The paper industry requires complex production processes in which the use of industrial gases such as oxygen and carbon dioxide plays a crucial role in improving efficiency, quality, and sustainability. The targeted use of these gases makes it possible to optimize production stages, reduce operating costs, and limit environmental impact. One key application is CO₂ acidification during the washing of brown stock pulp. This process lowers the pH, improving cellulose drainage and reducing fiber swelling. The result is greater washing efficiency and lower sodium loss, a valuable substance in the production cycle. In addition, accurate pH control helps achieve more uniform, higher-quality cellulose while also reducing the overall consumption of chemicals. CO₂ is also used for pH neutralization in various production stages. Compared with strong acids, it is less corrosive, increasing the safety of plants and operators. It also ensures more precise regulation of chemical conditions and helps reduce harmful emissions, making the process more sustainable. Another important application is black liquor treatment, a by-product rich in sodium sulfide. Oxidation with pure oxygen converts this compound into sodium thiosulfate, which is more stable and less harmful. This process reduces sulfur compound emissions and improves wastewater treatment efficiency, helping companies comply with environmental regulations. Pure oxygen is also used in delignification, a key process for removing lignin from cellulose. This technology increases the yield of bleached pulp and reduces the absorption of organic halogens, which are often toxic and polluting. The result is cleaner production, with lower use of aggressive chemicals and higher final product quality. For bleaching, the use of ozone represents a highly eco-friendly solution. This gas is a powerful bleaching agent that does not generate harmful by-products. When integrated with chlorine-free technologies, it helps reduce emissions, water consumption, and the pollutant load in wastewater, while also improving the economic efficiency of the process. Nippon Sanso is an excellent example within the industrial gases sector, as it provides innovative and sustainable solutions for the paper and pulp industry. Nippon Sanso’s gases and advanced technologies improve the operational efficiency of companies in the paper industry while also ensuring a safer and more environmentally responsible approach.