METHOD OF PRODUCING CELLULOSE FOR CHEMICAL PROCESSING Russian patent published in 2020 - IPC D21C1/02 

FIELD: paper.

SUBSTANCE: invention relates to production of cellulose and can be used in enterprises of pulp and paper industry in making sulphate cellulose for chemical processing using additives, facilitating reduction of content in the end product of accompanying ingredients, such as lignin, ash and resin components. Method includes two steps of extraction of cellulose-containing raw material with sulphur-containing agents in presence of additive: sulphate cooking in boiler of periodic action and bleaching, first extraction stage is carried out with water, and as an additive, a decipherer is used, the second extraction stage is carried out with a sulphur-containing reagent mixed with a complexing agent.

EFFECT: invention enables to obtain cellulose with low content of residual lignin, hemicellulose, ash and resin components, wherein the content of α-cellulose in the end product is maintained at the level of suitability thereof for producing nitrocellulose, hydrate-cellulose and carbon fibres.

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