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1-ethyl-4-alkylpiperazine ionic liquid and preparation method and application thereof

A technology of alkylpiperazine and ionic liquid, which is applied in the field of 1-ethyl-4-alkylpiperazine ionic liquid, can solve the problems of poor stability, few types, short preparation cycle, etc., and achieve easy functionalization and short cycle , the effect of simple preparation method

Inactive Publication Date: 2015-04-29
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The one-step process is simple, the preparation period is short, and the disadvantage is that there are few types and poor stability

Method used

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  • 1-ethyl-4-alkylpiperazine ionic liquid and preparation method and application thereof
  • 1-ethyl-4-alkylpiperazine ionic liquid and preparation method and application thereof
  • 1-ethyl-4-alkylpiperazine ionic liquid and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: Preparation of iodide 1-ethyl-4-propylpiperazine ionic liquid

[0037] Dissolve 0.11 mol of iodopropane in 50 mL of dichloromethane, drop slowly into 0.1 mol of 1-ethylpiperazine, and react with stirring at 20°C for 20 hours. After the reaction was completed, 0.12 mol of sodium hydroxide was added to the reaction solution, and the reaction was continued at 20° C. for 24 hours. After the reaction, filter to remove solid impurities, evaporate dichloromethane, and wash the crude product twice with n-hexane, evaporate n-hexane, and dry under vacuum at 40°C to obtain 1-ethyl-4-propylpiperazine iodide ion Liquid, 98% purity, 90% yield.

[0038] The reaction formula is:

[0039]

Embodiment 2

[0040] Embodiment 2: Preparation of iodide 1-ethyl-4-butylpiperazine ionic liquid

[0041]Dissolve 0.1 mol of iodobutane in 50 mL of dichloromethane, drop slowly into 0.1 mol of 1-ethylpiperazine, and react with stirring at 5°C for 24 hours. After the reaction was completed, 0.14 mol of sodium hydroxide was added to the reaction liquid, and the reaction was continued at 25° C. for 24 hours. After the reaction, filter to remove solid impurities, evaporate dichloromethane, wash the crude product twice with n-hexane, evaporate n-hexane, and dry under vacuum at 40°C to obtain 1-ethyl-4-butylpiperazine iodide Liquid, 99% purity, 86% yield.

[0042] The reaction formula is:

[0043]

Embodiment 3

[0044] Embodiment 3: Preparation of iodide 1-ethyl-4-hexylpiperazine ionic liquid

[0045] Dissolve 0.09 mol of iodohexane in 50 mL of dichloromethane, drop slowly into 0.1 mol of 1-ethylpiperazine, and react with stirring at 40°C for 24 hours. After the reaction was completed, 0.12 mol of sodium hydroxide was added to the reaction liquid, and the reaction was continued at 40° C. for 24 hours. After the reaction, remove solid impurities by filtration, evaporate dichloromethane, wash the crude product twice with n-hexane, evaporate n-hexane, and dry under vacuum at 40°C to obtain 1-ethyl-4-hexylpiperazine iodide ionic liquid , 98% purity, 88% yield.

[0046] The reaction formula is:

[0047]

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PUM

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Abstract

The invention discloses 1-ethyl-4-alkylpiperazine ionic liquid which has the following chemical structural general formula: (img file='DDA0000450589630000011.TIF' wi='232' he='424' / ), wherein R is C3-C8 linear alkyl; Y- is I-, BF4-, PF6-, (CF3SO2)2N-, (C2F5SO2)2N-SCN- or N (CN)2-. The invention also discloses a method for preparing the 1-ethyl-4-alkylpiperazine ionic liquid. The method is simple in process and short in preparation cycle, the yield of the product can be over 80 percent, and the purity can be over 95 percent. Moreover, the invention also discloses application of the 1-ethyl-4-alkylpiperazine ionic liquid in deep desulfurization of oil and sulfur dioxide gas absorption.

Description

technical field [0001] The invention relates to the field of organic synthesis, in particular to a 1-ethyl-4-alkylpiperazine ionic liquid, a preparation method and an application thereof. Background technique [0002] Ionic liquids are also called room-temperature ionic liquids or low-temperature molten salts, and generally refer to organic salts with a melting point below 100°C. Since it is completely composed of ions, ionic liquids have many properties different from conventional organic solvents, such as low melting point, non-volatile, wide liquid range, good stability, strong solubility, adjustable properties, non-flammable, wide electrochemical window, etc. . [0003] At present, the cations of ionic liquids mainly include alkyl quaternary ammonium ions, alkyl quaternary phosphine ions, 1,3-dialkyl substituted imidazolium ions, and N-alkyl substituted pyridinium ions. [0004] The patent document with the publication number CN1696117B discloses a method for preparing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D241/12C10G21/20B01D53/14B01D53/50B01D53/78
CPCB01D53/1481B01D53/1493B01D2252/30C07D295/023C07D295/037C10G21/20
Inventor 陆晓星曹琦方文军郭永胜许莉胡申林
Owner ZHEJIANG UNIV
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