South-Eastern Finland University of Applied Sciences (Xamk) is purchasing a pilot scale pressurized high-consistency batch wise reactor according to this tender documentation. Reactor will be located to Fiberlaboratory RDI-unit in Savonlinna.

Pricing must include shipping costs to Savonlinna Finland (Vipusenkatu 10, 57200 Savonlinna, Finland).

Installation is not needed.

Primary use for the reactor is cellulose derivatization. The cellulose material to be mixed is mainly moist, sticky and fibrous, and the reactions will be done in high consistencies. ‘High-consistency’ refers to cellulose pulp, which contains even less than 70 % water. At this consistency, the pulp behaves almost like a solid and is challenging to mix. Thus special mixing elements such as shovels and chopper(s) are required. Mixing shovels are to enable complete mixing throughout the whole reactor volume, such as ploughshare shovels. Chopper is required to shred the cellulose material and ensure homogenous mixing conditions and that the mixed material is not only rotated around the reactor. The mixing elements should be able to disperse cellulose fibers but the mixing should not be so strong that it breaks the individual fibers. This is important when the desired product is surface-treated cellulose fibers, as opposed to ‘bulk treated’ cellulose, where the entire cellulose fiber structure is derivatized.