Preparation method of 1-aminopolypropylether-3-methylimidazolium chloride ion liquid catalyst

A technology of methylimidazolium ions and liquid catalysts, which is applied in the fields of physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, chemical instruments and methods, etc., and can solve the problem of insufficient catalyst efficiency and selectivity, cycle Short service life, harsh reaction conditions and other problems, to achieve the effect of easy control, increased cycle times, and improved catalytic activity

Active Publication Date: 2016-10-26
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a catalyst for preparing propylene carbonate by cycloaddition of carbon dioxide and propylene oxide, the purpose of which is to overcome the insufficient catalyst efficiency and selectivity, large side reactions, short cycle life and harsh reaction conditions in the prior art and other shortcomings

Method used

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  • Preparation method of 1-aminopolypropylether-3-methylimidazolium chloride ion liquid catalyst
  • Preparation method of 1-aminopolypropylether-3-methylimidazolium chloride ion liquid catalyst
  • Preparation method of 1-aminopolypropylether-3-methylimidazolium chloride ion liquid catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] First weigh 10mL of hydroxyl-terminated polyepichlorohydrin, then measure 20mL of toluene to dissolve it, then pour the solution into a three-necked flask equipped with reflux condensation, add a magnet and stir at a speed of 150-200r / min; bromine and hydroxyl-terminated polyepichlorohydrin molar ratio of 3:1, bromine is poured into a separatory funnel, and slowly added dropwise at room temperature; after the dropwise addition, react at room temperature for 2 hours; 40°C, react for 1 hour; then raise the temperature to 50°C, react for 1 hour; then raise the temperature to 60°C, react for 1 hour, and obtain the initial product of the terminal brominated polyether solution.

[0057] According to the amount of ammonia water and polyepichlorohydrin molar ratio of 5:1, it was added to the separatory funnel, slowly added dropwise at room temperature, and continued to react after the dropwise addition until the color of the solution changed from reddish brown to colorless and s...

Embodiment 2

[0062] In the same equipment used in Example 1, under the same process conditions, just change N-methylimidazole into N-ethylimidazole, after the reaction, the purity of the propylene carbonate product is 98.3%, and the calculated epoxy The conversion rate of propane is 100%, the selectivity is 95.2%, and the conversion frequency is 3125h -1 .

Embodiment 3

[0064] In the same equipment used in Example 1, under the same process conditions, just change N-methylimidazole into N-methylpiperazine, after the completion of the reaction, the purity of the propylene carbonate product is 96.3%. The conversion rate of oxypropane is 98.5%, the selectivity is 94.1%, and the conversion frequency is 2866h -1 .

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Abstract

The invention relates to a 1-aminopolypropylether-3-methylimidazolium chloride ion liquid catalyst and a preparation method thereof. The prepared catalyst makes an ion liquid structure contain an active amino-terminated functional group and a polyether large-molecular chain at the same time in a chemical bonding mode, the coordinative catalysis effect, base position isolation effect and infinite dilution effect of the catalyst are well achieved, the generation of byproducts is effectively reduced, and the catalyst has the excellent advantages of being high in activity and selectivity, stable in active component, small in consumption, easy to separate and recover, recyclable, long in service life, friendly to the environment and the like; no side effects happen in the catalysis process, and a new propylene carbonate product high in purity, yield, selectivity and transformation frequency can be obtained at low temperature and pressure.

Description

technical field [0001] The invention relates to a method for preparing a chlorinated 1-aminopolypropyl ether-3-methylimidazole ionic liquid catalyst, in particular to a method for preparing a catalyst for preparing propylene carbonate by catalyzing the cycloaddition reaction of carbon dioxide and propylene oxide. Background technique [0002] Cyclic carbonates are high-boiling green solvents with excellent properties and important organic synthesis intermediates. Compared with non-cyclic carbonates, they show better thermodynamic stability. They are used in many fields such as printing and dyeing, textiles, batteries, and polymer synthesis. There are a wide range of applications. With the popularity of mobile phones and computers, the market demand for cyclic carbonates continues to increase, and the products have high added value and development potential. In recent years, both at home and abroad have also developed the technology of co-producing ethylene / propylene glycol ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/06C07D317/36C08G65/323C08G65/325C08G65/333
CPCB01J31/068B01J2231/341C07D317/36C08G65/3233C08G65/3255C08G65/33317
Inventor 郭立颖邓莉莉马秀云李继新王立岩李凤红李姝
Owner SHENYANG POLYTECHNIC UNIV
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