Method for preparing maleylation hemicellulose
A technology of hemicellulose and maleylation, which is applied in the field of preparation of maleylated hemifiber, can solve the problems of hemicellulose that have not yet been seen, and achieve the effect of improving hydrophobicity, increasing output and reducing production cost
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Embodiment 1
[0032] The maleylated hemicellulose of the present embodiment, its preparation method comprises the steps:
[0033] Step 1: add 50 g of ground yellow bamboo and 75 g of sodium chlorite into 1000 ml of water, heat at 75° C. for 2 hours, adjust the pH value of the system to 3.8 with acetic acid, and obtain delignified yellow bamboo; use 10 wt % KOH at 23 Extract the above-mentioned delignified yellow bamboo for 10 hours at ℃, and the dosage ratio of delignified yellow bamboo to KOH solution is 1:20g·ml -1 , the resulting filtrate was adjusted to pH 5.5 with 6 mol / l acetic acid, then precipitated with 95% ethanol 3 times the volume of the filtrate, filtered, washed with 70% acidified ethanol, and freeze-dried at -50°C for 48 hours to obtain purified semi cellulose;
[0034] Step 2: Put 150g of ionic liquid 1-butyl-3-methylimidazolium chloride into a 500ml three-necked reaction flask, blow nitrogen gas, and dissolve at 90°C. Add 3.85g of purified hemicellulose into the dissolved...
Embodiment 2
[0038] The maleylated hemicellulose of the present embodiment, its preparation method comprises the steps:
[0039] Step 1: Add 50 g of ground yellow bamboo and 75 g of sodium chlorite into 1000 ml of water, heat at 75° C. for 2 hours, adjust the pH value of the system to 3.8 with acetic acid, and obtain delignified yellow bamboo; use 10 wt % KOH at 20 Extract the above-mentioned delignified yellow bamboo for 10 hours at ℃, and the dosage ratio of delignified yellow bamboo to KOH solution is 1:20g·ml -1 , the resulting filtrate was adjusted to pH 5.5 with 6 mol / l acetic acid, then precipitated with 95% ethanol 3 times the volume of the filtrate, filtered, and the filter residue was collected, washed with 70% acidified ethanol, freeze-dried at -50°C for 48 hours, and purified of hemicellulose;
[0040] Step 2: Put 150g of ionic liquid 1-butyl-3-methylimidazolium chloride in a 500ml three-necked reaction flask, blow nitrogen gas, and dissolve at 90°C; add 3.00g of purified hemi...
Embodiment 3
[0044] The maleylated hemicellulose of the present embodiment, its preparation method comprises the steps:
[0045]Step 1: Add 50 g of ground yellow bamboo and 75 g of sodium chlorite into 1000 ml of water, heat at 75° C. for 2 hours, adjust the pH value of the system to 3.8 with acetic acid, and obtain delignified yellow bamboo; use 10 wt % KOH at 20 Extract delignified yellow bamboo at ℃ for 10 hours, and the dosage ratio of delignified yellow bamboo to KOH solution is 1:25g·ml -1 , the obtained filtrate was adjusted to pH 5.5 with 6 mol / l acetic acid, then precipitated with 95% ethanol of 3 times the volume of the filtrate, collected the filter residue after filtration, washed with 70% acidified ethanol, and freeze-dried at -50°C for 48h to obtain Purified hemicellulose;
[0046] Step 2: Put 150g of ionic liquid 1-butyl-3-methylimidazolium chloride in a 500ml three-necked reaction flask, blow nitrogen gas, and dissolve at 90°C; add 6.0g of purified hemicellulose into the d...
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