Design and modeling of optimal distillation sequence for recovery of valuable components from a waste photoresist stripper |
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Authors: | Yus Donald Chaniago Jae-Kyeong Kim Myung-Jun Park Kee-Kahb Koo Moonyong Lee |
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Institution: | 1.School of Chemical Engineering,Yeungnam University,Gyeongsan,Korea;2.Department of Chemical and Biomolecular Engineering,Sogang University,Seoul,Korea;3.Korex Corporation,Anyang,Korea |
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Abstract: | Currently, waste photoresist stripper from the semiconductor industries is generally incinerated at high temperatures or processed as a high-calorie fuel, which can have adverse effects on the environment and economy. Recovery of valuable solvents from waste photoresist strippers is, therefore, very important for thin flat transistor-liquid crystal display (TFT-LCD) manufactures to reduce the production costs and protect the environment against industrial waste. In the present work, systematic laboratory-scale distillation experiments were carried out to regenerate the organic solvents from the waste photoresist stripper and determine if they are feasible to recycle for commercial TFT-LCD grade chemicals: in particular, 1-hydroxyethylpiperazine and methyl diglycol were mainly tried to retrieve. Based on the experiment results, possible alternative distillation sequences were examined through intensive techno-economic analysis using a rigorous process simulator. As a result, an optimal distillation sequence and condition were drawn to separate valuable organic solvents from waste photoresist stripper for a commercial purpose recovery process. |
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