Perfil do bio-óleo obtido a partir de diferentes composições de biomassa de Chlorella vulgaris

Abstract

The search for the production of sustainable fuels rescued the interest in microalgae, associating them to the thermoconversion process. Among these, pyrolysis is able to produce bio-oil from cellular components such as lipids, carbohydrates and proteins. The cellular components vary according to the species and external factors such as cultivation time and nutritional stress. The present study aims to produce Chlorella vulgaris cells with different percentages of lipids, carbohydrates and proteins and associates the composition of biomass to the profiles of bio-oils used via pyrolysis. For that, time and nutrient supply were considered in the biomass cultivation stage. The obtained biomasses were pyrolyzed at 500 ° C and the profiles of the bio-oils were analyzed using GC / MS. The different crops resulted in three biomass: one rich in proteins with 43.69% (w/w) of this biocomposite in the cell composition, one rich in carbohydrates, reaching 44.39% (w/w)of the same, and one rich in lipids with 34% (w/w). The bio-oils obtained showed predominantly hydrocarbons in their composition, which reached 60%, in area, in bio-oil from biomass rich in lipids. Besides, bio-oils shows low levels of nitrogen compounds, with a maximum of 2% nitrogen in area for bio-oil from biomass rich in proteins. Other compounds acids such as carboxylic, alcohols, phenols, and ketones have also present in different proportions for each of the bio-oils from the different biomass profiles. As a result, the data obtained show that the composition of C. Vulgaris biomass directly influences the profile of the obtained bio-oil. Thus, the relationship establish in this study contributes to the biomass generated in the process with microalgae to the areas of greatest applicability, adding value to both the process and the product.