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Method for separating lignocellulose-containing biomass with methanoic acid

A technology of lignocellulose and lignin, which is applied in the field of separating lignocellulose-containing biomass into lignin, separating lignocellulose-containing biomass, hemicellulose and cellulose components, and can solve the problem of increased operational difficulty etc. to save energy, achieve solvent recovery, and achieve high concentration

Inactive Publication Date: 2008-07-16
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, both steam explosion and ethanol extraction processes need to be carried out under high temperature and high pressure conditions, which will increase the difficulty of operation

Method used

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  • Method for separating lignocellulose-containing biomass with methanoic acid
  • Method for separating lignocellulose-containing biomass with methanoic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The corn stalks are crushed, and the material of the stalks with a particle size of 20-80 meshes is composed of 35.6% cellulose, 21.6% hemicellulose and 18.1% lignin. Weigh 1000g of 20-80 mesh straw, add 10L formic acid (88%) and 100mL hydrochloric acid (37%) into the pretreatment bottle, start the constant temperature water bath, keep the reaction temperature constant at 65°C, the oscillation speed at 150rpm, and treat at normal pressure 3h, the sample bottle was taken out, placed in a low-temperature water bath, and the reaction slurry was subjected to solid-liquid separation (vortex centrifugation or suction filtration), wherein, the solid components were washed with water and then dried to obtain a total of 431g of materials, including 75.1% cellulose, The retention rate reaches 91%. Under the action of cellulase (30FPU / g glycoside), the material is hydrolyzed for 24h in pH4.8 citric acid buffer solution at 50°C, and its hydrolyzate is measured by HPLC (as shown in F...

Embodiment 2

[0032] The corn cob is crushed, wherein the core material with a particle diameter of 20-80 meshes is composed of 35.9% cellulose, 35.2% hemicellulose and 18.1% lignin. Weigh 100g of 20-80 mesh straw, add 1L of formic acid (88%) and 5mL of hydrochloric acid (37%) into the pretreatment bottle, start the constant temperature water bath, keep the reaction temperature constant at 55°C, the oscillation speed at 150rpm, and treat at normal pressure 3h, the sample bottle was taken out, placed in a low-temperature water bath, and the reaction slurry was subjected to solid-liquid separation (vortex centrifugation or suction filtration), wherein, the solid component was washed with water and then dried to obtain a total of 45.8g of material, which contained cellulose 68.5 %, the retention rate reaches 87%. Under the action of cellulase (30FPU / g glycoside), the material is hydrolyzed in pH4.8 citric acid buffer solution at 50°C for 24 hours, and the cellulose conversion rate can reach 72%...

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Abstract

The invention relates to a method for using formic acid to separate biomass of lignocelluloses which includes the following steps: the formic acid solution with little hydrochloride is added into the agroforestrial waste, and reaction carries out for 1 to 10h at the temperature of 50 to 100 DEG C; the solid substances are separated and hydrolyzed after being water washed and dried in the buffer solution with the pH value of 4.8 by the cellulose enzyme under the temperature of 50 DEG C, the formic acid is recycled from the obtained liquid material, the lignose obtained by separating the lignose (formic acid lignose) solid-liquid, which is not dissolved in water can be used for the high-value transformation after being washed by water. The main components of the liquid material are reduced sugars obtained by hydrolyzing xylose, wood oligose and other hemicelluloses. The invention has the advantages of separating the lignocellulose into components, realizing the using of the whole biomasses, and finishing the green technique route of the solvent recovery.

Description

technical field [0001] The invention relates to a treatment technology of lignocellulose-containing biomass, in particular to a method for separating lignocellulose-containing biomass by formic acid. Specifically, it is a method for separating lignocellulose-containing biomass into lignin, hemicellulose and cellulose components. A method for component separation and solvent recovery of lignocellulose is achieved by using volatile formic acid to pretreat crop straw, corncobs, rice husks, wood chips, etc. at normal pressure and medium temperature. Background technique [0002] Mineral resources such as oil, coal, and natural gas are currently the most important energy materials and chemical raw materials. In the 21st century, human beings are facing multiple pressures such as energy shortage, environmental pollution, and shortage of raw materials brought about by the rapid consumption of these mineral resources. Therefore, how to develop renewable energy and resources efficie...

Claims

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Application Information

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IPC IPC(8): D21C5/00
Inventor 苏荣欣齐崴何志敏张名佳黄仁亮
Owner TIANJIN UNIV
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