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Method for completely dissolving and rapidly hydrolyzing cellulose and application thereof

A technology of completely dissolving and cellulose, applied in the field of biomass dissolving and hydrolysis, can solve the problems such as the influence of cellulose dissolving that has not been involved, and achieve the effect of lowering the complete dissolving temperature, prolonging the service life and high concentration

Inactive Publication Date: 2010-09-08
XISHUANGBANNA TROPICAL BOTANICAL GARDEN CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Restricted by the conditions at that time, the patent application has not yet involved the influence of acidic solution on the dissolution of cellulose

Method used

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  • Method for completely dissolving and rapidly hydrolyzing cellulose and application thereof
  • Method for completely dissolving and rapidly hydrolyzing cellulose and application thereof
  • Method for completely dissolving and rapidly hydrolyzing cellulose and application thereof

Examples

Experimental program
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Effect test

experiment example

[0033] In order to better understand the essence of the present invention, the technical effect of the present invention and its application prospect in industrial production will be described below with a complete dissolution experiment of cellulose powder.

[0034] Such as figure 1 As shown, the experimental device is a miniature visible diamond reactor (Diamond Anvil Cell), which can rapidly heat the water in the reaction chamber to a high temperature, and can observe the process of dissolving cellulose in the water. A small hole with a diameter of 500 μm is opened on an iron sheet with a thickness of 250 μm to form a reaction chamber 4 with a volume of 50 nL. After water and cellulose were loaded into the reaction chamber 4, the upper and lower diamonds 3 squeezed the small hole to seal the hole and generate pressure. If the two diamonds are loosened, nitrogen gas can enter the small hole and generate bubbles. By adjusting the size of the bubbles, different densities of ...

example 1

[0037] Put cellulose powder and pure water in the reactor, the cellulose concentration is 30%, the heating rate is set at 12.1°C / s; the water density is 887kg / m 3 ;

[0038] Such as figure 2 Shown:

[0039] a: Cellulose is suspended in water and air bubbles before heating;

[0040] b: Heating for 24.36s, when the temperature reaches 320°C, the cellulose becomes transparent and begins to dissolve (bubbles disappear at 180°C);

[0041] c: Heating for 24.9s, when the temperature reaches 326°C, more cellulose dissolves;

[0042] d: After heating for 25.16s, when the temperature reaches 329°C, most of the cellulose dissolves;

[0043] e: Heating for 25.45s, as the temperature further rises to 333°C (260MPa), the cellulose is completely dissolved, and the dissolution time is 1.09s.

[0044] After the reaction, the reactor was opened, and the sugar-like substance remained on the surface of the diamond. Infrared analysis showed that the substance had been hydrolyzed and had the c...

Embodiment 1

[0066] Embodiment 1 (pure water)

[0067] Put the cellulose in pure water to form a cellulose material; heat the pure water to 349°C; mix the pure water and cellulose material into the reactor, the cellulose concentration after mixing is 20%, and the water density is set to 594kg / m 3 , rapidly heated to 349°C, the heating rate is 10.4°C / s, and the cellulose can be completely dissolved in 1.05 seconds to 326°C (12MPa). Cellulose is hydrolyzed into polysaccharides and glucose.

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Abstract

The invention discloses a method for completely dissolving and rapidly hydrolyzing cellulose and application thereof. Cellulose is put into an acid solution with the concentration of 10<-7> to 1M [H<+>] or in an alkaline solution with the concentration of 10<-7> to 1M [OH<->], and the volume ratio of solid to liquid is (0.003 to 1.05) to 1; the acid solution of 10-7 to 1M [H<+>] or the alkaline solution of 10<-7> to 1M [OH<->] is heated to be at the temperature of 261 to 352 DEG C; the products of the step 1 and the step 2 are mixed and put in a reactor; the concentration of the cellulose is 0.1 % to 35%; the concentration of the mixed material solution is regulated to be acid 10<-7> to 1M [H<+>] or alkaline 10<-7> to 1M [OH<->]; the water density is 587 to 997 kg / m<3>, the pressure is set to be 6 to 584MPa, heating rate is 7.8 to 14.8 DEG C / s, the mixture is rapidly heated to be at the temperature of 261 to 352 DEG C, and the cellulose can be completely dissolved in 0.8 to 2 seconds. The method first realizes the complete dissolution and rapid hydrolysis of cellulose at lower temperature, thereby greatly lowering production cost, improving production safety, prolonging service life of equipment, and thus having favorable application prospect.

Description

technical field [0001] The invention belongs to the technical field of biomass dissolution and hydrolysis, and in particular relates to a method for completely dissolving and rapidly hydrolyzing cellulose. At the same time, the present invention also relates to further applications of the dissolution and hydrolysis method. Background technique [0002] Lignocellulosic biomass in nature, such as wood and grass, is composed of about 50% cellulose, 25% hemicellulose and 20% lignin. After hydrolysis, cellulose can be degraded into sugars, which can then be used for fermentation to produce cellulosic alcohol. Because lignocellulosic biomass is insoluble in water, the existing industrial biomass hydrolysis method is mainly to hydrolyze in 0.4~0.8% dilute sulfuric acid aqueous solution ( See Nanjing Forestry College Plant Hydrolysis Technology Teaching and Research Group, Plant Hydrolysis Technology, Agricultural Press, 1961). There is no report on continuous production using a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/03C08L1/02C12P7/10
CPCY02E50/16C08B15/02C08B37/00C08B1/003C08L1/02Y02E50/10
Inventor 方真
Owner XISHUANGBANNA TROPICAL BOTANICAL GARDEN CHINESE ACAD OF SCI
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