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Hasil Pencarian

Ditemukan 935 dokumen yang sesuai dengan query
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Kamim Tohari
Abstrak :
Kolom distilasi di atas reaktor ester I untuk memurnikan air dari ethylene glycol (EG) di PT. X adalah tidak efisien karena masih memerlukan proses pemurnian Iagi untuk reaktor yang Iain. Untuk itu diperlukan perancangan awal mengganti kolom distilasi di atas reaktor ester I. Sehingga proses distilasi hanya pada satu kolom yang beroperasi secara kontinyu mengikuti proses produksi poly ethylene terephthalate (PET) dengan demikian proses EG recovery tidak diperlukan lagi.

Perancangan awal kolom distilasi di PT. X menggunakan bantuan chemcad V 5.00. Kolom distilasi di atas reaktor ester I pada program Chemcad V.5.00 tidak ada maka perlu penggabungan beberapa alat tanpa merubah prinsip dasar keija alat, dan bisa digunakan dalam program. Dalam merancang kolom distilasi untuk mengganti kolom distilasi diatas reaktor ester I tanpa merubah kondisi operasi proses produksi PET. Kolom distilasi baru hasil perancangan untuk mernurnikan EG dan air dari reaktor ester I, II dan polikondensasi I.

Kolom distilasi hasil perancangan pada proses pemurnian EG dan air lebih mumi dari pada menggunakan kolom distilasi di atas reaktor ester I, dan kolom distilasi EG recovery. Produk pemurnian kolom distilasi EG pada kolom baru hasil perancangan dengan fraksi mol 0,999285, produk pemurnian distilasi EG diatas reaktor ester I dengan fraksi mol 0,99, produk pemurnian distilasi EG recovery dengan fraksi mol antara 0,985 sampai dengan 0,996.

