Judul: Pemisahan Sitronelal dari Fraksi Kaya Sitronelol dan Geraniol Minyak Sereh Wangi menggunakan Distilasi Molekuler
Abstrak: The aim of this research is to determine the suitable condition of Short Path Distillation (SPD) which can increase the purity of citronellol and geraniol rich fraction by separating the citronellal component and to know the potential yield of SPD. The input material for the process was the citronellol and geraniol rich fraction of Java citronella oil obtained by vacuum distillation. The equipment used was Short Path Distillation KDL 1 unit type falling film evaporator. Distillation process conducted by stepwise increasing of distillation temperature. Operation condition of SPD is managed by fix condition including range of distillation temperature from 58ºC to 62ºC, pressure 10-3 mbar, condenser temperature 10ºC, flow rate 1-2 drop per second, rotor speed 200 rpm. Process parameter was distillation temperature increase of 1ºC and 2ºC in every run as treatment. Citronellal, citronellol, and geraniol content was analyzed using Gas Cromatography and evaluated according to physicochemical properties such as : density, refractive index, and color. The experiments result in an increase of purity level of citronellol and geraniol rich fraction from 41,44% to 60%. The process yield was 54.97%, achieved by stepwise increasing of distillation temperature of 2ºC. It physicochemical properties as follow : density 0.890, refractive index 1.469, and amber wich is according to SNI-06-3953. Meanwhile, by product was obtained has citronellal content 25,87% and it yield was 35.11%.
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Judul: Pemisahan Fraksi Kaya Sitronelal, Sitronelol, dan Geraniol Minyak Sereh Wangi Menggunakan Distilasi Fraksinasi Vakum
Abstrak: The main compounds of citronella oil are citronellal, citronellol, and geraniol, all of which determine the fragrance intensity and price of the citronella oil it self. Separation of those compounds increased the value of citronella oil. The aim of this research is to obtain the optimum amounts of citronellal, citronellol, and geraniol fractions by vacuum of fractional distillation technology. Conditioning process using 30:1 reflux ratio obtioned purer citronellal, citronellol, and geraniol than conditioning process with 10:1 reflux ratio. The separation process was held in 5 - 4 mBar vacuum pressure and the variation of reflux ratio 10:10, 20:10, 30:10. The optimum amounts of citronellal, citronellol, and geraniol was obtioned in the variation of reflux ratio 10:10, they are 90.670 % of 620 ml, 41.101 % of 160 ml, and 53.581 % of 500 ml respectively
Keyword: vacuum fractional distillation, geraniol, citronellol, citronellal, citronella oil

Judul: Cycle Hamilton pada Graf Lengkap, Graf Regular, dan Graf 2-Connected 4-Regular Berorder Kurang dari Sepuluh.
Abstrak: Suatu graf disebut graf Hamilton apabila graf tersebut memuat cycle Hamilton, yaitu cycle yang melewati setiap vertex tepat satu kali. Menentukan keberadaan cycle Hamilton pada suatu graf dapat menggunakan syarat cukup yang berupa teorema-teorema yang telah diperkenalkan sejak tahun 1950-an. Beberapa syarat cukup yang dibahas dalam karya ilmiah ini adalah syarat cukup yang berhubungan dengan graf lengkap dan graf regular. ,,,
Keyword: graf Hamilton, graf regular, graf lengkap, graf 2-connected 4-regular.