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URN etd-0903112-144702 Statistics This thesis had been viewed 1237 times. Download 3 times. Author Yi-Hsiang Huang Author's Email Address No Public. Department Chemical Engineering Year 2011 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 99 Title Process Design for Recovery of Organics from Petrochemical Effluents by Extraction and Distillation Keyword Organics Distillation Extraction Azeotropic Petrochemical Effluents Petrochemical Effluents Azeotropic Extraction Distillation Organics Abstract The process streams discharged from petrochemical processes often contain high concentrations of organics caused by undesired byproducts. If the byproducts were worthy of reuse, they should not be dumped into wastewater treatment stream directly for both economic and environmental concerns. The costly organics can be separated and purified by traditional unit operation process such as distillation or adsorption technology. However, the recycle-purification process often faced some physical difficulties, such as the azeotropic exist between organic compound and water. In this study, the discharge of effluents containing acetonitrile was used as the model compound for developing a proper process to recycle high purity of acetonitrile that can be used in further process. The process by solvent extraction with dual distillation columns in series and the process by dual distillation columns in series with pressure swimming operation were constructed by commercial chemical process design software. The performance and efficiency were compared and then verified by batch distillation experiments.
The results show that both design algorithms with appropriate design parameters can overcome the problem of azeotrope and achieve recovery of high purity of acetonitrile. Though pressure swing distillation process can get better purity of acetonitrile, the solvent extraction with distillation process were chosen due to due to low energy consumption of distillation and the extraction solvent o-xylene can be 99.9% recovery which indicating that only a small amount of o-xylene refill is needed. Moreover, the recovery ratio of solvent extractive distillation process is only 87.17% which is far below the 99.05% of pressure swing distillation. However, there still exist some problems in the extractive distillation process, such as the existence of the traced o-xylene in all streams. So it also contains trace amounts of o-xylene in acetonitrile product stream that will decrease purity and the industrial or research applications may be affected. Meanwhile, if the compositions of process feed changed, the process design should be re-simulated to adjust the design parameters, such as the reflux ratio, the distillation rate, and the bottom flow rate to maintain the target for high purity of acetonitrile produced.
Advisor Committee Tai-Shang Chen - advisor
Fu-Chang Huang - co-chair
Jia-Ming Chern - co-chair
Files Date of Defense 2012-07-30 Date of Submission 2012-09-04