Fatty acid hexyl esters: Influence of the reaction parameters on the synthesis and diesel-biodiesel-1-hexanol blend composition on the application properties

Gotovuša, Mia; Krvavica, Matija; Knežević, Andrea; Konjević, Lucija; Parlov Vuković, Jelena; Faraguna, Fabio (2025) Fatty acid hexyl esters: Influence of the reaction parameters on the synthesis and diesel-biodiesel-1-hexanol blend composition on the application properties. Fuel (Guildford), 381 . ISSN 0016-2361

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Abstract

The matter of this study is the influence of reaction parameters – temperature (40–80 ◦C), time (2–60 min), molar ratio of 1-hexanol to waste cooking oil (5:1–12:1), and mass fraction of KOH catalyst (1–3 wt%) – on the synthesis, i.e. reaction conversion, of fatty acid hexyl esters (FAHE). Afterward, larger amounts of biodiesel were synthesized, purified, and blended with 1-hexanol and non-additized mineral diesel, to assess blends’ application properties, as possible transportation fuels used in diesel engines. An increase in biodiesel’s volume fraction up to20 vol% in blends led to an increase in their densities, viscosities, as well as surface tension values. On the contrary, adding 1-hexanol up to 15 vol% resulted in a decrease in these values. Low-temperature properties of diesel–biodiesel blends, e.g. pour point and cloud point and heat of combustion were the same or very close to those of mineral diesel, whereas FAHE significantly improved lubricating properties of diesel. Altogether, application property values of the prepared blends fell within the corresponding guidelines set by the standard EN 590.

Item Type:	Article
Uncontrolled Keywords:	fatty acid hexyl esters; densitie; viscositie; diesel–biodiesel blends; heat of combustion; lubricating properties
Subjects:	NATURAL SCIENCES > Chemistry TECHNICAL SCIENCES > Chemical Engineering TECHNICAL SCIENCES > Basic Technical Sciences
Divisions:	NMR Center
Projects:	Project title Project leader Project code Project type Razvoj funkcionalnih biogoriva i (bio)aditiva te ispitivanje primjenskih svojstava mješavina s mineralnim gorivima-FunBioFA Fabio Faraguna; Petar Ilinčić; Lucija Konjević; Dijana Blažek UIP-2019-04-5242 HRZZ
Depositing User:	Jelena Parlov Vuković
Date Deposited:	30 Dec 2025 08:11
URI:	http://fulir.irb.hr/id/eprint/10648
DOI:	10.1016/j.fuel.2024.133637

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