Thermal Reactions of N-Methyl-morpholine-N-oxide (NMMO): A General Method for Separation and Quantification of N-Methyl-morpholine-N-oxide and its Main Degradation Products N-Methylmorpholine and Morpholine by Capillary Electrophoresis (CE)
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A. Potthast
Summary
A general analytical method based on capillary electrophoresis with indirect UV detection has been developed to separate and quantify N-methylmorpholine-N-oxide (NMMO) and its main degradation products N-methylmorpholine (NMM) and morpholine (M). The electrolyte is based on the two major components 4-methylbenzylamine and 2-hydroxy-2-methylpropanoic acid (hydroxy-isobutyric acid, HIBA), the latter being used to adjust the pH to a value below 3.5 which is crucial for the electrophoretic mobility and, thus, for a good detectability of the amine oxide. The present method is widely applicable to monitor kinetics of reaction mixtures containing NMMO. NMM and M can be determined simultaneously even in a 1000-fold excess of NMMO.
To monitor the fast and exothermic thermal degradation of NMMO by the electrophoretic method, special reaction conditions had to be developed for separating the initial decomposition step from super-imposed subsequent reactions. Reactive degradation products were removed by flushing with nitrogen, and the reaction rate was decreased by dilution with o-dichlorobenzene as an inert solvent. The initial phase of the decomposition reaction has been shown to follow second-order kinetics.
Copyright © 2000 by Walter de Gruyter GmbH & Co. KG
Articles in the same Issue
- Species Index
- Author Index
- Contents
- Subject Index
- Yeast and Bacteria as Biological Control Agents Against Fungal Discolouration of Pinus sylvestris Blocks in Laboratory-Based Tests and the Role of Antifungal Volatiles
- Copper Accumulation in the Digestive Caecae of Limnoria quadripunctata Holthius (Isopoda: Crustacea) Tunnelling CCA-Treated Wood in Laboratory Cultures
- Chromated Copper Arsenate Preservative Treatment of North American Hardwoods. Part 1. CCA Fixation Performance
- Medium Density Fibreboard Manufactured from Blends of White Cypress Pine and Non-Durable Wood Species Shows Increased Resistance to Attack by the Subterranean Termite C. lacteus
- Role of a Labile Terpene Compound in the Assessment of the Age of a Fossil Wood from Siena (Tuscany, Italy)
- Neolignan Skeletons and Benzodioxanes Through Chiral Aryl Alkyl Ether Formation
- Use of β-13 C labelled Coniferyl Alcohol to Detect "End-Wise" Polymerization in the Formation of DHPs
- Bleachability of Alkaline Pulps. Part 1. The Importance of β-Aryl Ether Linkages in Lignin
- Solid State NMR Studies on Cellulose Crystallinity in Fines and Bulk Fibres Separated from Refined Kraft Pulp
- Pulping of Whole Jute Plant (Corchorus capsularies) by Soda-Amine Liquor
- Pattern of Alkali Impregnation of Poplar Wood at Moderate Conditions
- Structure and Reactivity of Lignins and Associated Phenolic Acids in Wheat Straw TMP and CTMP Pulps
- Thermal Reactions of N-Methyl-morpholine-N-oxide (NMMO): A General Method for Separation and Quantification of N-Methyl-morpholine-N-oxide and its Main Degradation Products N-Methylmorpholine and Morpholine by Capillary Electrophoresis (CE)
- The Kismet of Residual During LMS Delignification of High-Kappa Kraft Pulps
- Variations in Transverse Fibre Wall Properties: Relations Between Elastic Properties and Structure
- Application of the GAB Sorption Isotherm Model to Klinki Pine (Araucaria klinkii Lauterb.)
- Strain Changes on the Inner Bark Surface of an Inclined Coniferous Sapling Producing Compression Wood
- Effects of Chemical Modification Reagents on Acoustic Properties of Wood
- J.L. McCarthy In Memoriam
- Acknowledgement
Articles in the same Issue
- Species Index
- Author Index
- Contents
- Subject Index
- Yeast and Bacteria as Biological Control Agents Against Fungal Discolouration of Pinus sylvestris Blocks in Laboratory-Based Tests and the Role of Antifungal Volatiles
- Copper Accumulation in the Digestive Caecae of Limnoria quadripunctata Holthius (Isopoda: Crustacea) Tunnelling CCA-Treated Wood in Laboratory Cultures
- Chromated Copper Arsenate Preservative Treatment of North American Hardwoods. Part 1. CCA Fixation Performance
- Medium Density Fibreboard Manufactured from Blends of White Cypress Pine and Non-Durable Wood Species Shows Increased Resistance to Attack by the Subterranean Termite C. lacteus
- Role of a Labile Terpene Compound in the Assessment of the Age of a Fossil Wood from Siena (Tuscany, Italy)
- Neolignan Skeletons and Benzodioxanes Through Chiral Aryl Alkyl Ether Formation
- Use of β-13 C labelled Coniferyl Alcohol to Detect "End-Wise" Polymerization in the Formation of DHPs
- Bleachability of Alkaline Pulps. Part 1. The Importance of β-Aryl Ether Linkages in Lignin
- Solid State NMR Studies on Cellulose Crystallinity in Fines and Bulk Fibres Separated from Refined Kraft Pulp
- Pulping of Whole Jute Plant (Corchorus capsularies) by Soda-Amine Liquor
- Pattern of Alkali Impregnation of Poplar Wood at Moderate Conditions
- Structure and Reactivity of Lignins and Associated Phenolic Acids in Wheat Straw TMP and CTMP Pulps
- Thermal Reactions of N-Methyl-morpholine-N-oxide (NMMO): A General Method for Separation and Quantification of N-Methyl-morpholine-N-oxide and its Main Degradation Products N-Methylmorpholine and Morpholine by Capillary Electrophoresis (CE)
- The Kismet of Residual During LMS Delignification of High-Kappa Kraft Pulps
- Variations in Transverse Fibre Wall Properties: Relations Between Elastic Properties and Structure
- Application of the GAB Sorption Isotherm Model to Klinki Pine (Araucaria klinkii Lauterb.)
- Strain Changes on the Inner Bark Surface of an Inclined Coniferous Sapling Producing Compression Wood
- Effects of Chemical Modification Reagents on Acoustic Properties of Wood
- J.L. McCarthy In Memoriam
- Acknowledgement
