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A kind of method that load type quaternary phosphonium salt catalyst prepares cyclic carbonate

A cyclic carbonate and catalyst technology, applied in the field of cycloaddition reaction to prepare cyclic carbonate, can solve the problems of low catalytic efficiency, complex preparation process, harsh reaction conditions and the like, and achieve long service life, high catalytic activity, good stability

Active Publication Date: 2017-12-26
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, supported catalysts still generally have problems such as low catalytic efficiency, harsh reaction conditions, poor selectivity, complicated preparation process, short service life, and the need to add co-catalysts. , a catalyst with good selectivity is still very important

Method used

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  • A kind of method that load type quaternary phosphonium salt catalyst prepares cyclic carbonate
  • A kind of method that load type quaternary phosphonium salt catalyst prepares cyclic carbonate
  • A kind of method that load type quaternary phosphonium salt catalyst prepares cyclic carbonate

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Experimental program
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Effect test

Embodiment 1

[0019]

[0020] Implementation method: In a 100ml stainless steel autoclave, 0.24g of tris(2,4,6-trimethoxyphenyl)phosphine (X=Br in the structural formula) supported by chloromethylated styrene resin is added successively (in the form of tris(2 , 4,6-trimethoxyphenyl) phosphine content is calculated as 0.2mmol), 2ml propylene oxide (1a) (41.5mmol), airtight reaction vessel, fills the carbon dioxide of 1.5MPa pressure, controls the temperature slowly by the temperature controller Rising to 120°C, the reaction time is 2.5h. After the reaction, the reactor was cooled to -15°C, and excess carbon dioxide was slowly released. After the catalyst was separated by filtration, the resulting product (2a) was analyzed by gas chromatography. The selectivity was 99.8%, and the yield was 99.7%.

Embodiment 2

[0022] Same as Example 1, the catalyst used is tris(2,4,6-trimethoxyphenyl)phosphine supported by chloromethylated styrene resin (X=Cl in the structural formula), the reaction time is 4h, and other conditions remain unchanged. The product (2a) obtained has a selectivity of 99.8% and a yield of 99.6%.

Embodiment 3

[0024] Same as Example 1, the catalyst used is tris(2,4,6-trimethoxyphenyl)phosphine supported by chloromethylated styrene resin (X=I in the structural formula), the reaction time is 1.5h, and other conditions remain unchanged , to obtain the product (2a) with a selectivity of 99.8% and a yield of 99.3%.

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Abstract

The invention relates to a method for preparing cyclic carbonate by using a supported quaternary phosphonium salt catalyst, which comprises the following step: by using a supported quaternary phosphonium salt as the catalyst which accounts for 0.2-5 mol% of the epoxide on the basis of the tri(2,4,6-trimethoxyphenyl)phosphine content, catalyzing cycloaddition of the epoxide and carbon dioxide to synthesize the corresponding cyclic carbonate, wherein the reaction pressure 0.3-10 MPa, the reaction temperature is 80-180 DEG C, and the reaction time is 0.5-24 hours. The method has the advantages of mild preparation conditions, high catalyst activity, long service life and the like, and can easily separate the product and recover the catalyst.

Description

technical field [0001] The invention relates to a method for preparing cyclic carbonate, in particular to a method for preparing cyclic carbonate by cycloaddition reaction from carbon dioxide and epoxide under the condition of a loaded quaternary phosphonium salt catalyst. Background technique [0002] Carbon dioxide is currently the most important greenhouse gas on the earth, and it is also the cheapest and most abundant resource in the C1 family. On a global scale, its carbon content is 10 times that of oil, coal, and natural gas. For the sake of environmental protection and energy Dual demand, the conversion and utilization of carbon dioxide has become the focus of attention of all countries. Cyclic carbonates are an important class of organic synthesis intermediates with good solubility and biodegradability, and are excellent cleaning reagents. It can be used as an additive in the production of cosmetics, and is also used in the electrolyte of high-density battery capac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D317/38C07D317/36C07D317/46B01J31/02B01J31/06
CPCB01J31/0271B01J31/06B01J2231/324C07D317/36C07D317/38C07D317/46
Inventor 焉晓明邓庆元贺高红潘昱郑文姬阮雪华
Owner DALIAN UNIV OF TECH