Back to results
US 4,608,245 AGranted
Method of separation of sugars and concentrated sulfuric acid
OwnerJames L. Gaddy, Edgar C. Clauseninventors
Life of this patent
Estimating the term…
Abstract
A method of recovering concentrated sulfuric acid from the product obtained from the acid hydrolysis of a cellulose-containing material such a biomass. The method involves contacting the product with an extraction solvent comprising one or more of the C.sub.4 -C.sub.7 alcohols as the major component to separate the product into a sulfuric acid enriched phase. The sulfuric acid from this enriched phase is then separated and recovered by a further extraction procedure.
Claims9
A method of recovering sulfuric acid from the crude product obtained from the acid hydrolysis of a cellulose-containing material, said method comprising the steps of:
- contacting the crude product with a solvent comprising at least 50% of one or more of the C.sub.4 -C.sub.7 alcohols and separating said product into a sulfuric acid enriched alcohol phase and a sulfuric acid depleted aqueous phase;
- and
- separating the phases and recovering the sulfuric acid from the sulfuric acid enriched alcohol phase.
Dependencies are inferred from the claim text.