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Carboxyl-terminated polyether ionic liquid catalyst and preparation method thereof

An ionic liquid and carboxyl-terminated technology, which is applied in the field of carboxyl-terminated polyether ionic liquid catalyst and its preparation, can solve the problems of insufficient catalyst efficiency and selectivity, short cycle life, harsh reaction conditions, etc., and achieve synergistic catalytic effect , long cycle life, reduce the effect of by-product formation

Inactive Publication Date: 2015-06-17
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The invention provides a carboxyl-terminated polyether ionic liquid catalyst and a preparation method thereof, which improves the chemical structure of the ionic liquid catalyst, makes the ionic liquid structure contain polyether macromolecular chains and carboxyl-terminated active groups, and improves the activity of the catalyst and selectivity, prolonging the cycle life of the catalyst; its purpose is to overcome the shortcomings of the prior art, such as insufficient catalyst efficiency and selectivity, large side reactions, short cycle life, and harsh reaction conditions.

Method used

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  • Carboxyl-terminated polyether ionic liquid catalyst and preparation method thereof
  • Carboxyl-terminated polyether ionic liquid catalyst and preparation method thereof
  • Carboxyl-terminated polyether ionic liquid catalyst and preparation method thereof

Examples

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Effect test

Embodiment 1

[0059] First, add hydroxyl-terminated polyepichlorohydrin to chloroacetic acid in a molar ratio of 1:2.2 into a three-necked flask equipped with a condenser, acetonitrile as a solvent, and start stirring at a temperature of 80°C. After reacting for 1 hour, a small amount of Na 2 CO 3 Add the powder into the three-necked flask until it is completely dissolved, then repeat the addition until the system can no longer be dissolved. After reacting for about 7-8 hours, hydrochloric acid was added dropwise to the obtained liquid to adjust the pH value to be acidic. During the dropping process, the system was layered, the upper layer was a liquid phase, and the lower layer was a granular white solid. The upper liquid phase was rotary evaporated at a temperature of 70° C. and 0.09 MPa to remove the acetonitrile solvent. Then the product was washed 5 times with deionized water to remove some small molecules and excess chloroacetic acid, and then rotated at 70°C and 0.09Mpa to remove a ...

Embodiment 2

[0063]In the same equipment used in Example 1, under the same conditions, just change the catalyst consumption to 5.40g (accounting for 5% of the propylene oxide quality), its catalyzed reaction nearly 90min observes that the carbon dioxide mass flow count value does not change, After the reaction was completed, the purity of the propylene carbonate product was measured to be 99.6%, the calculated conversion rate of propylene oxide was 100.0%, and the selectivity was 99.2%.

Embodiment 3

[0065] In the same equipment used in Example 1, under the same conditions, just change the catalyst consumption to 1.08g (accounting for 1% of the propylene oxide mass), react 2.5h and observe that the carbon dioxide mass flow count value does not change, and the reaction is completed The purity of the propylene carbonate product was measured to be 99.1%, the conversion rate of ethylene oxide was calculated to be 99.8%, and the selectivity of ethylene carbonate was 98.2%.

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Abstract

The invention relates to a carboxyl-terminated polyether ionic liquid catalyst and a preparation method thereof. According to the prepared catalyst, an ionic liquid structure simultaneously contains active carboxyl-terminated functional groups and macromolecular polyether chains in a chemical bonding manner, so that the synergetic catalytic effects, site isolation effects and infinite dilution effects of the catalyst are well achieved, the generation of byproducts is effectively reduced, and the catalyst has excellent characteristics of high activity, high selectivity, stable active ingredients, small using amount, easiness in separation and recovery, reusability, long service life, environment friendliness and the like; the catalyst is used for a process of adding carbon dioxide and propylene oxide to prepare propylene carbonate, and a novel propylene carbonate product with high yield and high purity can be obtained under lower temperature and pressure.

Description

technical field [0001] The invention relates to a carboxyl-terminated polyether ionic liquid catalyst and a preparation method thereof, in particular to a carboxyl-terminated intermediate through the conversion of the active terminal hydroxyl group of polyepichlorohydrin, and then reacting with a tertiary amino compound to form a Polyether ionic liquid catalyst with carboxyl-terminated functional group and its preparation method. Background technique [0002] Cyclic carbonate is a good solvent for the production of high polymers such as polyamide, polyacrylonitrile, polyvinyl chloride, etc. It can also be used as spinning liquid and other chemical auxiliary agents in textiles, and can also be used as a solvent for removing industrial acid gases and concrete additives. In medicine, it can be used as a pharmaceutical component and an organic synthesis intermediate, and can also be used as a plastic foaming agent and a stabilizer for synthetic lubricating oil. In the capacito...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/06C08G65/26C07D317/36
Inventor 郭立颖马秀云孙洪涛白世阳张彬常雪婷刘亚茹王赫
Owner SHENYANG POLYTECHNIC UNIV
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