| dc.description.abstract | Bioethanol is one kind of renewable energy which is being improved in the
world to fulfill the demands of energy consumption. Bioethanol which was produced
in this research used the hydrolysate of husk cacao waste. The husk cacao is solid
waste plantation which is abundant and hasn’t yet had an amount of usings. The
purpose of this research is knowing the effect of the quantities of bread yeast used in
this research to the length of days fermentation and producing bioethanol got from
the hydrolysate of husk cacao waste by using fermentation process added with tannin
as preventive oxidation in bioethanol such as formation of acetate acid, and using
bread yeast as the source of microorganism to convert into bioethanol. The main
substances are the hydrolysate of husk cacao waste produced from acid hydrolysis
process using sulphate acid 4 M during two hours at 100 oC degree, tannin, and bread
yeast. Afterwards the hydrolysate was fermented in variation sums of bread yeast
3%, 5%, and 7% (w/w) and added with gambier as tannin source in 2, 3, 4, and 5
days and then the hydrolysate was distilled at 80 oC degree by using rotary
evaporator having trade mark Ruchi Evaporator R-205. The result of this research
indicated that the fermentation process produced bioethanol. The quantitative
analysis used GC instrument and the largest content degree of bioethanol was
99,8174% in amount of bread yeast 3% (w/w) in the third day of fermentation and
the largest yield degree of bioethanol was 34,4483% in amount of bread yeast 5%
(w/w) in the fifth day of fermentation. The qualitative analysis used refractometre
having trade mark ABBE to examine refractive index by choosing the sample having
the largest content degree of bioethanol and the result was 1,3285. | en_US |
