Triethanolamine physical properties

The alkanolamines most frequently used are triethanolamine (TEA), methyldiethanolamine (MDEA), dimethylethanolamine (DMEA), and 3-(dimethylamino)-l,2-propanediol (DMAPD). Other types of esteramines are prepared from aminoethylethanolamine (AEEA) or other ethoxylated amines (Fig. 1). Some physical properties of the alkanolamines are listed in Table 1 [2]. Most alkanolamines are soluble in water. 

Lists of useful matrices for FAB are available and their physical and chemical properties have been compiled. In the authors laboratory where FAB is still routinely applied to the analysis of plant secondary metabolites such as saponins, flavonoid glycosides, fatty acid derivatives and small synthetic peptides Mj.< 3000), two matrices are mainly used glycerol, in the analysis of polar hydrophilic compounds and m-nitrobenzylalcohol (m-NBA) for lipophilic compounds. When glycerol is selected the sample is first dissolved in a cosolvent, methanol or a methanol-water mixture, while in the case of m-NBA dichloromethane is employed as cosolvent to facilitate addition of the sample to the matrix. It is a misconception that FAB can only be applied to the analysis of polar analytes lipophilic compounds such as fatty acids and their derivatives are well amenable to FAB analysis if a lipophilic matrix is selected. Other matrices that have often been employed in peptide analysis include thioglycerol and a eutectic mixture of dithiothreitol and dithioerythritol (3 1, w/w), known as magic bullet . For negative ion FAB the basic matrices di- and triethanolamine have also been used. 

Some processes combine the use of chemical and physical solvents. An example is a dual solvent process based on the use of monoethanolamine and triethanolamine (MEA/TEA) [312-314]. In other cases the process is based on the use of a solvent which exhibits at the same time some of the properties attributed to both physical and chemical solvents. This is notably true for activated methyldiethanolamine, which is used in the MDEA process developed by BASF [311, 314-320, 905, 906]. This solvent, operating at an intermediate temperature, releases a significant part of the dissolved carbon dioxide by flashing, thus reducing the energy required for reboiling and thereby the overall energy consumption. 

---