Process for treating cellulose and cellulose treated according to the process

摘要

The present invention relates to a process for purifying a slurry comprising cellulose, such as microfibrillated cellulose, wherein the process comprises the following steps: —providing a slurry comprising cellulose and liquid, —subjecting the slurry to an electric field inducing the liquid of the slurry to flow, —separating the liquid from the cellulose thus obtaining a liquid depleted slurry, —adding a washing liquid, such as an organic solvent, to the liquid depleted slurry—subjecting the liquid depleted slurry to an electric field inducing the washing liquid of the slurry to flow and—separating the washing liquid from the cellulose, thus obtaining a purified cellulose. The invention also relates to cellulose such as microfibrillated cellulose obtainable from said process.

主权项

1. A process for purifying by salt/ion depletion or free sugar depletion a slurry comprising microfibrillated cellulose, wherein the process comprises the following steps:
a) providing a slurry comprising at least 20% microfibrillated cellulose by solids weight and a liquid, b) subjecting the slurry to a first application of an electric field inducing the liquid of the slurry to flow, c) separating the liquid from the microfibrillated cellulose thus obtaining a liquid depleted slurry, d) adding a washing liquid to the liquid depleted slurry, e) subjecting the liquid depleted slurry to a second application of an electric field inducing the washing liquid of the slurry to flow and f) separating the washing liquid from the microfibrillated cellulose, thus obtaining a purified microfibrillated cellulose.