 days the immersion of Al5052 alloyed uncoated a corrosion rate of 3.571 x 10 -5g / Cm2 days but, after coated with chitosan inhibitor the corrosion rate decreased by 1.73 10 -5 g / Cm 2 days.
Production of Poly Lactic Glycolic Acid from Solid Waste of Palm Starch Industry for Applications in the Field of Medical Biomaterials Purnavita, Sari; Rahayu, Lucia Hermawati; Rinihapsari, Elisa
World Chemical Engineering Journal VOLUME 1 NO. 5 DECEMBER 2017
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/wcej.v1i5.1241

Abstract

Abstract Palm starch industry bring out solid waste that contain high total cellulose (cellulose and hemicellulose), that is 82,03%. Cellulose from solid waste of palm starch industry can be used in lactic acid production through hydrolysis and fermentation processes. Enzymatic hydrolysis and fermentation processes will work efficient and effectively when run simultaneously in one reactor, known as Simultaneous Sacharificatian and Fermentation (SSF). This research aimed to find out the most effective pH and quantity of inoculum in SSF process. This research was using substrate from solid waste of palm starch industry that treated by delignification using NaOH 7% and then saccharificated and fermented simultaneously using enzyme from Trichodermareesei for saccharification process, and Lactobacillus delbrueckii bacteria FNCC 0045 for lactic acid fermentation. The research was held by pH variation of 4, 5, 6 and 7, while quantity of inoculum were 5, 10, 15, 20 and 25% respectively. The incubation was at 46°C for 96 hour. The result showed that optimal pH was 6 and 25% inoculum was the best. Production of PLGA films was started with the polymerization reaction between lactic acid and glycolic acid at various ratios of monomer (wt%) = 95:5 and PLGA :PVA at various ratio (wt%)= 3:2, 3:3, 3:4, 3:5.The solution of PLGA in chloroform was added with PVA solution (as the film forming agents) and aloe vera gel (as an anti-microbial agents) subsequently, and then stirred with a magnetic stirrer for about 10 minutes until homogeneous. The homogeneous PLGA solution thereafter poured on the mold (glass plate). The results showed that the greater the amount of poly vinyl alcohol (ratio 3:5 % by weight), the greater the tensile strength of the film, but the lower elongation. Keywords: solid waste of palm starch industry; lactic acid; SSF;PLGA
Processing Corn Cobs Waste as Bio Briquettes Nugrahaeni, Dela A.I.; Anggraini, Dinar P.; Firmansyah, Arif
World Chemical Engineering Journal VOLUME 1 NO. 4 JUNE 2017
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/wcej.v1i4.1940

Abstract

Corn cobs waste can be processed into bio briquettes, where it can be used asalternative fuels to replace fossil fuels. Making of bio briquettes are easy, low cost,simple technology and friendly to environment. The purpose of making journal biobriquettes are to review characteristics corn cobs waste to get optimal processconditions and analyze calorific value was produced from corn cobs waste. Corn cobs waste is chosen as raw material for making bio briquettes because produce high waste and less utilized optimally. Therefore, corn cobs waste is processed into bio briquettes so can increase economy value. Making of Bio briquettes are expected can be applied in domestic industry and industry developing to fulfill energy needs.
EXTRACTION TOTAL PHENOLIC CONTENT OF KETAPANG LEAVES (Terminalia catappa) USING ULTRASONIC Sari, Denni Kartika; Lestari, Retno Sulistyo Dhamar; M, Muhammad Ridho K.; Lusi, Utami Triana
World Chemical Engineering Journal VOLUME 2 NO. 1 JUNE 2018
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/wcej.v2i1.3387

Abstract

Ketapang leaves (Terminalia catappa) is a plant which has many pharmacological activities one of them is antioxidat activity.  Phenolic compound is one that represented the antioxidant activity. The concentration of phenolic compounds was influenced by the method and condition of extraction. This study was conducted to determine the effect of ultrasonic extraction method, extraction time and the ratio of ethanol : water to total phenolic content in Ketapang leaves (Terminalia catappa). Extraction is completed by ultrasonic extraction method using 96% ethanol-water as solvent with solvent ratio variation (50:50, 60:40, 70:30) in time (5 minutes, 10 minutes, 20 minutes and 40 minutes). Measurment data from total phenolic content of the extracts Ketapang leaves (Terminalia catappa) shows that the extraction with 20 minutes with 96% ethanol-water 50:50 generate the highest total phenolic content, equal to 4862,352941mg GAE / g.

Page 2 of 9 | Total Record : 85

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