What is the correct definition of Kappa number?
What is the correct definition of Kappa number?
The Kappa number is a measurement of standard potassium permanganate solution that the pulp will consume. The measurement is inflated by the presence of hexenuronic acids in the pulp. These compounds are formed during the chemical pulping process, from the hemicelluloses.
How to calculate Kappa number of pulp?
Principle. The kappa number is one of the significant parameters for pulp production. It is determined as the volume of N/10 KMnO4 solution consumed by one gram of air-dried pulp in an acidic medium.
What is the full form of TMP in paper and pulp industry?
Two major mechanical pulps are thermomechanical pulp (TMP) and groundwood pulp (GW).
Why is it called kraft pulp?
The process name is derived from German word Kraft, meaning “strength” in this context, due to the strength of the kraft paper produced using this process.
What is black liquor in a paper mill?
In industrial chemistry, black liquor is the by-product from the kraft process when digesting pulpwood into paper pulp removing lignin, hemicelluloses and other extractives from the wood to free the cellulose fibers.
What is chemi mechanical pulping?
Chemi-mechanical pulp is a pulping process that separates fibrous materials by combining three ways like chemical, heat and mechanical. Pulp yield of chemi-mechanical pulp is about 80~90%. APMP is short for alkaline peroxide mechanical pulp, which is a kind of new technology for high yield of paper pulp.
What is pulp explain mechanical pulping?
Mechanical pulping is a process used for separating fibers without the addition of any chemicals. The process gives a pulp that is generally characterized by high yield that ranges from about 92 to 96%, and has high bulk, stiffness, opacity, and softness.
At what percentage would black liquor be considered heavy?
It is normally concentrated to 65 – 80% by multi-effect evaporators and burned in a recovery boiler to produce energy and recover the cooking chemicals.
