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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 7 NO. 2 DECEMBER 2023" : 5 Documents clear
Optimization of Microcrystalline Cellulose from Bagasse (Saccharum officinarum) by Acid Hydrolysis Prayoga, Wahyu Nur Alfath; Aziz, Adit Abdul; Syahrir, Adam; Pitaloka, Alia Badra
World Chemical Engineering Journal VOLUME 7 NO. 2 DECEMBER 2023
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/wcej.v7i2.23125

Abstract

Microcrystalline cellulose (MCC) is a compound produced from refining alpha cellulose with excessive amounts of acidic minerals that has a white visual color, odorless and biodegradable. MCC is often used as an excipient in the pharmaceutical and food industries. This study aimed to determine the content of alpha cellulose from bagasse with varying concentrations of nitric acid and the highest degree of crystallinity produced from microcrystalline cellulose. The research began with drying and smoothing bagasse. Then, the bagasse was delignified using HNO3 solution with a concentration of 5%, 7.5% and 10%, followed by NaOH solution. The sample obtained was bleached using NaClO solution to obtain alpha cellulose. Then, alpha cellulose was hydrolyzed using HCl solution to obtain microcrystalline cellulose. The purity of alpha cellulose with nitric acid concentrations of 5%, 7.5%, and 10% was 37.63%, 32.48%, and 23.73%, respectively, and the highest crystallinity produced was 67.45% in MCC HNO3 10%.
Analysis of Shear Stress on Flow around Sudden Accelerated Plate (Stokes’ First Problem) Sudarma, Andi Firdaus
World Chemical Engineering Journal VOLUME 7 NO. 2 DECEMBER 2023
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/wcej.v7i2.22324

Abstract

Stokes' First Problem, often referred to as the "sudden accelerated plate," was studied using similarity method to obtain velocity and shear stress profile by analyzing the flow of an infinite body of fluid near a wall that experiences sudden motion. The flow is assumed to be Newtonian, viscous, and incompressible, while at initial condition the velocity considered as zero and the condition of the flow were at rest. The obtained results are then numerically solved employing Simpson's approximation. Furthermore, this study explores variations in velocity and shear stress at the wall across different time intervals. The study of the velocity profile within this scenario demonstrates its consistency with the non-slip condition and the specified boundary conditions. Specifically, for t > 0, the velocity of the flow at the surface (y = 0) aligns with the plate's speed, while at y = ∞, the velocity decreases to zero, mirroring the initial condition. The findings reveal that at the moment the plate initiates its motion (t = 0), the shear stress reaches its maximum value. As time progresses, the shear stress at the wall gradually decreases.
The effect of Temperature Drying of Seaweed, Addition of Calcium Hypochlorite, and Potassium Hydroxide on the Quality of Semi-Refined Carrageenan Products Heriyanto, Heri; Astria, Windi; Fattah, Hanif Al; Suhendi, Endang
World Chemical Engineering Journal VOLUME 7 NO. 2 DECEMBER 2023
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/wcej.v7i2.23042

Abstract

Indonesia is a major producer of Eucheuma cottonii seaweed, yet its utilization remains suboptimal. Approximately 80% of seaweed exports consist of raw materials with low market value. The research aims to enhance the quality and market value of seaweed by transforming it into semi-refined carrageenan products. The method used for carrageenan production involves extraction using a KOH solution with different concentration levels using 5%, 7.5%, and 10% (w/v), along with drying temperatures ranging from 80°C to 90°C. Additionally, bleaching treatment is applied using calcium hypochlorite with concentration level using 1.5% and 2.5% (w/v). The analyses conducted include water content, ash content, yield, viscosity, gel strength, and degree of whiteness. The optimal results for semi-refined carrageenan, based on yield analysis, water and ash content, gel strength, viscosity, and degree of whiteness, were obtained from samples with a KOH concentration of 10%, calcium hypochlorite concentration of 1.5%, and drying temperature of 80°C.
Rice Husk Extract and Damar Resin as Corrosion Preventing Bio Coating Materials for Mild Steel in Demineralized Water Hidayatullah, Andra; Irawan, Anton; Pramudita, Marta
World Chemical Engineering Journal VOLUME 7 NO. 2 DECEMBER 2023
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/wcej.v7i2.22832

Abstract

Corrosion is one of the main problems in industry, especially in cooling systems, refinery units, pipelines, chemicals, oil and gas production units, boilers and water processing, paints, pigments, lubricants, and others. The research focused on testing the ability of bio-coating materials of rice husk extract and resin gum using the weight loss method. In contrast, the corrosive medium used was demineralized water. The variations used were soaking time (1, 2 and 3 hours), silica concentration in bio-coating (0, 500, 1000 and 1500 ppm) and temperature (40, 60 and 80oC). From the results of this study, the highest efficiency was 87.39% at a soaking time of 1 hour and a concentration of 1500 ppm. The higher the temperature, the inhibition efficiency decreases; this shows the adsorption mechanism is physisorption.
The Effect of Polypropylene and Low-Density Polyethylene Mixtures in the Pyrolysis Process on the Quantity and Quality of the Oil Products Suhendi, Endang; Heriyanto, Heri; Ammar, Muhammad; Tsania, Ayu; Anam, Muhammad Khairul
World Chemical Engineering Journal VOLUME 7 NO. 2 DECEMBER 2023
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/wcej.v7i2.23121

Abstract

Plastic waste is a type of waste that has economic value when processed properly, one of which is by converting it into fuel oil using the pyrolysis method. Pyrolysis of plastic waste involves the decomposition of materials at high temperatures without the presence of oxygen. This study aimed to examine the effect of the mixture of polypropylene (PP) plastic waste and low-density polyethylene (LDPE) plastic waste in the pyrolysis process on the quantity and quality of the oil products. The ratio of PP:LDPE was varied to 100 kg : 0 kg, 70 kg : 30 kg, 50 kg : 50 kg, and 30 kg : 70 kg. The pyrolysis was conducted at a temperature of 350ºC for 10 hours. The research results show that the highest yield value of 82.24% wt. is obtained at PP:LDPE ratio of 100 kg : 0 kg. Furthermore, the best pyrolysis oil products are obtained at PP:LDPE ratio of 70 kg : 30 kg. The gasoline, kerosene, and diesel fuel products have densities of 760 kg/m3, 776.4 kg/m3, and 873 kg/m3, respectively. Then, the gasoline and diesel fuel have calorific values of 10,836 cal/g and 10,996.5 cal/g. The cetane number of diesel fuel is 42, while the octane number of gasoline is 78.9.

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