Extraction of boric acid with aliphatic 1,3-diols and other chelating agents

Egneus, Birgitta; Uppström, Leif R.

doi:10.1016/s0003-2670(01)82533-2

Cited by 34 publications

(12 citation statements)

References 18 publications

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“…In one of these investigations, 1.1-2.0 M boric acid solutions which pH is adjusted to 2 have been extracted by 1,3-diols and the best yield has been taken by benzylic substituted 1,3-butanol [9]. In another study, boron removal has been investigated by the reactivated containing various functional groups and the extractants have been classified [10]. Both activated carbon and activated carbon impregnated with various compounds have been used in boric acid and borax removal from wastewaters.…”

Section: Introductionmentioning

confidence: 99%

Boron removal from aqueous solutions by activated carbon impregnated with salicylic acid

Çelik

Can

Kocakerìm

2008

Journal of Hazardous Materials

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Section: Introductionmentioning

confidence: 99%

Boron removal from aqueous solutions by activated carbon impregnated with salicylic acid

Çelik

Can

Kocakerìm

2008

Journal of Hazardous Materials

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“…The most appropriate method is separation by a boron specific resin. This is an anion exchanger with adjacent OH groups forming ester chelates with boric acid in weakly acidic, neutral and alkaline solutions [10][11][12][13][14]. The boron chelate can be decomposed by strong acids but is not influenced by high salinities of the sample [10], which is important for separations from sewage and ocean water.…”

Section: Methodsmentioning

confidence: 99%

Determination of boron isotopic variations in aquatic systems with negative thermal ionization mass spectrometry as a tracer for anthropogenic influences

Eisenhut

Heumann

Vengosh

1996

Analytical and Bioanalytical Chemistry

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A technique for precise boron isotope ratio measurements with a high detection power has been developed by negative thermal ionization mass spectrometry (NTIMS). Relative standard deviations in the range of 0.03-0.3% have been obtained for the determination of the (11)B/(10)B isotope ratio using nanogram amounts of boron. Ba(OH)(2) has been applied as ionization promoter for the formation of negative thermal ions. By adding MgCl(2) better reproducibilities of the measurement have been achieved. A possible interference of BO(-)(2) ions at mass number 42 by CNO(-) could be excluded by the sample preparation technique used. Contrary to other NTI techniques no dependence of the measured isotope ratio on the boron amount used has been observed. Anthropogenic and natural saline influences in ground water have been successfully identified by boron isotope ratio determinations with this NTIMS method, due to the different isotopic composition of boron in natural and anthropogenic substances. In sewage, the boron isotope ratio is substantially influenced by washing powder, which contains low (11)B/(10)B ratios (expressed in delta(11)B values normalized to the standard reference material NIST SRM 951). In contaminated ground water, low delta(11)B values are normally correlated with high boron and high chloride concentrations. On the other hand, delta(11)B shifts to higher values in less contaminated samples. For ground water with saline influences, only the delta(11)B determination, and not the boron or chloride content, allowed the correct identification of this natural source of contamination.

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“…This was explained in detail in our previous report comparing the extraction performance of TMPD with that of 2-ethyl-1,3-hexanediol . These two were extractants whose particularly high efficiencies were identified in a classical article . Moreover, flow-type reactors can be employed effectively for this purpose.…”

Section: Introductionmentioning

confidence: 94%

“…15 These two were extractants whose particularly high efficiencies were identified in a classical article. 20 Moreover, flow-type reactors can be employed effectively for this purpose. To propose a well-designed and feasible process, it is necessary that the reaction mechanism between B (dissolving B exists as boric acid, B(OH) 3 ) and the extractant, TMPD, is well understood.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic and Computational Analyses of Liquid–Liquid Interfacial Reaction Mechanism of Boric Acid Esterification with 2,2,4-Trimethyl-1,3-pentanediol in Boron Extraction Processes

Kunimoto

Bothe

Tamura³

et al. 2018

J. Phys. Chem. C

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Purification of silica solution to chemically remove impurities is a novel approach for preparing solar-grade Si. Complete elimination of boron is necessary, as it significantly affects the semiconductor properties of Si if included. To build an efficient reactor for boron extraction, the mechanism of extraction reaction based on molecular behavior should be well understood. Here, we investigated the liquid−liquid extraction of boron (boric-acid) using 2,2,4-trimethyl-1,3-pentanediol as an extractant, which takes place at the liquid−liquid interface experimentally and theoretically. Raman spectroscopy for the microflow reactor provided the concentration of boric acid after extraction, whereas density functional theory calculation showed the reaction energy profiles of the underlying chemical reactions. Calculation results suggested that H 2 O molecules from the aqueous phase promote extraction by enabling the formation of [BOH-HOH-HOC], a sufficiently stable, nonsteric structure, which stabilizes the transition state and facilitates boric acid esterification. Otherwise, this reaction cannot take place in standard conditions. Raman spectroscopy applied to the extraction process in a microflow reactor supported this conclusion experimentally. These results suggest that the extraction reaction at the liquid−liquid interface is mass transfer-limited. This can help the design of effective reactors to eliminate boron impurity from silica solution.

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Extraction of boric acid with aliphatic 1,3-diols and other chelating agents

Cited by 34 publications

References 18 publications

Boron removal from aqueous solutions by activated carbon impregnated with salicylic acid

Boron removal from aqueous solutions by activated carbon impregnated with salicylic acid

Determination of boron isotopic variations in aquatic systems with negative thermal ionization mass spectrometry as a tracer for anthropogenic influences

Spectroscopic and Computational Analyses of Liquid–Liquid Interfacial Reaction Mechanism of Boric Acid Esterification with 2,2,4-Trimethyl-1,3-pentanediol in Boron Extraction Processes

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