A NEW PROCEDURE OF HYDROTHERMAL LIQUEFACTION OF MICROALGAE AFTER DIFFERENT THERMOCHEMICAL PRE-TREATMENTSстатья

Дата последнего поиска статьи во внешних источниках: 23 января 2020 г.

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[1] A new procedure of hydrothermal liquefaction of microalgae after different thermochemical pre-treatments / M. S. Vlaskin, N. I. Chernova, S. V. Kiseleva, L. A. Dombrovsky // Proceedings of the 16th International Heat Transfer Conference, IHTC-16. — Beijing, China IHTC16-22357 Beijing, China, 2018. — P. 1–7. Various microalgae are considered in the last decade as promising organic sources for biofuel production. A new procedure of hydrothermal liquefaction of microalgae is studied in the present paper. Arthrospira platensis obtained in open pond using the standard Zarrouk’s medium are used in different pre-treatment states: fresh (just after harvesting), dried, freeze and dried-and-mixed with olive oil (25 wt. %). Heating up to 300 oC during 30 min and 60 min exposure at constant temperature is used. The distilled water and olive oil are used in the experiments with dried-and-mixed microalgae. Addition of olive oil modeled the increased concentration of lipids in microalgae biomass. Dichlormethane is added after thermal treatment to extract the oil fraction. The residues obtained after separate water and dichloromethane evaporation referred to as water soluble organics (WSO) and bio-oil (BO) correspondingly. Yields of BO in experiments with fresh, dried, freeze microalgae, and microalgae dried-and-mixed with olive oil are equal to 43.46, 40.68, 42.88 and 43.66 %, respectively. Yields of WSO are equal to 15.19, 23.48, 18.8 and 15.5 %, respectively. The highest yield of BO is reached for fresh microalgae. This result is obtained for Arthrospira platensis. Such pre-treatments as drying and freezing led to decreasing of BO yield becuase microalgae is dehydrated. However, the highest yield of WSO is reached for dried microalgae. It can be explained by a partial destruction of proteins. In experiments with mixture of microalgae and olive oil, an increase in BO and decrease in WSO yields are observed. This is because the product of hydrothermal liquefaction of olive oil contributes mostly to oil fraction soluble in dichloromethane. The results obtained are expected to be useful in biofuel production.

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