Suzano S.a.

Bibiana Ribeiro Rubini

Heloisa Ogushi Romeiro Ramires

Marcos Henrique Luciano Silveira

Estevão Frigini Mai

Matheus Antunes Guimarães

Germano Andrade Siqueira

The present invention relates to a process for producing a nanocellulosic material based on the use of fractioning of cellulosic pulp stream from pre-treatment or mechanical defibrillation (partially refined/defibrillated pulp) in combination with stages of mechanical defibrillation, in which both the accept fraction and the reject fraction can be conveyed to stages of consistency adjustments so as to precede another distinct defibrillation stage. For example, if the accept is conveyed to a consistency adjustment preceding a second defibrillation stage while the reject is conveyed to the other independent stage of consistency adjustment to return to the first stage of mechanical defibrillation.

Process for producing a nanocelullosic material comprising at least two stages of defibrillation of cellulosic feedstock and at least one intermediate fractioning stage

The present invention relates a process to produce microfibrillated cellulose and a microfibrillated cellulose produced according to such process. The fibrillated microfibrillated cellulose is obtained subjecting a cellulose fiber in a slurry of cellulose pulp to multiple mechanical impacts. The cycle may be repeated several times. Non-cutting bars disposed in a ring formation is the preferred method. Two rings concentrically arranged facing each other in high rotation transmit the kinetic energy to the fibers to provide the highly defibrillated microfibrillated cellulose.

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Jacareí, Brazil

Bibiana Ribeiro Rubini