METHODS AND DEVICES TO BOIL LIGNOCELLULOSE MATERIALS Russian patent published in 2012 - IPC D21B1/16 D21C9/16 

FIELD: textile, paper.

SUBSTANCE: for preliminary chemical treatment of wood chips a non-compression reservoir is used, such as a boiler, then there is a grinding device to break previously treated wood chips into bundles of fibres, which are then washed prior to chemical treatment of high consistency. The boiler may be an ordinary tank used for chemical boiling of wood, with or without sorting for withdrawal of a chemical agent. When withdrawn, this chemical may be repeatedly sent into the boiler, provided that was treated in a circulation loop, for instance, heated or with addition of a dissolvent or other chemicals. This boiler may be hydraulic or steam and operate in continuous or portion modes. Then the material treated in the boiler is exposed to grinding in order to convert wood chips into bundles of coarse fibres, which are then washed and dehydrated. After that washed and dehydrated cellulose mass is treated by chemicals with an alkaline peroxide, for the purpose to clarify it and give it other required properties.

EFFECT: such boiler makes it possible to discharge material without using a helical mechanism.

15 cl, 3 dwg