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Liquid Carbon Dioxide Stripping  

Collect more CO₂ ... Improve purity… using your existing CO₂ recovery plant.

The Wittemann Add-On Liquid CO2 Stripping System works in conjunction with any existing CO₂ Recovery System. The continuous removal of non-condensable impurities from liquefied CO₂ improves both product purity and yield. Typically CO₂ recovery from breweries and distilleries requires CO₂ to be 99.9%(v) pure at the fermenter prior to starting the recovery process. This results in large CO₂ purge losses from the fermenters while the CO₂ purity improves. By initiating CO₂ recovery earlier (as low as 80%v) in the fermentation cycle more CO₂ is recovered.

 

Can plants other than breweries and distilleries benefit from a Liquid CO2 Stripping System?

In addition to fermentation applications, Wittemann also offers CO₂ Recovery Systems with Liquid CO₂ Stripping Systems for other CO₂ sources such as natural wells and by-product gases from chemical manufacturing plants. E-mail or fax Wittemann today to find out how a Wittemann Liquid CO₂ Stripping System can benefit your organization.

Process Description

CO₂ is liquefied, as normal, in your existing CO₂ condensers. This impure LCO₂ is fed to a new Wittemann stripping column instead of the storage tanks. While impure LCO₂ flows down through a special packed bed, pure vapor CO₂ flows up and strips the non-condensables from the liquid. A significant portion of this now highly impure stripping vapor CO₂ is re-condensed in a new Wittemann CO₂ reflux condenser and returned to the stripping column. The non-condensables are continually purged to atmosphere through a control valve manifold assembly. The pure vapor is derived from a reboiler mounted at the stripping column sump. Our reboilers utilize existing waste heat from hot refrigerant gas rather than generating extra heat with expensive electric power. PLC control of the reboiler output ensures efficient system operation. Depending on your existing building constraints, the pure liquid CO2 either simply flows by gravity to the storage tanks or, is pumped using reliable liquid CO₂ pumps mounted with the stripper package.

Key System Features

• Reduce costs related to outside purchase of CO₂ due to poor in-house CO₂ quality or insufficient quantity.
• Minimize the human element in the turning-in process as well as costly monitoring equipment.
• Higher Yield. Reduce purge losses by eliminating the extensive purging needed on conventional liquefaction systems.
• Assures that the CO₂ you recover will meet the higher standards dictated by today's modern brewery operations.
• More CO₂ collected per barrel brewed by allowing early collection from fermenters at less than 99.9% CO₂ which reduces fermenter blow-off prior to turning-in for CO₂ collection.
• Consistently provides a high liquid CO₂ product purity with an oxygen content of 5ppmv or less, therefore, providing beer flavor stability and prolonged shelf life.
• Reduced quantity of CO₂ vented by having the ability to collect CO₂ from usage areas such as counter-pressure CO₂ gas.
• Reduce environmental impact by having less CO₂ emissions.
• Accomplish all of the above while using equipment that is familiar to brewery operators and maintenance personnel.

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