METHOD OF PRODUCING CELLULOSE Russian patent published in 2016 - IPC D21C1/00 

FIELD: chemistry.

SUBSTANCE: method comprises the saturation and hydrolysis of raw material in a medium of a hydrolysis solution, filtering cellulose, washing with water, filtering and drying, accompanied by using cycles, which include heating the material to 115°C or lower, high-speed pulsed vacuum action with pressure change in the range of up to 5 mmHg in less than 10 s, and then holding under a vacuum and releasing the vacuum. The disclosed method is universal. As the hydrolysis solution a nitric or sulphur acid solution, or mixtures thereof, and an alkaline solution can be used. A spent acid solution from nitrocellulose production can be used, which is less costly.

EFFECT: obtaining cellulose of a required type from any cellulose-containing material, cutting the duration of the cellulose hydrolysis process by an order, reducing the process temperature while obtaining the required chemical and structural homogeneity of cellulose without using equipment of the Federal Environmental Industrial and Nuclear Supervision Service.

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