CO2 absorption performance in a rotating disk reactor using DBU-glycerol as solvent

doi:10.1016/j.cjche.2019.03.031

Abstract

Abstract: Gas-liquid mass transfer of rotating disk reactor was studied in CO₂ absorption using 1,8-diazabicyclo-[5.4.0]-undec-7-ene (DBU)-glycerol solution as solvent. Effects of the rotating disk structure and various operation parameters on the CO₂ absorption rate and CO₂ removal efficiency were investigated. The rotating disk with optimal holes is conducive to mass transfer of CO₂ and the formation of thin liquid film at the opening increases the gas-liquid contact area. With the increase of rotating speed, the liquid flow pattern on the rotating disk surface changes from thin film flow to separated streams and creates extra liquid lines attached to the rim of the disk, which leads to a very complicated change on the CO₂ absorption rate and CO₂ removal efficiency. The overall gas-phase mass transfer coefficient increases 138% as the rotating speed increasing from 250 to 1400 r·min^-1. Increasing temperature from 298 to 338 K can enhance the CO₂ absorption rate due to lowering the viscosity of the solvent. The rate-determined step for the absorption is focused on the gas side. The rotating disk reactor can effectively enhance the absorption of CO₂ with viscous DBU-glycerol solvents.

Key words: Gas-liquid flow, Carbon dioxide, Rotating disk reactor, Absorption rate, Viscosity

摘要： Gas-liquid mass transfer of rotating disk reactor was studied in CO₂ absorption using 1,8-diazabicyclo-[5.4.0]-undec-7-ene (DBU)-glycerol solution as solvent. Effects of the rotating disk structure and various operation parameters on the CO₂ absorption rate and CO₂ removal efficiency were investigated. The rotating disk with optimal holes is conducive to mass transfer of CO₂ and the formation of thin liquid film at the opening increases the gas-liquid contact area. With the increase of rotating speed, the liquid flow pattern on the rotating disk surface changes from thin film flow to separated streams and creates extra liquid lines attached to the rim of the disk, which leads to a very complicated change on the CO₂ absorption rate and CO₂ removal efficiency. The overall gas-phase mass transfer coefficient increases 138% as the rotating speed increasing from 250 to 1400 r·min^-1. Increasing temperature from 298 to 338 K can enhance the CO₂ absorption rate due to lowering the viscosity of the solvent. The rate-determined step for the absorption is focused on the gas side. The rotating disk reactor can effectively enhance the absorption of CO₂ with viscous DBU-glycerol solvents.

关键词: Gas-liquid flow, Carbon dioxide, Rotating disk reactor, Absorption rate, Viscosity

Hualing Duan, Kun Zhu, Houfang Lu, Changjun Liu, Kejing Wu, Yingying Liu, Bin Liang. CO₂ absorption performance in a rotating disk reactor using DBU-glycerol as solvent[J]. Chinese Journal of Chemical Engineering, 2020, 28(1): 104-113.

Hualing Duan, Kun Zhu, Houfang Lu, Changjun Liu, Kejing Wu, Yingying Liu, Bin Liang. CO₂ absorption performance in a rotating disk reactor using DBU-glycerol as solvent[J]. 中国化学工程学报, 2020, 28(1): 104-113.

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CO₂ absorption performance in a rotating disk reactor using DBU-glycerol as solvent

CO₂ absorption performance in a rotating disk reactor using DBU-glycerol as solvent

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