Comprehensive utilization method of lignocellulose biomass
A lignocellulose and biomass technology, applied in the field of comprehensive utilization of cellulose, hemicellulose and lignin in lignocellulosic biomass, can solve the problem that high activity, high hemicellulose and cellulose extraction rate cannot be obtained at the same time, etc. problems, to achieve the effect of protecting from being destroyed, improving the extraction rate and reducing the inhibitory effect
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Embodiment 1
[0076] (1) N-level acid hydrolysis
[0077] In this embodiment: what adopt is three-stage acid hydrolysis, at first corn cob is smashed, washes with water to remove dust. Set the first reactor as the first stage, and the last one as the third stage, add the newly prepared acid solution into the first stage hydrolysis reaction kettle, and add the acid solution discharged from the first stage acid hydrolysis reaction kettle into the second stage In the acid hydrolysis reactor, the acid solution discharged from the second-stage acid hydrolysis reactor is added into the third-stage acid hydrolysis reactor, and the solution discharged from the third-stage acid hydrolysis reactor is the final pentose solution, and then the first-stage acid The acid hydrolysis residue in the hydrolysis reactor is discharged and put into new corncob raw material, which is used as the third-stage acid hydrolysis reactor, and the original second-stage acid hydrolysis reactor is used as the first-stage a...
Embodiment 2
[0095] (1) N-level acid hydrolysis
[0096] The raw material and method are the same as Example 1 step (1), the difference is that the temperature of the first-stage acid hydrolysis is 135°C, the temperature of the second-stage acid hydrolysis is 120°C, and the temperature of the third-stage acid hydrolysis is 105°C; The weight of acid hydrolysis residue obtained is 2.03×10 3 kg (the water content is about 65%, the absolute dry content of hemicellulose is 13.92%, the absolute dry content of cellulose is 49.02%, and the absolute dry content of lignin is 32.64%), and the final pentose sugar solution is 7.97 × 10 3 kg, and the concentration of pentose sugar is 3.04%, the extraction rate of hemicellulose is 71%.
[0097] (2) Extraction of alkali lignin with alkaline solution
[0098] Mix the acid hydrolysis residue obtained in step (1) of this example with sodium hydroxide solution, wherein the liquid-solid volume ratio is 10:1, and the concentration of sodium hydroxide is 3%, t...
Embodiment 3
[0106] (1) N-level acid hydrolysis
[0107] Raw material and method are with embodiment 1 step (1), and difference is that the concentration of phosphoric acid solution in every stage reactor is 10%, and the time of every stage acid hydrolysis is 2 hours, and the temperature of first stage acid hydrolysis is 100 ℃, The temperature of the second-stage acid hydrolysis is 95°C, and the temperature of the third-stage acid hydrolysis is 90°C; the weight of the finally obtained acid hydrolysis residue is 2.1×10 3 kg (the water content is about 65%, the absolute dry content of hemicellulose is 13.94%, the absolute dry content of cellulose is 48.74%, and the absolute dry content of lignin is 33.04%), and the final pentose sugar solution is 7.9 × 10 3 kg, and the concentration of pentose sugar is 3.02%, the extraction rate of hemicellulose is 70%.
[0108] (2) Extraction of alkali lignin with alkaline solution
[0109] All the acid hydrolysis residues obtained in step (1) of this emb...
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