Method for preparing glucose by catalyzing hydrolysis of cellulose by low-solubility organic acid
A low-solubility, cellulose-based technology, applied in glucose production, sugar production, sugar production, etc., can solve the problems of difficult separation of main product glucose and organic acid, low reaction efficiency, long hydrolysis time, etc., to shorten the hydrolysis time , low content of by-products, and improved efficiency
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Embodiment 1
[0021] Avicel and DNBA were added to water according to the ratio shown in Table 1, and reacted at different temperatures for 2 hours. After filtration, the filtrate is used for glucose analysis and detection, and the residue is used for further hydrolysis. The details are shown in Table 1.
[0022] Table 1 Comparison of the hydrolysis effects of DNBA on microcrystalline cellulose at different temperatures
[0023]
[0024] It can be seen from Table 1 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.
Embodiment 2
[0026] Avicel and DNBA were added to water according to the ratio shown in Table 2, and hydrolyzed at 190° C. for different times. After filtration, the filtrate is used for glucose analysis and detection, and the residue is used for further hydrolysis. The details are shown in Table 2.
[0027] Table 2 Comparison of the hydrolysis effects of DNBA on microcrystalline cellulose under different hydrolysis times
[0028]
[0029]
[0030] 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 ...
Embodiment 3
[0032] Add microcrystalline cellulose and DNBA to water according to the ratio shown in Table 3, and hydrolyze at 190° C. for 1 h. After filtration, the filtrate is used for glucose analysis and detection, and the residue is used for further hydrolysis. The details are shown in Table 3.
[0033] It can be seen from Table 3 that with the increase of cellulose dosage, the glucose yield showed a downward trend, while the glucose concentration showed a rapid upward trend. The higher the concentration of glucose in the hydrolyzate, the more conducive to the operation steps such as the concentration of the subsequent fermentation process. Therefore, when the concentration of the cellulose raw material is controlled at 5-10%, both the glucose yield and the glucose concentration can be higher.
[0034] Table 3 DNBA compares the hydrolysis effects of different concentrations of microcrystalline cellulose
[0035]
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