Method for synthesizing cyclic carbonate

A technology for cyclic carbonates and compounds, which is applied in the field of synthesizing cyclic carbonates, can solve the problems of insufficient catalytic activity, unstable catalyst air, and difficult separation of catalysts, and achieve wide application range, easy recovery and recycling, high The effect of catalytic activity and selectivity

Inactive Publication Date: 2005-11-16
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there are many catalytic systems reported and good conversion and selectivity have been obtained, there is still at least one of the following disadvantages: (1) the catalytic activity is not high enough to meet the requirements of practical industrial applications, (2) the catalyst is unstable or Air sensitive, (3) requires co-solvent, (4) requires high temperature and pressure, (5) catalyst is difficult to separate

Method used

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  • Method for synthesizing cyclic carbonate
  • Method for synthesizing cyclic carbonate
  • Method for synthesizing cyclic carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In a 100 ml autoclave, add zinc bromide 0.00002mol, 0.00012mol of guanidinium salt successively, the guanidine salt is: hexabutylguanidine bromide (a), hexapropylguanidine bromide (b), tetraethyl dibutyl guanidine bromide (c), tetramethyldibutylguanidine bromide (d), hexaisopropylguanidine bromide (e), tetraethyldihexylguanidine bromide (f), hexahexylguanidine bromide ( g), hexapentylguanidine bromide (h), hexaethylguanidine bromide (i), hexabutylguanidine chloride (j), hexabutylguanidine iodide (k), N, N'-dimethyl N, N'-ethylene, one of N"-dibutylguanidine salts (l), propylene oxide 0.172mol, the temperature is controlled by a temperature controller to slowly rise to a reaction temperature of 130°C, and a carbon dioxide pressure of 3MPa After one hour of reaction time, it was cooled to room temperature, and excessive carbon dioxide was slowly emitted, and the liquid obtained by the reaction was distilled under reduced pressure to obtain propylene carbonate, and the sel...

Embodiment 2

[0026] In a 100 milliliter autoclave, add zinc bromide 0.00002mol successively, 0.00012mol hexabutylguanidine bromide, propylene oxide 0.215mol, control at different reaction temperatures and carbon dioxide pressure (see Table 2), after reaction time one hour , cooled to room temperature, slowly emitting excess carbon dioxide, the liquid obtained by the reaction was distilled out of propylene oxide by normal pressure, and then distilled under reduced pressure to obtain propylene carbonate, the selectivity was 99%, the results are shown in Table 2.

[0027] Numbering

Embodiment 3

[0029] In a 100 ml autoclave, 0.00002 mol of zinc bromide, different proportions of hexabutylguanidine bromide, and 0.172 mol of propylene oxide were successively added, and the temperature was controlled by a temperature controller to slowly rise to a reaction temperature of 100°C and a carbon dioxide pressure of 4 MPa. After the set time (see Table 3), cool to room temperature, slowly emit excess carbon dioxide, and distill the liquid obtained from the reaction to distill propylene oxide under normal pressure, then distill under reduced pressure to obtain propylene carbonate, the selectivity is 99% %, and the results are shown in Table 3.

[0030] Numbering

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Abstract

A process for synthesizing the cyclic carbonate features the catalytic cyclizing addition reaction between Co2, epoxy compound and the catalyst prepared from lewis acid-metal compound and hexalkyl guanidine salt at 100-150 deg.C for 0.5-5 hrs.

Description

technical field [0001] The invention belongs to the technical field of synthesizing cyclic carbonates. Background technique [0002] The synthesis methods of cyclic carbonates mainly include phosgene method, transesterification method and cycloaddition of epoxy compounds and carbon dioxide, etc., wherein epoxy compounds and carbon dioxide are used as raw materials to generate cyclic carbonates by cycloaddition in the presence of catalysts. A low-pollution, environment-friendly synthetic route, its research and development has been widely concerned by everyone in recent years, and its reasons can be summarized as follows: (1) carbon dioxide is considered to be one of the gases that warm the earth, so using The method consumes the carbon dioxide released by industry, and reducing the concentration of atmospheric carbon dioxide will be a way to delay global warming. (2) The reaction of carbon dioxide and epoxy compounds to form a cyclic carbonate is a typical atom-economical r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D317/34
Inventor 张所波谢海波
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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