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Preparation of composite modified catalyst and method for preparing biological ethane using same

A composite modification and bio-ethylene technology, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effect of simple operation process, simple equipment and low investment

Inactive Publication Date: 2007-03-07
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the present invention compositely modifies HZSM-5 by impregnation method, and uses it to prepare bio-ethylene by catalytic dehydration of bio-ethanol, with mild reaction conditions and high catalytic activity. At present, no research on this aspect has been reported yet.

Method used

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  • Preparation of composite modified catalyst and method for preparing biological ethane using same
  • Preparation of composite modified catalyst and method for preparing biological ethane using same
  • Preparation of composite modified catalyst and method for preparing biological ethane using same

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preparation example Construction

[0019] The invention includes the preparation of the composite modified catalyst and the method for the composite modified catalyst to prepare bio-ethylene. The composite modified catalyst is a solid acid catalyst mainly composed of HZSM-5 molecular sieve. HZSM-5 molecular sieve is used as the original powder, and Zn is respectively introduced by impregnation method. 2+ and Mn 2+ metal ions, then after roasting in a muffle furnace, obtain a composite modified Zn / Mn / ZSM-5 catalyst with higher catalytic activity after tableting, grinding, and sieving;

[0020] The method in which the composite modified catalyst is used to prepare bio-ethylene is to use bio-ethanol as a raw material, and self-prepared composite-modified Zn / Mn / ZSM-5 as a catalyst; in bio-ethanol, add a catalyst, and , feed inert gas, react for a certain period of time at a certain air velocity, reaction space velocity, and reaction temperature; and then obtain bio-ethylene after dehydration, and the conversion r...

Embodiment 1

[0025] The reactor is a fixed bed reactor, and the catalyst is compound modified Zn / Mn / ZSM-5 and unmodified ZSM-5 raw powder. At 400°C, the space velocity is 2.4h -1 When ZSM-5 raw powder catalyzed ethanol dehydration conversion rate was 95.54%, ethylene selectivity was 12.13%; ZSM-5 after complex modification, ethanol dehydration conversion rate was 99.97%, ethylene selectivity was 49.58%. It can be seen that the effect of compound modified ZSM-5 is obviously better than that of the original powder.

Embodiment 2

[0027] Modify the ZSM-5 catalyst with a silicon-aluminum weight ratio of 25, place the original HZSM-5 powder in a Zn-containing 2+ 2wt%, Mn 2+ 4wt% solution, modification time 1h, modification temperature 80°C, calcination temperature 550°C, to obtain composite modified Zn / Mn / ZSM-5 catalyst. In a self-developed fixed-bed reactor, add 4.0g of Zn / Mn / ZSM-5 catalyst at a temperature of 250°C and a space velocity of 1.0h -1 Next, the dehydration experiment was carried out on bioethanol, the ethanol conversion rate was 99.84%, and the ethylene selectivity could reach 90%.

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Abstract

The invention relates to a method for preparing composite modified catalyst, used to prepare biological ethane. Wherein, it comprises that preparing composite modified catalyst, and using said catalyst to prepare biological ethane; said catalyst uses HZSM-5 molecule screen as powder, uses emerge method to lead in Zn<2+ and Mn<2+ metal ion, to be baked, compressed, rolled, and screened, to obtain the composite modified Zn / Mn / ZSM-5 catalyst with high catalysis activity. And its application uses biological ethane as material, adds said catalyst, under normal pressure, controls airflow speed, reaction temperature and reaction time; dewaters to obtain biological ethane, while its transformation rate and selectivity are both higher then 95%. The invention has low cost and simple control.

Description

technical field [0001] The invention belongs to the field of catalyst preparation technology and bioenergy, and in particular relates to the preparation of a composite modified catalyst and a method for preparing bioethylene. Specifically, it relates to the preparation of a composite modified catalyst Zn / Mn / ZSM-5 and its technology for catalyzing the dehydration of bioethanol to prepare bioethylene. Background technique [0002] Ethylene is an important basic organic chemical raw material and the cornerstone of the petrochemical industry. At present, about 75% of chemical products use ethylene as raw material, and its output represents the development level of a country's organic chemical industry. Ethylene is widely used in the production of many important organic chemical products and polymers such as polyethylene, ethylene oxide / ethylene glycol, ethylene dichloride, styrene, ethanol, vinyl acetate, and propionaldehyde. In recent years, the demand for ethylene has been in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/48C07C11/04C07C1/24
CPCY02P20/52
Inventor 张建安吴玉龙潘锋程可可周玉杰刘宏娟杨明德刘德华
Owner TSINGHUA UNIV
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