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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, reducing content, and shortening the fermentation cycle

Active Publication Date: 2012-10-10
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 bentonite to prepare organic bentonite—CTAB-bentonite. Follow the steps below:

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

[0028] 2. Add 10g of sodium bentonite to the cetyltrimethylammonium bromide solution to prepare a 10% suspension, and stir and heat it in a water bath at 70°C for 2h. 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. The bentonite obtained by the centrifugation is washed repeatedly, dried at 80°C, activated at 105°C for 1 hour, and ground through a 100-mesh sieve to obtain CTAB-bentonite.

[00...

Embodiment 2

[0031] Determination of cation exchange capacity: Wash the soluble salts in bentonite with 50% ethanol solution, and then add 0.1mol / L ammonium chloride-50% absolute ethanol extract to fully carry out the exchange reaction; collect the exchange solution and add 35% of the neutral formaldehyde is condensed with the residual ammonium ion in the exchange solution to form formic acid, and then immediately titrated with 0.1 mol / L sodium hydroxide standard solution. The amount of ammonium ion consumed in the exchange solution is Is the corresponding exchangeable cation amount. Cation exchange capacity refers to the K absorbed under the condition of pH 7 + , Na + , Ca 2+ , Mg 2+ The total amount of cations is called CEC for short. 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, swelling and dispersing ability; on the contrary, the worse its hydrat...

Embodiment 3

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

[0038] Organic modification of bentonite: Use dodecyltrimethylammonium bromide as the modifier to organically modify sodium bentonite. Follow the steps below:

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

[0040] 2. Add 10g of sodium bentonite into the above-mentioned dodecyltrimethylammonium bromide solution to prepare a 10% suspension, and stir and heat it in a water bath at 70°C for 3h. 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. The bentonite obtained by centrifugation is repeatedly washed, dried at 70°C, activated at 105°C for 2 hours, and ground 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 specifically relates to a detoxification method for lignocellulosic sugar hydrolyzed liquid. Background technique [0002] With the depletion of petroleum resources, the research on the production of bio-energy and chemicals from lignocellulosic materials has become a research focus in recent years. Lignocellulose mainly includes three components: cellulose, hemicellulose and lignin. One way to use lignocellulosic raw materials is to degrade cellulose and hemicellulose into sugars, which are then fermented into ethanol or other chemicals. The cellulose, hemicellulose and lignin in the lignocellulosic raw materials are tightly combined and are difficult to be hydrolyzed by cellulase. Therefore, pretreatment is required before enzymatic hydrolysis to increase the accessibility of cellulose to enzymes in the raw materials, thereby increasing the enzymes Hydrolys...

Claims

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Application Information

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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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