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Biocrude production from spirulina platensis via hydrothermal liquefaction

Biocrude production from spirulina platensis via hydrothermal liquefaction / Kee Li En
Objektif penyelidikan ini adalah untuk menghasilkan minyak bio mentah daripada sejenis mikroalga, iaitu Spirulina platensis, dengan kaedah pencairan hidroterma. Pembolehubah bagi kaedah pencairan hidroterma yang dikaji adalah suhu tindak balas (200-300 °C), masa penahanan (5-45 minit) dan nisbah alga kepada air (A/W, 5-25 g/100 mL air). Keadaan optima bagi penghasilan minyak bio mentah tertinggi telah dikenalpastikan dengan menggunakan metodologi permukaan balasan dan reka bentuk komposit pusat. Penghasilan optima minyak bio mentah sebanyak 45 wt.% (daf) didapati dengan menggunakan nisbah 13.78 g/100 mL air pada suhu 275 °C selama 35 minit. Nilai kalori tinggi minyak bio mentah yang dihasilkan pada keadaan optima ialah 36.6 MJ/kg dan komponen utamanya ialah alifatik dan beberapa sebatian yang mengandungi oksigen dan nitrogen. Sebanyak 70% tenaga kimia Spirulina platensis telah dikekalkan dalam bentuk minyak bio mentah. Penyelidikan ini menunjukkan bahawa pencairan hidroterma terhadap Spirulina platensis pada keadaan tindak balas yang lebih ringan dapat menghasilkan minyak bio mentah yang lebih banyak berbanding dengan penyelidikan sebelum ini. _______________________________________________________________________________________________________ This study centers on the hydrothermal liquefaction (HTL) of a strain of microalgae, Spirulina platensis, for biocrude production over different reaction temperature (200-300 °C), holding time (5-45 minutes) and algae/water (A/W) mass ratio (5-25 g/100 mL water). Optimal conditions with respect to the highest biocrude yield were identified using response surface methodology with central composite design. The optimal biocrude yield was 45 wt.% (daf) using 13.78 g/100 mL water A/W mass ratio and conducting the HTL process at 275 °C for 35 minutes. The higher heating value (HHV) of the optimized biocrude product was 36.6 MJ/kg and the main components found in the biocrude were aliphatics and various oxygenated and nitrogenated compounds. About 70% of the chemical energy in the Spirulina platensis biomass was recovered in the form of biocrude product. This study shows that hydrothermal liquefaction of Spirulina platensis at milder reaction conditions is able to produce biocrude of reasonably high yield compared to previous studies.
Contributor(s):
Kee Li En - Author
Primary Item Type:
Final Year Project
Identifiers:
Accession Number : 875006091
Language:
English
Subject Keywords:
hydrothermal liquefaction (HTL); strain of microalgae; Spirulina platensis
First presented to the public:
6/1/2016
Original Publication Date:
5/30/2018
Previously Published By:
Universiti Sains Malaysia
Place Of Publication:
School of Chemical Engineering
Citation:
Extents:
Number of Pages - 88
License Grantor / Date Granted:
  / ( View License )
Date Deposited
2018-05-30 16:28:50.333
Date Last Updated
2020-04-26 11:11:43.458
Submitter:
Mohd Jasnizam Mohd Salleh

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