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Method for preparing ethylene through ethanol catalytic dehydration

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

Inactive Publication Date: 2013-04-10
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 producing ethylene by catalytic dehydration of ethanol is provided

Method used

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  • Method for preparing ethylene through ethanol catalytic dehydration
  • Method for preparing ethylene through ethanol catalytic dehydration
  • Method for preparing ethylene through ethanol catalytic dehydration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Mix 40% silica sol, sodium metaaluminate, tetrapropylammonium bromide TPABr, sodium chloride, sodium hydroxide and water, stir for 20 minutes, then add polyethylene glycol (molecular weight is 6000), stir for 20 minutes, Put it into a reaction kettle, and conduct dynamic crystallization (200 rpm) at 170°C for 3 days. 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-5 zeolite raw powder. The molar ratio of each raw material in the reaction mixture is: SiO 2 / Al 2 o 3 =80.0,H 2 O / SiO 2 =50.8, NaCl / SiO 2 =0.68, NaOH / SiO 2 =0.15, TPABr / SiO 2 =0.40, polyethylene glycol mass / SiO 2 Mass = 0.1.

[0026] figure 1 It is the XRD pattern of the zeolite, showing typical ZSM-5 crystal phase characteristics. figure 2 This is the SEM photo of the zeolite, the crystal grain diameter is 0.2 micron. The micropore volume of the zeolite is 0.12 cm 3 / g, the mesopore volume is 0.37 cm 3 / g,...

Embodiment 2

[0030] According to the steps and conditions of [Example 1], only SiO in the synthetic formula 2 / Al 2 o 3 =40.0, 1,6-hexanediamine is used as template agent, starch is used as mesoporous pore-forming agent, starch mass / SiO 2 Mass = 1, crystallization temperature 200°C for 5 days. The parameters of the synthesized zeolite are shown in Table 1. Same as [Example 1] ammonium exchange, drying, roasting, molding to obtain the catalyst.

[0031] The catalyst performance was evaluated according to the conditions of [Example 1]. The specific reaction conditions and results are shown in Table 2.

Embodiment 3

[0033] According to the steps and conditions of [Example 1], only the raw materials and the proportioning ratio of ingredients are different in the synthetic formula. The aluminum source is aluminum sulfate, the silicon source is water glass, and the template agent is tetrapropylammonium hydroxide. The molar ratio of each raw material in the reaction mixture is: SiO 2 / Al 2 o 3 =176.9,H 2 O / SiO 2 =28.15, NaCl / SiO 2 =0.80, NaOH / SiO 2 = 0.39, TPAOH / SiO 2 =0.19, the crystallization temperature was 150°C for 5 days. Mesoporous pore former is dextrin, dextrin mass / SiO 2 quality=5. The parameters of the synthesized zeolite are shown in Table 1. Same as [Example 1] ammonium exchange, drying, roasting, molding to obtain the catalyst.

[0034] 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 through ethanol catalytic dehydration and mainly solves the problem of poor reaction stability in the prior part. According the method, ethanol with the weight percentage concentration being 5 to 100 percent is used as raw materials, reaction raw materials and catalysts are in contact to generate ethylene under the conditions that the reaction temperature is 200 to 400 DEG C, and the volume space velocity relative to the ethanol is 0.1 to 15 h<-1>, wherein the used catalysts are MSM-5 zeolite, the MSM-5 zeolite has the crystal grain diameter being smaller than or equal to 5 microns and simultaneously has mesoporouses and micropores, and the mesoporous volume / micropore volume value of the MSM-5 zeolite is 1.5 to 10. Through the technical scheme, the problems are perfectly solved, and the preparation method can be used in the industrial production of ethylene preparation through ethanol dehydration.

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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IPC IPC(8): C07C11/04C07C1/24B01J29/40
CPCY02P20/52
Inventor 李亚男徐菁金照生杨为民
Owner CHINA PETROLEUM & CHEM CORP
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