The present invention relates to an integrally combined method and a corresponding plant for production of biogas from raw material comprising lignocellulose material, in particular from raw material with high amount of lignocellulose material in an energy and resource saving manner, by applying multiple fermentation steps and optimized recycling steps.
Hydrothermal pretreatment of mechanically compressed straw in unagitated reactors provides a simple and inexpensive solution to poor C5 monomer yields with autohydrolysis processes. Unlike raw straw, compressed straw pellets or briquettes can be pretreated on commercial scale using unagitated batch reactors or simplified unagitated continuous systems. The chemistry of hydrothermal pretreatment is thereby altered such that loss of C5 sugars to unwanted byproduct reactions is reduced. With compressed straw, water content can be introduced within the reactor while it is pressurized, which reduces energy costs and capital expense. Provided are methods of processing straw feedstocks using semi-continuous or continuous systems and a pretreatment reactor adapted to processes compressed straw with high throughput through a small reactor volume in which water content is added within the reactor under pressure.
Hydrothermal pretreatment of mechanically compressed straw in unagitated reactors provides a simple and inexpensive solution to poor C5 monomer yields with autohydrolysis processes. Unlike raw straw, compressed straw pellets or briquettes can be pretreated on commercial scale using unagitated batch reactors or simplified unagitated continuous systems. The chemistry of hydrothermal pretreatment is thereby altered such that loss of C5 sugars to unwanted byproduct reactions is reduced. With compressed straw, water content can be introduced within the reactor while it is pressurized, which reduces energy costs and capital expense. Provided are methods of processing straw feedstocks using semi-continuous or continuous systems and a pretreatment reactor adapted to processes compressed straw with high throughput through a small reactor volume in which water content is added within the reactor under pressure.
There is disclosed a method for processing a biomass (for example straw) containing lignocellulose such that cellulose and hemicellulose are made accessible for further processing, typically by decomposition, without needing energy-consuming dissolution of the biomass in water.
The method includes repeated compressions of the biomass in a reciprocating piston press, where loose biomass is continuously fed into a piston chamber in front of a piston which moves the loose biomass into a tubular reaction chamber in which the biomass is compressed for producing a vapour explosion and autohydrolysis under simultaneous displacement of compressed biomass through the reaction chamber.
After compression, the biomass can be added fluid livestock manure, fluid waste water sludge etc. in a biogas plant for a subsequent biogas process.
C08B 1/00 - Traitement préparatoire de la cellulose pour l'obtention de dérivés cellulosiques
C12P 7/10 - Éthanol en tant que produit chimique et non en tant que boisson alcoolique préparé comme sous-produit, ou préparé à partir d'un substrat constitué par des déchets ou par des matières cellulosiques d'un substrat constitué par des matières cellulosiques
D21C 1/02 - Traitement préalable des matériaux finement divisés avant la cuisson avec l'eau ou la vapeur
C12P 19/14 - Préparation de composés contenant des radicaux saccharide préparés par action d'une carbohydrase, p. ex. par action de l'alpha-amylase
C12P 5/02 - Préparation des hydrocarbures acycliques
A23K 10/12 - Produits alimentaires pour animaux obtenus par des procédés microbiologiques ou biochimiques par fermentation de produits naturels, p. ex. d’origine végétale, de matières provenant de déchets d’origine animale ou de biomasse
A23K 10/32 - Produits alimentaires pour animaux à base de matières d’origine végétale, p. ex. de racines, de graines ou de foinProduits alimentaires pour animaux à base de matières d’origine fongique, p. ex. de champignons à base d’hydrolysats de bois ou de paille
5.
Methods and devices for hydrothermal pretreatment of lignocellulosic biomass
Methods and devices are provided for hydrothermal pretreatment of lignocellulosic biomass. A mechanically simple and inexpensive vertical steam reactor is fed with biomass feedstock from the top, while pretreated material is removed from the bottom in steady-state by operation of moveable upper and lower restrictor means, which project across the reactor cross section when engaged. The vertical column of biomass is supported by the upper restrictor means. This is periodically withdrawn from the reactor cross section, permitting the column of biomass to fall by force of gravity onto the lower restrictor means. The upper restrictor means is then re-inserted, after which the lower restrictor means is withdrawn permitting a “plug” of pretreated material to be removed by force of gravity. Using biomass feedstock that has been compressed in a reciprocating piston press to bulk density of at least 500 kg/m3, which can be fed dry into the reactor using simple, inexpensive sluice systems and then wetted inside the reactor, this system provides comparable biomass throughput at a fraction of the cost of traditional commercial hydrothermal pretreatment systems used in “second generation” biorefining.
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