Acidolysis processing method for improving comprehensive utilization of lignocellulose biomass
A lignocellulose and treatment method technology, applied in the field of multi-stage acid hydrolysis treatment, can solve the problems of high destruction rate of hemicellulose lignin and cellulose, low utilization rate of hemicellulose, etc., to reduce energy consumption and shorten operation Time, the effect of maintaining activity
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Embodiment 1
[0028] Using tertiary acid hydrolysis, first crush the corn cob (mass composition: moisture 6.12%, cellulose 35.19%, hemicellulose 32.1%, lignin 23.7%, other 2.95%, the same below), washed with water to remove dust . Set one of the reactors as the first stage and the last as the third stage. Add the newly prepared acid solution to the first-stage hydrolysis reactor, adjust the concentration of the acid solution discharged from the first-stage acid hydrolysis reactor, and then Add it to the second-stage acid hydrolysis reactor to adjust the concentration of the acid solution discharged from the second-stage acid hydrolysis reactor, and then add it to the third-stage acid hydrolysis reactor, and the third-stage acid hydrolysis reactor discharges The solution is the final pentose solution, and then the acid hydrolysis residue in the first-stage acid hydrolysis reactor is discharged, and new corncob raw materials are loaded into it, which is used as the third-stage acid hydrolysis ...
Embodiment 2
[0038] The method is the same as in Example 1. The difference is that the temperature of each stage of acid hydrolysis is 120°C, and the concentration of the acid solution gradually decreases from the first stage to the third stage by 40% of the concentration of the first stage acid solution. In this way, the concentration of the phosphoric acid solution in the first-stage acid hydrolysis is 20%, the concentration of the phosphoric acid solution in the second-stage acid hydrolysis is 12%, and the concentration of the phosphoric acid solution in the third-stage acid hydrolysis is 4%; the weight of the acid hydrolysis residue is finally obtained 1.82×10 3 kg (water content is about 65%, the absolute dry content of hemicellulose is 5.88%, the absolute dry content of cellulose is 53.63%, and the absolute dry content of lignin is 35.08%), the weight of the pentose solution is 8.29×10 3 kg, the pentose concentration is 3.62%, and the extraction rate of hemicellulose is 90%.
Embodiment 3
[0040] The method is the same as in Example 1. The difference is that the concentration of the acid solution from the first stage to the third stage is gradually reduced by 30% of the concentration of the first stage acid solution, so that the concentration of the first stage acid hydrolyzed phosphoric acid is 10%, the concentration of the second-stage acid-hydrolyzed phosphoric acid is 7%, and the concentration of the third-stage acid-hydrolyzed phosphoric acid is 4%, the time of each stage of acid hydrolysis is 2 hours, and the temperature is 140℃; the final weight of the acid hydrolysis residue is 1.79×10 3 kg (water content is about 65%, the absolute dry content of hemicellulose is 8.72%, the absolute dry content of cellulose is 52.70%, the absolute dry content of lignin is 33.56%), the weight of the pentose solution is 8.21×10 3 kg, the pentose concentration is 3.49%, and the extraction rate of hemicellulose is 84%.
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