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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 5 Documents
 1 
Search results for , issue "VOLUME 2 NO. 1 JUNE 2018" : 5 Documents clear
Effect of Polycondensation Temperature to Oligomer yield and Depolimerisation Side Reaction Rahmayetty, Rahmayetty; Sukirno, Sukirno; Gozan, Misri
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.v2i1.3467

Abstract

Ring-opening polymerization reaction is the best method for producing high molecular weight polymers. The stage of manufacture of PLA from lactic acid through the lactide ring opening reaction is carried out through three stages of the process ie polycondensation, depolymerization and polymerization. The polycondensation stage of lactic acid is the stage of oligomer formation. At the polycondensation stage, the oligomeric molecular weight is determined by the temperature, pressure, type and concentration of the catalyst used. The purpose of this research was to obtain the effect of polycondensation temperature without catalyst on oligomer recovery and side reactions of depolymerization. Polycondensation is done by pretreatment of lactic acid at 120oC for 1 hour. After that, the heating lactic acid at varying temperatures..OLLA yield at polycondensation temperature 150; 180; 200oC for 4 h and gradually (at 150 oC for 2 h and 180oC for 2 h) were 96.33; 85.36; 82.13 and 88.37% respectively. The higher  polycondensation temperature, the intramolecular interactions of the molecule as a side reaction was increasing.
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.
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
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.
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.

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