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Choline chloride eutectic solvent as well as preparation method and application thereof

A low eutectic solvent, choline chloride technology, applied in the production of bulk chemicals, etc., can solve the problems of single type of hydrogen bond acceptor, limited application scope, difficult to meet production needs, etc., and achieves polymerization degree and thermal stability. Small, improved accessibility, low environmental impact

Pending Publication Date: 2021-10-01
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the types of hydrogen bond donors and hydrogen bond acceptors currently used in the synthesis of DESs are relatively single, which further limits its application range and is difficult to meet different production needs.

Method used

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  • Choline chloride eutectic solvent as well as preparation method and application thereof
  • Choline chloride eutectic solvent as well as preparation method and application thereof
  • Choline chloride eutectic solvent as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0034] Embodiment 1: the preparation of choline chloride deep eutectic solvent

[0035] In the present embodiment, the choline chloride deep eutectic solvent is prepared as a hydrogen bond donor with alcohols, and the alcohols are any one of ethylene glycol, glycerol, propylene glycol, sorbitol, xylitol, and ethyl Glycol is example, and preparation obtains ChCl / ethylene glycol, and concrete steps are as follows:

[0036] Firstly, the raw materials are dried, especially ChCl should be dried in an oven for 4-6 hours before the experiment, and then choline chloride and ethylene glycol are evenly mixed in a beaker (the molar ratio is 1:2), at 100 ℃ Stir continuously until a uniform transparent liquid is formed, then take it out, cool to room temperature, and finally store the prepared DES in a vacuum desiccator for future use.

[0037] figure 1 (a) is the infrared spectrum of ChCl / ethylene glycol. from figure 1 (a) It can be seen that ethylene glycol at 3293cm -1 The absorpti...

Embodiment 2

[0038] Embodiment 2: the preparation of choline chloride deep eutectic solvent

[0039]In the present embodiment, the choline chloride deep eutectic solvent is prepared with phenols as hydrogen bond donors, and the phenols are any one of phenol, p-cresol, resorcinol, hydroquinone, etc., Taking hydroquinone as an example to prepare ChCl / hydroquinone, the specific preparation steps are basically the same as in Example 1, except for the following difference: the hydrogen bond donor is hydroquinone.

[0040] figure 1 (b) is the infrared spectrum of ChCl / hydroquinone, from figure 1 In (b), it can be seen that hydroquinone at 3281cm -1 The absorption band broadens and moves down to 3255 cm -1 ; The characteristic spectrum of hydroquinone asC=C and δCH are from (1517cm -1 、1475 cm -1 ) and (832 cm -1 、759 cm -1 ) down to (1510 cm -1 、1457 cm -1 ) and (829 cm -1 、758 cm -1 ), all indicate that there is a hydrogen bond between hydroquinone and choline chloride.

Embodiment 3

[0041] Embodiment 3: the preparation of choline chloride deep eutectic solvent

[0042] In the present embodiment, the choline chloride deep eutectic solvent is prepared with amines as hydrogen bond donors, and the amines are any one of urea, thiourea, acetamide, ethanolamine, triethanolamine, etc., with urea as For example, to prepare ChCl / urea, the specific preparation steps are basically the same as in Example 1, except for the following difference: the hydrogen bond donor is urea.

[0043] figure 1 (c) is the infrared spectrum of ChCl / urea, from figure 1 (c) It can be seen that ChCl / urea at 3443cm -1 and 3350cm -1 Compared with the hydroxyl peak of urea, the absorption band of urea is broadened, and the sNH of urea 2 and δNH 2 The characteristic peak bands are from 1684cm -1 and 1623 cm -1 Move down to 1668 cm -1 and 1620 cm -1 , indicating that there is hydrogen bonding between the two components in ChCl / urea.

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Abstract

The invention provides a choline chloride eutectic solvent and a preparation method and application thereof, and belongs to the technical field of ionic liquid application. In the invention, choline chloride (ChCl) and a hydrogen bond donor are polymerized by adopting a direct heating method to obtain the choline chloride eutectic solvent; the choline chloride deep eutectic solvent has little influence on the environment, is easy to synthesize, has little influence on the crystal structure, polymerization degree and thermal stability of microcrystalline cellulose, and can be well applied to the field of non-dissolving pretreatment microcrystalline cellulose.

Description

technical field [0001] The invention belongs to the technical field of ionic liquid applications, and in particular relates to a choline chloride deep eutectic solvent and a preparation method and application thereof. Background technique [0002] Microcrystalline cellulose (MCC) is a chain polymer composed of glucose units bound by β-(1,4)-glycosidic bonds, which is difficult to be hydrolyzed into fermentable sugars and converted into value-added chemicals. At present, microcrystalline cellulose is pretreated to reduce and overcome the refractory nature of biomass, and promote the hydrolysis of cellulose into glucose for fuel ethanol production. Pretreatment of microcrystalline cellulose with ionic liquids (ILs) is a feasible method. ILs can loosen the structure of microcrystalline cellulose and facilitate subsequent catalysis and processing. [0003] Ionic liquids (ILs) refer to organic salt liquids with melting points below 100 °C, which have unique physicochemical prope...

Claims

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Application Information

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IPC IPC(8): C08J3/09C08B15/02C08L1/04
CPCC08J3/096C08B15/02C08J2301/04Y02P20/54
Inventor 黄文睿韩娟王赟吴嘉聪王蕾李媛媛唐超凡
Owner JIANGSU UNIV
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