Open AccessA USE OF PENTOSAN-CONTAINING FRACTION OF NEUTRAL LIGNOSULFONATES FOR OBTAINING FURANE DERIVATIVES
Author(s) -
Irina A. Chetverneva,
О Х Каримов,
Г. А. Тептерева,
Natalia S. Tivas,
Э. М. Мовсумзаде,
Elbay R. Babayev
Publication year - 2021
Publication title -
izvestiâ vysših učebnyh zavedenij. himiâ i himičeskaâ tehnologiâ/izvestiâ vysših učebnyh zavedenij. seriâ himiâ i himičeskaâ tehnologiâ
Language(s) - English
Resource type - Journals
eISSN - 2500-3070
pISSN - 0579-2991
DOI - 10.6060/ivkkt.20216402.6300
Subject(s) - lignosulfonates , chemistry , organic chemistry , chromatography , lignin , polysaccharide , monosaccharide , hydrolysis , sulfite
The article describes the technological possibility and gives a conditional scheme of obtaining, based on the carbohydrate part of neutral lignosulfonate, useful products such as furfurol, furan, tetrahydrofuran, properties which have a number of significant physicochemical differences from the properties of lignosulfonate obtained as a result of sulphite brews. The article discusses features of aromatic and carbohydrate constituents of neutral lignosulfonates, monomeric units of aromatic part, structure of polysaccharide components of carbohydrate part, as well as lignocarboxylic matrix characterizing their combination in macromolecule of lignosulfonate. On this basis, the possibility of using neutral LSTs as pentose-containing raw materials was studied and experimentally realized. The experimental part of the article proposes a method of fractionation of lignosulfonates, in our case lignosulfonates of the neutral-sulfite method of delignification of wood raw materials. Samples of the neutral lignosulfonate that was the subject of the study were subjected to alkaline hydrolysis, after which fractionation was carried out by exclusive chromatography or gel filtration on Sephadex grade 100. Water was used as eluent. Fractions were taken by volume, the composition of fractions, both aromatic and carbohydrate, was determined by UV spectroscopy. The criterion for the composition of the fraction was the presence or absence of peaks on the spectrogram in the wavelength region characteristic of the hydroxyl phenolic groups of the aromatic part of neutral lignosulfonates and monosaccharides of the pentose class. The combined polysaccharide fractions represented mainly by xylanes (pentosans) were extracted into an organic solvent, followed by distillation and boiling of the furan-containing compounds. Material balance of the process of producing furan derivatives based on pentose-containing component of neutral lignosulfonates is drawn up.