Preparation method of ionic liquid for efficiently extracting cellulose and application thereof
An ionic liquid and cellulose technology, applied in the preparation of carboxylate, fiber raw material processing, organic chemistry, etc., can solve the problems of low utilization rate, unfavorable energy utilization, etc., and achieve high conversion rate, simple preparation method, and favorable regeneration. Effect
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[0020] A preparation method of an ionic liquid for efficiently extracting cellulose, the steps are as follows:
[0021] 1) Preparation of intermediate 1-allyl-3-methylimidazolium bromide:
[0022] Add 37.5mL of N-methylimidazole into a closed three-necked flask, place the three-necked flask in an ice bath, vacuumize and fill with nitrogen three times, then add 50.0mL of 3-bromopropene dropwise into the three-necked flask, react for 4 hours, keep The temperature of the system is 30-50°C and the reaction is continued for 8 hours to obtain a light yellow viscous liquid, which is then -2 -10 -1 Carry out underpressure distillation under the vacuum degree of Mpa to remove unnecessary 3-bromopropene, then use ether extraction three times to remove remaining N-methylimidazole, obtain intermediate 1-allyl-3-methylimidazolium bromide;
[0023] 2) Configure lead acetate aqueous solution:
[0024] Dissolve 141.33g of lead acetate in 200.0mL of water to obtain a 26.5% lead acetate aque...
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