Method for preparing ethylene by dehydrating ethanol under catalysis

A technology for catalytic dehydration and ethanol, applied in chemical instruments and methods, molecular sieve catalysts, and hydrocarbon production from oxygen-containing organic compounds, etc., can solve the problems of poor reaction stability, etc., to inhibit the formation of carbon deposits and reduce the rate of carbon deposits , the effect of eliminating the influence of diffusion

Active Publication Date: 2013-05-29
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0011] The technical problem to be solved by the present invention is that there is a problem of poor reaction stability in the prior art, and a new method for preparing ethylene by catalytic dehydration of ethanol is provided

Method used

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  • Method for preparing ethylene by dehydrating ethanol under catalysis
  • Method for preparing ethylene by dehydrating ethanol under catalysis

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Experimental program
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Effect test

Embodiment 1

[0024] Weigh 7.4 grams of silica sol (SiO 2 Weight content 40%), add sodium metaaluminate, 40% sodium hydroxide aqueous solution again, make molar ratio be: 6.36Na 2 O:Al 2 o 3 : 80.22SiO2 2 , and add water to mix, knead and extrude. After that, it was dried at 100° C. for 1 hour, and then pelletized. A mixture of 2 grams of tetrabutylammonium bromide and 10 grams of distilled water was added in advance in the reaction kettle, a stainless steel mesh was placed above the mixture, the formed molecular sieve was placed on the stainless steel mesh, and the reaction kettle was sealed. The reactor was subjected to gas-solid phase treatment at 150°C for 10 days. After the product was taken out, it was washed with water, dried at 120°C for 10 hours, and then baked at 550°C for 5 hours to remove the template agent. For the XRD characterization results of the sample, see figure 1 . Afterwards, the obtained material was exchanged three times with 10% by weight ammonium nitrate aqueo...

Embodiment 2

[0027] Weigh 7.4 grams of silica sol (SiO 2 40% by weight), then add sodium metaaluminate, 40% aqueous sodium hydroxide solution, so that the molar ratio is: 8Na 2 O:Al 2 o 3 : 100SiO2 2 , and add water to mix, knead and extrude. Thereafter, it was dried at 120° C. for 1 hour, and then pelletized. Add a mixture of 2 grams of tetrabutylammonium hydroxide and 10 grams of distilled water in advance in the reaction kettle, place a stainless steel mesh above the mixture, place the formed molecular sieve on the stainless steel mesh, and seal the reaction kettle. The reactor was subjected to gas-solid phase treatment at 170°C for 5 days. After the product was taken out, it was washed with water, dried at 120°C for 10 hours, and then baked at 550°C for 5 hours to remove the template. Afterwards, the obtained material was exchanged three times with 10% by weight ammonium nitrate aqueous solution at 80° C., washed twice with water, dried at 120° C. for 10 hours, and calcined at 55...

Embodiment 3

[0030] Weigh 7.4 grams of silica sol (SiO 2 40% by weight), then add sodium metaaluminate, 40% aqueous sodium hydroxide solution, so that the molar ratio is: 4Na 2 O:Al 2 o 3 : 60SiO 2 , and add water to mix, knead and extrude. After that, it was dried at 120° C. for 2 hours and cut into pellets. A mixture of 7 grams of tetrabutylammonium hydroxide and 10 grams of distilled water was added to the reaction kettle in advance, a stainless steel mesh was placed above the mixture, the formed molecular sieve was placed on the stainless steel mesh, and the reaction kettle was sealed. The reactor was subjected to gas-solid phase treatment at 180°C for 3 days. After the product was taken out, it was washed with water, dried at 120°C for 10 hours, and then baked at 550°C for 5 hours to remove the template. Afterwards, the obtained material was exchanged three times with 10% by weight ammonium nitrate aqueous solution at 80° C., washed twice with water, dried at 120° C. for 10 hour...

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Abstract

The invention relates to a method for preparing ethylene by dehydrating ethanol under catalysis and mainly aims to solve the problem of poor reaction stability in the prior art. The method comprises the step of making a reaction raw material to contact a catalyst under the conditions that the temperature is 200-400 DEG C and the space velocity relative to the volume of the ethylene is 0.1-15h<-1>, wherein the raw material is the ethanol with the concentration of 5-100% by mass, and the catalyst is a binderless ZSM-11 molecular sieve. The technical scheme well solves the problem of poor reaction stability in the prior art and can be used for the industrial production of the ethylene by dehydrating the ethanol.

Description

technical field [0001] The invention relates to a method for preparing ethylene by catalytic dehydration of ethanol. Background technique [0002] As a basic organic chemical raw material and a leading product in the petrochemical industry, ethylene is known as the "mother of petrochemical industry". It is mainly used in the production of polyethylene, ethylene oxide / ethylene glycol, dichloroethane, styrene, acetic acid Chemicals such as ethylene. With the rapid development of ethylene derivative industries such as chemical industry, energy and materials, the demand for ethylene is increasing. At present, ethylene mainly comes from naphtha cracking. 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 plant starch or wood fiber. The source of ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C1/24B01J29/40
CPCY02P20/52
Inventor 李亚男徐菁黄祖娟金照生杨为民
Owner CHINA PETROLEUM & CHEM CORP
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