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Method for preparing propylene carbonate

A propylene carbonate, carbon dioxide technology, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, catalytic reactions, etc. Mild conditions, good selectivity and high yield

Inactive Publication Date: 2015-05-27
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many problems in the immobilized ionic liquid catalytic system represented by SBA-15 and silica gel, such as small pores, need for solvents, and poor catalyst stability.

Method used

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  • Method for preparing propylene carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0047] 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

[0051] 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

[0053] 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 method for preparing propylene carbonate by catalytic addition of propylene epoxide and carbon dioxide. The method comprises the following step: realizing carbonyl reaction of carbon dioxide and propylene epoxide under the action of an efficient end carboxyl polyether ionic liquid catalyst to prepare the propylene carbonate, wherein under the conditions that the reaction temperature is 60-100 DEG C, the reaction pressure is 1.0-1.5MPa, the stirring speed is 200-250r / min, the amount of the catalyst accounts for 1%-5% of mass of the propylene epoxide and the reaction time is 80-150 minutes, the conversion rate of the propylene epoxide is 98% and above, and can be up to 100%; the catalysis process is high in selectivity; byproducts such as polycarbonate or polyether are not generated; and when the catalyst is recycled for 13 times, the conversion rate and the selectivity indexes are both 95% and above.

Description

technical field [0001] The invention relates to a method for preparing propylene carbonate, in particular to a method for preparing propylene carbonate by catalytic addition of propylene oxide and carbon dioxide. 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 capacitor battery industry, the mixed solution of ethylene carbonate and propylene carbonate has a high dielectric constant and can be used as the electrolyte of lithium batteries. With the increasing popularity of mobile phones a...

Claims

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Application Information

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IPC IPC(8): C07D317/36B01J31/06
CPCY02P20/584C07D317/36B01J31/06B01J2231/34
Inventor 郭立颖张彬孙洪涛白世阳马秀云常雪婷陈标崔晨
Owner SHENYANG POLYTECHNIC UNIV
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