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CO2 Solubility in Physicochemical Absorbent: Dibutyl Ether/N-Methylethanolamine/Ethanol

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Abstract

In this work, a physicochemical absorbent was proposed for CO2 capture, which consists of dibutyl ether as physical solvent, N-methylethanolamine (NMEA) as chemical additive, and ethanol as dissolvent. The vapor–liquid equilibrium behavior of this CO2 + physicochemical absorbent system was measured using an isothermal synthetic apparatus. The solubility data of CO2 in ethanol at 313.15 K were measured and compared with literature data to verify the validity of this method. Then, the CO2 solubility data of above system with varying NMEA mass fractions of 15 %, 25 %, and 50 % were, respectively, measured at 298.15 K. It shows that the CO2 solubility increases when NMEA mass fraction goes up. The CO2 solubility data in the absorbent with 25 % NMEA mass fraction were measured at a temperature range from 298.15 K to 328.15 K with the interval of 10 K and at a pressure range from 0 MPa to 3 MPa. The result shows that CO2 turns out to be more soluble in the physicochemical absorbents than in dibutyl ether at the same conditions of temperature and pressure.

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Abbreviations

a :

CO2 solubility (mol·kg−1)

ARD :

Absolute relative deviation

M :

Molecular weight (g·mol−1)

m :

Mass (g)

n :

Number of moles (mol)

T :

Temperature (K)

p :

Pressure (Pa)

R 2 :

Correlation coefficient

w :

Mass fraction

ω :

Acentric factor

δ :

Increase rate

c:

Critical values

corr:

Correlated values

DBE:

Dibutyl ether

EL:

Ethanol

exp:

Experimental values

lit:

Literature values

NMEA:

N-methylethanolamine

TEA:

Triethanolamine

MDEA:

Methyldiethanolamine

PR:

Peng–Robinson

SRK:

Soave–Redlich–Kwong

pc:

Physicochemical solvent

solv:

Solvent

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Acknowledgments

This research was supported by the National Natural Science Foundation of China (Nos. 51741605, 51706146, and 21506124), and Capacity Building Plan for some Non-military Universities and Colleges of Shanghai Scientific Committee (No. 18060502600). This research was also sponsored by Shanghai Sailing Program (No. 19YF1434800).

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Authors and Affiliations

  1. School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China

    Weijia Huang

  2. Hualu Engineering and Technology Co., Ltd, Xi’an, 710065, China

    Xiaojie Du

  3. College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China

    Danxing Zheng & Xianghong Wu

  4. School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, 200093, China

    Yun Li

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  1. Weijia Huang
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  2. Xiaojie Du
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Correspondence to Danxing Zheng.

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Huang, W., Du, X., Zheng, D. et al. CO2 Solubility in Physicochemical Absorbent: Dibutyl Ether/N-Methylethanolamine/Ethanol. Int J Thermophys 40, 43 (2019). https://doi.org/10.1007/s10765-019-2506-4

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