Pulp & Paper  [ Return towards  Applications ]

Do not hesitate to fully or partly replace your acids (Sulfuric Acid, Alum or SO2) by CO2 : very easy to implement, it will brings you a better pH control, will reduce your corrosion problems under complete safety.

You aim to decrease your bleaching costs and reduce the consecutive emissions ; ozone is an efficient method, already adopted by more than 20 sites. Ozone is produced from oxygen (LOW or VSA) in the generators. AIR LIQUIDE provides you also a knowledge for the bleaching steps, the recovery and re-use of the oxygen rich off-gas. You profit therefore from a fully integrated solution.

Utilization of a white liquor in an oxygen delignification step involves a prior oxidation reaction : Oxygen enables to get a high quality oxidised liquor while minimizing the necessary investment.
Thanks to developments achieved by our researchers teams, highly performant O2 dissolution systems have been performed : they can operate very efficiently with oxygen containing impurities (VSA O2, off-gas coming out of an ozonation process ...)

Your lime kiln is saturated ? Oxygen may help you debottlenecking it and reducing sulfur compounds emission. Air Liquide can help you to implement this technology by specific audits and customized methods for air enrichment.

This process, now used in more than 150 sites worldwide, allows you to reduce production costs, to decrease slightly your chlorine dioxide an/or hydrogen peroxide needs, to increase the quality of the pulp while reducing considerably the wastes.

Found under forms in the modern industry, this process leads also to reduce the chlorinated reagents needs during the bleaching step. Oxygen is often associated with hydrogen peroxide to ensure a greater reduction of the organochlorinated products (AOX).

Your pulp production is limited by a the capacity of your recovery boiler ; Air Liquide and JANSSEN have developed an enrichment technology for the combustion O2 which will let you plan a capacity increasing of 10 to 20 % under complete safety.

CO2 will sharply regulate the pH of the recycled mechanical or chemical pulps after an alkaline bleaching particularly with hydrogen peroxide. Advantages compared with traditionnal acids are the easiness of use, a best pH control, safety of the installations, decreasing in sulfur containing products, etc.

Your Na/S balance is exeeding in sulfur ? Simply replace part of sulfuric acid in your Tall Oil recovery unit by CO2 : this will be achieved in an Air Liquide patented system actually operated in several industrial sites.

In order to reduce the emission of sulfur containing compounds in the atmosphere, black liquors (hard or soft) can be treated with pure oxygen in adapted reactors. A reduction of the calorific capacity can also occurs.