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

Inactive Publication Date: 2012-11-28
NANKAI UNIV
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Problems solved by technology

The treatment methods of direct combustion and landfill are outside the pollution envi...

Method used

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Embodiment

[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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Abstract

The invention relates to a preparation method of an ionic liquid for efficiently extracting cellulose, which comprises the following steps: reacting raw materials N-methylimidazole and 3-bromopropylene in a nitrogen protective atmosphere to synthesize 1-allyl-3-methylimidazolyl bromine salt; mixing the 1-allyl-3-methylimidazolyl bromine salt and a lead acetate water solution to react, thereby obtaining a 1-allyl-3-methylimidazolyl acetate water solution and a lead bromide precipitate; and after freeze-drying to remove the lead bromide, extracting the 1-allyl-3-methylimidazolyl acetate water solution with ethyl acetate, and carrying out vacuum distillation and acetone extraction to obtain the ionic liquid which can be used for extracting cellulose and can be recycled for repeated use. The preparation method is simple, does not use any organic solvent, and has the advantages of high conversion rate, no toxicity and no pollution; and the ionic liquid has the advantages of high solubility, high solution rate, low temperature requirement and lower viscosity under the condition of dissolving the same mass of cellulose, and is beneficial to cellulose regeneration and after treatment.

Description

technical field [0001] The invention relates to the technical field of environmental chemical industry, in particular to a preparation method and application of an ionic liquid for efficiently extracting cellulose. Background technique [0002] Ionic liquids, also known as room temperature ionic liquids, room temperature molten salts, organic ionic liquids, designable solutions, etc., refer to salts that are only composed of cations and anions and are liquid at room temperature or low temperature. Ionic liquids have a series of outstanding physical and chemical properties, mainly including: 1) almost no vapor pressure, low melting point, non-volatile, non-flammable; 2) wide liquid temperature range, good thermal stability and wide electrochemical Stable potential window; 3) Good solubility, selective dissolution can be achieved by design; 4) Reusable, etc. Due to its outstanding advantages, as an emerging green solvent, ionic liquids have great potential and can be widely u...

Claims

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Application Information

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IPC IPC(8): C07D233/58C07C51/41C07C53/10D21C5/00
Inventor 王雁南鞠美庭李维尊李倩刘乐
Owner NANKAI UNIV
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