Method for producing hemicellulose by treating straw by ammonia water steam explosion technology
A hemicellulose and technical treatment technology, applied in the field of biomass pretreatment, can solve the problems of long pretreatment time and production cycle, large environmental impact, limited application, etc. Effect
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Embodiment 1
[0028] A method for preparing hemicellulose from straw by using ammonia steam explosion technology, the steps are as follows:
[0029] 1) Crush the straw into straw powder with a particle size of 100 mesh sieve;
[0030] 2) In the steam explosion reaction kettle, add straw powder and ammonia solution with a concentration of 1% by weight in sequence, and the dosage ratio is 1g:15ml;
[0031] 3) Start the steam blaster, control the reaction temperature to 160°C, and hold the pressure at 0.6MPa for 10 minutes before blasting;
[0032] 4) Take out the explosive waste, filter it, dry it, and store it in a sealed container to obtain the pretreated straw raw material;
[0033] 5) Mix the pretreated straw raw material and NaOH solution with a concentration of 10% by weight evenly, and the dosage ratio is 1g:75ml to obtain a mixture;
[0034] 6) The above mixture was reacted at 50°C for 2 hours, and the filtrate was obtained after filtration;
[0035] 7) Adjust the pH of the filtrat...
Embodiment 2
[0039] A method for preparing hemicellulose from straw by using ammonia steam explosion technology, the steps are as follows:
[0040] 1) Crush the straw into straw powder with a particle size of 100 mesh sieve;
[0041] 2) In the steam explosion reaction kettle, add straw powder and ammonia solution with a concentration of 10% by weight in sequence, and the dosage ratio is 1g:150ml;
[0042] 3) Start the steam blaster, control the reaction temperature to 140°C, and hold the pressure at 0.4MPa for 40 minutes before blasting;
[0043] 4) Take out the explosive waste, filter it, dry it, and store it in a sealed container to obtain the pretreated straw raw material;
[0044] 5) Mix the pretreated straw raw material and NaOH solution with a concentration of 5% by weight evenly, and the dosage ratio is 1g:50ml to obtain a mixture;
[0045] 6) The above mixture was reacted at 90°C for 2 hours, and the filtrate was obtained after filtration;
[0046] 7) Adjust the pH of the filter...
Embodiment 3
[0050] A method for preparing hemicellulose from straw by using ammonia steam explosion technology, the steps are as follows:
[0051] 1) Crush the straw into straw powder with a particle size of 100 mesh sieve;
[0052] 2) In the steam explosion reaction kettle, add straw powder and ammonia solution with a concentration of 1% by weight in sequence, and the dosage ratio is 1g:100ml;
[0053] 3) Start the steam blaster, control the reaction temperature to 140°C, and hold the pressure at 0.4MPa for 60 minutes before blasting;
[0054] 4) Take out the explosive waste, filter it, dry it, and store it in a sealed container to obtain the pretreated straw raw material;
[0055] 5) uniformly mixing the pretreated straw raw material and a 25% NaOH solution by weight to obtain a mixture;
[0056] 6) The above mixture was reacted at 40°C for 2 hours, and the filtrate was obtained after filtration;
[0057] 7) Adjust the pH of the filtrate obtained by filtration to 7.0, and add absolute ...
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