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All Journal CHEESA: Chemical Engineering Research Articles
Muhammad Haviz
King Fahd University
Chemical Engineering, Chemistry & Bioengineering Chemistry

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Catalyst Losses and Air Flow Rate Effect on Cyclone Efficiency at Residue Fluidized Catalytic Cracking Unit Rizka Wulandari Putri; Umi Sarah; Ali Hanif; Rahmatullah; Selpiana; Muhammad Haviz
CHEESA: Chemical Engineering Research Articles Vol. 8 No. 1 (2025)
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/cheesa.v8i1.22520.55-62

Abstract

Residue Fluidized Catalytic Cracking Unit (RFCCU) in the oil and gas industry is equipped with a regenerator that uses a cyclone to separate solid catalyst from reaction gases. Oxidation gases rise to the top of the regenerator before entering the cyclone stage. The cyclone inlet velocity depends on factors such as Main Air Blower (MAB) flow, dilute phase temperature, and dense bed temperature. Therefore, this study aimed to determine the effect of catalyst losses and combustion air flow rate on cyclone efficiency of RFCCU. The efficiency was determined simply by calculating catalyst losses compared to the catalyst inlet. The results showed that the dilute phase and dense bed temperature parameters had an indirect influence on cyclone inlet velocity. Furthermore, the separation efficiency of the device was 88% with 12 % catalyst loss by limiting the combustion air flow rate to a maximum value of 1,559 t/d. These limits should be met to prevent cavitation and reduce cyclone efficiency.
Characteristics and Thermal Stability of Biobriquettes Sub-Bituminous Coal and Coconut Shell (Cocos nucifera) Mixture Rizka Wulandari Putri; Rahmatullah; Selpiana; Nyayu Gandasari; Salsabillah Nur Fazrin; Alek Al Hadi; Muhammad Haviz
CHEESA: Chemical Engineering Research Articles Vol. 9 No. 1 (2026): In Progress
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/cheesa.v9i1.24440.53-63

Abstract

Low-grade coal, such as sub-bituminous, is characterized by low calorific value. In this context, combining coal (C) with coconut shell (CS) biomass can upgrade the quality. Therefore, this study aims to analyze the effect of feed ratio and carbonization temperature on improving the biobriquette quality. The processes included preparation, carbonization at 300°C and 400°C, variation in feed ratios, mixing, molding, and drying. Evaluation was conducted for proximate composition, calorific value, combustion rate, and thermal stability characteristics using Thermogravimetric Analysis (TGA) and Differential Thermal Analysis (DTA). The results showed that the biobriquette with 100CS contained 100% CS carbonized at 400°C. Furthermore, it had the best quality, with 5.05% moisture content, 1.83% ash content, 36.11% volatile matter, 57.01% fixed carbon, and a calorific value of 6,075 cal/g. These values met the Indonesian Ministry of Energy Regulation No. 47 of 2006. TGA–DTA analysis showed a total mass loss of 98–99% up to approximately 800°C, featuring the best thermal stability. Based on observation, 100% coconut shell (100CS) provided the best quality. This did not imply that hybrid composition was ineffective. For combustion performance tests, the highest combustion rate was recorded in a mixture of 50C: 50CS, namely 0.3005 g / min. The addition of coal to biomass briquettes aimed to improve combustion performance, specifically through increasing the combustion rate. This suggested that the briquettes are easier to ignite (easy ignition), and heat is generated more quickly. In conclusion, the mixture of coal and coconut shell is suitable for applications that require fast heating, such as cooking activities.
Co-Authors Alek Al Hadi Ali Hanif Nyayu Gandasari Rahmatullah Rizka Wulandari Putri Salsabillah Nur Fazrin Selpiana, Selpiana Umi Sarah