Washed pulp
In case the washed pulp goes to the bleaching process.
At Nippon Gases we are called “The Gas Professionals” for a reason, and it’s because we’ll be able to solve any doubt.
The CO2 dissolves in water and forms carbonic acid to reduce the pH levels in the brownstock.
Increase productivity and achieve higher process stability by injecting CO2 into the wash water at the final stage of the washing cycle. Lower brownstock pH reduces fiber swelling and leads to a better pulp drainage improving washing efficiency. Lower pH levels also reduce sodium loss in the washing stage.
CO2 acidification of brownstock washers can reduce your pulp and paper production chemical cost. It can clean up your pulp and reduce overall chemical consumption.
How acidification works
The black liquor and pulp must be separated after they exit the digester so that the pulp can go on to the papermaking process.
This separation occurs on brown stock washers, where water is used to wash the black liquor from the pulp.
Reduction of dilution factor
CO2 also allows a reduction of the chlorinated agents usedat the first stage. Increase content of solids black liquor.
Chemical losses
Minimise chemical losses at the black liquor.
Recovery system
Recovery system (NaOH): low chemical comsumption (paper machine).
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…