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High-activity catalyst for synthesizing cyclic carbonate in mild condition

A high-activity catalyst and cyclic carbonate technology, applied in organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, organic chemistry, etc., can solve the problem of low catalytic activity and maintain catalytic activity , highly selective effect

Inactive Publication Date: 2003-05-14
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although there are many types of catalysts reported, most of them have low catalytic activity, and often require the presence of high temperature, high pressure and high concentration catalysts to effectively catalyze the reaction of alkylene oxide and carbon dioxide to synthesize the corresponding cyclic carbonates.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In a stainless steel autoclave with an effective volume of 200ml, add 0.5×10 -3 mol SalenAlCl(R 1 = R 2 = R 3 = R 4 = H).

[0041] Weigh 0.5×10 -3 Put 1 molar potassium iodide and 18-crown-6 in a Schlink bottle, add 0.25 molar propylene oxide with a syringe, and stir until completely dissolved. The solution was then transferred to an autoclave under the protection of carbon dioxide.

[0042] The temperature was controlled at 25°C while carbon dioxide was added to the autoclave so as to maintain a constant pressure of 0.7 MPa. After reacting under magnetic stirring for 10 hours, stop passing carbon dioxide, and slowly let off unreacted carbon dioxide and alkylene oxide in the autoclave.

[0043] 25 grams of propylene carbonate are distilled out under reduced pressure, and the residue is subjected to FTIR and 1 H. 13 C-NMR analysis has no by-products such as polycarbonate, and the conversion rate of propylene oxide is 98%.

Embodiment 2

[0045] In the same apparatus as used in Example 1, under the same conditions, potassium bromide was used instead of potassium iodide. After reacting at 25° C. for 10 hours, 25.2 g of propylene carbonate was obtained, and the conversion rate of propylene oxide was 99%.

Embodiment 3

[0047] In the same apparatus as used in Example 1, under the same conditions, only ethylene oxide was used instead of propylene oxide. After 6 hours of reaction at 25° C., 20 g of ethylene carbonate was obtained, and the conversion of ethylene oxide was higher than 91%.

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Abstract

The high-activity catalyst for synthesizing cyclic carbonate in mild condition includes main catalyst quadridentate Schiff base metal complex (R1)(R2) SalenMX, where M is metal ion; R1 and R2 is H, Cl-C6 alkyl, alkoxy, C1, Br, NO2 and other group; and X is negative ion; and cocatalyst being inorganic salt and polyether complex M1Yn, where M1 is metal ion or MH4+; Y is Cl, Br, I, OR, NO3, CH3COO, ClO4, BF4 and other one valent negative ion; and n is 1 or 2 with the molar ratio between the cocatalyst and the main catalyst quadridentate Schiff base metal complex being 0.2-5. The two-component catalyst can catalyze the reaction of epoxy compound with CO2 to synthesize cyclic carbonate at mild condition without forming polycarbonate and other side product. The catalyst may be used repeatedly and maintain catalytic activity for long time.

Description

technical field [0001] The invention relates to a cycloaddition reaction catalyst, in particular to a high-activity catalyst for synthesizing cyclic carbonate by reacting alkylene oxide with carbon dioxide. Background technique [0002] Cyclic carbonates are high-boiling and highly polar organic solvents with excellent properties, and are widely used in organic synthesis, cosmetics, gas separation, battery dielectrics, and metal extraction. In recent years, many urea manufacturers have used propylene carbonate as a decarburizing agent, which has greatly increased the demand. In addition, cyclic carbonates are intermediates for the synthesis of green solvent-dimethyl carbonate by transesterification, and the market demand is large. The synthesis methods of cyclic carbonates mainly include phosgene method, transesterification method, and cycloaddition of epoxy compounds and carbon dioxide. Among them, the synthesis of cyclic carbonates by catalyzing the reaction of alkylene ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22C07D317/34
Inventor 吕小兵张英菊梁斌王辉
Owner DALIAN UNIV OF TECH
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