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Tjatoer Welasih
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT

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KAJIAN PERAN BAHAN PEMUTIH NATRIUM PIROPOSPHATE (Na2H2P2O7) TERHADAP PROSES PEMBUATAN TEPUNG UBI JALAR Welasih, Tjatoer; Hapsari, Nur
REKAPANGAN Vol 5, No 1 (2011): REKAPANGAN
Publisher : UPN VETERAN JAWA TIMUR

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Abstract

The  study  aims  to  determine  the  effect  of  bleaching  on  sweet  potato  flour.  The specified condition  is  weight  300  g  sweet  potato,  with  white  colour and Piroposphate Sodium  (Na2H2P2O7) concentration:  0;    0.3;  0.6;   0.9;  1.2  g  And  soaking  time:  5;  10; 15; 20; 25 minutes. The results obtained  the best degrees of color at concentration of 1.2 g with 25-minute immersion time of 30 TCU, the lowest obtained at concentrations of  0  g  0  minutes  by  long  immersion  in  the  amount  of  5.0  TCU.  To  obtain  the  best conditions  of  water  content  at  a  concentration  of  1.2  grams  with  a  long  soaking  25 minutes  in  the  amount  of  11.78%,  the  lowest  obtained  at  concentrations  of  0  g  0 minutes by long immersion in the amount of 7.8%. For  the largest starch content was obtained  at  a  concentration  of  0.6  g  with  25-minute  long  immersion  in  the amount  of 28.54%, the lowest obtained at concentrations of 0 g to 25 minutes long immersion in the amount of 26.66%.Keywords: Sodium Piroposphate, flour, sweet potatoes, bulbs, bleach
PEMBUATAN VIRGIN COCONUT OIL (VCO) DENGAN METODE SENTRIFUGASI Hapsari, Nur; Welasih, Tjatoer
REKAPANGAN Vol 4, No 2 (2010): REKAPANGAN
Publisher : UPN VETERAN JAWA TIMUR

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Abstract

Virgin Coconut Oil (VCO) is the oil produced from fresh coconuts. Unlike the ordinary coconut  oil,  Virgin  Coconut  Oil  (VCO)  is  produced  not  by the  addition  of  chemicals  or processes  that  use  high  heat.  Virgin  Coconut  Oil  (VCO)  beneficial  to  health,  this  is  because Virgin Coconut Oil (VCO) contains many medium chain fatty acids (Medium Chain Fatty Acid /  MCFA).  MCFA  are  most  in  the  Virgin  Coconut Oil  (VCO)  is  Lauric  acid  (Lauric  Acid). Properties  that  is  easily  absorbed  MCFA  will  increase  metabolism.  The  addition  of  energy produced  by  the  metabolism  of  this  produces  stimulating  effects  in  the  human  body  thereby increasing the level of energy produced.  Core  processes  in  the  manufacture  of  Virgin  Coconut  Oil  (VCO)  is  located  on  the separation of oil from water and protein. Many obstacles must be faced for separating oil from water  and  proteins,  such  as  in  the  fermentation  process,  the  separation  process takes  a  long time to get the Virgin Coconut Oil (VCO). While the centrifugation, the separation is done by utilizing the weight of the lighter oil. Although I do not require centrifugation long time but the way it has in the purity of the product constraints.  This research was conducted by using coconut cream from coconut milk is silenced for 3  hours.  Then  the  cream  is  incorporated  into  the  instrument  with  speed  centrifuges  spin 600,700,800,900 and 1000 rpm with vaiasion  times very; 30, 45, 60.75 and 90 minutes after that  coconut  cream  layer  divided  into  3  layers  of  oil  that  is,  the  middle  layer  of  protein (blondo)  and  next  underwater  layer  silenced  for  8,10,12,14,  and  16  hours  .  The  results  of virgin  coconut  oil  (VCO)  is  obtained  and  then  analyzed  with  the  parameters  water  content, protein content, Lauric acid, color and odor.  From the research, obtained the best conditions of rotational speed centrifuges at 1000 rpm and centrifuges turnaround time 90 minutes and 8 hours stagnand time with the quality of Virgin  Coconut  Oil  (VCO)  which  produced  yield:  Lauric  acid  yield  of  36.67%  and  52.23% results.Keywords: sentrifuge, coconut cream,,% yield results, VCO
PENENTUAN KOEFISIEN PERPINDAHAN MASSA LIQUID SOLID DALAM KOLOM PACKED BED DENGAN METODE ADSORPSI Welasih, Tjatoer
Jurnal Teknik Kimia Vol 1, No 01 (2006): JURNAL TEKNIK KIMIA
Publisher : Program Studi Teknik Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/jurnal_tekkim.v1i01.14

Abstract

Proses perpindahan massa sangat penting dalam bidang ilmu pengetahuan teknik. Perpindahan massa terjadi pada komponen dalam campuran berpindah dalam fase yang sama atau dari fase satu ke fase yang lain karena adanya perbedaan konsentrasi.Salah satu jenis kolom yang popular adalah Packed Bed yang merupakan suatu silinder panjang, biasanya berdiri tegak dan berisi “packing” yang diam di dalamnya. Karena penggunannya yang sangat luas, maka diperlukan lebih banyak lagi informasi dan study untuk memperkirakan koefisien perpindahan massa dalam kolom “Packed Bed”.Penelitian ini dilakukan dalam sistim Adsorpsi dengan menggunakan karbon aktif lokal sebagai adsorbennya dan larutan Asam benzoat sebagai adsorbatnya, kolom bed dengan diameter 63 mm, dan tinggi partikel 40 cm. Laju alir cairan sebesar 10 ml/s sampai 30 ml/s pada konsentrasi awal yang berbeda-beda antara 0.01 sampai 0.03. Hasil penelitian ini harga konsentrasi keluarga akan semakin kecil dengan semakin naiknya kecepatan liquida dengan konsentrasi awal tetap, sehingga harga koefisien perpindahan massa (kLa) antara 0,03287- 0,03390 s-1 atau semakin besar dengan semakin besarnya kecepatan alir liquida pada konsentrasi awal tetap. The process of mass transfer is very important in the field of technical science. Mass transfer occurs when the component in the mixture moves in the same phase or from one phase to another because of concentration difference.One of the column types which is quite popular is packed bed which shape is silinder like. Usually it can keep on erecting when we put the packing in it. Because the wide use of packed bed, more information and study about the coefficience of mass transfer in the column of packed bed are needed.Research was conducted by implementing the adsorption system with the local active carbon as it’s. A absorber and acid solution of benzoat as its and adsorbat, the packed bed with its diameter 63 mm and the height of particle 40 cm. The dilution rate of different flow is reaching 10 m/s to 30 ml/s with the starting concentration between 0,01 to 0,03.The result of the research showed that the concentration value would become smaller as the liquid rate in creased with constant starting concentration. So that the coefficient value of mass transfer was between 0,03287-0,033905-1 or became greater as the liquid rate was increasing with constant starting concentration.
Co-Authors Nur Hapsari