An arrangement for feeding and dewatering lignocellulosic material in a hydrolysis process between a first reactor unit, where the material is partly hydrolyzed, to a second reactor unit, wherein the first reactor unit operates at a first pressure and the second reactor unit operates at a second pressure being higher than the first pressure. The arrangement includes a first plug screw feeder arranged to receive the partly hydrolyzed material from the first reactor unit and being arranged to compress, dewater and transport the material, wherein the first screw feeder is arranged to operate at a pressure being higher than the first pressure. A dilution vessel is coupled to receive material from the first plug screw feeder and including a liquid inlet for receiving liquid to wash the material, wherein the dilution vessel is arranged to maintain or increase the pressure (PDM). A second plug screw feeder is arranged to receive the diluted material and to compress, dewater and transport the material to the second reactor unit, wherein the second screw feeder is arranged to operate at a pressure being higher than the pressure of the first plug screw feeder. A system including such an arrangement and a first reactor unit and a second reactor unit is also presented.

An arrangement for feeding and dewatering lignocellulosic material in a hydrolysis process between a first reactor unit, where the material is partly hydrolyzed, to a second reactor unit, wherein the first reactor unit operates at a first pressure and the second reactor unit operates at a second pressure being higher than the first pressure. The arrangement includes a first plug screw feeder arranged to receive the partly hydrolyzed material from the first reactor unit and being arranged to compress, dewater and transport the material, wherein the first screw feeder is arranged to operate at a pressure being higher than the first pressure. A dilution vessel is coupled to receive material from the first plug screw feeder and including a liquid inlet for receiving liquid to wash the material, wherein the dilution vessel is arranged to maintain or increase the pressure (PDM). A second plug screw feeder is arranged to receive the diluted material and to compress, dewater and transport the material to the second reactor unit, wherein the second screw feeder is arranged to operate at a pressure being higher than the pressure of the first plug screw feeder. A system including such an arrangement and a first reactor unit and a second reactor unit is also presented.

A fibre processing apparatus for use in mechanical manipulation and/or processing of material. The apparatus includes an inlet at a first end for introduction of material and/or liquid contained in the material, an outlet downstream of the inlet which manipulated and/or processed material and/or liquid leaves, intermediate the inlet and outlet is a screw processor including at least one shaft having an axis of rotation, the shaft having a plurality of elements provided to cause mechanical manipulation and/or processing and/or cutting of the material. At least one of the plurality of element includes a partially textured exterior surface or wall. The manipulated/processed material being selected from a group of: fibres, cellulose fibres, powders, granules, foodstuffs, pharmaceuticals and/or plastics. The invention further discloses a screw processor element and a method of treating a composition comprising cellulose fibre.

A fibre processing apparatus for use in mechanical manipulation and/or processing of material. The apparatus includes an inlet at a first end for introduction of material and/or liquid contained in the material, an outlet downstream of the inlet which manipulated and/or processed material and/or liquid leaves, intermediate the inlet and outlet is a screw processor including at least one shaft having an axis of rotation, the shaft having a plurality of elements provided to cause mechanical manipulation and/or processing and/or cutting of the material. At least one of the plurality of element includes a partially textured exterior surface or wall. The manipulated/processed material being selected from a group of: fibres, cellulose fibres, powders, granules, foodstuffs, pharmaceuticals and/or plastics. The invention further discloses a screw processor element and a method of treating a composition comprising cellulose fibre.