Low pressure solubilities of CO2 in five fatty amine polyoxyethylene ethers

https://doi.org/10.1016/j.jct.2014.01.013Get rights and content

Highlights

  • The CO2 solubility in five fatty amine polyoxyethylene ethers (FAPEs) has been reported.

  • The experimental data were reduced to Henry’s law constants.

  • The Gibbs free energy, enthalpy and entropy changes were calculated.

  • Relationship between solubility and structure of FAPE was developed.

  • The solubilities of CO2 and thermodynamic properties of dissolution in FAPEs, ILs and other surfactants were compared.

Abstract

The solubilities of CO2 in five fatty amine polyoxyethylene ethers (FAPEs) with different chain lengths were determined over the pressure from P = (100 to 550) kPa and T = (303.15, 313.15 and 323.15) K using isochoric saturation method. Henry’s constants and the thermodynamic properties such as the standard Gibbs free energy, enthalpy, and entropy changes of CO2 solvation were obtained from the correlation of experimental solubility data. It indicates that CO2 solubility increases with increasing oxyethylene (EO) content of the polyoxyethene ether. Henry’s constant based on mole fraction and the molality of CO2 in FAPE-1815 vary from (1.51 to 2.25) MPa and (1.49 to 2.15) MPa from T = (303.15 to 323.15) K, respectively.

Introduction

The increasingly environmental and economic threats posed by global warming and disastrous climate problems due to carbon dioxide (CO2) emissions from fossil fuel combustion have raised public concern worldwide [1]. CO2 capture and storage is becoming a more and more important issue in recent years [2]. Various CO2 capture technologies were investigated, including absorption by alkanolamine, ionic liquids (ILs) as well as their combinations [3], [4], [5], [6], [7], [8], [9], [10], [11], [12], [13]. Although the aqueous alkanolamine systems are highly effective for CO2 removal, the use of them has several inherent drawbacks, such as the intensive energy demand, secondary pollution, corrosion and cost in the operations [14]. ILs are recently reported attractive medium for CO2 capture owing to their features of nonvolatility, thermalstability, and tunable properties [15], but the toxicity, environmental impacts, high viscosity, expensive price and troublesome preparations limit the commercial viability [16]. Therefore, the development of effective, environmentally benign and economic mediums to sequestrate CO2 is highly demanded.

Non-ionic surfactants possess several advantages such as negligible vapor pressure, chemical and thermal stability, inexpensive price, low viscosity and non-toxicity, which are similar to or superior to those of ILs and make them promising candidates for CO2 capture and separation. In addition, due to the great choice in tailoring the structure of amphiphilic polar head and nonpolar tail, the properties of surfactants may be tuned. Generally, surfactants were merely used as modifiers for capture of CO2 [17]. Recently, hydrocarbon surfactants such as TX-45, TX-114, TX-100, Tween 20 and Tween 80 were directly used as solvents for dissolution of CO2 with satisfactory results [18]. In present work, for further research on the dissolution of CO2 in various surfactants, fatty amine polyethylene ethers (FAPEs) were selected as candidates, which consist of hydrophobic alkyl group and hydrophilic oxyethylene (EO) chains with low-cost, high solubility of CO2 and good recycling after simple depressurization or heating. In the literature [19], [20], [21], [22], the structure of EO was considered to be helpful for CO2 absorption. We reported here the solubilities of CO2 in five FAPEs with various EO number at T = (303.15, 313.15 and 323.15) K and P = (100 to 550) kPa. Furthermore, the related thermodynamic property changes accompanying the dissolution were also presented.

Section snippets

Chemicals

The material FAPEs with mass fraction of more than 0.98 were received as a gift from Huayuan chemical company (Jiangsu, China) and dried for 24 h under vacuum at 350 K to remove the volatile impurities. Densities of the FAPEs at atmospheric pressure were carefully determined at T = (303.15, 313.15 and 323.15) K using a 5.567 ± 0.004 cm3 pycnometer (previously calibrated using double distilled water at T = 303.15 K) immersed in an oil-bath. CO2 with the mass fraction of more than 0.99995 was supplied by

Experimental procedure

During the experiment, the temperatures of EC and GR were maintained at target values using two thermostatic water baths with a precision of ±0.05 K. The solubility of CO2 in FAPEs was determined as following: about 50 g pure and dried FAPE was placed in the EC and degassed by vacuum pumping at 340 K while stirring for 1 h. After cooling, the whole system was controlled at specified temperatures with the water-bathes (for example, T1 for EC and T2 for GR) and then evacuated to pressure p1 for 1 h.

Solubility data of CO2 in FAPEs

The solubility data of CO2 in five FAPEs at T = (303.15, 313.15 and 323.15) K were listed in table 2, including mole fraction (x2) and molality (m2) of CO2 in liquid phase as well as gas phase equilibrium pressure (p) above the absorbents.

Because of the negligible vapor pressure of FAPEs, the gas phase composition was regarded to be pure CO2. The amount of CO2 absorbed in FAPEs can be calculated by the following equation,nCO2=n-n1-n2where n and n1 represent the initial and residual amount of CO2

Conclusion

In present paper, the solubility data of CO2 in five FAPEs were determined. Henry’s constants and thermodynamic properties of CO2 in FAPEs were calculated from the experimental data. The results show that the solubilities of CO2 in FAPEs increase with decreasing temperature and increasing pressure. Moreover, FAPEs with higher EO content can enhance solubility of CO2. Present FAPEs possesses almost similar dissolution capacity of CO2 with several imidazolium-based ILs and hydrocarbon

Acknowledgments

The authors are grateful for the financial support by the Natural Science Foundation of Zhejiang Province (No. Y4100699) and the Natural Science Foundation of China (No. 21006095).

