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Method for preparing ethylene by dehydrating ethanol

A technology for ethanol dehydration and ethylene, applied in chemical instruments and methods, hydrocarbon production from oxygen-containing organic compounds, molecular sieve catalysts, etc., can solve problems such as poor reaction stability

Active Publication Date: 2015-07-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 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 ethanol dehydration to ethylene is provided

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Mix 40% silica sol, sodium metaaluminate, tetrabutylammonium bromide, potassium chloride, sodium hydroxide and water, stir for 20 minutes, then add polyethylene glycol (molecular weight is 6000), stir for 20 minutes, load Put it into a reaction kettle, and crystallize at 170°C for 1 day. The crystallized product was quenched, filtered, washed with water until the pH value was 8, and dried at 120°C for 12 hours to obtain the original ZSM-11 molecular sieve powder. The molar ratio of each raw material in the reaction mixture is: SiO 2 / Al 2 o 3 =149.3,H 2 O / SiO 2 =32.8, KCl / SiO 2 =0.6, NaOH / SiO 2 = 0.08, TBABr / SiO 2 =0.12, polyethylene glycol mass / SiO 2 Mass = 0.1.

[0026] figure 1 It is the XRD pattern of the zeolite, showing typical ZSM-11 crystal phase characteristics. figure 2 This is the SEM photograph of the zeolite, with an average grain size of 0.3 microns. The micropore volume of the zeolite is 0.12 cm 3 / g, the mesopore volume is 0.38 cm 3 / g, the ...

Embodiment 2

[0030] Mix 40% silica sol, sodium metaaluminate, tetrabutylammonium bromide, sodium chloride, sodium hydroxide and water, stir for 20 minutes, then add starch, stir for 20 minutes, put it into a reaction kettle, crystallize at 170°C 1 day. The crystallized product was quenched, filtered, washed with water until the pH value was 8, and dried at 120°C for 12 hours to obtain ZSM-11 molecular sieve raw powder with an average grain diameter of 0.5 microns. The molar ratio of each raw material in the reaction mixture is: SiO 2 / Al 2 o 3 =149.3,H 2 O / SiO 2 =32.8, NaCl / SiO 2 =0.6, NaOH / SiO 2 = 0.08, TBABr / SiO 2 =0.12, starch / SiO 2 mass=1. The parameters of the synthesized zeolite are shown in Table 1.

[0031] The synthesized ZSM-11 molecular sieve raw powder was treated with 0.3 mol / L hydrochloric acid at 80°C for 4 hours for 3 consecutive times to obtain HZSM-11.

[0032] The catalyst performance was evaluated according to the conditions of [Example 1]. The specific react...

Embodiment 3

[0034] According to the steps and conditions of [Example 2], only the mesoporous pore-forming agent is dextrin, dextrin / SiO 2 Quality = 5, SiO in the synthesis formula 2 / Al 2 o 3 =52.3, tetrabutylammonium hydroxide was used as template agent, and the crystallization temperature was 120°C for 8 days. The parameters of the synthesized zeolite are shown in Table 1. With [Example 1] ammonium exchange, drying, roasting.

[0035] The catalyst performance was evaluated according to the conditions of [Example 1]. The specific reaction conditions and results are shown in Table 2.

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Abstract

The invention relates to a method for preparing ethylene by dehydrating ethanol and mainly aims to solve the problem of poor reaction stability in the prior art. The method comprises the step of making a raw material to contact and react with a catalyst to generate ethylene 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 ZSM-11 zeolite with mesopores and micropores, wherein the ratio of the volume of the mesopores to the volume of the micropores of the ZSM-11 zeolite is 1.5-10, and the diameter of the crystalline grain of the catalyst is not more than 5 microns. 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 dehydrating 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 raw materials i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/04C07C1/24B01J29/40B01J35/10
CPCY02P20/52
Inventor 李亚男徐菁金照生周海春杨为民
Owner CHINA PETROLEUM & CHEM CORP
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