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Method for preparing fuel ethanol by low-energy consumption wood raw material

A technology of fuel ethanol and low energy consumption, applied in the field of enzymatic hydrolysis, which can solve unseen and other problems

Inactive Publication Date: 2009-12-09
NANJING FORESTRY UNIV
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  • Method for preparing fuel ethanol by low-energy consumption wood raw material
  • Method for preparing fuel ethanol by low-energy consumption wood raw material
  • Method for preparing fuel ethanol by low-energy consumption wood raw material

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Embodiment Construction

[0017] Wood raw materials, such as poplar, are peeled and sliced ​​into log chips with a length, width, and thickness of about 30mm×15mm×5mm by a spiral disc mechanical chipper, and are stacked and stored after air-drying.

[0018] a. In the intermittent stainless steel corrosion-resistant electric heating rotary cooker, add log chips, add 0.5-2.0% (w / w) dilute sulfuric acid according to the solid-to-liquid ratio of 1:8-10 (w / v), and seal the cooking pot , adjust the gyration rate to 1-1.5 rpm, and react at 145-160° C. for 0.5-2.0 h. After the reaction is over, the reactant is filtered through a stainless steel filter to obtain wood chips and xylose liquid. Wash the wood chips with water at 1:5-10 (w / v) to pH 4.8-5.0 to obtain a dilute xylose solution, which is used for the next round of gradient washing of the wood chips. The yield of xylose reaches more than 80.0% of the raw material xylan, the filtering and washing speed of wood chips is higher than that of wood chips by m...

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Abstract

The invention relates to a method for preparing fuel ethanol by adopting a respective fermentation technology of xylose solution and woodpulp enzymolysis solution after completing slicing and dilute acid pretreatment of wood. Due to the adoption of novel processes including dilute sulphuric acid pretreatment and high-concentration jordaning / enzymolysis, the method simplifies production equipment, remarkably saves electricity consumption, operation man hour and production cost during raw material pretreatment and increases the utilization efficiency of xylans; meanwhile, the recovery rate of xylose is over 80.0 percent, and the enzyme hydrolysis yield of cellulose exceeds 65.0 percent. The method realizes efficient utilization of the xylose and glucose and quick fermentation of ethanol, and ensures that the sugar utilization rate and ethanol yield of the xylose and glucose ethanol fermentation respectively reach 82.5 percent, 85.0 percent, 90.0 percent and 92.0 percent.

Description

1. Technical field [0001] The invention belongs to the technical field of enzymatic hydrolysis of wood raw materials in biochemical engineering, in particular to a method for preparing fermentable monosaccharides and fuel ethanol from wood raw materials through dilute acid pretreatment and cellulase hydrolysis. 2. Background technology [0002] Woody raw materials are rich in cellulose and hemicellulose-like high polysaccharides. After pretreatment and hydrolysis, they can produce glucose and xylose-like fermentable monosaccharides, which can be used as sugar platform compounds for biochemical processing, especially cellulose Fermentative production of fuel ethanol. Compared with general grass plant fiber raw materials, the content of polysaccharides in wood raw materials is higher, especially fast-growing wood raw materials have obvious advantages in terms of biomass, raw material collection, transportation and storage, and are more suitable for large-scale industrial prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/10C10L1/02C12R1/72C12R1/865
CPCY02E50/16Y02E50/10
Inventor 徐勇余世袁勇强郑凯慧曾韬
Owner NANJING FORESTRY UNIV
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