Rückgewinnungsanlagen für CO2 als Nebenprodukt aus Alkoholproduktion

ASCO’s innovative CO₂ Gas Recovery technology turns your vented by-product gas into profitable CO₂.

Alcoholic fermentations, be it from Ethanol operations, Distillery operations, Brewery operations or even Wineries offer a great opportunity to the producer of these varying products or third parties to recover the by-product CO₂ gas as means of creating an additional revenue stream, supply of CO₂ for self use, and also to the extend of green image.

ASCO by-product CO₂ gas recovery plants enhance the overall concept for your recovery opportunity from alcohol sources considering the following key benefits:

• ASCO CO₂ gas recovery plants offer CO₂ gas recovery from a variety of source fermenting substrates;
• Our advanced state of the art technology is strategically positioned for lowest cost production/ton;
• The environmentally friendly technology – gas scrubbing, purifying, drying - eliminates chemical treatment and handling;
• Totally automatic process – plant operations and liquid CO₂ tank farm management;
• The CO₂ gas recovery system achieves liquid CO₂ purity of 99.998% from an inlet CO₂ gas source purity as low as 98.5%;
• Final liquid CO₂ quality exceeds international food and beverage standards.

General Process Description

CO₂ gas is generated as a by-product of the alcoholic fermentation process. This then is collectively reclaimed from the fermentation area through adequately sized collection pipe lines for common feed to the ASCO CO₂ gas recovery system. The gas at this point will be at low pressure and combined purity of >98.5%.

ASCO’s process flow would be first to analyse the raw gas for purity. Once acceptable and subject to process conditions, either a buffer gass balloon or fan blower will  be utilized to get the gas at proper flow to the CO₂ gas main recovery plant for further processing .

The recovery plant compresses CO₂ gas, elevating the pressure to approximately 18 bar g. for CO₂ gas processing that being: washing, purifying, drying and CO₂ gas condensing. Our selection of specially designed compressors offer the best in energy utilization, dry gas compression and ease of maintenance.

Once compressed, CO₂ gas is treated for removal of impurities typically found in alcoholic fermentation gas by high pressure high efficiency CO₂ gas washing (scrubbing) providing an effective removal rate of 99.9%.

ASCO’s system design further enhances the gas quality by proper CO₂ gas purifying. This is accomplished by an activated carbon bed for organic adsorption and final gas drying to a dew point of minus 40°C at pressure (-62°C at atmospheric pressure). The operation is completed with the ASCO Twin Tower CO₂ Gas Deodorizer/Dryer, rendering a final gas which is odour free, colour free, moisture free and taste free, preparing for the last stages of purification.

As a means of final purification the CO₂ gas is condensed (separation of non-condensable gases). CO₂ gas condensing is accomplished by use of an independent refrigeration system that liquefies CO₂ gas at approximately 18 bar g. and minus 24°C. The non-condensable gases present in the CO2 gas are separated and purged from the system automatically and reused for regeneration gas within the plant.  

Liquid CO₂ leaving the CO₂ condenser flows by gravity to a liquid CO₂ purification system to achieve a final liquid CO₂ purity of 99.998%. Thereafter, high quality liquid CO₂ is pumped to a liquid CO₂ storage tank system for inventorying and further handling the liquid CO₂ be it for bulk supply, cylinder supply, dry ice supply for chilling or dry ice supply for blast cleaning.

ASCO welcomes the opportunity to assist you with your CO₂ system requirements and looks forward to hearing from you. Please contact us!