Applications  [ Return to  Pulp & Paper  ]

CO2 based performance increasing of paper machines
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.  

Ozone Bleaching (ECF or TCF pulps)

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.

White Liquor Oxidation

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 ...)

Lime Kiln Boosting

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. 

Oxygen Delignification

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 

Oxygen Boosted Alkaline Extraction (Eo)

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).

Oxygen Enrichment of Recovering Boilers

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.

Neutralization after Bleaching
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.

Tall Oil Neutralization
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.

Black Liquor Oxidation

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.

Polysulfide Liquor Generation

Did you know ? the polysulfide cooking enables you to increase the pulp yield on your fibers line from 1 to 3 % and therefore increase your unit productivity ; oxygen is used to convert the classical kraft liquor in a " polisulfide liquor " by controlled oxidation.

UV Curing

You use to treat papers, cartons, even wood items to polymerise varnishes by ultraviolet or electro beam ? Take the nitrogen profit : reduction of the photoinitiators costs, and VOC emission, higher quality of treatment, etc.

Waste papers treatment with Ozone

You should notice that ozone can be used to bleach the waste papers as well. In this case, it will not only decolorize the pulp but furthermore will reduce their residual fluorescence coming from the optical whiteners.