Hasil perancangan awal kolom distilasi dengan jumlah stage dua belas beroperasi pada tekanan dua bar, temperatur bagian atas kolom l21,1264 °C dan temperatur bagian bawah kolom 221,078°C. Umpan dari real-Ctor ester I masuk kolom distilasi pada stage nomer 10 dan umpan dari reaktor ester II dan poli I masuk pada stage nomer 8, dan total stage adalah 12. Produk bawah kolom distilasi baru hasil perancangan adalah EG dengan laju alir 627,002 Kg/jam fraksi mol EG adalah 0,999285, sedangkan produk atas air dengan laju alir 547,83 Kg/jam fraksi mol air adalah 0,9992 Laju alir refluks adalah 1094,47 Kg/jam,sehingga refluks rasio R/D adalah 2.
Depok: Fakultas Teknik Universitas Indonesia, 2002
S49355
UI - Skripsi Membership  Universitas Indonesia Library
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Syukri S.
Bandung: ITB Press, 1999
540 SYU k
Buku Teks  Universitas Indonesia Library
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Minneapolis: Burgess, 1976
660 CHE
Buku Teks  Universitas Indonesia Library
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Hougen, Olaf A.
New York: John Wiley & Sons, 1943
660 HOU c I
Buku Teks  Universitas Indonesia Library
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Switzerland: Trans Tech, 2011
050 AMR 277 (2011) (1)
Majalah, Jurnal, Buletin  Universitas Indonesia Library
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London: The Biochemical Society,
570 BIOJOU
Majalah, Jurnal, Buletin  Universitas Indonesia Library
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Essen, Germany : Evonik Industries AG, 2015
540 REL 2 2015
Majalah, Jurnal, Buletin  Universitas Indonesia Library
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Vanida Chairgulprasert
Abstrak :
ABSTRAK
Reduction of free fatty acid (FFA) in used palm oil was determined after treatment of waste cooking oil with an adsorbent derived from coffee bean husk ash. Coffee husks were burned at 600 ºC for 12 hrs to obtain the adsorbent ash. Free fatty acid removal efficiency was optimized with respect to ash dosage, contact time and temperature. It was found that shaking ash (1 g) with waste palm oil (50 g) at 250 rpm and 30°C for 330 min gave the highest reduction in free fatty acids (FFA) (1966 mg/g). The adsorption isotherm was followed by Temkin (R2 = 0.9283) and Freundlich models (R2 = 0.9146). The adsorption of FFA at all adsorbent doses followed pseudo-second order kinetics (R2 = 0.9817-0.9999). A thermodynamic study revealed that the changes in enthalpy, entropy and Gibbs free energy were 89.07 kJ/mol, -0.25 kJ/mol.K and -5.15 to -12.17 kJ/mol, respectively. The coffee husk ash (5 g ash / 50 g waste palm oil) was found to reduce FFA by 100% at 30°C. Keywords Coffee husk, Used palm oil, Free fatty acid, Adsorption, Ash
Pathum Thani: Thammasat University, 2018
607 STA 23:3 (2018)
Artikel Jurnal  Universitas Indonesia Library
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Thilahgavani Naggappan
Abstrak :
The volatile chemicals from species of wild Cinnamomum spp. (C. racemosum, C. cuspidatum, C. politum, C. javanicum), Etlingera spp. (E. pyramidosphaera, E. megalocheilos, E. coccinea, E. elatior) and Schizostachyum spp. (S. blumei, S. brachycladum, S. lima, S. pilosum) found in Sabah were investigated. The oils were obtained from the bark, rhizome and culm of respective specimens by hydrodistillation and the profile of volatile chemicals was obtained using Gas Chromatography- Mass Spectrometry (GCMS). Dominance of eucalyptol, terpinen-4-ol and eugenol were consistent among the species from genus Cinnamomum. aromadendrane oxide, lauryl aldehyde, elemicin, borneol and 1-dodecanol were predominant among the species from genus Etlingera. α-elemol, coumaran, guiacol-4-vinyl, palmitic acid and phytol acetate predominate the species from genus Schizostachyum. Strong inhibition against Staphylococcus aureus (MIC: 5.62 ± 0.5 μg mL-1) were exhibited by essential oils of C. cuspidatum and E. coccinea, oil of S. blumei inhibited Listeria monocytogenes (MIC: 4.60 ± 0.5 μg mL-1), oil of C. javanicum inhibited Salmonella typhimurium (MIC: 5.50 ± 0.5 μg mL-1). meanwhile the oil of C. politum suppressed Salmonella enteritidis (MIC: 5.20 ± 0.5 μg mL-1) was measured using microdilution method. these findings reveal the potential of selected plants used by indigenous communities of Borneo as antimicrobials in food, cosmetics and pharmaceutical industries.
Trengganu: UMT, 2017
500 JSSM 12:2 (2017)
Artikel Jurnal  Universitas Indonesia Library
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Thilahgavani Naggappan
Abstrak :
ABSTRAK
The volatile chemicals from species of wild Cinnamomum spp. (C. racemosum, C. cuspidatum, C. politum, C. javanicum), Etlingera spp. (E. pyramidosphaera, E. megalocheilos, E. coccinea, E. elatior) and Schizostachyum spp. (S. blumei, S. brachycladum, S. lima, S. pilosum) found in Sabah were investigated. The oils were obtained from the bark, rhizome and culm of respective specimens by hydrodistillation and the profile of volatile chemicals was obtained using Gas Chromatography- Mass Spectrometry (GCMS). Dominance of eucalyptol, terpinen-4-ol and eugenol were consistent among the species from genus Cinnamomum. aromadendrane oxide, lauryl aldehyde, elemicin, borneol and 1-dodecanol were predominant among the species from genus Etlingera. α-elemol, coumaran, guiacol-4-vinyl, palmitic acid and phytol acetate predominate the species from genus Schizostachyum. Strong inhibition against Staphylococcus aureus (MIC: 5.62 ± 0.5 μg mL-1) were exhibited by essential oils of C. cuspidatum and E. coccinea, oil of S. blumei inhibited Listeria monocytogenes (MIC: 4.60 ± 0.5 μg mL-1), oil of C. javanicum inhibited Salmonella typhimurium (MIC: 5.50 ± 0.5 μg mL-1). meanwhile the oil of C. politum suppressed Salmonella enteritidis (MIC: 5.20 ± 0.5 μg mL-1) was measured using microdilution method. these findings reveal the potential of selected plants used by indigenous communities of Borneo as antimicrobials in food, cosmetics and pharmaceutical industries.
Trengganu: UMT, 2017
500 JSSM 12:2 (2017)
Artikel Jurnal  Universitas Indonesia Library
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