Process for effectively hydrolyzing cellulose in ion liquid
An ionic liquid, a technology for dissolving cellulose, applied in the field of high-efficiency hydrolysis of cellulose, can solve the problems of troublesome post-processing of hydrolyzate, strong corrosiveness of concentrated acid, difficult recovery, etc., and achieves easy tracking and control, low corrosion resistance requirements , the effect of simple process
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[0020] Example 1
[0021] Add 4 g of ionic liquid BMImCl into a 10 ml round bottom flask, heat to 100°C, slowly add 0.32 g under vigorous stirring Cellulose (Sigma Company, product number: S6790), stir until all the cellulose is dissolved, and the solution is a clear amber homogeneous system. At this time, 0.063 g of water and 0.148 g of concentrated sulfuric acid (98 wt%) were mixed and quickly added to the solution, and reacted at 100° C. for a certain period of time under normal pressure. When the reaction is over, the reaction is quenched with cold water, and the pH value of the reaction solution is adjusted to 7.0 with 0.5 mol / L NaOH. The resulting hydrolysate is measured for glucose content with a glucose analyzer, and the total reducing sugar content is measured with DNS method. This method reacts for 28 minutes and 45 minutes, and the corresponding reducing sugar yields are 66% and 62%, respectively, and the corresponding glucose yields are 28% and 38%, respectively.
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[0022] Examples 2~3:
[0023] Other process conditions and experimental procedures are the same as in Example 1, but using concentrated sulfuric acid (98wt%) of different quality as the catalyst, the reaction was quenched at different times. The results are shown in Table 1.
[0024] Table 1 Results of cellulose hydrolysis reaction catalyzed by different quality catalyst
[0025] Item
Example
[0026] Examples 4 to 5:
[0027] Other process conditions and experimental steps are the same as in Example 1, but using different quality Cellulose was sampled and analyzed at different times. The hydrolysis results are shown in Table 2. It is proved that under the condition that the cellulose can be fully dissolved, the dissolution amount has no obvious influence on the hydrolysis result.
[0028] Table 2 The influence of the amount of cellulose dissolved in ionic liquid on the result of hydrolysis reaction
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