A New waste-free integrated approach for sapropel processing using supercritical fluid extraction was written by Krivonos, Oksana I.;Belskaya, Olga B.. And the article was included in Journal of Supercritical Fluids in 2020.Formula: C5H5NO This article mentions the following:
An integrated approach to the processing of sapropel with the use of supercritical CO2 extraction of bioactive substances with carbon dioxide at the first step of the process is discussed. The dependences of the yield and composition of extracts (8-35 MPa, 50°C) and features of sapropel are established. Further carbonization of the solid residue remaining after extraction results in organic-rich products (phenol and its mono, dialkyl and methoxy derivatives, hydrocarbons C14-C22) and carbon-mineral materials with a total pore volume of 0.681-1.211 cm3 g-1. It was found that the introduction of the initial stage of treatment with supercritical CO2 allows not only extracting valuable amino acids, but also affects the yield, composition and properties of liquid and solid sapropel transformation products at subsequent stages of heat treatment. In the experiment, the researchers used many compounds, for example, Pyridin-4-ol (cas: 626-64-2Formula: C5H5NO).
Pyridin-4-ol (cas: 626-64-2) belongs to pyridine derivatives. Pyridine is diamagnetic and has a diamagnetic susceptibility of â?8.7 à 10â? cm3·molâ?.The molecular electric dipole moment is 2.2 debyes. The standard enthalpy of formation is 100.2 kJ·molâ? in the liquid phase and 140.4 kJ·molâ? in the gas phase. Halopyridines are particularly attractive synthetic building blocks in a variety of cross-coupling methods, including the Suzuki-Miyaura cross-coupling reaction.Formula: C5H5NO