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Preparation method of cyclic carbonate by chromium-based catalyst

A cyclic carbonate, chromium-based catalyst technology, used in chemical instruments and methods, physical/chemical process catalysts, catalytic reactions, etc., can solve problems such as low efficiency, save energy, shorten reaction time, and reduce pressure equipment. desired effect

Inactive Publication Date: 2018-03-23
HENAN INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a heterogeneous catalyst with simple synthesis steps, cheap and easy-to-obtain raw materials, high catalytic efficiency, stability and easy recovery in view of the low efficiency of the current reaction system under mild conditions. Under normal pressure and solvent-free conditions, it can be converted into cyclic carbonate with high efficiency catalytic conversion, which can be widely used in industrial production fields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The chromium-based catalyst of the present embodiment prepares the method for cyclic carbonate, the steps are as follows:

[0021] Into a 10mL stainless steel autoclave, add 50mg (active component chromium 0.4mol%) catalyst conjugated chromium porphyrin bipyridine microporous polymer material, 12.5mmol propylene oxide and 0.9mmol co-catalyst tetra-n-butyl in turn. Ammonium bromide, feed carbon dioxide and keep the pressure at 0.1MPa, stir for 48 hours at a temperature of 25°C, cool at room temperature, slowly release the remaining carbon dioxide, filter and separate the catalyst, and purify to obtain the separation of the cyclic carbonate Yield was 85%.

Embodiment 2

[0023] The chromium-based catalyst of the present embodiment prepares the method for cyclic carbonate, the steps are as follows:

[0024] Into a 10mL stainless steel autoclave, add 50mg (active component chromium 0.3mol%) catalyst conjugated chromium porphyrin bipyridine microporous polymer material, 12.5mmol butylene oxide and 0.9mmol co-catalyst tetra-n-butyl in turn. ammonium bromide, introduced carbon dioxide and kept the pressure at 0.1 MPa, stirred for 48 hours at a temperature of 25 °C, cooled at room temperature, slowly released the remaining carbon dioxide, separated the catalyst by filtration, and purified to obtain cyclic carbonate. The isolated yield was 83%.

Embodiment 3

[0026] The chromium-based catalyst of the present embodiment prepares the method for cyclic carbonate, the steps are as follows:

[0027] Into a 10mL stainless steel autoclave, add 50mg (active component chromium 0.5mol%) catalyst conjugated chromium porphyrin bipyridine microporous polymer material, 12.5mmol epichlorohydrin and 0.9mmol co-catalyst tetra-n-butyl in turn. ammonium bromide, introduced carbon dioxide and kept the pressure at 0.1 MPa, stirred for 48 hours at a temperature of 25 °C, cooled at room temperature, slowly released the remaining carbon dioxide, separated the catalyst by filtration, and purified to obtain cyclic carbonate. The isolated yield was 86%.

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Abstract

The invention discloses a preparation method of cyclic carbonate by chromium-based catalyst. The chromium-based catalyst compounded by high-efficient green catalysis is realized under the condition ofconstant temperature high pressure solvent-free by using carbon dioxide and epoxide as raw materials, conjugated chrome porphyrin dipyridyl / conjugated chrome porphyrin pyrrole microporous polymer material as a poly-phase catalyst, and tetra-n-butylammonium bromide as co-catalyst. The method has the main advantages that the catalyst is simple in preparation method, low in cost, high in catalytic activity, stable in structure performance, easy to recycle and repeatable; the reaction condition is gentle, speed is quick and the operation is safe. The preparation method is applicable to the large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of organic synthesis, in particular to a method for preparing a cyclic carbonate with a chromium-based catalyst. Background technique [0002] With the development of society and the progress of human civilization, especially the rapid development of industry, the demand for fossil energy consumption is increasing day by day. With the extensive use of fossil fuels, the concentration of carbon dioxide increases rapidly and becomes a major greenhouse gas, causing a series of environmental and ecological problems. At the same time, carbon dioxide is an ideal carbon-resource that is widely distributed, abundant in reserves, cheap and easy to obtain, renewable, non-toxic and non-flammable. Whether from the perspective of environmental protection or the utilization of renewable resources, research on carbon dioxide capture and chemical conversion is of great significance. The synthesis of organic carbonate from ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D317/36C07D317/64B01J31/22
CPCB01J31/1691B01J2231/32B01J2531/0213B01J2531/0238B01J2531/62C07D317/36C07D317/64
Inventor 曹毅张晓峰李思雨王延伟许志忠
Owner HENAN INST OF ENG
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