Increasing the digestibility of cellulosic material using nitric acid
Patent
·
OSTI ID:5718916
The digestibility of sawdust, rice hulls, bagasse straw, and other plant materials is increased by cooking with HNO/sub 3/ and a nonoxidizing acid at 150 psig for 30 to 60 min. Thus, oak sawdust is mixed with 9 ml HNO/sub 3/ and 0.2 g Fe/lb. and water to provide a mixture with 20 to 50% water. This mixture is autoclaved at 100 to 125 psig for approximately 45 min. The product may be neutralized with NH/sub 3/ or other nontoxic base. Hickory and other woods with a low acidity require the addition of a nonoxidizing acid; H/sub 3/PO/sub 4/ is especially preferred. The crude fiber and N-free extract concentration in the oak sawdust before and after treatment are 55.2 and 31.76% and 27.4 and 65.03% respectively.
- Assignee:
- TIC; EDB-80-004477
- Patent Number(s):
- US 4053645
- OSTI ID:
- 5718916
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
09 BIOMASS FUELS
090222* -- Alcohol Fuels-- Preparation from Wastes or Biomass-- (1976-1989)
AGRICULTURAL WASTES
BAGASSE
CARBOHYDRATES
CELLULOSE
CEREALS
CHEMICAL REACTION YIELD
CRYOGENIC FLUIDS
DIGESTION
ELEMENTS
FLUIDS
GRAMINEAE
GRASS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
IRON
METALS
NITRIC ACID
NITROGEN
NONMETALS
OPTIMIZATION
ORGANIC COMPOUNDS
PHOSPHORIC ACID
PLANTS
POLYSACCHARIDES
REMOVAL
RICE
SACCHARIDES
SOLID WASTES
STRAW
TRANSITION ELEMENTS
WASTES
WOOD WASTES
YIELDS
090222* -- Alcohol Fuels-- Preparation from Wastes or Biomass-- (1976-1989)
AGRICULTURAL WASTES
BAGASSE
CARBOHYDRATES
CELLULOSE
CEREALS
CHEMICAL REACTION YIELD
CRYOGENIC FLUIDS
DIGESTION
ELEMENTS
FLUIDS
GRAMINEAE
GRASS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
IRON
METALS
NITRIC ACID
NITROGEN
NONMETALS
OPTIMIZATION
ORGANIC COMPOUNDS
PHOSPHORIC ACID
PLANTS
POLYSACCHARIDES
REMOVAL
RICE
SACCHARIDES
SOLID WASTES
STRAW
TRANSITION ELEMENTS
WASTES
WOOD WASTES
YIELDS