Potential Crude glycerol from Transesterification WCO (Waste Cooking Oil) as an anti-fungisida Spray Mohammad Istnaeny Hudha 1 *, Elvianto Dwi Daryono 1 , Endah Kusuma Rastini 1 1 Department of Chemical Engineering, Faculty of Industrial Technology, Institute Technology of National Malang Bendungan Sigura-gura No. 2 Malang (65145) Indonesia Abstract : Waste cooking oil (WCO) can be used as an alternative raw material of biodiesel production with glycerol as a byproduct. Crude glycerol generated should be purified first. Glycerol purification process is done in two stages, namely saponification and acidification process. In the process of saponification strong alkali KOH is added to form the soap and then continued the acidification process with variation of pH 9.7; 9.6; 8.5; 4.7; 4.4 and the concentration of H 3 PO 4 65%, 75%, 85%. This purification process produces byproducts that K 2 HPO 4 and KH 2 PO 4 salt. Both the salt is being used as an anti-fungi spray (fungicide), particularly for powdery mildew on plants mango. In this study, the optimum concentration of phosphoric acid in the purification process of glycerol is 85% phosphoric acid concentration and pH optimum in the process of acidification on the purification of glycerol is pH 9.7 with K 2 HPO 4 salts results and pH 4.7 with salt results KH 2 PO 4 . The melting point of each of the salt is 464 ° C and 252 ° C. As for the anti-fungi spray, K 2 HPO 4 most effective in reducing the powdery mildew of mango plant with an efficiency of 13%. Keywords : waste cooking oil, crude glycerol, saponification, acidification, anti-fungi spray. Introduction Waste cooking oil is the oil derived from oil frying foodstuff from several restaurants 1,2 . Waste cooking oil has always been considered a waste by some communities. The number of exploration conducted to find alternative energy, making the used cooking oil starts to peep utilization. One is as a feedstock for biodiesel production 3,4,5,6 In the manufacture of biodiesel or waste cooking oil transesterification reaction byproducts generated in the form of glycerol with a low level of purity, which is commonly referred to as crude glycerol. The amount of glycerol produced as much as 10-15% of its production capacity with a purity level of glycerol ranges between 40-50% because they contain components of water and other impurities. In Indonesia, currently has a production capacity of biodiesel industry reached 4 million KL/year, it will produce crude glycerol around 400000-600000 tons/year. Increased production capacity biodiesel industry will lead to increased production of crude glycerol, so if it is not accompanied by advances in technology utilization and expansion of the market, the availability of excess glycerol will certainly make the price of glycerol in the world market into fall. Glycerol conversion into other products should be made to avoid any environmental concerns due to the waste glycerol, as well as improve the efficiency of the biodiesel industry 2 . Anti-fungi spray them is one useful product obtained from the purification of crude glycerol. International Journal of ChemTech Research CODEN (USA): IJCRGG, ISSN: 0974-4290, ISSN(Online):2455-9555 Vol.10 No.3, pp 55-61, 2017 CORE Metadata, citation and similar papers at core.ac.uk Provided by Institut Teknologi Nasional Malang Repository