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Title: Recovery of propylene glycol from dilute aqueous solutions by complexation with organoboronates in ion-pair extractants

Abstract

Recovery of propylene glycol (1,2-PD) from aqueous solution was studied in batch experiments using extractants consisting of ion pairs of Aliquat 336 and phenylboronate in 2-ethylhexanol, toluene, o-xylene, or diisobutyl ketone. The heterogeneous complexation constant {beta}{sub 11} calculated from the results of 25 C was highest in 2-ethylhexanol (49--100 (mol/L){sup {minus}1}). The equilibrium water concentration in the extractants was 8--12 wt% and decreased with increasing uptake of 1,2-PD. Nearly all extractant/diluent systems exhibited stoichiometric overloading. Evidence for aggregation of the ion-pair extractant in the organic phase was found from water solubilization studies and {sup 1}H NMR spectroscopy studies. The complexation constant decreased with increasing temperature. Up to 80% of the extracted 1,2-PD was back extracted into water after acidification with CO{sub 2}. The extractant could then be regenerated by stripping CO{sub 2} from solution at temperatures exceeding 110 C. However, at these temperatures the color of the extractant changes, and the extraction capacity is reduced to about 60% of its original value. Regeneration by contacting with aqueous solutions of Na{sub 2}CO{sub 3} did not cause extractant degradation; regeneration effectiveness increased with increasing pH.

Authors:
; ;  [1]
  1. Lawrence Berkeley Lab., CA (United States). Dept. of Chemical Engineering
Publication Date:
OSTI Identifier:
238037
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Journal Article
Journal Name:
Industrial and Engineering Chemistry Research
Additional Journal Information:
Journal Volume: 35; Journal Issue: 4; Other Information: PBD: Apr 1996
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; GLYCOLS; MATERIALS RECOVERY; EXTRACTION; REGENERATION; CARBON DIOXIDE; FERMENTATION; GLUCOSE

Citation Formats

Broekhuis, R R, Lynn, S, and King, C J. Recovery of propylene glycol from dilute aqueous solutions by complexation with organoboronates in ion-pair extractants. United States: N. p., 1996. Web. doi:10.1021/ie950508o.
Broekhuis, R R, Lynn, S, & King, C J. Recovery of propylene glycol from dilute aqueous solutions by complexation with organoboronates in ion-pair extractants. United States. https://doi.org/10.1021/ie950508o
Broekhuis, R R, Lynn, S, and King, C J. 1996. "Recovery of propylene glycol from dilute aqueous solutions by complexation with organoboronates in ion-pair extractants". United States. https://doi.org/10.1021/ie950508o.
@article{osti_238037,
title = {Recovery of propylene glycol from dilute aqueous solutions by complexation with organoboronates in ion-pair extractants},
author = {Broekhuis, R R and Lynn, S and King, C J},
abstractNote = {Recovery of propylene glycol (1,2-PD) from aqueous solution was studied in batch experiments using extractants consisting of ion pairs of Aliquat 336 and phenylboronate in 2-ethylhexanol, toluene, o-xylene, or diisobutyl ketone. The heterogeneous complexation constant {beta}{sub 11} calculated from the results of 25 C was highest in 2-ethylhexanol (49--100 (mol/L){sup {minus}1}). The equilibrium water concentration in the extractants was 8--12 wt% and decreased with increasing uptake of 1,2-PD. Nearly all extractant/diluent systems exhibited stoichiometric overloading. Evidence for aggregation of the ion-pair extractant in the organic phase was found from water solubilization studies and {sup 1}H NMR spectroscopy studies. The complexation constant decreased with increasing temperature. Up to 80% of the extracted 1,2-PD was back extracted into water after acidification with CO{sub 2}. The extractant could then be regenerated by stripping CO{sub 2} from solution at temperatures exceeding 110 C. However, at these temperatures the color of the extractant changes, and the extraction capacity is reduced to about 60% of its original value. Regeneration by contacting with aqueous solutions of Na{sub 2}CO{sub 3} did not cause extractant degradation; regeneration effectiveness increased with increasing pH.},
doi = {10.1021/ie950508o},
url = {https://www.osti.gov/biblio/238037}, journal = {Industrial and Engineering Chemistry Research},
number = 4,
volume = 35,
place = {United States},
year = {Mon Apr 01 00:00:00 EST 1996},
month = {Mon Apr 01 00:00:00 EST 1996}
}