IN-SITU-TRANSESTERIFICATION OF COTTON SEEDS OIL (GOSSYPIUM SPP) USING CaO DERIVED FROM EGG SHELL AS CATALYST

Y. Ibrahim, Abba Maman Manirou & Surajo Ali

Department of Chemistry and Physics, Umar Suleiman College of Education Gashua

Community Health Department, College of Health and Technology Nguru, Nigeria.

Email:ibrazuby@yahoo.com

ABSTRACT

In-situ-transesterification of cottonseed oil (Gossypium spp) was carried out with 5g calcium oxide derived from egg shell as catalyst using soxhlet extraction apparatus and 1:1 of n-hexane to methanol. All the transesterification reactions were carried out at 60⁰C for 2 hrs. The results produced a biodiesel with 35.75% yield, water and sediment content 0.08%, density 0.85g/cm³, specific gravity 0.85, saponification value 16.83mgKOH/g, acid value 0.79mgKOH/g, iodine value 59.22I₂/100g, cetane number 357.28, and high heating value 47.85MJ/kg. The GC/MS results indicated the presence of tetradecanoic acid methyl ester, hexadecanoic acid methyl ester, 11-octadecenoic acid methyl ester, 6-octadecenoic acid (z)-methyl ester, octadecanoic acid methyl ester, n-hexadecanoic acid oleic acid and 2-ethyl-2-hexanal. Thus, the processing of cottonseed oil into methyl ester using soxhlet extraction method is recommended as it required low energy input as compare to conventional method.

Keywords: transesterification; biodiesel, cottonseed; GC/MS.