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Pretreatment method for extracting cellulose and hemicellulose from straw

A technology of hemicellulose and pretreatment, which is applied in the processing of fiber raw materials, pulping of cellulose raw materials, textiles and paper making, etc., can solve problems such as being unsuitable for industrial production, unsuitable for industrial production, and unfavorable for fermentation to produce ethanol.

Inactive Publication Date: 2019-09-17
上海中溶科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Among the above three methods, the first two use the common chemical method in which the pretreatment liquid is lye. This type of method mainly uses NaOH, KOH, Ca(OH) 2 Such as alkaline compounds that are difficult to remove, so that the pH value is around 10~11 to destroy the covalent or non-covalent bonds in lignocellulose, thereby obtaining more cellulose and hemicellulose, and inhibiting the production of lignin , although this method is relatively simple, it is not suitable for industrial production because the residual lye in the subsequent materials is not conducive to fermentation and production of ethanol
The third method uses organic solvents, which are not suitable for industrial production because of the high cost

Method used

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  • Pretreatment method for extracting cellulose and hemicellulose from straw

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Effect test

Embodiment 1

[0053] Weigh 1000 g of crushed corn stalks and put them into the reaction kettle. Use the prepared 3000g ammonia solution as the pretreatment liquid, in which the content of pure ammonia is 2%~20wt%, pump the pretreatment liquid into the kettle in the form of mist at the kettle temperature of 80°C, and stir it, Stir it evenly with the material; start to heat up, and keep the pressure at 0.40MPa at 120°C for 180min; after the heat preservation is over, stop heating, let the reaction kettle release the pressure to the gas recovery device, and continue to use the vacuum pump to remove the ammonia gas when the pressure is 0 And part of the steam is recovered, the temperature is about 70°C, use cold water to cool down (condenser), and drop to room temperature to end the experiment. The sugar yield of this embodiment is shown in Table 1 for details.

Embodiment 2

[0055] Weigh 1000g of crushed corn stalks into the reactor, add 1000g of water to the reactor and stir evenly, then use a pump to inject 100g of triethylamine into the reactor at room temperature in the form of mist feed to make it mix with the material Stir evenly; start to heat up, and keep the temperature at 0.5 MPa at 140°C for 60 minutes; after the heat preservation is over, stop the heating, let the reactor release the pressure to the gas recovery device, and continue to use the vacuum pump to recover ammonia and part of the steam when the pressure is 0. When the temperature reaches about 60°C, start to use cold water to cool down (condenser), and drop to room temperature to end the experiment. The sugar yield of this embodiment is shown in Table 1 for details.

Embodiment 3

[0057] Weigh 1000 g of crushed corn stalks and put them into the reaction kettle. Use the prepared 1500g urea aqueous solution as the pretreatment liquid, the content of pure urea is 20%~25 wt%, use the pump to inject the pretreatment liquid into the kettle in the form of mist at the kettle temperature of 80°C, and stir it, Stir it with the material evenly; start to heat up, and keep the pressure at 0.70MPa at 150°C for 60 minutes; after the heat preservation is over, stop heating, let the reactor release the pressure to the gas recovery device, and continue to use the vacuum pump to remove the ammonia gas when the pressure is 0 , CO 2 And part of the steam is recovered. When the temperature reaches about 70°C, cold water is used to cool down (condenser), and the experiment is ended when it drops to room temperature. The sugar yield of this embodiment is shown in Table 1 for details.

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Abstract

The invention relates to a pretreatment method for extracting cellulose and hemicellulose from straw. The method comprises the steps that a volatile alkali solution is adopted for pretreating the straw, so that covalent bonds or non-covalent bonds in lignocellulose in the straw are damaged; after pretreatment, through temperature increase or pressure reduction or combination of temperature increase and pressure reduction modes, volatile alkali in the volatile alkali solution is recycled. According to the method, by using the characteristic that the volatile alkali is easily removed, the adverse effect of alkali solution residues on following enzymolysis or biological fermentation is reduced, and since the volatile alkali is condensed and recycled, the pretreatment cost can be lowered. According to the pretreatment method, the waste alkali solution is hardly discharged, the ecological environment such as soil is not polluted, and the method is green, environmentally friendly and extremely suitable for industrialization production.

Description

technical field [0001] The invention relates to the extraction of active components in straw, in particular to a pretreatment method for extracting cellulose and hemicellulose from straw. Background technique [0002] Cellulose and hemicellulose are the main components of plant cell walls, and they are also two types of renewable polysaccharides in nature. They are mainly found in plant straw and grain grains, and are a kind of energy with great development value. Resources, the most important use at present is to ferment cellulose to produce bioalcohol. [0003] Lignocellulose is mainly formed by connecting cellulose, hemicellulose and lignin through covalent or non-covalent bonds, so it is difficult to decompose the three. In many patent documents, many methods have been disclosed to realize the decomposition of lignocellulose, including physical methods, chemical methods, physicochemical methods and biological methods. [0004] CN104672350 A discloses a pretreatment met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P19/14C12P19/02D21C3/02
CPCC12P19/02C12P19/14C12P2201/00D21C3/024Y02P20/59Y02P70/10
Inventor 代淑梅李秋园吴超勇
Owner 上海中溶科技有限公司