References (35)

  • S.K. Dash et al.

    J. Chem. Thermodyn.

    (2012)
  • A. Ahmady et al.

    Chem. Eng. J.

    (2012)
  • H.C. Chen et al.

    Fuel Process. Technol.

    (2011)
  • J. Jacquemin et al.

    J. Chem. Thermodyn.

    (2006)
  • D.S. Deng et al.

    J. Chem. Thermodyn.

    (2013)
  • D. Almantariotis et al.

    Int. J. Greenhouse Gas Control

    (2012)
  • K.A. Kurnia et al.

    J. Chem. Thermodyn.

    (2009)
  • D.M. D’Alessandro et al.

    Angew. Chem. Int. Ed.

    (2010)
  • E.F. da Silva et al.

    Ind. Eng. Chem. Res.

    (2006)
  • N. McCann et al.

    Ind. Eng. Chem. Res.

    (2008)
  • K.E. Gutowski et al.

    J. Am. Chem. Soc.

    (2008)
  • M. Smiglak et al.

    Acc. Chem. Res.

    (2007)
  • J.L. Anderson et al.

    Acc. Chem. Res.

    (2007)
  • B.E. Gurkan et al.

    J. Am. Chem. Soc.

    (2010)
  • F. Zhang et al.

    Chem. Eng. J.

    (2010)
  • M. Hasib-ur-Rahman et al.

    Environ. Sci. Technol.

    (2012)
  • Cited by (15)

    • Selective collection performance of an efficient quartz collector and its response to flotation separation of malachite from quartz

      2021, Minerals Engineering
      Citation Excerpt :

      Laurylamine ethoxylate with fifteen ethoxylate units (LAEO-15) is a commercially available amine-based surfactant, which is usually prepared by the reaction of ethylene oxide and laurylamine (Corbera et al., 2010; Naverro and Sanz, 2001; Schott, 1995). Because it has two hydrophilic polyoxyethyl chains with terminal hydroxyl groups, compared with DA, it and its homologues have excellent physicochemical activity, such as good water solubility (Chen et al., 2014; Schott, 1995), emulsifying and stabilizing properties (Schott, 1995), making their wide application as dispersants, emulsifiers, dying agents, solubilizers, etc. (Deng et al., 2014; Naverro and Sanz, 2001; Schott, 1995). Recent studies have shown that the introduction of polyoxyethyl groups into surfactant molecules reduces its hydrophobicity (Schott, 1995), but is beneficial to improve its flotation selectivity (Li et al., 2019a).

    • Selective collection and differential adsorption of pentaethoxylated laurylamine for the flotation recovery of magnesite from quartz

      2021, Colloids and Surfaces A: Physicochemical and Engineering Aspects
      Citation Excerpt :

      In recent years, PEOLA has often been applied as an emulsifier, solubilizer, dispersant, fabric softener and modifier [14,15]. In addition, PEOLA is easily commercially available and cheap [16], and its use in mineral processing is attracting increasing attention. However, so far, the application of PEOLA for removing quartz from magnesite has not been reported.

    • Solubilities of CO<inf>2</inf> capture absorbents methyl benzoate, ethyl hexanoate and methyl heptanoate

      2018, Journal of Chemical Thermodynamics
      Citation Excerpt :

      There have been various studies [5–26]——either experimental or predictive——carried out on new absorbents. Many studies [9–26] have focused on experimental determinations of the vapor-liquid equilibrium of CO2 and physical absorbents. Miller [9] investigated phase behavior at 298.15 K for the binary systems of CO2 and 15 volatile solvents such as propan-2-one, methyl acetate, N, N-dimethyl acetamide and so on.

    • Below the room temperature measurements of CO<inf>2</inf> solubilities in six physical absorbents

      2018, Journal of Chemical Thermodynamics
      Citation Excerpt :

      Many researchers [5–21] have focused on seeking new physical absorbents with high CO2 absorption capacity, and have studied vapor-liquid equilibrium for CO2 and various physical absorbents. Some of the vapor-liquid equilibrium data are available for temperatures above 293.15 K [5–11]. Li [5] selected five low volatile organic solvents such as gamma-butyrolactone, butyl lactate, 1,1,3,3-tetramethylurea and so on and determined CO2 solubilities at temperatures from 293.15 K to 323.15 K. Miller [6] investigated phase behavior for the binary systems of CO2 and fifteen volatile solvents such as acetone, methyl acetate, N, N-dimethyl acetamide and so on at 298.15 K. CO2 solubilities in five fatty amine polyoxyethylene ethers were reported by Deng [7], at temperatures ranged from 303.15 K to 323.15 K. CO2 solubilities in ethylene glycol methyl ether acetate (EGMEA), propylene glycol methyl ether acetate (PGMEA), 3-methoxy butyl acetate (MBA), diethylene glycol diethyl ether (DGDE), ethylene glycol butyl ether acetate (EGBEA) and carbitol acetate (CA) were determined at temperatures ranging from (293.15 to 313.15) K in our previous works [8,9].

    • Solubility and thermodynamic properties of sulfuryl fluoride in water

      2016, Journal of Chemical Thermodynamics
      Citation Excerpt :

      The stainless steel apparatus is illustrated in figure 1. The details of the experimental method for the measurement of gas solubility were previously presented and are briefly described here [16,17]. The steel stainless apparatus consists of a gas equilibrium cell (EC, 10) with a magnetic stirrer, a gas reservoir (GR, 5) and pressure transmitters (6, 11).

    View all citing articles on Scopus
    View full text