旋轉填充床中氫氧化鈉甘油水溶液吸收二氧化碳

Carbon Dioxide Absorption to Sodium Hydroxide Glycerol Solution by a Rotating Packed Bed

李德威(De-Wei Lee)

指導教授 ： 劉懷勝

國立臺灣大學/工學院/化學工程學研究所/碩士(2016年)

https://doi.org/10.6342/NTU201601757

摘要

旋轉填充床為程序強化的重要項目之一，其利用離心力代替重力場強化氣、液、固間的分離程序，使系統操作範圍變廣，且達到提升質傳效率百倍甚至千倍的效果。本研究利用旋轉填充床進行氫氧化鈉甘油水溶液化學吸收二氧化碳實驗，以研究在化學吸收中加入非水溶劑的效果；文中探討氣液流量、轉速、氫氧化鈉濃度以及甘油濃度等變數對吸收百分比、表徵總括氣膜質傳係數以及增強因子之影響。

實驗結果顯示，吸收百分比、表徵總括氣膜質傳係數以及增強因子隨轉速、液體流量以及氫氧化鈉濃度上升而上升，但隨著氣體流量增加而下降；另外，在氫氧化鈉水溶液中加入適量(5到13 wt%)甘油，能夠使吸收百分比、表徵總括氣膜質傳係數以及增強因子上升，化學吸收的效果比氫氧化鈉水溶液更佳，且最高能夠使吸收百分比上升20%左右。

而最後綜合本研究結果、本實驗室及公開文獻資料提出一結合化學吸收及物理氣提/吸收實驗之迴歸式如下：

(K_G a)/(D_G a_t^2 ) (1-1.1 V_o/V_t )=0.006〖Re〗_G^0.1 〖Re〗_L^0.4 〖Gr〗_G^0.3 H_y^(-0.4) (1+C_NaOH )^3 (a_t/(a_p^' ))^0.3

關鍵字

旋轉填充床 ； 氣膜質傳係數 ； 吸收百分比 ； 化學吸收 ； 甘油 ； 二氧化碳

並列摘要

Rotating packed bed (RPB) plays an important role in process intensification. The RPB substitutes the centrifugal force for gravitational force to enhance separation process. With the help of the centrifugal force, RPB can provide a wider operating range and better mass transfer efficiency. The absorption of carbon dioxide to sodium hydroxide glycerol/water solution in RPB was investigated. The gas and liquid flow rate, rotating speed, the concentration of sodium hydroxide, and glycerol weight percent were taken into consideration as operating variables to study the influence on absorption fraction, apparent overall volumetric mass transfer coefficient, and enhancement factor.

According to experiment results, as the rotating speed, liquid flow rate, and the concentration of sodium hydroxide increased, absorption fraction, apparent overall volumetric mass transfer coefficient, and enhancement factor all increased. But these results were all decreased as gas flow rate increased. Moreover, adding 5 to 13 weight percent glycerol in sodium hydroxide solution could promote chemical absorption efficiency and raised absorption fraction at least 20% higher than sodium hydroxide aqueous solution.

In this research, a correlation being applicable for chemical absorption and physical stripping/absorption is presented as:

(K_G a)/(D_G a_t^2 ) (1-1.1 V_o/V_t )=0.006〖Re〗_G^0.1 〖Re〗_L^0.4 〖Gr〗_G^0.3 H_y^(-0.4) (1+C_NaOH )^3 (a_t/(a_p^' ))^0.3

並列關鍵字

rotating packed bed ； gas-side mass transfer coefficient ； absorption fraction ； chemical absorption ； glycerol ； carbon dioxide

參考文獻

Chen, J. F., Shao, L., Zhang, C. G., Chen, J. M., & Chu, G. G. (2003). Preparation of TiO2 nanoparticles by a rotating packed bed reactor. Journal of Materials Science Letters, 22(6), 437-439.

Lin, C. C., Chen, Y. S., & Liu, H. S. (2004). Adsorption of dodecane from water in a rotating packed bed. Journal of the Chinese Institute of Chemical Engineers, 35(5), 531-538.

Aroonwilas, A., & Tontiwachwuthikul, P. (1997). High-efficiency structured packing for CO2 separation using 2-amino-2-methyl-1-propanol (AMP). Separation and Purification Technology, 12(1), 67-79.

Aroonwilas, A., & Tontiwachwuthikul, P. (1998). Mass Transfer Coefficients and Correlation for CO2 Absorption into 2-Amino-2-methyl-1-propanol (AMP) Using Structured Packing. Industrial & Engineering Chemistry Research, 37(2), 569-575.

Aroonwilas, A., Veawab, A., & Tontiwachwuthikul, P. (1999). Behavior of the Mass-Transfer Coefficient of Structured Packings in CO2 Absorbers with Chemical Reactions. Industrial & Engineering Chemistry Research, 38(5), 2044-2050.