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INDONESIA
JURNAL KONVERSI
Published by Universitas Muhammadiyah Jakarta
ISSN : -     EISSN : -     DOI : -
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering Industrial & Manufacturing Engineering
Jurnal Konversi Jurusan Teknik Kimia Fakultas Teknik Universitas Muhammadiyah Jakarta adalah jurnal nasional berbasis penelitian ilmiah, secara rutin diterbitkan oleh Jurusan Teknik Kimia Fakultas Teknik Universitas Muhammadiyah Jakarta
Arjuna Subject : -
Articles 6 Documents
 1 
Search results for , issue "Vol 1, No 1 (2012)" : 6 Documents clear
BAHAN BERBAHAYA DAN BERACUN (B-3) DAN KEBERADAANNYA DI DALAM LIMBAH Suratmin Utomo
JURNAL KONVERSI Vol 1, No 1 (2012)
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/konversi.1.1.%p

Abstract

Pemahaman tentang bahan berbahaya dan beracun (B-3) masih terbatas pada masyarakat yang terlibat langsung dalam penanganan atau masyarakat akademisi tertentu.Bahkan banyak orang mengira keberadaan B-3 hanya pada lingkungan industri atau pabrik. Hal ini disebabkan kurangnya sosialisasi mengenai hal tersebut.Dalam kehidupan manusia dimanapun keberadaannya, hampir dipastikan tidak akan terhidar dari bahan B-3,tertamasebagaibahan terpakai atau sisa (bekas), seperti halnya bahan-bahan yang digunakan sebagai alat rumah tangga atau bahan primer (kebutuhan sehari-hari) seperti: bahan pembersih, pembasmi serangga, gas lampu pijar dan sebagainya. Dengan mengerti dan memahami sifat dan karakteristik B-3, diharapkan seseorang bisa mengelolanya secara baik dan aman. Kata kunci: B-3, limbah
REVIEW ON HARD SEGMENT INFLUENCESON THE PHYSICALPROPERTIES OF THERMOPLASTICPOLYURETHANES Nurul Hidayati Fithriyah
JURNAL KONVERSI Vol 1, No 1 (2012)
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/konversi.1.1.%p

Abstract

Thermoplastic polyurethanes (TPUs) are the fastest growing market in polyurethane technology mainly due to their easy process ability, versatile properties and recyclable nature. They find applications in high performance materials like coatings, adhesives, fibres and foams in a variety of industries ranging from automotive and footwear to medical implants. TPUs are linear block copolymers comprising of alternating soft and hard segments. The versatile properties of TPUs are usually attributed to their phase-separated morphologies. Different parameters are known to affect TPUs physical properties. One of those is their chemical architecture that is the statistical arrangement of hard segments (HS) and soft segments (SS).In particular the architecture of the HS will influence the molecular structure and intermolecular interaction. Its role as physical crosslink sites will govern thermal, mechanical and morphological properties. Hence a modification of HS chemical architecture might adjust the ultimate properties of TPU. This implication is important in process control of production and design of application. Therefore this paper will review various studies to understand the effect of different architecture to the properties of TPU. Keywords: thermoplasticpolyurethanes, hard segment architecture, physical properties
PENGARUH WAKTU REAKSI TERHADAP BILANGAN HIDROKSIL PADA PEMBENTUKAN POLYOL DARI EPOKSIDASI CPO DAN CURCAS OIL Syamsudin Abdullah
JURNAL KONVERSI Vol 1, No 1 (2012)
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/konversi.1.1.%p

Abstract

Penelitian ini bertujuan mempelajari pengaruh waktu reaksi dalam pembuatan plasticizer dan bahan intermediet dalam industri plastikdari bahan minyak Jarak Pagar (Curcas Oil) dan minyak Kelapa Sawit (CPO).Penelitian dilakukan dengan mencampur 100 ml minyak jarak pagar dan 100 ml minyak kelapa sawit, kemudian memanaskannyabersama asam asetat 47 %, hidrogen peroksida 50 %, dan katalis asam sulfat 1% dari jumlah minyak total pada suhu 70°C. Perbandingan mol asam asetat : hidrogen peroksida adalah 0,3 : 1,7 dan waktu operasi divariasikan. Epoksihasil epoksidasi ini dipisahkan menggunakan larutan sodium bikarbonat jenuh dan sodium sulfat. Epoksi20 ml kemudian direaksikan dengan etilen glikol 30 ml ditambah katalis asam sulfat 1% dari jumlah pereaktan total pada suhu 120°C dan waktu operasi divariasikan,sehingga didapat senyawa poliol yang kemudian dipisahkan. Dari penelitian ini diketahui kondisi optimum epoksidasi dicapai pada waktu reaksi 2 jam dengan bilangan oksiran 3,5360 % serta densitas epoksi 0,945 g/ml. Pada produksi poliol didapat bilangan hidroksil 4,8588 % pada waktu reaksi optimum 1 jam dengan indeks bias poliol 1,4705.Dengan demikian didapat korelasi % Bilangan Oksiran terhadap waktu epoksidasi (jam) adalah: Y1 = -0,4777X2+ 1,9093X + 1,616. Sedangkan korelasi % Bilangan Hidroksil terhadap waktu produksi poliol (jam) yaitu:Y2 = -1,2922X2 + 3,332X + 2,6758. Kata kunci: bilangan hidroksil, bilangan oksiran, epoksidasi, CPO, curcas oil
KONVERSI LIMBAH CAIR TAHU MENJADI GAS BIO MENGGUNAKAN AKTIVATOREFEKTIF MIKROORGANISME 4 (EM4) Ismiyati Ismiyati
JURNAL KONVERSI Vol 1, No 1 (2012)
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/konversi.1.1.%p

