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Room temperature ionic liquid and its preparation method

A room temperature ionic liquid and ionic liquid technology, applied in the field of room temperature ionic liquid and its preparation, can solve the problems of difficult separation and purification and low yield, and achieve the effect of simple synthesis method, high yield and mild reaction conditions

Inactive Publication Date: 2006-06-14
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the productive rate of this method is very low, and separation and purification are difficult

Method used

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  • Room temperature ionic liquid and its preparation method
  • Room temperature ionic liquid and its preparation method
  • Room temperature ionic liquid and its preparation method

Examples

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Embodiment 1

[0021] Example 1: N-methylimidazole and tributyl phosphate were mixed in a round bottom flask at a molar ratio of 1:1, and the flask was heated with an oil bath, and the temperature of the oil bath was 150° C. for 10 hours. After the reaction was over, it was cooled naturally. The reaction product was purified with diethyl ether. Because diethyl ether is miscible with N-methylimidazole and tributyl phosphate, but insoluble with the product. The product was washed several times with diethyl ether to ensure complete removal of N-methylimidazole and tributyl phosphate, and finally the diethyl ether was removed in vacuo. The yield of ionic liquid is 86.8%

Embodiment 2

[0022] Example 2: N-methylimidazole and tributyl phosphate were mixed uniformly in a round bottom flask at a molar ratio of 5:1. The round-bottomed flask was heated by an oil bath, and the oil bath temperature was 150° C. for 10 hours of reaction. After the reaction is over, let it cool down. Rotary vacuum evaporation under the condition of 150° C. in an oil bath, evaporated N-methylimidazole, and obtained an ionic liquid. It was verified by electrospray mass spectrometry that the product of this example was the same as that of Example 1.

Embodiment 3

[0023] Example 3, N-methylimidazole and tributyl phosphate were mixed uniformly in a round bottom flask at a molar ratio of 1:5. The round-bottomed flask was heated by an oil bath, and the oil bath temperature was 150° C. for 10 hours of reaction. After the reaction is over, let it cool down. Tributyl phosphate is insoluble in water, so water is added in the round-bottomed flask, separates oil layer, and the water layer that obtains evaporates water with rotary evaporator, obtains the ionic liquid identical with embodiment 1.

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Abstract

An ordinary-temp ion liquid, especially the phosphate-type ion liquid, used as the carrier of the acidic catalyst for the alkylation reaction of benzene features that its anion is alkyl phosphate. It is prepared by one-step reaction between tetraamine and alkyl phosphate.

Description

technical field [0001] The invention relates to a room temperature ionic liquid and a preparation method thereof, in particular to a phosphoric acid ester ionic liquid and a preparation method thereof, which can be used as a carrier of an acidic catalyst for the alkylation reaction of benzene. Background technique [0002] Ionic liquids refer to ionic compounds that are liquid in a large temperature range near room temperature. Because of their characteristics such as large liquid temperature range, wide dissolution range, extremely low vapor pressure, and good thermal stability, they are expected to become an important component of the process industry. An important green solvent. [0003] After nearly 20 years of research, the ionic liquid system has gradually grown, but it is basically composed of nitrogen-containing organic heterocyclic positive ions and inorganic negative ions. The cations involved include imidazole ring substituents [Rmim] + , pyridine ring substitut...

Claims

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Application Information

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IPC IPC(8): B01J31/22C07F9/6506
Inventor 李春喜于春影蒋小川王子镐
Owner BEIJING UNIV OF CHEM TECH
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