A New waste-free integrated approach for sapropel processing using supercritical fluid extraction

• Published in: The Journal of supercritical fluids Vol. 166; p. 104991
• Main Authors: Krivonos, Oksana I., Belskaya, Olga B.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2020
• Subjects: Amino acids; Bioactive substances; Carbon materials; Carbonization; Sapropel; Supercritical fluid extraction; Waste-free recycling; Carbonization; Waste-free recycling; Carbon materials; Amino acids; Supercritical fluid extraction; Bioactive substances; Sapropel
• ISSN: 0896-8446; 1872-8162
• DOI: 10.1016/j.supflu.2020.104991

[Display omitted] •Possibilities and strategies of rationality use of sapropels are shown.•Extraction of bioactive substances from sapropel by supercritical CO2 is suggested.•Treatment by supercritical CO2 largely improves further sapropels conversion.•Solid residues after CO2 extraction are used to obtain carbon-mineral materials. 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.