Abstract

ABSTRACT. Tofu liquid waste has a high potential to pollute water ecosystem, because so far it is disposed as is to sewerages around tofu factories. Nevertheless, tofu liquid waste is potentially convertible into biogas because it has BOD and COD exceeding 4000 mg/lt.The production of biogasfrom tofu liquid waste using an activator Effective Microorganism (EM4) is influenced by several underlying factors: volumes of waste,goat rumen and EM4. The objective of this study is to understand the feasibility of tofu liquid waste as a raw material of biogas, using additional materials of goat rumen and EM4 activator. The experiments were carried out in 5 batch reactors filled with 3000 ml waste and 300 ml rumen, and added with EM4activator varied for 0 ml, 25 ml, 50 ml, 75 ml and 100 ml. Based on our observations, it can be concluded that the addition of EM4in a batch process is positively correlated to the organicdecay of tofu liquid waste into biogas. The best result was observed in Reactor IV containing 75mlEM4where the biogas was produced after 72 hours. Keywords: tofu liquid waste, EM4 activator, cattle rumen, biogas
CERAMIC ARMOR WILL BE REPLACED BY COMPOSITE ARMOR VERY SOON* Soeyatno Soeyatno
JURNAL KONVERSI Vol 1, No 1 (2012)
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/konversi.1.1.%p

Abstract

Ceramic armors have existed for more than 30 years. They replaced the much heavier metal armor.One of the biggest producers of ceramic armor is Bittosi in Spain. It is a confidential product with no open promotion. Ceramic armor is the side products of Bitossi. Their main products are alubit liming and balls for ceramic industry, paint and pharmacy. Their ceramic armors have been used by many countries in Europe and by NATO. Actually, ceramic armor is still too heavy for soldiers since itweighs approximately 8.6 kg depending on size, and is still too rigid. Therefore, people are still looking for more convenientmaterials, which is resistant to shooting, flexible, and lighter.The answer is composite productdeveloped by De Staat Mijn-DSM Research Campus Geleen of the Netherlands, specialist in polymer research. They have proved it very successfully in shooting test. It is flexible and weighs only about one third of ceramic armor. The composite is produced from 20 layers of 0.15 mm thickPE (Poly Ethylene) sheets,reinforced by carbon fibers. Since it is far better than ceramic armor, the composite armor will replace ceramic armor very soon. It is only a matter of time. Keywords:ceramic armor, composite
PENGARUH JUMLAH SUKROSA PADA PEMBUATAN NATA DE PINA DARI SARI BUAH NANAS Yustinah Yustinah
JURNAL KONVERSI Vol 1, No 1 (2012)
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/konversi.1.1.%p

Abstract

Salah satuupaya penganekaragaman makanan olahanbuah nanas di Indonesia selain untuk hidangan pencuci mulut, sirup, selai, dan buah kalenganadalah pembuatan Nata de Pina dari sari buah nanas.Penelitian ini bertujuan menentukan penambahan sukrosa optimum pada pembuatan Nata de Pina dari sari buah nanas dan menyelidiki kelayakan dari produk yang dihasilkan dengan uji organoleptis.Nanas dikupas lalu diblender untuk diambil sari buahnya.Sari buah nanas dididihkan, kemudian ditambahkan sukrosa 2, 4, 6, 8, dan 10 % berat. Kemudian campuran dijadikan pH =5, lalu disterilisasi dalam autoclave. Setelah dingin, larutan dicampur dengan starter.Kemudian media difermentasi selama 8 hari di dalam inkubator pada 30oC. Nata de Pina yang diperoleh dioven selama dua jam pada 110oC, kemudian ditimbang beratnya.Kondisi optimum dicapai pada penambahan sukrosa 6%,denganyield 26,4%. Korelasi yield (y) dan persen sukrosa (x): y = - 0,2632x2 + 4,2736x + 9,474.Uji organoleptis melibatkan fermentasi Nata de Pina dengan penambahan sukrosa 6%. Nata hasil fermentasi dibandingkan teksturnya dengan nata yang ada dipasaran.Dari metode Inverted Beta F Distribution diketahui bahwa Nata de Pina yang diperoleh tidak mempunyai perbedaan dengan Nata yang ada dipasaran. Kata Kunci : Nata de Pina, fermentasi, nanas 

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