Synthetic method for basic ionic liquid

A technology of ionic liquid and synthesis method, applied in the direction of organic chemistry, can solve the problems of complex catalyst preparation, poor strength, impurity pollution, etc., achieve high catalytic efficiency and reusability, simple synthesis method, and easy separation

Inactive Publication Date: 2016-01-27
TIANJIN CAIYI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Traditional liquid base catalysts such as triethylamine and pyridine have high catalytic activity, but the catalyst and reaction products are not easy to separate
The solid base catalyzed reaction has the advantages of good selectivity and easy separation of products, but the preparation of the catalyst is complicated, expensive, poor in strength, and easily destroyed by CO in the atmosphere. 2 and H 2 O and other impurity pollution

Method used

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  • Synthetic method for basic ionic liquid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Step 1: Add N-methylimidazole and n-butane bromide into a three-necked flask at a molar ratio of 1:1.05, stir magnetically at 110°C, condense and reflux for 1 hour, and obtain a light yellow viscous liquid [Bmim]Br. The liquid crude product was washed 3 times with ethyl acetate, distilled under reduced pressure, added acetone, oscillated to dissolve, added a small amount of seed crystals, allowed to stand for 2-3 hours, and [Bmim]Br was crystallized, and the acetone was separated by suction filtration to obtain high-purity The intermediate [Bmim]Br was dried in a vacuum oven at 70°C until constant weight.

[0015] The second step: the synthesis of basic ionic liquid [Bmim]oH, take an appropriate amount of ionic liquid intermediate [Bmim]Br dissolved in 50ml of dichloromethane, add equimolar granular solid sodium hydroxide, stir at room temperature for 10h , remove the NaBr precipitate by suction filtration, remove the solvent by rotary evaporation at 40°C, and obtain th...

Embodiment 2

[0017] [Emim][Ac] can be obtained by changing the brominated alkanes bromobutane to bromoethane, and other steps and conditions remain unchanged.

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Abstract

The invention discloses a synthetic method for basic ionic liquid. The basic ionic liquid disclosed by the invention is synthesized in a salt exchange manner by adopting the two-step synthetic method. The synthetic method has the advantages that the basic ionic liquid not only has the advantages of inorganic base and is simple to operate, but also has the new characteristics of stability in water and air, easiness for separation and high catalytic efficiency and reusability; in the base catalysis process, a novel environmental-friendly base catalyst possibility is provided. The basic ionic liquid is easy to regulate, has no volatility or corrosivity and can be miscible with various organic solvents, and thus, the basic ionic liquid shows huge potential of replacing a conventional base catalyst and has important industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of ionic liquid materials, and in particular relates to a synthesis method of an alkaline ionic liquid. Background technique [0002] Ionic Liquids (ILs for short) are a class of salts composed entirely of organic cations and inorganic or organic anions with a melting point below 100 °C. The so-called ionic liquid is a room temperature ionic liquid, which is an electrolyte that becomes liquid at or below room temperature. Compared with traditional ionic compounds, it is liquid at room temperature; compared with traditional liquid substances, it is composed of anions and cations in structure. Therefore, ionic liquids have unique physical and chemical properties and have the prospect of replacing traditional environmentally unfriendly solvents. [0003] Room temperature ionic liquids include acidic, neutral and basic ionic liquids. Acidic and neutral ionic liquids are well known and successfully used in man...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D233/58
CPCC07D233/58
Inventor 王娜
Owner TIANJIN CAIYI TECH
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