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Method for preparing ethylene through ethanol dehydration

A technology for ethanol dehydration and ethylene, applied in chemical instruments and methods, hydrocarbon production from oxygen-containing organic compounds, including molecular sieve catalysts, etc., can solve problems such as poor stability and short catalyst service life, and achieve improved catalytic activity and stability. The effect of uniformity, acid distribution and moderate acidity

Active Publication Date: 2018-06-01
李宝尔
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In 2012, Liu Juntao of China Petrochemical Corporation (CN102649664A, CN102649666) reported the use of ZSM-5 molecular sieves with a specific silicon-to-aluminum ratio (40-400, 20-200) as a catalyst. In order to achieve 100%, the ethylene selectivity can reach more than 95%, but the service life of the catalyst is very short
[0007] In summary, the zeolite catalysts used in the past have the disadvantage of poor stability.

Method used

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  • Method for preparing ethylene through ethanol dehydration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Fully mix commercially available H-NaZSM-5 molecular sieves with deionized water to prepare slurry I; mix sodium metaaluminate, phosphoric acid, 40% silica sol, and distilled water according to n(Al):n(P):n(Si) : n(H 2 O) the molar ratio is 1:1:0.1:40 mixing, stirring for 20 minutes, to obtain gel II; slurry I is added in gel II, stirring for 30 minutes, according to the molar ratio n (template agent): n (P) is 2:1 Add the template agent isopropylamine, continue to stir until a uniform gel is formed, put the gel into the reaction kettle, and crystallize at 170°C for 1 day. The crystallized product was quenched, filtered, and washed with water until the pH value was 8, dried at 120°C for 12 hours, and roasted in a muffle furnace at 550°C to remove the template agent to obtain Synthetic Catalyst A, which was characterized by SEM with an average grain size of 5 microns .

[0024] The performance evaluation of the catalyst was carried out on a fixed-bed reaction device at...

Embodiment 2

[0026] Fully mix commercially available H-NaZSM-5 molecular sieves with deionized water to obtain slurry I; divide pseudo-boehmite, phosphoric acid, water glass, and distilled water into n(Al): n (P): n(Si): n(H 2 O) the molar ratio is 1:1:0.1:40 mixing, stirring for 20 minutes, to obtain gel II; slurry I is added in gel II, stirring for 30 minutes, according to the molar ratio n (template agent): n (P) is 2:1 Add the template agent isopropylamine, continue to stir until a uniform gel is formed, put the gel into the reaction kettle, and crystallize at 170°C for 1 day. The crystallized product was quenched, filtered, and washed with water until the pH value was 8, dried at 120°C for 12 hours, and roasted in a muffle furnace at 550°C to remove the template agent to obtain Synthetic Catalyst B, which was characterized by SEM with an average grain size of 8 microns .

[0027]The performance evaluation of the catalyst was carried out on a fixed-bed reaction device at normal press...

Embodiment 3

[0029] Fully mix commercially available H-NaZSM-5 molecular sieves with deionized water to prepare slurry I; mix sodium metaaluminate, phosphoric acid, 40% silica sol, and distilled water according to n(Al):n(P):n(Si) : n(H 2 O) the molar ratio is 1:1:0.1:40 mixing, stirring for 20 minutes, to obtain gel II; slurry I is added in gel II, stirring for 30 minutes, according to the molar ratio n (template agent): n (P) is 2:1 Add the template agent triethylamine, continue to stir until a uniform gel is formed, put the gel into the reaction kettle, and crystallize at 170°C for 1 day. The crystallized product was quenched, filtered, and washed with water until the pH value was 8, dried at 120°C for 12 hours, and roasted in a muffle furnace at 550°C to remove the template agent to obtain Synthetic Catalyst C, which was characterized by SEM with an average grain size of 7 microns .

[0030] The performance evaluation of the catalyst was carried out on a fixed-bed reaction device at ...

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Abstract

The invention relates to a method for preparing ethylene through ethanol dehydration. According to the method, H-NaZSM-5 and SAPO-34 molecular sieves with different channels and acidities are compounded through a synthesis method, problems of each of the H-NaZSM-5 and SAPO-34 molecular sieves are overcome, and meanwhile the grain diameter of a composite catalyst is controlled to be not greater than 10 micrometers. The composite catalyst has a unique double-channel structure, high specific surface area and suitable acidity, is beneficial to the improvement of stability, ensures that both the ethanol conversion rate and the ethylene selectivity reach 99 percent or more when catalyzing ethanol dehydration to prepare ethylene, and the ethanol conversion rate and the ethylene selectivity stillkeep 96 percent after 100h of continuous reaction.

Description

technical field [0001] The invention relates to the technical field of ethylene preparation, in particular to a method for preparing ethylene by dehydrating ethanol. Background technique [0002] The production scale and technical level of ethylene are important symbols of the development level of a country's chemical industry. With the continuous development of the economy, my country has become a big country in demand and consumption of energy and resources, especially the demand for ethylene has been increasing at an average rate of 20% every year in recent years, but the output of ethylene is seriously insufficient, ethylene and its downstream The domestic market satisfaction rate of derivatives is less than 50% on average, requiring a large amount of imports. At present, the production method of ethylene at home and abroad mainly adopts naphtha cracking method, but with the increasingly tense relationship between global energy and resource supply and demand, this proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/24C07C11/04B01J29/85
CPCB01J29/005B01J29/40B01J29/85C07C1/24C07C2529/85C07C11/04Y02P20/52
Inventor 黑维梅
Owner 李宝尔
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