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Hasil Pencarian

Ditemukan 10241 dokumen yang sesuai dengan query
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Seader, J.D.
New Jersey: John Wiley & Sons, 2006
660.284 2 SEA s
Buku Teks SO  Universitas Indonesia Library
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Seader, J.D.
New York: John Wiley & Sons, 1998
660.284 2 SEA s
Buku Teks  Universitas Indonesia Library
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King, C. Judson
New Delhi: Tata McGraw-Hill, 1982
660.284 KIN s
Buku Teks SO  Universitas Indonesia Library
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King, C. Judson
New York: McGraw-Hill, 1980
660.284 2 KIN s
Buku Teks SO  Universitas Indonesia Library
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Devina Ismaya
"Kebutuhan akan enzim papain belakangan ini mengalami peningkatan, dengan laju permintaan sebesar 3 – 5 % pertahun. Proses pemisahan enzim papain dari buah pepaya dengan metode ekstraksi padat – cair (leaching) mempergunakan pelarut air dan campuran buffer dalam prosesnya, dalam experimen digunakan berbagai macam variabel operasi untuk mendukung proses ekstraksi ini berjalan dengan maksimal, seperti variasi suhu dan lama waktu pengadukan (345 rpm).
Hasil ekstraksi yang diperoleh kemudian di analisa dengan metode tirosin untuk aktivitas enzim dan metode lowry untuk analisa kadar protein, yang kemudian akan digunakan untuk menghitung berapa aktivitas spesifik tertinggi yang akan diperoleh berdasarkan variasi suhu dan waktu pengadukan.
Berdasarkan hasil penelitian diperoleh nilai aktivitas enzim tertinggi pada perlakuan suhu 70˚C dan waktu pengadukan selama 120 menit sebesar 4,68 EU/mL. Sedangkan untuk aktivitas spesifik enzim sebesar 10.34 EU/mg.

The need for the enzyme papain is greatly increased, its about 3 – 4% /years. The Separation Process of Papain Enzyme from Papaya Fruit by Solid-Liquid Extraction or leaching by using water and solvent mixtures buffer, this process is used in a wide range of operating conditions to support the extraction process such as temperature variations and long stirring.
The results obtained from the extraction are then determine for the enzyme activity by tyrosin method and protein levels by lowry method, and then calculate how the highest specific activity will be retrieved based on variation of temperature and time of stirring.
Based on the research results obtained the value of the highest enzyme activity on the treatment temperature 70˚C and time under stirring for 120 minutes of 4,68 EU/mL. As for the specific enzyme activity of 10.34 EU/mg
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Depok: Fakultas Teknik Universitas Indonesia, 2013
S47695
UI - Skripsi Membership  Universitas Indonesia Library
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Mulyanisa Nadhifah Sirod
"Tembaga berperan penting dalam kehidupan masyarakat modern. Semakin hari kadar tembaga terus menurun, menyebabkan meningkatnya energi per tembaga yang dihasilkan. Tembaga umumnya diproduksi melalui proses hidro- atau piro-metalurgi. Namun baru-baru ini, proses tembaga sinergis berenergi rendah diusulkan. Salah satu prosesnya adalah presipitasi tembaga. Proses hidro-presipitasi digunakan untuk memulihkan tembaga secara selektif. Hasil presipitasi menghasilkan kualitas tembaga yang lebih tinggi dibandingkan dengan standar konsentrat tembaga sulfida yang biasa digunakan dalam proses pirometalurgi. Produk tembaga hasil presipitasi di proses hidrometalurgi dimasukkan ke dalam smelter/converter untuk mengurangi energi dalam produksi tembaga.
Presipitasi tembaga dari larutan sulfat dan bahan pengendapan berbasis kalsium seperti kapur menghasilkan co-kristalisasi gipsum. Adanya gipsum pada produk menyebabkan turunnya kadar presipitat. Namun, gipsum dan produk tembaga mengendap dengan ukuran yang berbeda. Oleh karena itu, pemisahan fisik melalui proses penyaringan mungkin dilakukan untuk menghilangkan gipsum dan meningkatkan kualitas produk tembaga. Efek waktu presipitasi, tingkat penambahan reagen, dan latar belakang larutan selama proses presipitasi diselidiki, untuk menemukan kondisi yang mampu meningkatkan pemisahan fisik antara endapan tembaga dan kristal gipsum.
Hasil menunjukan bahwa kadar tembaga tertinggi 23.3 Cu dihasilkan dengan menggunakan air deionisasi sebagai latar belakang larutan. Akan tetapi, pemisahan optimal dan pemulihan terbaik 31.3 Cu dicapai pada kondisi basis dengan penambahan kapur yang lebih rendah, karena sisa kapur pada system menghambat potensi pemisahan. Dengan itu dapat disimpulkan bahwa, penambahan kapur memberikan pengaruh terbesar pada pemulihan dan pemisahan.

