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Method for preparing reducing sugar by hydrolyzing biomass with super-critical/sub-critical water in two steps

A subcritical water and biomass technology, applied in the fields of green chemistry and clean energy, can solve problems such as unsatisfactory sugar yield and loss of hemicellulose sugars, and achieve the effect of improving raw material utilization and yield

Inactive Publication Date: 2010-11-17
DALIAN UNIV OF TECH
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  • Description
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing reducing sugars by super / subcritical water two-step hydrolysis of biomass, to solve the problem of hemicellulose sugars in biomass caused by super / subcritical water one-step hydrolysis of biomass under a single condition loss, and the disadvantage of suboptimal sugar yield

Method used

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Examples

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Effect test

Embodiment 1

[0017] Weigh 1.5g of rice straw and 150ml of deionized water into the reaction kettle according to the ratio of solid to liquid mass ratio of 1:100, control the reaction temperature at 190°C, and stir for 40min. After the reaction, the reaction kettle was cooled in an ice-water bath, the product was filtered and centrifuged, and the liquid phase product was subjected to absorbance analysis, and the yield of reducing sugar was 21%. The solid phase residue was washed with distilled water until the filtrate was colorless, and dried to constant weight. Weigh 0.05g of solid phase residue and 5ml of water according to the solid-liquid mass ratio of 1:100 and add them to another tubular reactor, put them into a tin bath with a controlled temperature of 380°C to heat, and after reacting for 20s, take out the ice-water bath to cool. The product was filtered and centrifuged, and the liquid phase product was subjected to absorbance analysis, and the yield of reducing sugar was 24%. The ...

Embodiment 2

[0019] Weigh 1.5g of rice straw and 150ml of deionized water into the reaction kettle according to the ratio of solid to liquid mass ratio of 1:40, control the reaction temperature at 190°C, and stir for 20min. After the reaction, the reaction kettle was cooled in an ice-water bath, the product was filtered and centrifuged, and the liquid phase product was subjected to absorbance analysis, and the yield of reducing sugar was 21%. The solid phase residue was washed with distilled water until the filtrate was colorless, and dried to constant weight. Weigh 0.05g of solid phase residue and 5ml of water according to the solid-liquid mass ratio of 1:100 and add them to another tubular reactor, put them into a tin bath with a controlled temperature of 380°C to heat, and after reacting for 20s, take out the ice-water bath to cool. The product was filtered and centrifuged, and the liquid phase product was subjected to absorbance analysis, and the yield of reducing sugar was 24%. The t...

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Abstract

The invention discloses a method for preparing a reducing sugar by hydrolyzing a biomass with super-critical / sub-critical water in two steps, which belongs to the technical field of new energy. The method is characterized in that the high-yield reducing sugar is prepared by hydrolyzing the biomass with the super-critical / sub-critical water through a two-step method, namely a low-temperature section and a high-temperature section. The hydrolysis reaction is performed under the following conditions that: the temperature is 180 to 230 DEG C; the reaction time is 0 to 60 minutes; and the solid-to-liquid ratio is 1:100-1:20. The method of the invention has the advantages that: under two-step method hydrolysis condition of the super-critical / sub-critical water, hemicelluloses in the biomass arereclaimed; the yield of the biologically hydrolyzed reducing sugar is obviously improved; according to different raw materials, the highest total yield of the reducing sugar can reach 40 to 60 percent; and the recovery rate of the raw material and the reducing sugar is over 70 percent.

Description

technical field [0001] The invention belongs to the technical field of green chemistry and clean energy, and relates to a method for preparing reducing sugar by hydrolyzing biomass in two steps. Background technique [0002] Biomass resources are renewable and widely distributed. Agricultural waste such as crop stalks and chaff, forestry waste such as wood and sawdust, industrial waste such as bagasse, and municipal solid waste are all available biomass resources. In the past, direct combustion was mostly used for the utilization of biomass. Although the method is simple, the utilization rate is low and there are environmental pollution problems. With the help of thermochemical and biochemical means, biomass is converted into biomass fuel with high calorific value and high value-added chemicals, which effectively improves energy utilization efficiency. For example, bioethanol and butanol, which are produced by fermentation after hydrolysis and saccharification of biomass, c...

Claims

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Application Information

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IPC IPC(8): C13K1/02C13K5/00C13K7/00C13K11/00C13K13/00
Inventor 银建中刘慧屏徐刚徐琴琴周丹罗鹏
Owner DALIAN UNIV OF TECH
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