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Simulation of the condensate treatment process in a Kraft pulp mill

Olsson, J and Zacchi, Guido LU (2001) In Chemical Engineering & Technology 24(2). p.195-203
Abstract
A simulation program has been developed and used to study the condensate treatment process in a kraft pulp mill consisting of a stripper, a methanol column and a decanter. The simulations require rigorous models for vapor-liquid and liquid-liquid equilibrium calculations. The Wilson equation and the NRTL equation (non random two liquids) have been used for these calculations New data were included in the flowsheeting program Aspen Plus for seven volatile compounds, to perform accurate calculations of both vapor-liquid and liquid-liquid equilibria. Simulations were compared with measurements on the industrial condensate treatment process and the results of the simulations were used to improve the process. By changing the position of the... (More)
A simulation program has been developed and used to study the condensate treatment process in a kraft pulp mill consisting of a stripper, a methanol column and a decanter. The simulations require rigorous models for vapor-liquid and liquid-liquid equilibrium calculations. The Wilson equation and the NRTL equation (non random two liquids) have been used for these calculations New data were included in the flowsheeting program Aspen Plus for seven volatile compounds, to perform accurate calculations of both vapor-liquid and liquid-liquid equilibria. Simulations were compared with measurements on the industrial condensate treatment process and the results of the simulations were used to improve the process. By changing the position of the decanter in the process, the COD (chemical oxygen demand) content in the stripped condensate was decreased from 700 to 300 mg O-2/l. The effect of various process parameters, such as the vapor fraction after the stripper and the flow rate of secondary steam to both the stripper and the methanol column, on the quality of clean condensate were investigated. The design of the stripper and the methanol column was studied by calculating the optimal feed location for various numbers of trays in the columns. The results showed that the feed location in the methanol column would be more optimal if it were located higher up in the column (above tray 5-7) instead of above tray 10, which was the case in the industrial process investigated. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Chemical Engineering & Technology
volume
24
issue
2
pages
195 - 203
publisher
John Wiley & Sons
external identifiers
  • wos:000167009500027
  • scopus:0035059395
ISSN
1521-4125
DOI
10.1002/1521-4125(200102)24:2<195::AID-CEAT195>3.0.CO;2-0
language
English
LU publication?
yes
id
cfc28f9c-6367-490d-82b7-ac6340f5d12e (old id 3911316)
date added to LUP
2013-07-01 08:25:32
date last changed
2018-01-07 06:17:38
@article{cfc28f9c-6367-490d-82b7-ac6340f5d12e,
  abstract     = {A simulation program has been developed and used to study the condensate treatment process in a kraft pulp mill consisting of a stripper, a methanol column and a decanter. The simulations require rigorous models for vapor-liquid and liquid-liquid equilibrium calculations. The Wilson equation and the NRTL equation (non random two liquids) have been used for these calculations New data were included in the flowsheeting program Aspen Plus for seven volatile compounds, to perform accurate calculations of both vapor-liquid and liquid-liquid equilibria. Simulations were compared with measurements on the industrial condensate treatment process and the results of the simulations were used to improve the process. By changing the position of the decanter in the process, the COD (chemical oxygen demand) content in the stripped condensate was decreased from 700 to 300 mg O-2/l. The effect of various process parameters, such as the vapor fraction after the stripper and the flow rate of secondary steam to both the stripper and the methanol column, on the quality of clean condensate were investigated. The design of the stripper and the methanol column was studied by calculating the optimal feed location for various numbers of trays in the columns. The results showed that the feed location in the methanol column would be more optimal if it were located higher up in the column (above tray 5-7) instead of above tray 10, which was the case in the industrial process investigated.},
  author       = {Olsson, J and Zacchi, Guido},
  issn         = {1521-4125},
  language     = {eng},
  number       = {2},
  pages        = {195--203},
  publisher    = {John Wiley & Sons},
  series       = {Chemical Engineering & Technology},
  title        = {Simulation of the condensate treatment process in a Kraft pulp mill},
  url          = {http://dx.doi.org/10.1002/1521-4125(200102)24:2<195::AID-CEAT195>3.0.CO;2-0},
  volume       = {24},
  year         = {2001},
}