Environmentally adapted bio-oil compounds-derived polyolesters synthesis: Optimization and properties of base fluids
Document Type
Article
Publication Date
4-5-2021
Abstract
Non-edible bio-oil derived from lignocellulosic biomass could be used as environmentally friendly lubricant-ester base stock for maritime and road-type transportations. However, the use of crude bio-oil with highly oxygenated compounds required further upgrading to yield ester that mimicked the characteristics of Group V base oil (polyolesters). In this study, bio-oil based polyolesters was produced via esterification using green biopolymer alginate acid catalyst (Al-Alg). The bio-oil compounds used were acetic acid (AcA), propionic acid (PrA) and levulinic acid (LA), while polyols such as neopentyl glycol (NPG), trimethylolpropane (TMP) and pentaerythritol (PE) were used. Optimization studies revealed that NPG-PrA ester gave the best ester purity of 100%, with 95% of diester selectivity under optimum conditions of 15 wt% Al-Alg, 8 h, 6:1 PrA:NPG and 140 degrees C. The produced polyolesters showed potential lube characteristics with viscosity index of 76, kinematic viscosity of 2.3 mm(2) s(-1) at 40 degrees C and oxidative induction time of 15 min at 100 degrees C. Furthermore, a reusability study of the Al-Alg catalyst indicated high NPG-PrA diester selectivity (above 90%) for 8 consecutive cycles. The physico-chemical properties of spent Al-Alg catalyst were also discussed.
Keywords
Biomass, Bioenergy, Esterification, Viscosity index, Brown algae alginate
Divisions
nanocat
Funders
Universiti Malaya (GC001B-14AET),SATU Joint Research Scheme RU Grants (ST012-2018) (ST021-2019)
Publication Title
Journal of Hazardous Materials
Volume
407
Publisher
Elsevier
Publisher Location
RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS