The process of lignin removal by oxygen preliminary cleans cellulose fibres before their own bleaching. This technology is a cost-effective alternative for the basic chlorine-less cellulose production. This procedure is unavoidable in case when the step of cellulose bleaching by chlorine was eliminated; the waste liquidation from the bleaching step is no more necessary as well.
The oxygen in the bleaching process helps to reduce the costs and enables to avoid the potentially harmful bleaching chemical usage.
The lignin removal by oxygen/ozone bleaching technology is a new and cost-effective technology that eliminates or reduces the necessity to use chlorine-containing compounds.
Cellulose washing with the carbon dioxide admixture is a process that enhances the washing technology, product quality, cost-effectiveness, and environmental aspects of production. This process has been patented by Linde Gas.
pH regulation by carbon dioxide enhances the working conditions in the pulp mill as well as the cellulose quality as it suppresses corrosion.