Process for producing agglomerated lignin and use thereof

A process to produce agglomerated lignin with a controlled particle size distribution, the process comprising the steps of

• a) compacting lignin, wherein the lignin comprises a moisture content of from 1 wt-% to 45 wt-%, and wherein the lignin is agglomerated by roll compaction with two or more rolls, wherein the two or more rolls have cavities and wherein a depth of each cavity used in the roll compaction is from 0.1 mm to 10 mm;
• b) subjecting the compacted lignin from step a) to a milling step;
• followed by
• c) a sieving step, wherein the milled lignin of step b) is subjected to sieving to remove particles having a particle diameter below 100 μm and to produce a final agglomerated lignin with a controlled particle size distribution in which a particle size distribution is governed by a porosity of sieving screens used in the sieving step;
• and wherein less than 10 wt-% of the particles retained after step c) have a particle diameter below 100 μm.