摘要:
An improved pretreatment of cellulosic feedstocks, to enable economical ethanol production by enzyme treatment. The improved pretreatment comprises choosing either a feedstock with a ratio of arabinoxylan to total nonstarch polysaccharides (AX/NSP) of greater than about 0.39, or a selectively bred feedstock on the basis of an increased ratio of AX/NSP over a starting feedstock material, and reacting at conditions that disrupt the fiber structure and hydrolyze a portion of the cellulose and hemicellulose. This pretreatment produces a superior substrate for enzymatic hydrolysis, by enabling the production of more glucose with less cellulose enzyme than any known procedures. This pretreatment is uniquely suited to ethanol production. Preferred feedstocks with an AX/NSP level greater than about 0.39 include varieties of oat hulls and corn cobs.
摘要:
A method is provided for hydrolyzing polysaccharides in a lignocellulosic feedstock to produce monosaccharides or pretreating a lignocellulosic feedstock, in which an aqueous slurry of the lignocellulosic feedstock is fed into a pressurized dewatering zone wherein the feedstock is partially dewatered and then is compressed into a plug. The plug is introduced into a reaction zone that operates at a pressure (Pr) equal to greater than about 90 psia and under suitable temperature and pH conditions to hydrolyze the polysaccharides or pretreat the feedstock. The plug provides a pressure seal between the outlet of the dewatering zone and the reaction zone. The pressure (Pdwi) of the aqueous slurry of the lignocellulosic feedstock at the inlet of the dewatering device is related to Pr as follows: 0≦ΔP
摘要翻译:提供了一种用于在木质纤维素原料中水解多糖以产生单糖或预处理木质纤维素原料的方法,其中将木质纤维素原料的含水浆料进料到加压脱水区,其中原料被部分脱水,然后被压缩成塞子。 将塞子引入反应区,其在等于大约90psia的压力(Pr)下操作,并在合适的温度和pH条件下水解多糖或预处理原料。 塞子在脱水区的出口和反应区之间提供压力密封。 在脱水装置入口处的木质纤维素原料的水浆料的压力(Pdwi)与Pr有关,如下:0&nlE;&Dgr; P <[(Pr-20psia)和220psia]中的较小者,其中 &Dgr; P是Pr和Pdwi在psia中的绝对压力差。
摘要:
A system for collecting ligno-cellulosic biomass over a large area to enable the commercial refining of biomass from 2,500 to in excess of 50,000 tons of biomass per day to produce ethanol or other products. The biomass is collected at a series of collection points and then transported through a network of conduit “loops” interconnecting each of the collection points and the central refining plant. The water used to transport the biomass, as a slurry, is recovered and sequentially recycled in the same pipeline system to push the biomass slurry around the system in a “loop”.
摘要:
A system for collecting ligno-cellulosic biomass over a large area to enable the commercial refining of biomass from 2,500 to in excess of 50,000 tons of biomass per day to produce ethanol or other products. The biomass is collected at a series of collection points and then transported through a network of conduit “loops” interconnecting each of the collection points and the central refining plant. The water used to transport the biomass, as a slurry, is recovered and sequentially recycled in the same pipeline system to push the biomass slurry around the system in a “loop”.
摘要:
A method is provided for hydrolyzing polysaccharides in a lignocellulosic feedstock to produce monosaccharides or pretreating a lignocellulosic feedstock, in which an aqueous slurry of the lignocellulosic feedstock is fed into a pressurized dewatering zone wherein the feedstock is partially dewatered and then is compressed into a plug. The plug is introduced into a reaction zone that operates at a pressure (Pr) equal to greater than about 90 psia and under suitable temperature and pH conditions to hydrolyze the polysaccharides or pretreat the feedstock. The plug provides a pressure seal between the outlet of the dewatering zone and the reaction zone. The pressure (Pdwi) of the aqueous slurry of the lignocellulosic feedstock at the inlet of the dewatering device is related to Pr as follows: 0≦ΔP
摘要翻译:提供了一种用于在木质纤维素原料中水解多糖以产生单糖或预处理木质纤维素原料的方法,其中将木质纤维素原料的含水浆料进料到加压脱水区,其中原料被部分脱水,然后被压缩成塞子。 将塞子引入反应区,其在等于大约90psia的压力(Pr)下操作,并在合适的温度和pH条件下水解多糖或预处理原料。 塞子在脱水区的出口和反应区之间提供压力密封。 在脱水装置入口处的木质纤维素原料的水浆料的压力(Pdwi)与Pr有关,如下:0&nlE;&Dgr; P <[(Pr-20psia)和220psia]中的较小者,其中 &Dgr; P是Pr和Pdwi在psia中的绝对压力差。
摘要:
A system for collecting ligno-cellulosic biomass over a large area to enable the commercial refining of biomass from 2,500 to in excess of 50,000 tons of biomass per day to produce ethanol or other products. The biomass is collected at a series of collection points and then transported through a network of conduit “loops” interconnecting each of the collection points and the central refining plant. The water used to transport the biomass, as a slurry, is recovered and sequentially recycled in the same pipeline system to push the biomass slurry around the system in a “loop”.