Kinetics of liquid-phase phenol hydrogenation enhanced by membrane dispersion

Liu, Yucheng; Qi, Zaidong; Zhao, Meng; Jiang, Hong; Liu, Yefei; Chen, Rizhi

doi:10.1016/j.ces.2021.117346

Cited by 10 publications

(9 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Once external conditions change, this balance will be broken, and a new balance will be formed. The measurement process of hydrogen solubility employed in this work was reported in our previous work . During measurement of the solubility of hydrogen, the valve of the sample collection tank was opened to release a certain amount of liquid (20–30 g) into the sampling tank, the sample returned to normal pressure, thus breaking the previous gas–liquid balance, and hydrogen dissolved in the liquid phase was released.…”

Section: Methodsmentioning

confidence: 99%

“…The orthogonal method is an efficient means to obtain the optimal reaction conditions, which can significantly improve the efficiency of multifactor experiments. , The main purpose of this work is to optimize the connection pipeline between the membrane module and the fixed-bed reactor on the basis of previous work . The design, implementation, and analysis of the two-factor experiments are relatively simple because of their few factors. , Therefore, the influence of the heights of the connecting pipelines on the reaction performance, bubble behavior, and hydrogen dissolved under different operating conditions in the presence of membrane dispersion was investigated.…”

Section: Methodsmentioning

confidence: 99%

“…The measurement process of hydrogen solubility employed in this work was reported in our previous work. 23 During measurement of the solubility of hydrogen, the valve of the sample collection tank was opened to release a certain amount of liquid (20−30 g) into the sampling tank, the sample returned to normal pressure, thus breaking the previous gas−liquid balance, and hydrogen dissolved in the liquid phase was released. The increase in the amount of gas in the sample tank further led to an increase in pressure in the sealed sample tank.…”

Section: Measurement and Calculation Of The Hydrogen Solubilitymentioning

confidence: 99%

“…12 Furthermore, a macrokinetic model of phenol hydrogenation enhanced by membrane dispersion was established, especially considering the influence of the membrane structure parameters, which provides a theoretical basis for the design and scale-up of membrane distribution and control of the hydrogenation reaction. 23 Although the conversion of phenol and the selectivity of cyclohexanone were improved in the fixed-bed reactor with a membrane distributor, phenol conversion was still lower than that in the stirred tank reactors (∼100%). The transformation of phenol is affected by the content of hydrogen dissolved in a phenol aqueous solution, 24 which is closely related to the characteristics of the bubbles.…”

Section: Introductionmentioning

confidence: 99%

“…Under the conditions of a high space velocity and a low hydrogen–phenol ratio, phenol conversion could reach 85.6%, and the cyclohexanone selectivity was over 98%, which is significantly higher than the one-way yield of 3% of traditional cyclohexane oxidation . Furthermore, a macrokinetic model of phenol hydrogenation enhanced by membrane dispersion was established, especially considering the influence of the membrane structure parameters, which provides a theoretical basis for the design and scale-up of membrane distribution and control of the hydrogenation reaction …”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Liquid-Phase Hydrogenation of Phenol in an Advanced Gas–Liquid Concurrent Upflow Fixed-Bed Reactor with Membrane Dispersion

Liu

Zhu

Jiang

et al. 2022

Ind. Eng. Chem. Res.

Self Cite

View full text Add to dashboard Cite

Phenol hydrogenation is an environmentally friendly route to produce cyclohexanone, an important intermediate for manufacturing nylon-6 and nylon-66. Herein, a gas–liquid cocurrent upflow fixed-bed reactor with an external multichannel ceramic membrane as the dispersion medium was developed for continuous liquid-phase hydrogenation of phenol to cyclohexanone over Pd/Al2O3 catalysts in aqueous media. The pipeline between the membrane module and fixed-bed reactor was designed and optimized after examination of the influence of the bubble size and solubility of hydrogen quasi in situ and the corresponding phenol conversion and cyclohexanone selectivity. Results highlight that only a suitable pipe height can effectively improve the gas–liquid mass transfer, so as to improve the phenol conversion. A phenol conversion of ∼98% and a cyclohexanone selectivity of ∼95% can be achieved in a 52 h continuous run. In particular, the phenol conversion is significantly increased by 14.5% compared with that without a pipeline connection. This work will pave an efficient route to the optimal design of a fixed-bed reactor coupled with a membrane distributor for green cyclohexanone production.

show abstract

Section: Methodsmentioning

confidence: 99%