Purification Of Acetonitrile Research Articles

Solid–Liquid–Liquid Equilibria of the System Water, Acetonitrile, and Ammonium Bicarbonate in Multiphase Reacting Systems

The salting out of acetonitrile from water in the presence of ammonium bicarbonate was studied at atmospheric pressure from 4 to 35 °C. The coexisting phases were analyzed independently with H1 nuclear magnetic resonance, ion chromatography, calorimetry, and titrations. The binodal region was described with semiempirical functions and with the UNIQUAC thermodynamic model. The critical composition at ambient temperature is given by 0.02 g/g of salt and 0.58 g/g of acetonitrile: at lower salt concentrations; this mixture is widely employed in liquid chromatography, thanks to the buffering properties of the bicarbonate. The separation of acetonitrile and water for extraction purposes, instead, is often obtained with other ammonium salts. These ternary equilibrium data can then be useful to develop extraction and analysis procedures at buffered, mildly alkaline pH. In addition, this mixture can be encountered during the acetonitrile synthesis proposed from bioethanol and bioethylene, so these multiphase equilibria govern the separation and purification of acetonitrile in specific reactors that allow the recovery of ammonium bicarbonate as a valuable byproduct. Furthermore, the solubility of this salt in alcohols and its decomposition were investigated to target its stability in multiphase reactors, extractors, and driers.

Purification of Acetonitrile

The procedure is described for the purification of acetonitrile to a level suitable for spectroscopic and chromatographic work. Rectification of chemical pretreated acetonitrile was performed on glass vacuum-jacketed column, filled with spiral-prismatic packing.

Purification of acetonitrile

Purification of acetonitrile

Purification of acetonitrile

Purification of acetonitrile

Purification of acetonitrile

Purification of acetonitrile

Purification of acetonitrile and tests for impurities

Purification of acetonitrile and tests for impurities

Purification of Acetonitrile as a Solvent for Exact Measurements.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPurification of Acetonitrile as a Solvent for Exact Measurements.J. F. Coetzee, G. P. Cunningham, D. K. McGuire, and G. R. PadmanabhanCite this: Anal. Chem. 1962, 34, 9, 1139–1143Publication Date (Print):August 1, 1962Publication History Published online1 May 2002Published inissue 1 August 1962https://doi.org/10.1021/ac60189a034RIGHTS & PERMISSIONSArticle Views694Altmetric-Citations184LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (655 KB) Get e-Alerts Get e-Alerts

Growth Substances in the Roots ofVicia faba

An investigation has been made into the growth regulators present in ethanol extracts of the seedling roots of Vicia faba after separation on paper partition chromatograms, using segments of Avena coleoptiles and mesocotyls and of Pisum sativum roots as biological assay material. Acetonitrile purification shows the presence of at least three auxins running in isobutanol : methanol : water, at Rfs of 0-0-25, 0-4-0-6, and 0-65-0-95; the latter may represent two different auxins. A similar, but clearer, picture is shown by the ether-soluble acid fraction. Here an auxin at Rf 0-0 25 als° stimulates root growth and could be 'accelerator a.'. A second at Rf 0-35-0-65 is an indole compound which inhibits root growth and does not seem to be IAA. A third at Rf o-8-i -o is also a root-growth inhibitor and gives no indole reaction. The 'inhibitor i3' com plex was demonstrated (Rf 0-65-0-85) together with a number of other inhibitors at lower Rf value. The ether-soluble neutral component also contains auxins or auxin precursors. The water-soluble, ether-insoluble fraction contains four readily intercon vertible substances with auxin properties. They all appear to inhibit root growth and give no indole reaction.