Skalar introduces the automatic Lignin (Kappa number) analyzer

In chemical pulping, the kappa number is conventionally used to provide feedback that supports optimum pulping conditions. The Skalar automatic laboratory Kappa number analyzer automates the manual procedure according to ISO 302 and others for the determination of the lignin, which is used to describe the degree of delignification attained in a chemical pulping process.The Skalar SP50 or SP1000 analyzer concepts offer maximum degree of automation for reliable and stable kappa number analysis, reducing human error, saving laboratory time and reagents.

Analyzer design and lay-out:


The "Kappa Number" test, determines oxidation potential in the pulp sample by a quantity of 0,02 mol/l potassium permanganate solution consumed by a sample of pulp in 10 minutes at 25° C.

Automatic procedure on SP1000 / SP50 after sample pretreatment.

  1. Place the disintegrated pulp samples in a max. two liter (or smaller) beaker in the thermostatic block (25°C ) of the robotic analyzer. The manipulator is lowered into the first sample and stirs the sample continuously during analysis
  2. Potassium permanganate and sulphuric acid solution are pumped in the sample container
  3. After 10 minutes potassium iodide is added to stop the reaction
  4. Free Iodine in the sample is titrated using a sodium thiosulfate solution
  5. Blank sample is analyzed according to step 1 to 4 ( without pulp)
  6. The result of the sample is calculated

Sample capacity:

The SP50 robotic analyzer can handle 6 bottles of 2 ltr each

The SP1000 robotic analyzer handles 18 bottles of 2 ltr each

The volumes of the sample containers (500ml) and reagent can be reduced to increase the amount of samples handled in one batch on the analyzer and save reagent.

For more information please contact Skalar.