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Microwave chemical method for preparing ethylene by catalytic dehydration of ethanol

A technology of microwave chemistry and catalytic dehydration, which is applied in the direction of organic chemistry and hydrocarbon production from oxygen-containing organic compounds, etc., can solve the problem of high energy consumption and achieve the effects of low energy consumption, accelerated reaction rate, and shortened reaction time

Inactive Publication Date: 2006-12-27
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using these two catalysts to dehydrate ethanol, the reaction temperature is generally 360-420°C, so the energy consumption is relatively high.

Method used

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  • Microwave chemical method for preparing ethylene by catalytic dehydration of ethanol
  • Microwave chemical method for preparing ethylene by catalytic dehydration of ethanol
  • Microwave chemical method for preparing ethylene by catalytic dehydration of ethanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 400 milliliters of 85% phosphoric acid into a 1000 milliliter glass reaction bottle equipped with a temperature measuring probe, an ethanol inlet tube and an ethylene outlet pipe and put it into a microwave reactor. The microwave frequency is 300 MHz to start the microwave reactor and within 5 minutes the Heat to a simmer. After it is cooled to room temperature, introduce 50 milliliters (0.859 moles) of absolute ethanol (d 20 =0.79), when the temperature reaches 120°C for 1 minute by microwave irradiation with 10 watts / ml phosphoric acid strength, gas will be released. The gas is flammable, insoluble in water and rapidly discolors purple acidic potassium permanganate solutions, indicating that it is ethylene gas. After irradiating for 3 minutes, the temperature rose to 200°C, and a large amount of ethylene gas was released. The purity of ethylene gas was identified by gas chromatography to reach 99.5%. The vigorous dehydration reaction proceeded for about 4 minut...

Embodiment 2

[0029] microwave power

[0030] The generated polyphosphoric acid was still and naturally cooled to 36°C, and 100 ml of 95% ethanol was added and mixed evenly. The mixture is heated to 120° C. under microwave irradiation with a frequency of 2450 MHz and an intensity of 15 watts / ml of phosphoric acid (according to the amount of feed) to release ethylene gas. figure 1 The heating curve for the first 10 minutes is shown. The gas release took 9 minutes from the beginning to the end, and the average release rate was 7 ml / s.

Embodiment 3

[0032] Add 400 milliliters of triethyl phosphate [mass content 96%, specific gravity (D 20 =1.07)] and 200 milliliters of 80% industrial ethanol are placed in a microwave reactor, and microwave irradiation with a frequency of 300 GHz and 20 watts / ml triethyl phosphate intensity is used, and ethylene gas is released after 4 minutes. The release rate was 2 ml / sec.

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Abstract

The invention discloses a microwave chemical method of ethane, which is characterized by the following: dehydrating alcohol into ethane irradiated by microwave at 120-300 deg.c and 300MHz-300GHz frequency; adopting catalyst with molecular formulation at Hn+2PnO3n+1 (n is positive integral phosphoric acid, pyrophosphoric acid, polyphosphoric acids or their carbethoxy).

Description

technical field [0001] The invention relates to a method for preparing ethylene by catalytic dehydration of ethanol, which belongs to the field of organic synthesis. Background technique [0002] Ethylene is the basic raw material of many important chemical products (such as ethylene oxide, ethylene glycol, acetic acid, polyethylene, polyvinyl chloride, etc.), and is currently mainly produced from petroleum. As petroleum resources are non-renewable and are gradually becoming exhausted, the use of renewable biomass resources to develop bioenergy and biochemical industries has become an inevitable trend of current and future economic development. Ethanol can be obtained by fermentation of both vegetable starch and lignocellulose as raw materials. The source of raw materials is extensive and sufficient, which can meet the needs of large-scale biomass chemical industry development. Therefore, the dehydration of ethanol to produce ethylene has great potential to partially or com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/24C07C11/04
Inventor 刘立建杜娇娇
Owner WUHAN UNIV
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