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All Journal The Indonesian Journal of Business Administration JURNAL REKAYASA KIMIA & LINGKUNGAN
Zenda Christian Adhiatama
Unknown Affiliation
Chemical Engineering, Chemistry & Bioengineering Decision Sciences, Operations Research & Management Energy Engineering

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Note On Portfolio Optimization An Empirical Study using Bisnis Index-27 and Gold as A Portfolio Asset Adhiatama, Zenda Christian; Sukarno, Subiakto
The Indonesian Journal of Business Administration Vol 1, No 2 (2012)
Publisher : The Indonesian Journal of Business Administration

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Abstract

The global economic crisis in 2008, which originated in America impacted quite significant for the world economy. Slowing the growth of the economy was felt by some developed countries that are trading partners of the Americas. Exacerbated by this crisis Europe where some European countries have considerable debt and incriminating the economy of the countries. Decrease in the level of economic growth in developed countries, forcing investors to divert its funds shows that yield higher. Indonesia became a new spotlight for investor to invest their fund because of the economic growth and political stability.The emerge of new investment strategy makes investor confuse to choose the appropiate based on their risk profile. Using optimization model that create by Harry Markowitz and the combination of stock and gold as asset portfolio can be an alternative investment strategy for investor.   Keywords: stocks, gold, IHSG, correlation, modern portfolio, rebalancing
Analysis of Gas Sweetening Unit for Natural Gas Using Membrane and aMDEA Technology with High CO2 Concentration > 60 % in XYZ Field Adhiatama, Zenda Christian; slamet, slamet
Jurnal Rekayasa Kimia & Lingkungan Vol 20, No 1 (2025): Jurnal Rekayasa Kimia & Lingkungan (June, 2025)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v20i1.39423

Abstract

The XYZ field in Jatibarang, West Java, processes 19 MMSCFD of gas with CO2 content over 60%, which does not meet the 8% CO2 limit required by the gas sales agreement. Traditional absorption technologies, while effective, have high energy demands. This study aims to optimize CO2 removal by combining membrane technology with aMDEA solvent-based absorption. Aspen Hysys software was used to simulate this combined approach, with aMDEA solvent chosen for its low corrosivity and high CO2 absorption rate. The membrane technology reduces CO2 levels initially, while the aMDEA solvent further lowers them to below 8%. Simulation results show that the combined system can reduce CO2 levels to 7.949% with a sweet gas flow rate of 7.108 MMSCFD. The process requires a membrane area of 4,611 m and 172,960 lb/hr of solvent. This approach offers an effective solution for gas sweetening in fields with high CO2 concentrations, providing a more energy-efficient alternative to traditional methods.
Co-Authors Slamet . Subiakto Sukarno