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Synthesis method of alkaline ionic liquid

A technology of ionic liquids and synthesis methods, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, etc., can solve problems such as impurity pollution, complex preparation of catalysts, and poor strength , to achieve the effects of easy separation, high catalytic efficiency and reusability, and simple synthesis method

Inactive Publication Date: 2016-12-07
天津龙腾翔科技有限公司
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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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  • Synthesis method of alkaline ionic liquid

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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 synthesis method of an alkaline ionic liquid. The alkaline ionic liquid is synthesized through salt exchange with a two-step synthesis method. The synthesis method has the advantages as follows: the alkaline ionic liquid has the advantages of inorganic base, is simple to operate, is stable in water and air and easy to separate and has new features of high catalysis efficiency and reusability, and a new and environment-friendly base catalyst is provided in the base catalysis process. Given that the alkaline ionic liquid is easy to adjust, doesn't have volatility or corrosiveness and can be mixed with a lot of organic solvents, the alkaline ionic liquid has huge potential for replacing a conventional base catalyst and has significant 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): C07D233/58B01J31/02
CPCC07D233/58B01J31/0282
Inventor 孙龙昌
Owner 天津龙腾翔科技有限公司
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