Biodiesel from Cotton Oil

(De Gruyter) – Biodiesel is a promising substitute for petroleum-derived diesel usually obtained by the transesterification method, which consists of a reaction between triglyceride and alcohol and a catalyst. Homogeneous catalysts are most commonly used, even though they are toxic, highly flammable and corrosive. In addition, they cause technological problems resulting from the significant generation of effluents and there is difficulty in removing catalyst from biodiesel . Cotton oil is one of the most used feedstocks for biodiesel produced in Brazil. Cotton oil comes from cottonseeds, and is a byproduct from the cotton ginning process to obtain fiber. Therefore, the usage of these feedstocks also generates more income from other byproducts obtained from the oil processing. The authors present a work in which cotton oil biodiesel is produced using CaO from eggshells prepared at different calcination temperatures.

Eggshells are rich in calcium carbonate (CaCO3), which when heated may produce calcium oxide (CaO). CaO is a promising catalyst in transesterification for biodiesel production due to low cost, easy preparation, availability, and non-corrosiveness, and because of its high basic resistance, all meaning less environmental impact. As CaO is produced from CaCO3 it can be obtained from a variety of sources such as calcite, crab shells, oyster shells, snail shells, bones, ostrich eggs and chicken eggs.

CaO from eggshells was prepared at different calcination temperatures and used as a catalyst. All catalysts showed good stability and excellent morphology for biodiesel synthesis. Catalytic activity was evaluated by the methyl transesterification reaction of cotton oil for 3 h, 9:1 methanol:oil molar ratio, 3 wt% (catalyst/oil weight ratio) catalyst and 60°C. Biodiesels showed an ester content of 97.83%, 97.23% and 98.08%, obtained from calcined eggshell at 800°C, 900°C and 1000°C, respectively. Biodiesel quality was affected by the acidity of the cation exchange resin. The kinematic viscosity of biodiesel was in accordance with specification, except for the biodiesel obtained from the calcined catalyst at 1000°C.

The authors conclude that CaO from eggshells obtained at different calcination temperatures is a promising catalyst for cotton seed biodiesel synthesis.


Edited for Content and Length by Dr. Matthew A. Hood.

The  full article can be found at De Gruyter in the journal of Green Processing and Synthesis.

2017 IMPACT FACOR 0.736

DOI: 10.1515/gps-2018-0076


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