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Molecular sieve type solid acid catalyst for ethanol dehydration to ethylene and preparation and application thereof

A solid acid catalyst, ethanol dehydration technology, applied in molecular sieve catalysts, including molecular sieve catalysts, catalysts and other directions, can solve the problems of high ethanol raw material concentration requirements, harsh reaction conditions, high energy consumption and cost, and achieve high catalytic activity and selection. performance, low cost, and improved efficiency

Inactive Publication Date: 2017-05-10
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Alumina-type catalysts are relatively mature catalysts for ethanol dehydration to ethylene in the industry. The catalyst code-named Syndol developed by Halcon Corporation in the United States in the 1980s has the best performance, but this catalyst is compared with molecular sieve catalysts reported in the literature [Petrochemical Industry, 1987, 16(11): 764-768], the reaction conditions are harsh, the reaction temperature is high, and the ethanol raw material concentration is high, resulting in high overall energy consumption and cost

Method used

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  • Molecular sieve type solid acid catalyst for ethanol dehydration to ethylene and preparation and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Catalyst preparation

[0022] The ferric nitrate solution and the synthetic solution of hydrogen ZSM-5 molecular sieve are uniformly mixed under stirring, wherein, the Fe in the ferric nitrate solution 2 o 3 The mass ratio to molecular sieve is 0.1wt%; the above mixture is placed in a hydrothermal synthesis kettle for hydrothermal crystallization reaction at 150°C for 3 days, and dried at 100°C for 5h after hydrothermal crystallization; after the above drying The material was calcined at 400°C for 4 hours in a muffle furnace, and then fully ion-exchanged with a large amount of ammonium nitrate solution. After the ion exchange, it was calcined at 400°C for 4 hours in a muffle furnace to obtain a solid acid FeZSM-5 modified catalyst.

Embodiment 2

[0024] Catalyst preparation:

[0025] Mix the ferric sulfate solution and the synthetic solution of the hydrogen type ZSM-5 molecular sieve evenly under stirring, wherein, the Fe in the ferric nitrate solution 2 o 3 The mass ratio to molecular sieves is 2wt%; the above mixture is placed in a hydrothermal synthesis kettle for hydrothermal crystallization reaction at 160°C for 5 days, and dried at 120°C for 7h after hydrothermal crystallization; the above dried substance Put it in a muffle furnace and roast at 450°C for 5 hours, carry out sufficient ion exchange with an amount of ammonium nitrate solution, and after ion exchange, roast it in a muffle furnace at 450°C for 5 hours to obtain a solid acid FeZSM-5 modified catalyst.

Embodiment 3

[0027] Catalyst preparation:

[0028] Mix the ferric sulfate solution and the synthetic solution of the hydrogen type ZSM-5 molecular sieve evenly under stirring, wherein, the Fe in the ferric nitrate solution 2 o 3 The mass ratio to molecular sieves is 10wt%; the above mixture is placed in a hydrothermal synthesis kettle for hydrothermal crystallization reaction at 170°C for 7 days, and dried at 150°C for 10h after hydrothermal crystallization; the above dried substance Place it in a muffle furnace for 6 hours at 500°C, carry out sufficient ion exchange with a large amount of ammonium nitrate solution, and after ion exchange, place it in a muffle furnace for 6 hours at 500°C to obtain a solid acid FeZSM-5 modified catalyst.

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Abstract

The invention belongs to the technical field of preparation of chemical products and particularly relates to a molecular sieve type solid acid catalyst for ethanol dehydration to ethylene and preparation and application thereof; the catalyst comprises an active component and a support, wherein the active component accounts for 0.1-15% by weight of the support and is iron, and the support is hydrogen molecular sieve. The preparation method includes a direct hydrothermal method to prepare the molecular sieve type solid acid catalyst, and under the action of the molecular sieve type solid acid catalyst, dehydration of ethanol at low temperature to ethylene. The catalyst for ethanol dehydration to ethylene according to the invention may be applied to dehydration of different concentrations of ethanol to ethylene, the conversion rate is up to 99%, and selectivity is up to 98%; the catalyst has high low-temperature activity, and the technical problems of existing industrial product, such as high temperature and low air velocity, are solved.

Description

technical field [0001] The invention belongs to the technical field of chemical product preparation, and in particular relates to a molecular sieve solid acid catalyst for ethanol dehydration to ethylene and its preparation and application. Background technique [0002] Ethylene is the most basic chemical raw material, about 75% of petrochemical products come from ethylene. Ethylene is mainly used in the production of chemicals such as polyethylene, polyvinyl chloride, ethylene oxide, ethylene dichloride, styrene, and vinyl acetate. With the rapid development of ethylene derivative industries such as chemical industry and energy, the demand for ethylene is constantly increasing. At present, ethylene is mainly produced from petroleum through catalytic cracking, and the reaction temperature is usually as high as 850°C. With the increasing depletion of oil resources and rising oil prices, the ethylene industry, which uses oil as raw material, is bound to suffer a huge impact....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/46B01J29/76C07C1/24C07C11/04
CPCY02P20/52B01J29/46B01J29/76B01J2229/18C07C1/24C07C2529/46C07C2529/76C07C11/04
Inventor 辛洪川李学兵孙媛媛
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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