METHOD OF OBTAINING CELLULOSE FROM LIGNOCELLULOSE-CONTAINING BIOMASS Russian patent published in 2014 - IPC D21C3/20 

FIELD: chemistry.

SUBSTANCE: described is a method of obtaining cellulose by the separation of lignin from a lingocellulose-containing biomass in the form of plants or their parts, in which the lingocellulose-containing biomass is boiled in a digester in an alkaline medium, containing alkanolamine, and the dissolved lignin is separated from the obtained raw cellulose. The claimed method is characterised by the fact that the lingocellulose-containing biomass is not produced from wood and is solubilised at a temperature lower than approximately 170°C in a boiling agent based on alkanolamine and water, where the weight ratio of alkanolamine and water constitutes from 60:40 to 30:70, and the obtained raw cellulose is separated from the spent alkaline solution by usual methods. The claimed method is especially advantageous for obtaining cellulose from annual plants, in particular from wheat straw. The claimed method is characterised by high efficiency, in particular due to a great degree of the applied alkanolamine regeneration and results in a smaller impact on the environment with sewage waters and to lower the utilisation cost.

EFFECT: method realisation results in high cellulose output and prevents decomposition of alkanolamine, in particular monoethanolamine (MEA) to a greater degree.

26 cl, 8 tbl, 1 dwg