US Patent No. 10,920,372

METHOD FOR SEPARATING CELLULOSE


Patent No. 10,920,372
Issue Date February 16, 2021
Title Method For Separating Cellulose
Inventorship Takashi Tachibana, Hyogo (JP)
Kenichi Hamada, Hyogo (JP)
Assignee EARTHRECYCLE CO., LTD., Hyogo (JP)

Claim of US Patent No. 10,920,372

1. A method for separating cellulose from a wood-based raw material including hemicellulose, cellulose, and lignin as principal components, the method comprising the steps of:injecting the wood-based raw material into a dissolution reservoir in which ethylene glycol is stored as a separating agent, and heating the separating agent in the dissolution reservoir at atmospheric pressure to a temperature in a range of 260° C. to 280° C., and
reacting the wood-based raw material with the separating agent, evaporating a hemicellulose component from the separating agent and condensing the hemicellulose component, monitoring a pH value of the condensate of the hemicellulose component, wherein the pH value changes from an acidic value to a neutral value as a temperature of the separating agent increases, the temperature of the condensate is held at the temperature at which a change in the pH value of the condensate decreases, lignin is dissolved in the separating agent, and crude cellulose that floats in the separating agent is separated and collected.