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Double-function catalyst for synthesizing cyclic carbonate and methyl carbonate

A bifunctional catalyst, the technology of dimethyl carbonate, is applied in the direction of organic compound/hydride/coordination complex catalyst, physical/chemical process catalyst, carbon dioxide or inorganic carbonate preparation, etc., which can solve the dosage of triphenylphosphine big problem

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

James et al. used triphenylphosphine as a catalyst to make propylene oxide, carbon dioxide and methanol react in one step at 130° C. for 3 hours, and 89% of propylene oxide was converted into propylene carbonate, and 8% of methanol was converted into dimethyl carbonate (WO 8403701), but the amount of triphenylphosphine is too large, up to 5% of the total mass of propylene oxide and methanol in the system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 1 mole of refined methanol, 0.25 mole of ethylene oxide, 0.5×10 -3 mol SalenAlCl(R 1 =R 2 =R 3 =R 4 =H) and 2.5×10 -3 Moles of tri-n-butylamine, stirred until Salen1AlCl was completely dissolved. Then move to a stainless steel autoclave with an effective volume of 200ml under the protection of carbon dioxide through a syringe.

[0029] While controlling the temperature at 120°C, carbon dioxide was added to the autoclave so as to maintain a constant pressure of 1.0 MPa. After reacting for 2 hours under stirring, the carbon dioxide flow was stopped, the autoclave was rapidly cooled to about 0° C., and the carbon dioxide in the autoclave was slowly released.

[0030] The liquid mixture product composition is analyzed by gas chromatography, and it is found that 10.1 grams of ethylene carbonate, 11.9 grams of dimethyl carbonate and 8.1 grams of ethylene glycol are contained, and the productive rate of dimethyl carbonate is 53%, and the conversion rate of ethylene o...

Embodiment 2

[0032] In the same equipment used in Example 1, under the same conditions, only the reaction time was extended from 2 hours to 3 hours.

[0033] The product composition of the liquid mixture is analyzed by gas chromatography, and it is found that 8.5 grams of ethylene carbonate, 13.5 grams of dimethyl carbonate and 9.1 grams of ethylene glycol are contained, the yield of dimethyl carbonate is 60%, and the conversion rate of ethylene oxide is higher than 98%.

Embodiment 3

[0035] In the same apparatus as used in Example 1, under the same conditions, only propylene oxide was used instead of ethylene oxide.

[0036] After reacting at 120° C. for 2 hours, 12.7 grams of propylene carbonate, 11 grams of dimethyl carbonate and 9.2 grams of 1,2 propylene glycol were obtained. The yield of dimethyl carbonate was 49%, and the conversion rate of propylene oxide was higher than 98%. .

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Abstract

The double-function catalyst for synthesizing cyclic carbonate and methyl carbonate includes main catalyst quadridentate Schiff base aluminum complex (R1)(R2)SalenAlX, where R1 and R2 is H, Cl-C6 alkyl, alkoxy Cl, Br, NO2 and other group; and X is C1, Br, I, OR NO3, CH3COO, ClO4 BF4 and other one valent negative ion, and cocatalyst being organic compound YR3, where Y is group V element and R3 is C2-C12 alkyl or aryl, with the molar ratio between the main catalyst quadridentate schiff base aluminum complex and the cocatalyst being 0.05-1. The catalyst can catalyze the reaction of epoxy compound with Co2 to synthesize cyclic carbonate and catalyze the exchange reaction of cyclic carbonate with methoxide to synthesize methyl carbonate in high efficiency.

Description

technical field [0001] The invention relates to a catalyst for cycloaddition reaction and transesterification reaction, in particular to a bifunctional catalyst for synthesizing cyclic carbonate and dimethyl carbonate by reacting alkylene oxide with carbon dioxide and methanol. 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, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22C07C68/04C07C69/08C07D317/34
CPCY02P20/141
Inventor 吕小兵何仁张英菊王辉
Owner DALIAN UNIV OF TECH
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