Cooking equipment
1. Flexible forced-circulation digester - 1 kg scale
A flexible digester-system where all modern pulping processes can be carried out with injections, withdrawal and displacement of cooking liquor/s at controlled compositions, temperatures and pressures. The digester-system consists of a digester (1 kg a d wood) with forced circulation and includes four liquor tanks; two with both internal steam heating coils and electrical heating. Two of the tanks can be pressurized to 20 bar. An atmospheric tank to simulate the counter-current cooking systems can also be connected to the digester. The system includes ceramic membranes that can be used for fractionation of black liquor at full cooking temperature.
The 1 kg flexible forced-circulation digester system can perform all types of pulping processes.
This equipment can also be used in 500 g a.d. scale to study:
- The impact of simultaneous shearing and compression forces on pulp strength potential.
- The impact of wood chip size distribution on liquor pressure drop during delignification.
- The influence of chip column pressure on compaction of the chip column.
- The effect of different raw material combinations on hydraulics and materials-exchange processes during delignification.
The impact on the pulp strength potential of shearing and compression forces during pulping can be studied.
2. Digester with forced circulation - 2 kg scale
3. Digester with forced circulation – 40 kg scale
Pilot digester for 40 kg a.d. wood or other biomass with forced circulation and 250 - 300 L liquid. Heating through indirect heat exchange liquor-steam. The main applications are to produce large volumes of cooking liquor and pre-treatment liquids in alkaline or acidic conditions as well as pulp fibres or other materials. Temperatures of up to 170°C and a liquor-to-wood ratio of 6:1 or higher.
Large volumes of process liquors and/or fibre material can be produced in this steam-heated, forced-liquor circulation batch digester
4. Flow-through digester – 200 g scale
A digester for 200 g a.d. wood, giving full control of the cooking liquor composition during the cook. We can thereby study the influence of e.g. liquor composition, ionic strength and sulphidity on pulp properties in each phase of the cook.
5. Autoclaves– 5–300 g scale
Autoclaves of different sizes, from 5 to 300 g a.d. wood. The autoclaves are heated electrically or using indirect steam in a glycol bath.
Defibration of pulps with high kappa number
Pulps with a high kappa number can be defibrated in a laboratory scale Sprout Waldron refiner. The refining is mostly carried out in water at room temperature, but it is also possible to use other solutions and temperatures if desired, up to a maximum of 80°C. The refining slit is adjustable between 0.15 and 0.5 mm.
Oxygen delignification and bleaching equipment
Innventia has equipment for all types of laboratory scale bleaching of chemical pulp, for example:
- Bleaching using chlorine and hypochlorite
- Multi-stage oxygen delignification with different configurations
- Bleaching using ozone and peracetic acid.
Oxygen delignification and hydrogen peroxide bleaching at high temperature (> 100 °C) and high pressure is carried out in rotating Teflon-coated autoclaves. Oxygen delignification can be performed with different multi-stage configurations.
For liquid bleaching stages (chlorine dioxide (D), hydrogen peroxide (P), peracetic acid (Paa)) and treatment with chelating agents (Q) at bleaching temperatures below 100 °C, the more conventional and established technique with polyethylene bags is used.
Ozonation at high consistency, 40 %, takes place in different kinds of rotating vessels.
Technical data for the Innventia equipment for oxygen delignification and bleaching operations:
|
Reactor
|
Volume
(l)
|
Pulp Sample
(g)
|
Consistency
(%)
|
Max. temp.
(°C)
|
Max. press.
(bar)
|
Remarks
|
|
High intensity mixer
|
0.8
|
80
|
10
|
95
|
3
|
Water jacketed, Teflon coated
|
|
Rotating vessels
|
1-3, 13
|
40, 200
|
40
|
room
|
atm
|
Ozone
|
|
Autoclaves
|
1-2.5
|
10-125
|
12
|
180-200
|
10-30
|
Polyglycol bath/electrically heated, Teflon coated
|
|
Polyethylene bags
|
≤2.5
|
10-200
|
3-10
|
95
|
atm
|
Water bath
|