碩士 / 東海大學 / 化學工程與材料工程學系 / 101 / Due to global warming and the depletion of energy, the applications of microalgae get much attention. Microalgae are autotrophic microorganismshaving extremely high photosynthetic efficiency and arevalued as rich source of lipids,it also has great impact on water purifying. In this study, we investigate the following aspect by cultivating the microalgae: (1) Investigate the impact on the concentration ofChlorella vulgaris EXP-06by using flat-plate photobioreactor with changing light intensity. The result showed that the biomass are1.2g/L in higher light intensity. (2)Investigate the impact on the concentration ofChlorella vulgarisEXP-06by using helical-tubular photobioreactor with changing different aeration(vvm), add the pressure, cultivate enlarge. The result showed that when the greater the amount of ventilation, the algae concentration does not increases, and the maximum concentration of 0.5 vvm was 6.1 g/ L, and the maximum concentration of 1 vvm was 5.7 g/ L.The reason for the greater amount of aeration of the liquid driven by the more that the algae can’t effectively use the CO2.In the pressurized experiment, the concentration of algae with pressurizing is much heavier than which without pressurizing in initially. However, the result is contrary in final.This phenomenon is considered to be pressurizing might beneficial to increase the solubility of carbon dioxide that seems to be beneficial for the growth of algae; however, with pressurizing also increases the solubility of oxygen which inhibits the growth.In scale up experiment, the highest concentration of algae can up to 4.3 g / L in 10 L culture.
This experiment is using supercritical methanol and vegetable oil (soybean oil) in the reactor for the transesterification of the four directions discussed. (1) Pressure effect,the results show that pressure does not directly impact on supercritical methanol. The need at the appropriate temperature conditions, the pressure change will be clearly showing effects. (2) Temperature effect,the results found that the temperature at 180 ℃, the reaction yield is low (approximately 70 %). When the reaction temperature is close to the supercritical methanol temperature, the reaction yield will reach 87 percent. Then raise the temperature; the curve of the yield will drop down rapidly. (3) The reaction Time,the result shows that when methanol is completely changed to the vapor of methanol, and pressurized to 290 bar, in a short reaction time, it only takes about five minutes to complete the whole reaction. (4) The effect of adding catalyst,the results show that yield is low in low temperature and 180 bar when the catalyst is not added, only have 46 %. However, the rate is increased to 80 % and 75 % by adding the catalyst Sr2SiO4 and TiO2-ZrO2. The study results tell it is very effective to decrease the reaction temperature and pressure by added catalyst, in addition, it can also improve yield.
| Identifer | oai:union.ndltd.org:TW/101THU00063016 |
| Date | January 2013 |
| Creators | Chin Shan Shih, 施金杉 |
| Contributors | Hong-Wei Yen, 顏宏偉 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 81 |
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