Copper is essential in modern society. The current grade is decreasing, resulting in an increase in energy per copper obtained. Copper is generally produced from hydro or pyro metallurgical process. But recently, a low energy synergistic copper process is proposed. The process involves precipitating copper. A hydro precipitation step is utilised to selectively recover the valuable copper. The precipitate copper provides a higher copper grade compared to standard copper sulphide concentrate used in the pyrometallurgical process. The copper product from a hydrometallurgy process is fed into a smelter converter to reduce the overall energy of copper production.
Copper precipitation from sulphate solutions and calcium based precipitation agent like lime results in co crystallisation of gypsum. This presence of gypsum decreases the grade of precipitates. Gypsum and copper product precipitated at different sizes. Therefore, physical separation processes such as screening may be applied to remove gypsum and improve the copper product grade. Effects of residence time, reagent addition rate, and background solutions during continuous precipitation were investigated to find conditions, which enhance the physical separation between precipitated copper and gypsum crystals.
The results show that the highest copper grade 23.3 Cu was produced using DI water as the background solutions. However, the optimum separation along with the largest product recovery 31.3 Cu was achieved at baseline conditions, when lower lime addition rate was utilised, as the presence of unreacted lime inhibits the potential of separation. Therefore, lime addition rate was discovered to have the greatest influence on recoveries and separation.
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Depok: Fakultas Teknik Universitas Indonesia, 2017
S66920
UI - Skripsi Membership  Universitas Indonesia Library
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Sirkar, Kamalesh K.
"Summary:
"Providing chemical engineering undergraduate and graduate students with a basic understanding of how separation of a mixture of molecules, macromolecules or particles is achieved, this textbook is a comprehensive introduction to the engineering science of separation. [bullet] Students learn how to apply their knowledge to determine the separation achieved in a given device or process. [bullet] Real-world examples are taken from biotechnology, chemical, food, petrochemical, pharmaceutical and pollution control industries. [bullet] Worked examples, elementary separator designs and chapter-end problems, giving students a practical understanding of separation. The textbook systematically develops different separation processes by considering the forces causing the separation, and how this separation is influenced by the patterns of bulk flow in the separation device. Readers will be able to take this knowledge and apply it to their own future studies and research in separation and purification. Online resources include solutions to the exercises and guidance for computer simulatio"
Cambridge [England]: Cambridge University Press, 2014
541.22 SIR s
Buku Teks SO  Universitas Indonesia Library
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Giddings, J. Calvin
New York : John Wiley & Sons, 1991
543.8 GID u
Buku Teks SO  Universitas Indonesia Library
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Hongkong: Marcell Dekker, 1992
660.284 2 SEP
Buku Teks SO  Universitas Indonesia Library
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Matsuura, Takeshi
Boca Raton: CRC Press, 1994
660.284 2 MAT s
Buku Teks SO  Universitas Indonesia Library
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