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A kind of method for improving the activity of propylene oxide catalyst and co-producing ketal (aldehyde)

A technology of propylene oxide and catalyst, which is applied in the field of improving the activity of propylene oxide catalyst and co-producing ketal, which can solve the problems such as complex preparation process, and achieve the effects of good economy, mechanical activity and stability

Active Publication Date: 2020-11-20
JIANGSU YANGNONG CHEM GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned catalysts are all supported heteropolyacid catalysts, and the preparation process is relatively complicated.

Method used

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  • A kind of method for improving the activity of propylene oxide catalyst and co-producing ketal (aldehyde)
  • A kind of method for improving the activity of propylene oxide catalyst and co-producing ketal (aldehyde)
  • A kind of method for improving the activity of propylene oxide catalyst and co-producing ketal (aldehyde)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Epoxidation reaction: Put 500g propionitrile and 12.5g phosphotungstic acid catalyst into a 1L autoclave, fill it with 61.8g propylene (1.47mol), add 25g 50% hydrogen peroxide (0.37mol), stir vigorously at 70°C for 4h, cool down , Pressure relief, sampling and analysis. The hydrogen peroxide conversion rate is 99.65%, the PO yield is 91.83%, and the PG yield is 4.33%. Ketal (aldehyde) synthesis reaction: steam the PO from the above-mentioned kettle material, transfer the remainder of the kettle to a four-necked flask equipped with stirring, thermometer, water separator, and reflux condenser, and add 3.15g of cyclohexanone (cyclohexanone and PG The molar ratio is 2), control the reaction temperature to reflux and divide the water until no water is released, the reaction is completed for 2 hours, the temperature is lowered, the sample is analyzed, the catalyst is recovered by filtration, the filtrate is distilled to separate the solvent propionitrile, the raw material cyc...

Embodiment 2-5

[0022] Epoxidation reaction: reaction conditions are the same as embodiment 1, change reaction temperature, time. The results obtained are as follows:

[0023]

Embodiment 6-10

[0025] Epoxidation reaction: reaction condition is the same as embodiment 1, changes the kind and consumption of heteropolyacid catalyst, and gained result is as follows:

[0026]

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Abstract

The invention provides a method for synthesizing propylene epoxide and co-producing ketal (acetal) by taking a by-product PG as a raw material in propylene epoxidation in the presence of heteropoly acid as a catalyst. Negative effects of alcohol substances to the activity of the catalyst in epoxidation reaction are eliminated, the activity of the catalyst is improved, the catalyst is used stably,meanwhile, downstream application of the by-product PG is expanded, and a preparation method for ketal (acetal) is provided. The method has the advantages of gentle reaction conditions, good catalyzing stability, good catalyst using effect, and resource utilization of the by-product.

Description

technical field [0001] The invention belongs to the field of organic chemical industry, and relates to a method for improving the catalyst activity of propylene oxide (PO) and co-producing ketal (aldehyde). More specifically, it relates to a method of using heteropoly acid as a catalyst, hydrogen peroxide as an oxidant to catalyze propylene epoxidation to generate PO, and using the by-product propylene glycol of PO hydrolysis in the epoxidation reaction to synthesize a ketal (aldehyde), and the PO yield is ≥ 90% (calculated for hydrogen peroxide), propylene glycol conversion rate ≥ 98%, ketal (aldehyde) yield ≥ 90% (calculated for propylene glycol), co-production of high value-added ketal (aldehyde) with by-product propylene glycol as raw material, The resource utilization of by-products is effectively realized, and the negative influence of alcohol substances on the catalyst activity in the propylene epoxidation reaction is solved, and the stable application of the catalyst i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D301/12C07D303/04C07D317/72C07D317/12
CPCC07D301/12C07D303/04C07D317/12C07D317/72Y02P20/52
Inventor 王根林丁克鸿徐林王铖王刚殷恒志戚明甫许越刘相李吴健刘洁郭玉秀刘鑫
Owner JIANGSU YANGNONG CHEM GROUP