Purification of biodiesel-derived crude glycerol and its application in plasticizing cassava starch bioplastics
https://doi.org/10.26832/24566632.2024.0903012
Abstract
This study focused on purifying crude glycerol, a by-product of biodiesel production, using acid-precipitation, methanol extraction, and adsorption with acid-activated charcoal. Among the acids tested—sulfuric, phosphoric, and hydrochloric—phosphoric acid proved most effective, producing the clearest glycerol with minimal salt deposition. The purified glycerol was then used to produce bioplastics, which were tested for mechanical properties. The results indicated that Phosphoric acid yielded the clearest glycerol with minimal salt deposition. The resultant salt, potassium phosphate (K2PO4), has potential as a fertilizer. The purified glycerol showed increased density and viscosity, indicating higher purity compared to crude glycerol. The density of the purified glycerol was closer to that of analytical-grade glycerol. Bioplastic 1 (using analytical-grade glycerol) exhibited the highest tensile strength, withstanding up to 4.3N and extending about 104mm before breaking. Bioplastic 2 (using glycerol purified with hydrochloric acid) withstood up to 4.1N, while Bioplastic 3 (using glycerol purified with acetic acid) endured the least stress, withstanding up to 3.8N and extending up to 87mm before breaking. The study demonstrates that phosphoric acid is an effective agent for purifying crude glycerol, significantly enhancing its quality. The purified glycerol, in turn, improves the mechanical properties of bioplastics, making them more durable and suitable for a range of applications. This process not only adds value to the biodiesel production by-product but also contributes to the development of stronger, more versatile bioplastics.
Keywords:
Bioplastic, Cassava starch, Glycerol, PurificationDownloads
References
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