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Detoxification method of wood fiber hydrolyzed sugar liquid

A technology for hydrolyzing sugar liquid and wood fiber, applied in the direction of microorganism-based methods, biochemical equipment and methods, microorganisms, etc., can solve problems such as poor performance, and achieve the effects of improving fermentation performance, sugar utilization rate, and utilization rate

Active Publication Date: 2014-06-25
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the strong hydrophilicity of the silicon-oxygen structure on the surface of bentonite and the hydrolysis of interlayer cations, the performance of unmodified bentonite (raw soil) for adsorption and treatment of organic matter is poor.

Method used

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  • Detoxification method of wood fiber hydrolyzed sugar liquid
  • Detoxification method of wood fiber hydrolyzed sugar liquid
  • Detoxification method of wood fiber hydrolyzed sugar liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Organic modification of bentonite with cationic surfactant.

[0026] Organic modification of bentonite: Use cetyltrimethylammonium bromide (CTAB) as a modifier to organically modify sodium-based bentonite to prepare organic bentonite——CTAB-bentonite, as follows:

[0027] 1. Weigh 2-4g of cetyltrimethylammonium bromide and fully dissolve it in 100ml of distilled water to prepare a 2%-4% cetyltrimethylammonium bromide solution.

[0028] 2. Add 10g of sodium bentonite to the cetyltrimethylammonium bromide solution above to prepare a 10% suspension, and heat it in a water bath at 70°C for 2 hours with stirring. The dosage ratio of sodium bentonite and organic modifier is determined according to the cation exchange capacity of bentonite.

[0029] 3. After heating, centrifuge and discard the supernatant.

[0030] 4. Wash the bentonite obtained by the above centrifugation repeatedly, then dry it at 80° C., activate it at 105° C. for 1 hour, and grind it through a ...

Embodiment 2

[0031] Determination of cation exchange capacity: Wash the soluble salts in bentonite with 50% ethanol solution, then add 0.1mol / L ammonium chloride-50% absolute ethanol extract to fully carry out the exchange reaction; collect the exchange liquid, and add 35% neutral formaldehyde, make it condense with the residual ammonium ion in the exchange liquid to generate formic acid, then immediately titrate with 0.1mol / L sodium hydroxide standard solution, the amount of ammonium ion consumed in the exchange liquid is is the corresponding amount of exchangeable cations. The cation exchange capacity refers to the amount of K adsorbed at a pH of 7 + 、Na + , Ca 2+ , Mg 2+ The total amount of cations, referred to as CEC. The cation exchange capacity of bentonite is the main basis for judging the quality of bentonite. The larger the CEC value, the greater the negative charge, and the stronger its hydration, expansion and dispersion capabilities; otherwise, the worse its hydration, expa...

Embodiment 3

[0037] Example 3: Organic modification of bentonite with cationic surfactant.

[0038] Organic modification of bentonite: Use dodecyltrimethylammonium bromide as a modifier to organically modify sodium-based bentonite, as follows:

[0039] 1. Weigh 2-4g of dodecyltrimethylammonium bromide and fully dissolve it in 100ml of distilled water to prepare a 2%-4% cetyltrimethylammonium bromide solution.

[0040] 2. Add 10g of sodium bentonite to the above dodecyltrimethylammonium bromide solution to prepare a 10% suspension, and heat it in a water bath at 70°C for 3 hours with stirring. The dosage ratio of sodium bentonite and organic modifier is determined according to the cation exchange capacity of bentonite.

[0041] 3. After heating, centrifuge and discard the supernatant.

[0042] 4. Repeatedly washing the bentonite obtained by the above centrifugation, drying at 70°C, activating at 105°C for 2 hours, and grinding through a 100-mesh sieve to obtain.

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Abstract

The invention discloses a detoxification method of wood fiber hydrolyzed sugar liquid. Organic modified bentonite is used as an adsorbent to adsorb and remove a hydrophobic inhibitor in the wood fiber hydrolyzed sugar liquid, wherein the organic modified bentonite is the bentonite which is subjected to modification treatment of a cation surfactant and has a hydrophobic property. According to the detoxification method, the organic modified bentonite is used for carrying out adsorption treatment on the wood fiber hydrolyzed sugar liquid so that a fermentation inhibitor is removed without adsorbing a fermentable sugar; particularly, the content of hydroxymethyl furfural and phenols inhibitors is greatly reduced and the coordinate repression effect of the fermentation inhibitor on the growth and the fermentation of microorganisms is reduced, so that the fermentable performance of the wood fiber hydrolyzed sugar liquid is improved; compared with the wood fiber hydrolyzed sugar liquid which is not subjected to the adsorption treatment, the utilization speed of the microorganisms to the wood fiber hydrolyzed sugar liquid is greatly improved and the fermentation period is shortened; and therefore, the invention provides a new way for the detoxification of the wood fiber hydrolyzed sugar liquid.

Description

technical field [0001] The invention belongs to the technical field of utilization of lignocellulosic raw materials, and in particular relates to a method for detoxifying lignocellulosic hydrolyzed sugar liquid. Background technique [0002] With the depletion of petroleum resources, the research on the production of bioenergy and chemicals from lignocellulosic raw materials has become a research hotspot in recent years. Lignocellulose mainly includes three components: cellulose, hemicellulose and lignin. One of the ways to utilize lignocellulosic raw materials is to degrade the cellulose and hemicellulose into sugars, which are then fermented into ethanol or other chemicals. Cellulose, hemicellulose, and lignin in lignocellulosic raw materials are tightly combined and difficult to be hydrolyzed by cellulase. Therefore, pretreatment is required before enzymatic hydrolysis to increase the accessibility of cellulose in the raw material to enzymes, thereby improving enzyme act...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P7/10C12R1/84
CPCY02E50/16Y02E50/10
Inventor 余世袁勇强赖晨欢李鑫徐勇朱均均
Owner NANJING FORESTRY UNIV
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