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Hydrodynamics study of a fast liquid–liquid oxidation process with in situ gas production in microreactors |
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| Authors: | Saier Liu Guangxiao Li Minjing Shang Zheng-Hong Luo Yuanhai Su |
| Affiliation: | 1. School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai, PR China
Contribution: Data curation, Formal analysis, ?Investigation, Methodology, Validation, Writing - original draft;2. School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai, PR China Contribution: Data curation, Formal analysis, ?Investigation, Writing - original draft;3. School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai, PR China Contribution: Methodology, Project administration, Resources, Supervision;4. School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai, PR China |
| Abstract: | Hydrodynamics characteristics of a fast and highly exothermic liquid–liquid oxidation process with in situ gas production in microreactors were studied using a newly developed experimental method. In the adipic acid synthesis through the K/A oil (the mixture of cyclohexanol and cyclohexanone) oxidation with nitric acid, bubble generation modes were divided into four categories. The gas production became more intensive, unstable, even explosive with increasing the oil phase feed rate and the temperature. A novel automatic image processing method was developed to monitor the instantaneous velocity online by tracking the gas–liquid interface. The axial velocity at the same location was unstable due to the changing gas production rate. Furthermore, the actual residence time was obtained easily with being only 36% of the space–time minimally, beneficial for establishing accurate kinetics and mass transfer models with time participation. Finally, an empirical correlation was developed to predict the actual residence time under different conditions. |
| Keywords: | bubble hydrodynamics in situ gas production microreactor residence time |
