Lower cost
Lower overall bleaching chemical costs.
At Nippon Gases we are called “The Gas Professionals” for a reason, and it’s because we’ll be able to solve any doubt.
Delignification with oxygen reduces active chlorine requirements, environmental impact and water treatment operational costs
Oxygen delignification enhances yield in bleached pulp production and offers relevant operating cost advantages over the use of bleaching agents. Not less important is the environmental benefits it leads to, mainly the minimisation of Adsorbable Organic Halides (AOX). Also, oxygen application leads to lower wastewater treatment oxygen requirements and less color in effluent.
How oxygen delignification works
The process of lignin removal uses oxygen to reduce active chlorine requirements in the bleaching plant.
This process is an important step towards Total Chlorine Free (TCF) and Elemental Chlorine Free (ECF) in pulp production.
Less environmental impact
Reduced or eliminated AOX production reducing environmental impact.
Lower BOD/COD
Lower BOD (Biochemical Oxygen Requirement)/COD (Chemical Oxygen Requirement) production and less colour in the effluent.
Reduced wastewater
Reduced wastewater treatment costs (COD and colour removal).
Better yield
Better yield than extended cooking.
Important bleaching
Important bleaching step towards TCF or ECF pulp production and mill closure.
Oxygen in delignification
We can find different types of delignification processes:
- HCOD, High Consistency Oxygen Delignification.
- MCOD, Medium Consistency Oxygen Delignification (following bullets within MCOD):
- Double stage.
- Single stage.
- Mini.
- Pre, bleaching cellulose HCOD and MCOD
applications are well stablished technologies, adapted
to the concept of a modern plant.
Latest Company News
31.03.2026
Nippon Gases changes its company name to Nippon Sanso on April 1st 2026
Nippon Gases, the European subsidiary of Nippon Sanso Holdings Corporation (referred to as “The Group”), will officially change its name…
03.03.2026
Oximesa Acquires Esteve Teijin Healthcare And Strengthens Its Home Respiratory Therapy Services Across The Iberian Peninsula
Nippon Sanso Holdings Corporation (NSHD), through its European subsidiary Oximesa, has acquired Esteve Teijin Healthcare (ETH), in a move that reinforces its…
24.09.2025
Nippon Gases to rename as Nippon Sanso from April 1st 2026
Nippon Gases, the European subsidiary of Nippon Sanso Holdings Corporation, announces that, starting April 1st 2026, the company will operate…