Design and simulation of heat exchangers using Aspen HYSYS, and Aspen exchanger design and rating for paddy drying application

Air heating unit is one of the most important parts in paddy drying to ensure the efficiency of a drying process. In addition, an optimized air heating unit does not only promise a good paddy quality, but also save more for the operating cost. This study determined the suitable and best specifications heating unit to heat air for paddy drying in the LAMB dryer. In this study, Aspen HYSYS v7.3 was used to obtain the minimum flow rate of hot water needed. The resulting data obtained from Aspen HYSYS v7.3 were used in Aspen Exchanger Design and Rating (EDR) to generate heat exchanger design and costs. The designs include shell and tubes and plate heat exchanger. The heat exchanger was designed in order to produce various drying temperatures of 40, 50, 60 and 70°C of air with different flow rate, 300, 2500 and 5000 LPM. The optimum condition for the heat exchanger were found to be plate heat exchanger with 0.6 mm plate thickness, 198.75 mm plate width, 554.8 mm plate length and 11 numbers of plates operating at 5000 LPM air flow rate

Future prospects of biobased detergent derived from Jatropha c. seeds oil (JSO)

Commercialized detergents are synthesized by using either branched-chain alkylbenzenesulfonate (ABS) or linear chain alkylbenzenesulfonate (LABS) which contributes to environment issues. To alleviate these issues, Jatropha c. seeds oil (JSO) was used as a potential feedstock of biobased detergent (biodetergent) synthesis. The JSO utilization as non-petroleum sources using potassium hydroxide-hydrogen peroxide technique (POHYPET) was conducted at 40°C. After pretreatment and analysis of JSO, the hydrogen peroxide and sulphuric acid were mixed in a bath stirrer flask. The pH was also controlled, and the added hydrogen peroxide was maintained until the foam quieted down. Objective: This work aimed to synthesize biodetergent from non-edible JSO containing fatty acid as a promising raw material. Effects of processing time, temperature and alkaline concentration on Jatropha c. seed oil biodetergent (JASOB) yield were also investigated. Results: The highest biodetergent yield (88%) was found at the potassium hydroxide concentration of 0.8 M, treatment time of 2 h and operation temperature of 80°C. The physicochemical properties of the examined JASOB was indicated at the foam height (0.7-2.3), emulsification with oil (D), hard water interface (L) and pH (8-9). These performances of JASOB fulfilled the required essential criteria of detergent standard. Conclusion: The obtained JASOB using POPYHET provides impactful results compared another biosurfactants sources, and the prospects of JSO can be deliberated as a renewal of fossil derived surfactants for future biodetergent