Kappa number

This article will address the issue of Kappa number, which has become very relevant in recent times. Kappa number is a topic that impacts a large number of people in different areas of life, whether professional, personal, social or cultural. Throughout this article, different aspects related to Kappa number will be explored, from its origin and evolution to its possible future implications. Different perspectives and opinions on the matter will also be analyzed, with the aim of offering a complete and enriching vision of this topic of great interest to today's society.

The Kappa number is an indication of the residual lignin content or bleachability of wood pulp by a standardized analysis method.

Measuring method

The Kappa number is determined by ISO 302:2004.[1] ISO 302 is applicable to all kinds of chemical and semi-chemical pulps and gives a Kappa number in the range of 1–100. 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.

The Kappa number can be monitored by online Kappa analysers in a pulp mill, but these have to be calibrated with the ISO 302:2004 method.

Application

The Kappa number estimates the amount of chemicals required during bleaching of wood pulp to obtain a pulp with a given degree of whiteness. Since the amount of bleach needed is related to the lignin content of the pulp, the Kappa number can be used to monitor the effectiveness of the lignin-extraction phase of the pulping process. It is approximately proportional to the residual lignin content of the pulp.

K ≈ c × L

Where:

K: Kappa number;
c: constant ≈ 6,57 (dependent on process and wood);
L: lignin content in percent.

The Kappa number for bleachable pulps are in the range of 25–30, sack paper pulps in the range 45-55 and pulps for corrugated fiberboard are in the range 60-110.

References

  1. ^ "ISO 302:2004 Pulps — Determination of Kappa number". International Organization for Standardization.