CHEMICAL DELIGNIFICATION OF MALANG ARABICA COFFEE HUSK WASTE FOR ALTERNATIVE ENERGY

Malang Regency is an area that has the potential as the largest coffee producer inIndonesia. The coffee processing will produce ± 65% of coffee beans and ± 35% of coffeehusk waste so that in the Malang Regency area with coffee productivity of 9,245 tons, itwill produce coffee husk waste of ± 3,235 tons. The by-product of coffee processing in theform of coffee husk is a waste that has not been used optimally. Generally only used forfodder and compost.Looking at the presence of coffee husk waste and the composition of coffee husk, it has alignin content of 29%, hemicellulose by 24% and the highest cellulose by 33%. Adequatecellulose content of the material for the manufacture of bioethanol is more than 30%, fromthe composition of Arabica coffee husk, the cellulose content is more than 30%. So it hasthe potential to be used as an alternative fuel, one of which is to produce bioethanolproducts. This research aimed to reduce lignin content and increase cellulose content fromcoffee husk waste by chemical treatment using NaOH chemical. The stages of the researchwere coffee husk powder with a size of 80 mesh and weighed 5 grams and put into a glassbeaker. Then added NaOH solution with a concentration of (5.0%; 5.5%; 6.0%; 6.5%; and7.0% (v/v) with a volume of 50 ml. The sample was put in an autoclave at 121 °C for (15,30, 45, and 60 minutes. The best time was 30 minutes with a NaOH concentration of 7%with the highest cellulose content obtained, it was 55%.