HPLC of Formula: 931-40-8. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: 4-(Hydroxymethyl)-1,3-dioxolan-2-one, is researched, Molecular C4H6O4, CAS is 931-40-8, about The role of impurities in the La2O3 catalyzed carboxylation of crude glycerol. Author is Razali, N. A.; Conte, M.; McGregor, J..
The direct carboxylation of crude glycerol, obtained as a byproduct of bio-diesel synthesis, with CO2 has been investigated over lanthanum oxide as a heterogeneous catalyst for the first time. Adiponitrile is employed as a dehydrating agent in order to shift the reaction equilibrium to the product side. The selectivity of the reaction towards glycerol carbonate when using crude glycerol is significantly reduced as compared to employing refined glycerol: 2.3% cf. 17% resp. Glycerol conversion, however remains approx. constant: 54% cf. 58%. In order to understand the role of the impurities present in crude glycerol, model systems consisting of refined glycerol and one or more of water, methanol, Me palmitate (as a model fatty acid Me ester), and sodium methoxide have been prepared and used as reaction media to systematically evaluate their effect. All of these impurities are seen to reduce the selectivity towards glycerol carbonate, instead favoring the formation of 4-(hydroxymethyl)oxazolidin-2-one, with the exception of methanol where no detrimental effect is observed and the measured selectivity increases slightly to ca. 22%. This effect is ascribed, in part, to improved mass transfer as a consequence of an increased solubility of carbon dioxide in the liquid media when methanol is present. Addnl., adiponitrile is observed to play a crucial role in the reaction mechanism beyond its simple role as a dehydrating agent. These results provide insights into the required purification steps for crude glycerol, and suggest the possibility of employing crude glycerol directly, and its use as a chem. feedstock; in both cases by minimizing costly separation and purification steps.
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