Thermometric Quantitative Selective Analysis of Sodium Methoxide in Methanol Industrial Solutions

Bastos, Flavio Adriano; Khan, Sabir; Simões, Eduardo H.; Teixeira, C. A.; Tubino, Matthieu

doi:10.5935/0103-5053.20130160

Journal of the Brazilian Chemical Society

2013

DOI: 10.5935/0103-5053.20130160

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Thermometric Quantitative Selective Analysis of Sodium Methoxide in Methanol Industrial Solutions

Flavio Adriano Bastos¹,

Sabir Khan²,

Eduardo H. Simões³

et al.

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“…It is a very active catalyst offering high yields (>99%) under mild reaction conditions. The sodium methoxide that is employed industrially corresponds to a 30% (w/w %) solution of NaOCH 3 in CH 3 OH. , …”

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confidence: 99%

First Time Determination of Important Catalyst Sodium Methoxide Used in Biodiesel by Colorimetric Method

Khan

Tubino

Vila³

et al. 2018

Anal. Chem.

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A simple and selective spectrophotometric method has been developed for the first time for the determination of sodium methoxide in methanol solution in the presence of sodium hydroxide. The developed method involves the formation of a pink species by the reaction between sodium methoxide and α-santonin. The pink compound formed shows absorbance maximum at 513 nm. N, N-Dimethylformamide and methanol were used as solvents, and the reaction was performed at different temperatures and 25 °C was selected for further experiments. The pink compound formed was dried and then was studied using FTIR and mass spectrometry. The calibration curve was constructed from 0.10 to 0.30% (m/v) sodium methoxide in methanol, and the standard deviation is 0.010%. Similarly, the relative standard deviations of 28%, 26%, and 24% solutions of sodium methoxide were obtained in the range of 0.4 to 1.9%. The correlation coefficient of the analytical curve r = 0.9997; the limit of detection, LOD, is ca. 1.1 × 10 % w/w; and the limit of quantification, LOQ, is ca. 3.2 × 10 % w/w. The results of analysis were validated statistically.

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mentioning

confidence: 99%

First Time Determination of Important Catalyst Sodium Methoxide Used in Biodiesel by Colorimetric Method

Khan

Tubino

Vila³

et al. 2018

Anal. Chem.

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An Under-Appreciated Source of Reproducibility Issues in Cross-Coupling: Solid-State Decomposition of Primary Sodium Alkoxides in Air

et al. 2020

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The decomposition of primary sodium alkoxide salts under ambient storage conditions and the effects of this phenomenon on commonly employed transition-metal-catalyzed cross-coupling reactions are described. By utilizing NMR, IR, and Raman spectroscopy, along with a modified Karl Fischer analysis, the main inorganic degradants were characterized, and CO2 in the air was found to be a critical reactant within the decomposition process. The effects of storage conditions on decomposition were evaluated, and the preliminary experiments to understand the kinetics of this process were performed. ASSOCIATED CONTENT Supporting InformationDetailed experimental procedures, spectroscopic data, and compound characterization. This material is available free of charge via the Internet at http://pubs.acs.org.

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Thermometric Quantitative Selective Analysis of Sodium Methoxide in Methanol Industrial Solutions

Cited by 2 publications

References 0 publications

First Time Determination of Important Catalyst Sodium Methoxide Used in Biodiesel by Colorimetric Method

First Time Determination of Important Catalyst Sodium Methoxide Used in Biodiesel by Colorimetric Method

An Under-Appreciated Source of Reproducibility Issues in Cross-Coupling: Solid-State Decomposition of Primary Sodium Alkoxides in Air

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