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Purification of partially degraded diethanolamine solutions Abdi, Majid Abedinzadegan
Abstract
Alkanolamine solutions are widely used in the gas processing industries for the removal of acid gases (e.g. C0₂and H₂S). These solutions frequently become contaminated with amine degradation products, heat stable salts, heavy hydrocarbons and particulates. The contaminants pose serious problems to the sound performance of gas processing plants. Although distillation is the most promising method to separate the contaminants, conventional single-effect flash reclaimers suffer from several problems such as incomplete recovery of amine and low product purity due to the close volatility of amines and certain degradation products. It is shown that these problems can be alleviated by using a novel multi-stage distillation process in which a special inert carrier liquid is employed. The inert liquid ensures proper fluid flows in the distillation column and increases the amine recovery. The desired physical properties of the inert liquid were identified and the liquid was selected accordingly. The vapour-liquid and liquid-liquid equilibrium data for mixtures of diethanolamine, its principal degradation products, water and the inert liquid were investigated. These data are essential to design and simulate the process under various operating conditions. The appropriate thermodynamic models required to represent the equilibrium data were determined and a number of design options, including the conventional singlestage flash process, were evaluated by means of the ASPEN process simulator. Advantages of the new process developed in this study include high amine recoveries and good amine purity. Thermal degradation of amines and potential fouling of heat transfer tubes in conventional amine reclaimers is avoided since the amine mixtures are not passed through the heat exchanger.
Item Metadata
Title |
Purification of partially degraded diethanolamine solutions
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1996
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Description |
Alkanolamine solutions are widely used in the gas processing industries for the removal of acid gases (e.g. C0₂and H₂S). These solutions frequently become contaminated with amine degradation products, heat stable salts, heavy
hydrocarbons and particulates. The contaminants pose serious problems to the
sound performance of gas processing plants. Although distillation is the most
promising method to separate the contaminants, conventional single-effect flash reclaimers suffer from several problems such as incomplete recovery of amine
and low product purity due to the close volatility of amines and certain degradation products. It is shown that these problems can be alleviated by using a novel multi-stage distillation process in which a special inert carrier liquid is employed. The inert liquid ensures proper fluid flows in the distillation column and increases the amine recovery. The desired physical properties of the inert liquid were identified and the liquid was selected accordingly. The vapour-liquid and liquid-liquid equilibrium data for mixtures of diethanolamine, its principal degradation products, water and the inert liquid were investigated. These data are essential to design and simulate the process under various operating conditions. The appropriate
thermodynamic models required to represent the equilibrium data were determined and a number of design options, including the conventional singlestage flash process, were evaluated by means of the ASPEN process simulator. Advantages of the new process developed in this study include high
amine recoveries and good amine purity. Thermal degradation of amines and
potential fouling of heat transfer tubes in conventional amine reclaimers is
avoided since the amine mixtures are not passed through the heat exchanger.
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Extent |
9910520 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-04-07
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0058609
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1997-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.