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A kind of method for producing ethylene by dehydration of ethanol

A technology for ethanol dehydration and ethylene, applied in ethylene production, chemical instruments and methods, catalyst activation/preparation, etc., can solve problems such as high reaction temperature, low space velocity, and high energy consumption, and achieve reduced carbon deposition rate and ethylene selection The effect of improving the performance and reducing the energy consumption of the reaction

Active Publication Date: 2021-11-02
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] According to one aspect of the present application, a method for producing ethylene by dehydration of ethanol is provided, which overcomes the above-mentioned problems of high reaction temperature, small space velocity, and large energy consumption in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] The H-type mordenite molecular sieve (Si / Al ratio of Si / Al is 15) from which the adsorbed water has been removed is placed in a 0.01M NaOH dilute solution and stirred at room temperature for 1 hour. The acidic proton selectivity of the 8-membered ring channel of the molecular sieve is determined Sodium ion substitution. Afterwards, the catalyst was heated at a high temperature of 800°C under a water vapor atmosphere with a volume ratio of 30 (N 2 For the balance gas) Static treatment for 6 hours to remove the skeleton aluminum in the 12-membered ring channel of the molecular sieve. Afterwards, the catalyst was placed in 1M NH 4 NO 3 The solution was stirred at room temperature for 10 hours, washed and dried, and then calcined for 5 hours at 500° C. in air to obtain H-type mordenite molecular sieves that selectively remove aluminum from the 12-membered ring channel framework.

[0076] The performance evaluation of the catalyst was carried out on an atmospheric fixed-b...

Embodiment 2

[0078] In Example 1, the catalyst treatment conditions were not changed, the catalyst performance evaluation reaction temperature was 300° C., and other reaction conditions were not changed. The reaction products were analyzed by online GC-MS, and the reaction results are shown in Table 1.

Embodiment 3

[0080] In Example 1, the catalyst treatment conditions were not changed, the catalyst performance evaluation reaction temperature was 350° C., and other reaction conditions were not changed. The reaction products were analyzed by online GC-MS, and the reaction results are shown in Table 1.

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Abstract

The application discloses a method for producing ethylene by ethanol dehydration, which is characterized in that the raw material containing ethanol is passed through a reactor equipped with a catalyst, and reacted with the catalyst to generate a product containing ethylene; the reaction conditions: the reaction temperature is 200~400℃, reaction pressure 0~2MPa, mass space velocity of ethanol 0.1~15h ‑1 ; The catalyst is dealuminated mordenite molecular sieve. The catalyst used in the method is a mordenite molecular sieve which selectively removes aluminum from a 12-membered ring channel framework. The modified mordenite molecular sieve is used to catalyze the reaction of ethanol dehydration to ethylene, which has excellent reactivity under relatively low temperature conditions. The reaction temperature is 220 °C and the space velocity is as high as 6h ‑1 Under certain reaction conditions, the conversion rate of ethanol is 100%, and the selectivity of ethylene is as high as 99%.

Description

technical field [0001] The application relates to a method for ethanol dehydration to ethylene, in particular to a method for catalyzing ethanol dehydration to ethylene with H-type mordenite molecular sieve that selectively removes 12-membered ring pore skeleton aluminum as a catalyst, and belongs to the field of catalytic chemical industry. Background technique [0002] Ethylene is the most basic chemical raw material, about 75% of petrochemical products come from ethylene. The industrial production scale, output and technology of ethylene have become an important symbol of the development level of a country's chemical industry. At present, petroleum-based ethylene is still the most advantageous and perfect industrial production route, but its reaction temperature is usually as high as 850°C, and the energy consumption is high. With the depletion of petroleum resources, the ethylene industry using petroleum as raw material is bound to be greatly affected. shock. It is als...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/20C07C11/04B01J29/18B01J37/10B01J37/08
CPCB01J29/18B01J37/08B01J37/10B01J2229/16C07C1/20C07C11/04Y02P20/52Y02P30/20Y02P30/40
Inventor 郅玉春魏迎旭刘中民林杉帆王男
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI