The Lantmännen Agroetanol production plant is located at Händelö outside Norrköping. Production takes place in close collaboration with the adjacent combined heat and power plant.
Ethanol can be produced from most raw ingredients that contain sugar or starch, which can in turn be broken down to sugar.
In the Norrköping factory wheat, rye and barley are used as raw ingredients. Around 550,000 tonnes of grain are required to produce 210,000 m3 of ethanol. With a yield of 5.5 tonnes per hectare for wheat/triticale in Central Sweden, the factory's capacity is equivalent to a plantation of 100,000 hectares.
The manufacturing process
- The grain arrives at the factory by lorry and is emptied into an input pit. The grain is transported further via conveyors for cleaning and intermediate storage.
- Milling takes place to a wholegrain flour.
- Mashing – liquefaction and starch-conversion. The flour fraction is mixed with water into a "porridge" after which enzymes are added. The starch in the grain (around 60 per cent of the content) is then broken down into sugar/sugar solution - mash.
- Fermentation. Yeast is added to the sugar solution and converts the sugar to ethanol and carbon dioxide.
- Distillation. To extract the ethanol from the mash, distillation takes place in two stages. The last water is separated in a molecular screen, thereby producing water-free ethanol.
- Feed drying. The alcohol-free mash is called draff. The draff is rich in protein and is thereby a high-quality ingredient in animal feed. Most of the draff is dried and pelleted into Agrodrank™ 90.