Investigation of the Mass Transfer Parameters of Caffeine Extraction in a Packed Column

Mehmet BİLGİN; İ. Metin HASDEMİR; Ahmet AYDIN; Umur DRAMUR

Article Details

Investigation of the Mass Transfer Parameters of Caffeine Extraction in a Packed Column

Authors:

Mehmet BİLGİN | İ. Metin HASDEMİR | Ahmet AYDIN | Umur DRAMUR

Publisher:

TUBITAK

Journal:

Turkish Journal of Engineering and Environmental Sciences 1998 Vol.22 Issue 6, pp.471-478

Document Type:

Article

Publication Date:

5/1998

Document Language:

Turkish

Document ID (Org No.):

2000745367

Frequency:

Tri-annual

eISSN:

1303-6157

pISSN:

1300-0160

Abstract:

 

In this study, the mass transfer parameters were  investigated in the liquid extraction process, which is the main step  of producing caffeine from tea residue, in a packed brosilicate glass  column, 5.86 cm in diameter, 132 cm in height, filled by 10x10 mm  glass Raschig rings.  Because chloroform was used as a solvent in the  extraction process, the equilibrium distribution of the  water-caffeine-chloroform ternary system were determined at room  temperature.  By using various solvent/raffinate (S/R) volumetric feed  ratios and employing phase reversal in the column, the mass transfer  coefficients, the number of transfer units, the height of transfer  units, the number of theoretical stages and the height equivalents to  a theoretical stage were calculated and thus the most suitable S/R  value was determined.  The number of theoretical stages were found  with the equations proposed by Treybal, Planowski and Alders, and the  stages were compared with each other.  The optimum mass transfer  parameters were reached when the S/R ratio was 0.933 and chloroform  was used as the continuous medium.

 

In this study, the mass transfer parameters were  investigated in the liquid extraction process, which is the main step  of producing caffeine from tea residue, in a packed brosilicate glass  column, 5.86 cm in diameter, 132 cm in height, filled by 10x10 mm  glass Raschig rings.  Because chloroform was used as a solvent in the  extraction process, the equilibrium distribution of the  water-caffeine-chloroform ternary system were determined at room  temperature.  By using various solvent/raffinate (S/R) volumetric feed  ratios and employing phase reversal in the column, the mass transfer  coefficients, the number of transfer units, the height of transfer  units, the number of theoretical stages and the height equivalents to  a theoretical stage were calculated and thus the most suitable S/R  value was determined.  The number of theoretical stages were found  with the equations proposed by Treybal, Planowski and Alders, and the  stages were compared with each other.  The optimum mass transfer  parameters were reached when the S/R ratio was 0.933 and chloroform  was used as the continuous medium.

Article Details

Investigation of the Mass Transfer Parameters of Caffeine Extraction in a Packed Column

Authors: Mehmet BİLGİN | İ. Metin HASDEMİR | Ahmet AYDIN | Umur DRAMUR

Publisher: TUBITAK

Journal: Turkish Journal of Engineering and Environmental Sciences 1998 Vol.22 Issue 6, pp.471-478

Document Type: Article

Publication Date: 5/1998

Document Language: Turkish

Document ID (Org No.): 2000745367

Frequency: Tri-annual

eISSN: 1303-6157

pISSN: 1300-0160

Issues

Authors:

Mehmet BİLGİN | İ. Metin HASDEMİR | Ahmet AYDIN | Umur DRAMUR

Publisher:

TUBITAK

Journal:

Turkish Journal of Engineering and Environmental Sciences 1998 Vol.22 Issue 6, pp.471-478

Document Type:

Article

Publication Date:

5/1998

Document Language:

Turkish

Document ID (Org No.):

2000745367

Frequency:

Tri-annual

eISSN:

1303-6157

pISSN:

1300-0160