Combined thermochemical pretreatment and refining of lignocellulosic biomass
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A lignocellulose, pretreatment technology, applied in the direction of biofuel, animal feed, animal feed, etc., can solve the problem of expensive
Inactive Publication Date: 2010-06-16
MASCOMA CORPORATION
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In some cases, the pretreatment regimen typically involves changes in the concentration of the catalyst reagent (e.g., acid); however, the use of pretreatment processes characterized by high concentrations of acid is expensive due to the need to recover and recycle the acid
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[0053] Enzymatic hydrolysis was performed using an excess of enzyme to determine the theoretical maximum yield of monosaccharides using lignocellulosic material that had been pretreated using steam hydrolysis and passed through a refiner. The percentages of the sum of released glucose and xylose are shown in Table 1.
[0054] Hardwood chips underwent steam hydrolysis for 5 to 10 minutes at 160 psig in Andritz's 2 odtpd mechanical pulping system. At the outlet of the system, the pretreated lignocellulosic material is reduced in size at an elevated temperature of about 188°C and a pressure of 160 psig. The refined lignocellulosic material is then released and depressurized to a separate collector. The material is then subjected to enzymatic hydrolysis using cellulase and xylanase. The maximum theoretical sugar yield tested (Method 1) was compared with the various pretreatment methods listed in Table 1.
[0055] Table 1
[0056] Comparison of maximum theoretical sugar yield a...
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Abstract
One aspect of the present invention relates to a method of processing lignocellulosic material, comprising initial steam pretreatment to give pretreated lignocellulosic material with an average particle size, followed by refining to give refined lignocellulosic material with an average particle size, wherein the average particle of the pretreated lignocellulosic material is greater than the average particle size of the refined lignocellulosic material. In ceratin embodiments, the lignocellulosic material is selected from the group consisting of grass, switch grass, cord grass, rye grass, reedcanary grass, miscanthus, sugar-processing residues, sugar cane bagasse, agricultural wastes, rice straw, rice hulls, barley straw, corn cobs, cereal straw, wheat straw, canola straw, oat straw, oat hulls, corn fiber, stover, soybean stover, corn stover, forestry wastes, recycled wood pulp fiber, sawdust, hardwood, and softwoo.
Description
[0001] related application [0002] This application claims priority to US Provisional Patent Application Serial No. 60 / 925,257, filed April 19,2007. Background technique [0003] Processes for producing ethanol from lignocellulosic materials include decomposition and hydrolysis of lignocellulosic materials, such as wood, into disaccharides such as cellobiose, and ultimately into monosaccharides such as glucose and xylose. Microbial agents, including yeast, then convert the simple sugars to ethanol through a fermentation reaction that can take days or weeks. Thermal, chemical and / or mechanical pretreatment of lignocellulosic material can reduce the time required for hydrolysis and fermentation and improve ethanol yield. Many pretreatment methods or processes for lignocellulosic materials have now been developed since the first alkaline pretreatment based on sodium hydroxide impregnation, which improved the digestibility of rice straw, appeared in the early 20th century . ...
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