cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Eko Didik Widianto
Contact Email
rumah.jurnal@live.undip.ac.id
Phone
-
Journal Mail Official
jvsarvokasiundip@gmail.com
Editorial Address
Vocational School of Diponegoro University Jl. Prof. H. Soedarto, S.H. Tembalang, Semarang 50275
Location
Kota semarang,
Jawa tengah
INDONESIA
Journal of Vocational Studies on Applied Research
Published by Universitas Diponegoro
ISSN : -     EISSN : 26848090     DOI : -
Core Subject : Engineering,
Engineering
Journal of Vocational Studies on Applied Research [e-ISSN 2684-8090] is an open access peer reviewed journal published by Vocational School Diponegoro University Semarang Central Java Indonesia. Journal of Vocational Studies on Applied Research is an Journal publishing academic and industrial topics which covers area of interest on applied research as well as vocational studies. Research papers on Engineering, Science and Vocational Studies are welcomed. The Journal is double-blind reviewed which accepts Original Research Paper, Short Communication and Review Articles.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 85 Documents
 5   6   7   8   9 
Biodegradable Plastic Synthesis from Sapodilla Fruit Starch (Manilkara zapota): Effects of Chitosan Ratio and Glycerol Concentration Faizulhaq, Muhammad; Hidayat, Rofik Wahyu; Kurniasari, Ayu Pita
Journal of Vocational Studies on Applied Research 2025: JVSAR, Volume 7 Issue 1 Year 2025 (April 2025)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v7i1.27051

Abstract

The productivity of Majalengka sapodilla production has declined, posing significant challenges for sapodilla farmers. This issue is further compounded by the fluctuating availability of land for sapodilla cultivation. Given its nutritional composition, sapodilla fruit holds potential for development into a biodegradable product by utilizing its starch in conjunction with chitosan. The aim of developing this biodegradable product is to reduce the reliance on synthetic plastic for packaging processed foods. This study investigated the water, fat, and protein content in sapodilla fruit, as well as the characteristics of the resulting biodegradable material. The sapodilla starch content was found to be 9%, with a water content of 2%, a fat content of 0.5%, and a protein content of 12.44%. The biodegradable material exhibited a maximum thickness of 0.354 mm at a sapodilla starch to chitosan ratio of 30%:70% with 100% glycerol plasticizer. The maximum degradability percentage achieved was 85.7% at a starch to chitosan ratio of 60%:40% with 100% glycerol. From the degradability tests of sapodilla starch and chitosan biodegradable plastic with glycerol plasticizer, it can be concluded that the optimum degradability value is 88.2% for samples with a starch to chitosan ratio of 60%:40% and a glycerol volume of 100%. This indicates that increasing the volume of glycerol and starch enhances the biodegradable capability.
Heat Integration Analysis of the Pre-Design Stage of an Ethyl Acetate Production Process using Pinch Technology Andini, Gesti
Journal of Vocational Studies on Applied Research 2025: Just Accepted Manuscript and Article In Press 2025
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v0i0.30769

Abstract

Industrial heat exchanger networks often exhibit suboptimal energy utilization because of limited heat integration between process streams. This study aims to optimize a heat exchanger network (HEN) through the application of pinch analysis based on the initial process flowsheet. Hot and cold stream data, including inlet temperature, outlet temperature, and heat load, were first analyzed using Microsoft Excel and subsequently processed using the Heat Integration Network Tool (HINT). Pinch analysis was conducted by constructing composite curves to identify the pinch point, which represents the thermodynamic constraints of the system. Based on the analysis results, a redesigned heat exchanger network was developed in accordance with pinch principles, namely, the elimination of heat transfer across the pinch and the enhancement of internal heat recovery. The results demonstrate that the application of pinch analysis leads to a more efficient heat exchanger network configuration and reduces the reliance on external heating and cooling utilities compared with the initial system.
Energy Optimization of Ethylenediamine Production Process Using Pinch Technology Kusuma, Najwa Putri Indira; Purniawan, Maeza Dhenta; Sulistyaningdyah, Zahwa Sabilla; Mu’minah, Salma Syifa
Journal of Vocational Studies on Applied Research 2025: JVSAR, Volume 7 Issue 2 Year 2025 (October 2025)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v7i2.30765

