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Sodium metaborate

About: Sodium metaborate is a research topic. Over the lifetime, 366 publications have been published within this topic receiving 4361 citations. The topic is also known as: NaBO2 & Sodium borate.


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Journal ArticleDOI
TL;DR: In this article, the vaporization of lithium and sodium metaborate has been studied mass spectrometrically and the second-law heat of the two metaborates and boron oxide was determined with an effusion cell designed to give reliable second−law heats.
Abstract: The vaporization of lithium and sodium metaborate has been studied mass spectrometrically. The vapors of these compounds consist principally of the monomers LiBO2 and NaBO2, with some dimer and a very small amount of trimer also present. Heats of vaporization of the two metaborates and of boron oxide were determined with an effusion cell designed to give reliable second‐law heats. The values obtained are: B2O3(l)=B2O3(g)ΔHv,1300=93.6±3 kcal mole−1LiBO2(c)=LiBO2(g)ΔHs,1060=79±3 kcal mole−1LiBO2(l)=LiBO2(g)ΔHv,1160=70±3 kcal mole−12 LiBO2(g)=Li2(BO2)2(g)ΔH1120=−67±3 kcal mole−1NaBO2(c)=NaBO2(g)ΔHs,1070=73±3 kcal mole−12 NaBO2(g)=Na2(BO2)2(g)ΔH1070=−53±3 kcal mole−1.The composition and the dimerization energies of the metaborate vapors thus resemble those of the alkali halides, hydroxides, and cyanides.

49 citations

Journal ArticleDOI
TL;DR: Zhang et al. as mentioned in this paper investigated the mechanism of alkali flooding for heavy oil recovery, which has strong chelating capacity for calcium and magnesium ions, and evaluated its displacement efficiency using sandpacks.

48 citations

Journal ArticleDOI
TL;DR: In this article, an electrochemical method for recycling sodium metaborate ( NaBO 2 ) to sodium borohydride ( NaBH 4 ) was investigated, where cyclic voltammetry and chronoamperometry were used to evaluate the formation of borax hydrate.

47 citations

Journal ArticleDOI
TL;DR: In this article, the Coats-Redfern method was applied to analyze the TG data for calculation of activation energies (Ea) and preexponential factors (ko) for different heating rates.
Abstract: Sodium metaborate tetrahydrate (NaB(OH)4·2H2O) was synthesized by reaction of anhydrous borax (Na2O·2B2O3) with sodium hydroxide (NaOH) under conditions at 90 °C for 150 min. The structure was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Scanning electron microscope (SEM) and Thermogravimetric (TG) analyses. Moreover, dehydration kinetics of NaB(OH)4·2H2O was carried out under non-isothermal conditions and the Coats-Redfern method was applied to analyze the TG data for calculation of activation energies (Ea) and pre-exponential factors (ko) for different heating rates. It was determined that dehydration of sodium metaborate tetrahydrate occurred in five steps. According to the Coats-Redfern non-isothermal model, Ea and ko were calculated as 50.89 kJ/mol and 26×104 min−1 for region I, 18.51 kJ/mol and 0.87×103 min−1 for region II, 15.72 kJ/mol and 0.52×103 min−1 for region III, 4.37 kJ/mol and 0.04×103 min−1 for region IV and 37.42 kJ/mol and 8.56×103 min−1 for region V, respectively.

45 citations

Patent
11 Jul 2003
TL;DR: In this paper, the discharged fuel solution remaining after the generation of hydrogen gas from a chemical reaction of a fuel is processed, which substantially reduces the liquid content of discharged fuel thereby substantially reducing both its weight and volume.
Abstract: The discharged fuel solution remaining after the generation of hydrogen gas from a chemical reaction of a fuel is processed. This processing substantially reduces the liquid content of the discharged fuel thereby substantially reducing both its weight and volume. Such weight and volume reduction provides a corresponding decrease in the costs of storing and transporting the discharged fuel. This technique can be used with virtually any system that generates hydrogen via a hydrolysis process. In the disclosed embodiment, the fuel for generating hydrogen is sodium borohydride and the discharged fuel in the form of a solution or slurry of sodium metaborate is spray dried into a sodium metaborate powder. Advantageously, the present invention may be used with any of a number of techniques that accelerate the process of evaporation.

45 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20214
202012
20197
201817
201725
201618