Catalyst of synthetic propylene and application thereof

A technology of propylene carbonate and catalyst, applied in the field of catalyst for synthesizing propylene carbonate and its preparation, can solve the problems of high price, high toxicity and toxicity of crown ether, and achieves a catalyst with low cost, no environmental pollution, and not easy to be lost. Effect

Inactive Publication Date: 2003-06-18
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalysts commonly used for the cycloaddition reaction of carbon dioxide and propylene oxide are halogen compounds, n-Bu 3 Sn+nBu 4 PI organic transition metal halides and metal ether supported potassium iodide catalysts (Molecular Catalysis, 1998, 6, 409) have obtained high activity, but the preparation of the catalyst is relatively complicated
Kazuyoshi Takahashi of Japan (JP71-128778) proposed a complex catalyst of an alkal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] According to the composition (percentage by weight) of 20% potassium carbonate and 80% zirconia, the zirconia carrier is impregnated in the potassium carbonate solution, allowed to stand for 24 hours, dried at 120°C, and calcined at 600°C for 4 hours to obtain the catalyst. The cycloaddition reaction is carried out in an autoclave. Earlier in autoclave, add catalyzer, propylene oxide and methyl iodide, its add-on is potassium carbonate: propylene oxide: methyl iodide=0.01: 1: 0.025 (molar ratio), feeds the carbonic acid gas of 3.0MPa then, while stirring Under conditions, the temperature was raised to 150°C, and the reaction was carried out for 1 hour. After cooling, the residual gas was released and filtered to separate the catalyst from the reaction product. The reaction product was analyzed by gas chromatography. The conversion rate of propylene oxide was 99.4%, and the yield of propylene carbonate was 99.4%. was 98.1%.

Embodiment 2

[0023] 10% by potassium carbonate, alumina is 90% of the composition (percentage by weight) impregnated the alumina support in the potassium carbonate solution, let it stand for 24 hours, dried at 120°C, and roasted at 600°C for 4 hours to obtain the catalyst, and the remaining conditions With embodiment 1. The reaction conditions are as follows: pressure=3.0MPa, temperature=140 DEG C, potassium carbonate: propylene oxide: methyl iodide mol ratio=0.003: 1: 0.02, the reaction times is 1 hour, and reaction product is analyzed by gas chromatography, the conversion of propylene oxide The yield was 83.6%, and the yield of propylene carbonate was 80.1%.

Embodiment 3

[0025] Be 10% by potassium hydroxide, magnesia is 90% composition (percentage by weight) the magnesia carrier is impregnated in the potassium hydroxide solution, let stand for 24 hours, through 120 ℃ of drying, 600 ℃ of roasting 4 hours make catalyst, All the other conditions are with embodiment 1. Reaction condition is as follows: pressure=2.0MPa, temperature=120 ℃, potassium hydroxide: propylene oxide: methyl iodide mol ratio=0.003: 1: 0.02, the reaction times is 0.5 hour, and reaction product is through gas chromatography analysis, and the propylene oxide The conversion rate was 76.4%, and the yield of propylene carbonate was 72.3%.

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PUM

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Abstract

A catalyst for synthesizing the propylene carbonate is composed of potassium salt (10-20 wt%), and activated carbon, metal oxide, or molecular sieve (80-90 wt%). The propylene carbonate is prepared through reaction between potassium salt, epoxy propane and iodomethane at 120-180 deg.C and 2-6 MPa for 0.5-2 hr. Its advantages are high catalytic activity, low cost and cyclic use.

Description

[0001] Field: [0002] The invention belongs to a catalyst for synthesizing propylene carbonate and a preparation method thereof, in particular to a catalyst for synthesizing propylene carbonate with carbon dioxide and propylene oxide and an application thereof. Background technique: [0003] The formation of propylene carbonate from carbon dioxide and propylene oxide under the action of a catalyst is one of the effective methods for fixing carbon dioxide, and the product has many uses. The company is used as a plasticizer, spinning solvent, dispersant for water-soluble dyes, extractant for olefins and aromatics, and a decarburizer in nitrogen fertilizer production. Using propylene carbonate as the electrolyte in lithium-ion batteries can make graphite anodes obtain protection, and can be used as a raw material for environmentally friendly chemicals dimethyl carbonate and polycarbonate. The catalysts commonly used for the cycloaddition reaction of carbon dioxide and propylene...

Claims

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Application Information

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IPC IPC(8): B01J23/02B01J27/232B01J27/25B01J29/06B01J31/04C07C68/00C07C69/96
Inventor 杨彩虹韩怡卓柳玉琴李文彬谭猗生
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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