Drying of wet boric acid by microwave heating

Kocakusak, S.; Köroglu, H. J.; Tolun, R.

doi:10.1016/s0255-2701(97)00056-1

Cited by 17 publications

(10 citation statements)

References 3 publications

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“…TGA‐DSC results are shown in Figure . The thermogram shows a first stage from 50 to 150°C that is attributed to water evaporation and volatilization of HReO 4 (liquid) from the surface of the sample, from 163 to 190°C is attributed to dehydration of boric acid (H 3 BO 3 ) to form metaboric acid (HBO 2 ) and from 190 to 350°C is attributed to dehydration HBO 2 to form B 2 O 3 . From 420 to 1100°C due to the decomposition of ReO 3 into ReO 2 and O 2 .…”

Section: Resultsmentioning

confidence: 99%

“…The total weight loss of the residue at 1500°C was 76.6% w/w, the major loss of weight is attributed to ReO 3 material because the ReB 2 is composed of 10.4% w/w of B and 89.6% w/w of Re. From the DSC curve (Figure ), 3 endothermic peaks at low temperature can be seen: water desorption at 110°C, the dehydration of boric acid to form metaboric acid (HBO 2 ) at 163°C and dehydration of HBO 2 to form B 2 O 3 at 194°C . Subsequently, a broad exothermic peak was observed at 420°C; this peak can be associated to the decomposition of ReO 3 into ReO 2 and O 2 .…”

Section: Resultsmentioning

confidence: 99%

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Chemical stability of superhard rhenium diboride at oxygen and moisture ambient environmental conditions prepared by mechanical milling

et al. 2018

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In this study, rhenium diboride (ReB2) was obtained by mechanosynthesis at 640 minutes of milling. The obtained ReB2 was stored at oxygen and moisture ambient environmental conditions to know the chemical stability. The results indicate that ReB2 is totally decomposed at oxygen and moisture ambient environmental conditions. Furthermore, the X‐ray diffraction (XRD) analysis of ReB2 samples after 26 months of storage shows that the final products of degradation are HReO4 (liquid), H3BO3, HBO2, and ReO3. Finally, a schematic diagram of the degradation sequence of ReB2 at oxygen and moisture ambient environmental conditions is proposed and validated with a thermodynamic analysis.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Chemical stability of superhard rhenium diboride at oxygen and moisture ambient environmental conditions prepared by mechanical milling

et al. 2018

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“…22 Eymir and Okur showed that ulexite mineral could be dried using microwave energy. 23 Kocakusak et al studied the microwave dehydration of boric acid in the range of 100-700 W. 24 Ozdogan et al researched the microwave dehydration behavior of the mineral inderite, which has the same chemical formula in a different lattice structure. Inderite has a monoclinic crystal system, whereas kurnakovite has a triclinic crystal system.…”

Section: −23mentioning

confidence: 99%

Dehydration behavior and kinetics of kurnakovite under microwave irradiation

Şenberber¹,

Yıldırım²,

Özdoğan³

et al. 2017

Turk J Chem

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Abstract:In this research, the dehydration behavior of kurnakovite was studied under microwave irradiation. The kinetic parameters of the dehydration reaction were determined using different kinetic models. Kurnakovite was characterized by the techniques of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM) before and after the dehydration process. According to the results, kurnakovite was identified as a compound with the powder diffraction file (pdf) number 00-024-0700 before the dehydration process and after the dehydration process amorphous formations were observed. Moreover, FT-IR results showed that dehydration was completed successfully because of the disappearance in the band values of structural water. The dehydration process was ended at 25, 20, and 15 min for the power levels of 360, 600, and 800 W, respectively. Among the models, the two-term exponential model best fits the drying experimental data. For the activation energy calculation, the Page model best fits the experimental data and was found as 9.92 W × g −1 .

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“…Z toho plyne, že pro uplatnění kyselých vlastností kyseliny borité je nutná přítomnost vody. Za zvýšených teplot (nad 100 °C [5]) kyselina boritá (H 3 BO 3 ) odštěpuje vodu za vzniku kyseliny monohydrogenborité (metaboritá, HBO 2 ), jejíž chemické chování se od H 3 BO 3 takřka neliší. Kyselina monohydrogenboritá okamžitě kondenzuje na cyklickou strukturu H 3 B 3 O 6 [4].…”

Section: úVodunclassified

Koroze konstrukčních materiálů působením kyseliny borité

Kobzová

Kárník

Skoumalová

et al. 2015

Koroze a Ochrana Materialu

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ÚVODVVER typ reaktoru je ruskou verzí PWR reaktorů. Oba typy reaktoru používají kyselinu boritou k moderování toku neutronů v primárním okruhu, a která v případě úniku může způsobit korozi konstrukčních materiálů. Korozní rychlosti konstrukčních ocelí nejsou příliš vysoké, ale zvýšená teplota hraje významnou roli [1]. Jiným efektem zvyšujícím korozní rychlost je vyvěrání, které má za následek rychlý úbytek materiálu. Je nutné brát v úvahu vhodné hodnocení chemie, materiálové složení a mechanické vlastnosti materiálu. Je mnoho prací shrnující tyto poznatky pro materiály používané pro PWR reaktory, ale pro materiály užité pro VVER reaktory stále chybí. Zevrubný přehled korozních rychlostí za statických podmínek byl již publikován [2], ale za podmínek zahrnující dynamické působení bylo publikováno jen minimum informací.Z chemického úhlu pohledu je kyselina boritá velmi slabou kyselinou, jež velmi neochotně odštěpuje proton (pKa = 9.25)

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Drying of wet boric acid by microwave heating

Cited by 17 publications

References 3 publications

Chemical stability of superhard rhenium diboride at oxygen and moisture ambient environmental conditions prepared by mechanical milling

Chemical stability of superhard rhenium diboride at oxygen and moisture ambient environmental conditions prepared by mechanical milling

Dehydration behavior and kinetics of kurnakovite under microwave irradiation

Koroze konstrukčních materiálů působením kyseliny borité

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