A method for one-step catalytic preparation of xylose from hemicellulose in corn stalks
A hemicellulose and xylose technology, applied in the field of biomass resource utilization, can solve the problems of not effectively utilizing cellulose and lignin, destroying cellulose and lignin, and affecting the purity of xylose, so as to solve environmental pollution and Waste of resources, low cost, and environmentally friendly effects
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Embodiment 1
[0029] Example 1: Influence of reaction temperature
[0030] 1. 6 groups of reactions were carried out under the same conditions except for different target temperatures. A 150 mL autoclave was charged with 4 g of corn stover powder and 100 mL of water. The reaction kettle was sealed, the air in the kettle was replaced with nitrogen, the initial pressure of nitrogen in the reaction kettle was adjusted to 2.0 MPa, and the stirring speed was maintained at 400 rpm. The reactor was heated uniformly from room temperature to the target temperature, ie 120-200°C, within 0.5h, and then kept at the target temperature for 2h. After the reaction was completed, the reaction was cooled by rapid rinsing with running water. After the reaction system was cooled to room temperature, the mixture in the reaction kettle was poured out, and the solid residue and the liquid product were obtained by suction filtration using filter paper for separation.
[0031] The solid residue was used to calcu...
Embodiment 2
[0038] Example 2: Effect of catalyst
[0039] The following 20 groups of reactions were carried out according to the methods of Group 10 and Group 11 in Example 1. The types of catalysts, reaction temperatures and results of each group are shown in Table 3. Because there are too many catalysts in the test, the reaction time of each group is 2h, only to show the effect of each group of catalysts, and the optimal reaction time is not shown. where H 2 SO 4 (pH=3.24) is a catalyst, and this pH value is the same as the pH value after 1 g of aluminum sulfate octadecahydrate is completely dissolved in 100 mL of water. with H 2 SO 4 (pH=1.35) is a catalyst, and this pH value is the same as the pH value of 1 g of aluminum sulfate octadecahydrate contained in 100 mL of water that is completely hydrolyzed to generate sulfuric acid.
[0040] Table 3 Response result table of each group
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[0043] As can be seen from Table 3, the yield of xylose obtained by using...
Embodiment 3
[0046] Example 3: Influence of Catalyst Amount
[0047] The reaction was carried out according to the method of Group 9 in Example 1, and the reaction time was 0.5 h, and 6 groups of reactions were carried out.
[0048] Table 4. Response results of each group
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[0050]
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