CD Skripsi
Sintesis Biodiesel Dari Minyak Nyamplung (Calophyllum Inophyllum) Menggunakan Katalis Heterogen Nh4-Geopolimer
The catalyst that is used in the biodiesel synthesis is strong alkaline homogeny catalyst which is difficult to separate from the product. Therefore, it is necessary to develop catalyst technology in order to get the production process becomes more economical, applicable, and environmentally friendl, such as geopolymer catalyst. Geopolymer was synthesized by mixing sodium silicate, metakaolin, sodium hydroxide, aquadest, and ammonium nitrate. The obtained geopolymer has alkalinity> 9,3, Si / Al ratio 1,9, and surface area of 52,7 m2/g. This geopolymer was used as a catalyst in the transesterification reaction with variations in process conditions to assess its effect on biodiesel yield. Dependent variables are weight of calophyllum inophyllum oil 50 grams, stirring speed of 400 rpm. reaction time of 120 minutes, and temperature 65oC. While independent are concentrations of catalyst 1%, 2%, 3%, 4% wt/wt and molar ratio of oil:methanol 1:3, 1:6, 1:9, 1:12. Catalysts at a certain concentration will increase the yield of biodiesel, but at excessive concentrations will reduce the yield of biodiesel. While the higher mol ratio of oil:methanol then the higher yield of biodiesel results. The highest biodiesel yield obtained at 3% wt/wt catalyst concentration and mol ratio of oil:methanol 1:12 is 94,14%. Biodiesel produced has 99,60% methyl ester content, density 881,17 kg/m3, kinematic viscosity 3,66 mm2/s, acid number 0,25 mg-KOH/g biodiesel, and flash point 146°C respectively accordance with the standards of Indonesian biodiesel (SNI 7182:2015).
Keywords: biodiesel, catalyst, geopolymer, transesterification, yield
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