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Two-step hydrolysis method for preparing reducing sugars with cellulose

A cellulose dissolving and cellulose technology, applied in the production of sugar, sugar production, glucose production, etc., can solve the problems of large amount of liquid inorganic acid, high cost of enzymatic hydrolysis, difficult separation of hydrolyzed products, etc. The effect of less amount, mild hydrolysis conditions and simple subsequent treatment

Active Publication Date: 2012-09-26
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems of large amount of liquid inorganic acid, high cost of enzymatic hydrolysis, complicated preparation of solid acid catalyst, poor selectivity of supercritical water hydrolysis and difficult separation of hydrolyzate in the prior art, the present invention provides a two-step method for preparing reducing sugar from cellulose Hydrolysis

Method used

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  • Two-step hydrolysis method for preparing reducing sugars with cellulose
  • Two-step hydrolysis method for preparing reducing sugars with cellulose

Examples

Experimental program
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Effect test

Embodiment 1

[0040] 12.5g of ionic liquid (1-ethyl-3-methylimidazole chloride salt) is heated to 90℃, stirred for 15min to melt, then 2.5g of cellulose is added, stirred for 30min to obtain a cellulose solution, and 0.5g of the first catalyst is added under stirring Amberlyst A-15, 0.75g water, perform the first hydrolysis at 90℃ for 15min to obtain the hydrolysate, add 200mL of precipitant isobutanol to the hydrolysate to precipitate cellulose oligomers, filter and wash the obtained cellulose oligomers The material was placed in 40 mL of water, 1 g of the second catalyst Amberlyst A-15 was added, and the second step of hydrolysis was carried out at 160° C. for 2 h. The yield of reducing sugar determined by DNS method reached 70.4%.

Embodiment 2

[0042] 12.5g of ionic liquid (1-ethyl-3-methylimidazole chloride salt) was heated to 90℃, stirred for 15min to melt, then 2.5g of cellulose was added, stirred for 30min to obtain a cellulose solution, and 0.5g of the first catalyst was added under stirring Amberlyst A-15, 0.75g of water, conduct the first hydrolysis at 90℃ for 25min to obtain the hydrolysate, add 200mL of precipitant isobutanol to the hydrolysate to precipitate cellulose oligomers, filter and wash the obtained cellulose oligomers The material was placed in 40 mL of water, 1 g of the second catalyst Amberlyst A-15 was added, and the second step of hydrolysis was carried out at 160° C. for 2 h. The yield of reducing sugar determined by DNS method reached 76.8%.

Embodiment 3

[0044] 12.5g of ionic liquid (1-ethyl-3-methylimidazole chloride salt) was heated to 90℃, stirred for 15min to melt, then 2.5g of cellulose was added, stirred for 30min to obtain a cellulose solution, and 0.5g of the first catalyst was added under stirring Amberlyst A-15, 0.75g of water, conduct the first hydrolysis at 90℃ for 35min to obtain the hydrolyzed liquid, add 200mL of precipitant isobutanol to the hydrolyzed liquid to precipitate cellulose oligomers, filter and wash the obtained cellulose oligomers The material was placed in 40 mL of water, 1 g of the second catalyst Amberlyst A-15 was added, and the second step of hydrolysis was carried out at 160° C. for 2 h. The yield of reducing sugar determined by DNS method reached 81.4%.

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Abstract

The invention discloses a two-step hydrolysis method for preparing reducing sugars with cellulose, comprising the following steps: step (1) of dissolving the cellulose into a solvent to obtain a cellulose solution; in the cellulose solution, enabling the cellulose to contact water by the action of a first catalyst to perform a first-step hydrolysis and obtain hydrolysate; adding a precipitator into the hydrolysate, and separating after precipitating to obtain precipitate; step (2) of adding a second catalyst in the precipitate obtained in the step (1) by utilizing water as a medium to perform a second-step hydrolysis and obtain the reducing sugars, wherein productivity of the reducing sugars reaches 40-85%. The invention further discloses application of the two-step hydrolysis method for preparing reducing sugars with cellulose in fermentation and preparation for compounds such as ethanol, lactic acid and so on in the carbohydrate industry. Cellulose solvent, catalyst and precipitator utilized by the invention can effectively separated and used repeatedly; hydrolysis condition is relatively mild; dosage of acid catalysts is less; and the method is featured with simple operation, low energy consumption, fast reaction and high productivity.

Description

Technical field [0001] The invention relates to a cellulose hydrolysis method, in particular to a two-step hydrolysis method for preparing reducing sugars from cellulose. Background technique [0002] With the increasingly prominent energy and environmental issues, effective use of biomass materials has become one of the hotspots of research today. Currently, raw materials such as corn starch, sugar cane and sugar beets are used to produce fuel ethanol. However, due to limited farmland suitable for these crops and competition with human and animal food chains, the use of these biomass materials is not sustainable. Cellulose is the most abundant natural renewable resource on the planet, with an annual output of more than 100 billion tons, exceeding the existing petroleum reserves. Realizing the replacement of petrochemical resources with cellulose to obtain chemical products and fuels is a strategic requirement to ensure national resource and energy security . [0003] Cellulose ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C13K1/02C13K13/00
Inventor 倪金平王海量朱锦
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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