Browsing by Author "Helianty, Sri"

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    Home–Based Industry Operating Cost Reduction As Replacement Impact Of The Traditional Stove
    (2016-04-22) Helianty, Sri
    Crispy-fried onions is a popular garnish and flavour enhancing produced by deep frying. Home based industries producing crispy-fried onions use a traditional conventional stoves for heating oil. Since conventional stoves fuel by biomass, such as woods, deep frying process releases toxic fumes that compraises small particles, carbon monoxide, and other noxious fumes. Therefore, replacement the conventional stove stove in crispy-fried onions home-based industries by the gasifier stove is necessary because the gasifier is healthier than the traditional stove. Home-based industries adopt the healthy stove technology for the traditional stove replacement as long as the stove is low-priced fuel intake, easily operated and simply constructed. This study is aim to evaluate energy cost for red onions frying in a home based industry that is production cost component. At the beginning of frying process, initial amount of woods was placed in gasifier stove, than certain amount of wood was added into the gasifier stove periodically for 1 hour. The result shows the gasifier stove requires 0,6 kg of woods / 1 kg fried onions / hour only while the traditional stove requires 1 kg of woods / 1 kg fried onions / hour. These numbers means the energy cost of the healthy stove is lower than the the traditional that effect on variable cost reduction from Rp. 655.000,- to Rp 462.000,-.
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    Transesterifikasi Minyak Biji Bintaro dengan ZnO Catalyst Guard Komersial
    (2013-05-14) Helianty, Sri; Zahrina, Ida
    Proses biodiesel berbahan baku minyak nabati non pangan, seperti minyak biji bintaro (Cerberra odollam), diperlukan untuk mengurangi penggunaan minyak nabati pangan. Katalis heterogen seperti ZnO akan menyederhanakan reaksi transesterifikasi minyak biji bintaro, memudahkan pemisahan katalis dari keluaran reaktor dan mengurangi limbah prosesnya. Penelitian ini ditujukan untuk men-transesterifikasi minyak biji bintaro dengan katalis ZnO catalyst guard komersial. Percobaan transesterifikasi ini diselenggarakan dalam reaktor batch tertutup bertekanan autogenus pada temperatur 373 K selama 4,5 dan 6 jam dengan nisbah minyak biji bintaro terhadap metanol dalam umpan 1:12 w/w. Katalis ZnO komersial ditambahkan ke dalam campuran reaksi sebanyak 5%w-umpan. Selama transesterifikasi berlangsung, campuran reaksi diaduk dengan kecepatan 350rpm. Hasil percobaan pada 4,5 dan 6 jam menunjukkan adanya kenaikkan yield biodiesel, yaitu 13,57%, 22,56% dan 34,52%. Berdasarkan hasil pengujian densitas,visikositas kinematik, angka asam dan flash point, karakteristik biodiesel minyak biji bintaro yang dihasilkan adalah sebagai berikut : densitas 844-909 kg/m3, visikositas kinematik 5,99-9,01 cSt, angka keasaman 0,026-0,039mg KOH/g dan flashpoint 128-154 0C.