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A kind of weak polar acid two-liquid phase catalyzed method for preparing glucose by hydrolysis of cellulose

A weak polarity and cellulose technology, applied in the field of glucose, can solve the problems of long hydrolysis time, low reaction efficiency, and difficult separation of catalyst and residue, and achieve high hydrolysis efficiency, low content of by-products, and shorten the hydrolysis time.

Active Publication Date: 2015-10-14
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of solid acid to hydrolyze cellulose has disadvantages such as difficult separation of catalyst and residue, long hydrolysis time, and low reaction efficiency, which limit the practical application of the above two acids

Method used

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  • A kind of weak polar acid two-liquid phase catalyzed method for preparing glucose by hydrolysis of cellulose
  • A kind of weak polar acid two-liquid phase catalyzed method for preparing glucose by hydrolysis of cellulose
  • A kind of weak polar acid two-liquid phase catalyzed method for preparing glucose by hydrolysis of cellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 2% microcrystalline cellulose and 1% weakly polar catalyst into water, solvent ratio (non-polar: water) = 1:2, and hydrolyze at 190°C for 1 hour. Glucose was detected, and the comparison of the hydrolysis effect of the weak polar acid catalyst on microcrystalline cellulose is shown in Table 1.

[0020] Table 1

[0021]

[0022] It can be seen from Table 1 that the type of acid catalyst has a significant impact on the yield of glucose, and phthalic acid can obtain better results.

Embodiment 2

[0024] Add 2% microcrystalline cellulose and 1% phthalic acid into water, solvent ratio (non-polar: water) = 1:2, and hydrolyze at different temperatures for 2 hours. Glucose was detected, and the comparison of hydrolysis effects of phthalic acid on microcrystalline cellulose at different temperatures is shown in Table 2.

[0025] Table 2

[0026]

[0027] It can be seen from Table 2 that the hydrolysis temperature has a significant effect on the glucose yield. When the temperature is lower than 190℃, the yield of glucose increases with the increase of hydrolysis temperature; when the temperature is higher than 190℃, the yield of glucose tends to decrease. It shows that at a higher temperature, the conversion of the product glucose into hydroxymethylfurfural and other by-products is enhanced, which makes the glucose yield decrease instead. The solvent ratio had a significant effect on the glucose yield. When the water solvent is completely used, the glucose yield is rela...

Embodiment 3

[0029] Add 2% microcrystalline cellulose and 1% phthalic acid into water, hydrolyze at 190°C for different times, solvent ratio (non-polar: water) = 1:2. Glucose was detected, and the comparison of hydrolysis effects of phthalic acid on microcrystalline cellulose under different hydrolysis times is shown in Table 3.

[0030] table 3

[0031]

[0032] It should be pointed out that it takes about 40 minutes for the reaction system to heat up from room temperature to the target temperature, and the heating process is not included in the hydrolysis reaction time. Therefore, when the hydrolysis time is 0 h, the glucose yield is greater than zero. It can be seen from Table 2 that when hydrolyzed at 190°C, the glucose yield basically reached the maximum at 1 h, and the increase in the glucose yield was limited when the reaction time was prolonged, and even the glucose degraded and the final yield decreased. At the same time, for the consideration of reducing energy consumption, t...

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Abstract

The invention discloses a method for preparing glucose by using weak-polarity acid to catalyze hydrolysis of cellulose in double liquid phases. The method comprises the following steps: putting water, a cellulose raw material, a non-polar solvent and a weak-polarity acid catalyst into a reaction kettle to obtain a mixed solution; hydrolyzing the obtained mixed solution, and separating the water phase to obtain a glucose solution, wherein a non-polar phase is the non-polar solvent and the residual weak-polarity acid, and filter residue is the cellulose raw material which is not hydrolyzed; and replenishing water into the non-polar phase and the filter residue, and then hydrolyzing and separating repeatedly. The reaction conditions are gentle, energy consumption is low, the content of byproducts in the hydrolysis products is low, and a subsequent fermentation reaction is beneficial to be performed for preparing ethanol. The method has the advantage that the hydrolysis products and the catalyst are easy to separate. The efficiency of the hydrolysis reaction is greatly improved, and the hydrolysis time is shortened. The weak-polarity acid and the cellulose raw material are fully utilized. The hydrolysis residues mainly comprise the cellulose and lignin which are not hydrolyzed, and the like, hydrolysis can be continued after the water is added and the catalyst is recycled, and fresh cellulose raw material can be replenished if necessary so as to perform hydrolysis again.

Description

technical field [0001] The invention relates to glucose, in particular to a method for preparing glucose by catalyzing cellulose hydrolysis with a class of weak polar acids in a two-liquid phase system. Background technique [0002] The production of bioethanol is one of the main methods of biomass resource conversion and utilization, and the key step is how to hydrolyze the cellulose or hemicellulose in the fiber raw material into fermentable sugars. Compared with cellulase hydrolysis, the acid-catalyzed hydrolysis process has the advantages of low cost and easy control of reaction conditions, but there are also disadvantages in the acid-catalyzed hydrolysis process, including high equipment requirements, difficult wastewater treatment, complex hydrolyzed products, and difficult separation of catalysts. place. In order to solve the problem of complex products in the acid hydrolysis process, some researchers proposed to use organic acids such as formic acid or maleic acid t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C13K1/02
Inventor 刘健龙敏南甘礼惠
Owner XIAMEN UNIV
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