Abstract

This study presents a comprehensive energy optimization analysis of the ethylenediamine (EDA) production process using Pinch Technology methodology. EDA is a critical chemical compound widely utilized in pharmaceuticals, agrochemicals, polymers, and chelating agents, with its conventional production process being inherently energy-intensive. The research employs HINT (Heat Integration) software to systematically evaluate energy consumption patterns, identify heat recovery opportunities, and design an optimal heat exchanger network for the EDA production system. The production process involves the catalytic reaction between monoethanolamine (MEA) and ammonia at 235 °C and 30 atm, followed by multiple separation and purification stages. Through pinch analysis, process streams were identified and evaluated, revealing significant opportunities for internal heat recovery. The baseline system without integration showed heating requirements of 734.546 kW and cooling requirements of 734.546 kW, totaling 1,469.092 kW of external utility consumption. The analysis determined minimum energy requirements of 439.578 kW for heating and 0.0 kW for cooling utilities, with a pinch temperature of 245 K at ΔTmin of 10 K. The optimized heat exchanger network, comprising eight heat exchangers with a hierarchical configuration (H1: 55.433 kW, H2: 349.878 kW, H3: 102.454 kW, H8: 226.771 kW), achieved a total energy recovery of 735.546 kW. Compared to the non-integrated base case, the implementation of heat integration strategies resulted in remarkable energy efficiency improvements: 31% reduction in heating utility consumption (from 734.546 kW to 509.898 kW), 37% reduction in cooling utility consumption (from 734.546 kW to 440.218 kW), and an overall external utility reduction of 35.3% (from 1,469.092 kW to 950.1164 kW), representing total energy savings of 518.9756 kW. These findings demonstrate that Pinch Technology provides a thermodynamically rigorous framework for achieving substantial energy savings in EDA production facilities, contributing to reduced operational costs, lower greenhouse gas emissions, and enhanced industrial sustainability.
ANALYSIS OF THE PRELIMINARY DESIGN OF A METHYL CHLORIDE CHEMICAL PLANT VIA THE REACTION OF METHANOL AND HYDROGEN CHLORIDE WITH A PRODUCTION CAPACITY OF 45,000 TONS PER YEAR Wicaksono, Dimas Satrio
Journal of Vocational Studies on Applied Research 2025: Just Accepted Manuscript and Article In Press 2025
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v0i0.30770

Abstract

The increasing demand for chemical intermediates in the national chemical industry highlights the need for domestic production to reduce reliance on imports, particularly for strategic products such as methyl chloride. This study presents a preliminary design of a methyl chloride chemical plant with a production capacity of 45,000 tons per year using methanol and hydrogen chloride as raw materials through a catalytic gas-phase synthesis process. The analysis includes mass and energy balance calculations, determination of major equipment specifications, and evaluation of process utility requirements. Furthermore, Pinch Technology Analysis is applied to optimize energy integration within the process by designing an efficient Heat Exchanger Network (HEN). The results indicate that the proposed process is technically feasible and capable of meeting product specifications while significantly reducing external utility consumption through effective internal heat recovery. The integration of preliminary plant design and Pinch Analysis demonstrates strong potential for improving energy efficiency and lowering operational costs, providing a solid basis for further detailed engineering and economic evaluation.
Production of Analog Rice from Mocaf and Soybean-Based Flours for Food Diversification: A Review Mushoffi, Aam Sahal; Kusumayanti, Heny; Nathania, Yessy; Ramadiani, Haliza
Journal of Vocational Studies on Applied Research 2025: JVSAR, Volume 7 Issue 2 Year 2025 (October 2025)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v7i2.30264

Abstract

This systematic review examines the production of analog rice made from Modified Cassava Flour (Mocaf) and soybean flour as part of national food diversification efforts. Through a systematic literature search conducted across Google Scholar, ScienceDirect, and the SINTA database (2013–2025), this review identifies key findings on formulation strategies, extrusion processing, and nutritional characteristics. Previous studies indicate that mocaf–soy analog rice exhibits higher protein content (8–12%), improved fiber levels, and a lower glycemic index compared to white rice. The synergy between mocaf as a carbohydrate matrix and soybean flour as a protein fortifier produces analog rice with enhanced functional and nutritional value. These findings highlight the potential of mocaf–soy analog rice as a sustainable staple alternative supporting food diversification and national food security.

Page 9 of 9 | Total Record : 85

 5   6   7   8   9 

Filter by Year

2019 2025


Reset
Filter By Issues
All Issue 2025: JVSAR, Volume 7 Issue 2 Year 2025 (October 2025) 2025: JVSAR, Volume 7 Issue 1 Year 2025 (April 2025) 2025: Just Accepted Manuscript and Article In Press 2025 2024: JVSAR, Volume 6 Issue 2 Year 2024 (October 2024) 2024: JVSAR, Volume 6 Issue 1 Year 2024 (April 2024) 2023: JVSAR, Volume 5 Issue 2 Year 2023 (October 2023) 2023: JVSAR, Volume 5 Issue 1 Year 2023 (April 2023) 2022: JVSAR, Volume 4 Issue 2 Year 2022 (October 2022) 2022: JVSAR, Volume 4 Issue 1 Year 2022 (April 2022) 2021: JVSAR, Volume 3 Issue 2 Year 2021 (October 2021) 2021: JVSAR, Volume 3 Issue 1 Year 2021 (April 2021) 2020: JVSAR, Volume 2 Issue 2 Year 2020 (October 2020) 2020: JVSAR, Volume 2 Issue 1 Year 2020 (April 2020) 2019: JVSAR, Volume 1 Issue 2 Year 2019 (October 2019) 2019: JVSAR, Volume 1 Issue 1 Year 2019 (April 2019) More Issue