Method for carrying out the combined operation of a bioethanol production unit and a biogas unit
AssigneeVerbio Vereinigte Bioenergie AG
InventorsFabian BONK, Michael SCHLIMBACH, Oliver LUDTKE
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Abstract
Methods combine the operations of a bioethanol production unit and a biogas unit and comprise: (a) mashing corn meal from a dry milling step with at least 0.1 t of dry matter in the form of whole stillage and at least 0.1 m3 of outflow from the biogas unit per tonne of corn meal; (b) feeding the mash from (a) to a cooking stage with mash temperatures below the gelatinization temperature of the starch in the corn meal, followed by an ethanol-forming fermentation step and then feeding the fermented mash to a distillation step; and (c) feeding the whole stillage from (b) to the mashing step in (a) and to the biogas unit.
Claims16
A method for carrying out the combined operation of a bioethanol production unit and a biogas unit, wherein:
- a) corn meal from a dry milling step is mashed with thin stillage, at least 0.1 t of dry matter in the form of whole stillage and at least 0.1 m3 of outflow from the biogas unit per tonne of corn meal, whereby at least 15 kg of glycerin per tonne of corn meal is recycled to the mashing step via the whole stillage and thin stillage,
- b) the mash from 1a) is fed to a cooking stage with mash temperatures below the gelatinization temperature of the starch in the corn meal, followed by an ethanol-forming fermentation step and then feeding the fermented mash to a distillation step,
- the whole stillage from 1b) is fed to the mashing step in a) and to the biogas unit.
Dependencies are inferred from the claim text.