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Dehydration catalyst, method for preparing same, and method for preparing olefin using same

A technology for dehydration catalysts and olefins, applied in the direction of catalyst activation/preparation, catalysts, carbon compound catalysts, etc., can solve the problems of reduced specific surface area of ​​alumina dispersant, reduced usefulness of alumina crystal phase, reduced activity, etc., to achieve Excellent catalytic activity, high selectivity, and the effect of improving process efficiency

Active Publication Date: 2022-03-11
LG CHEM LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Compared with the alumina crystal phase calcined at low temperature, the alumina crystal phase calcined at high temperature has high stability, but the alumina crystal phase calcined at high temperature has a problem that the inherent acid sites of alumina points and the large specific surface area as a dispersant is significantly reduced
Therefore, the usefulness of the alumina crystalline phase obtained by the high temperature calcination process is significantly reduced
[0008] Additionally, conventionally, only the gamma-phase alumina formed at lower temperatures exhibited effective activity as a catalyst for the dehydration of isopropanol, while theta- and alpha-phase aluminas formed at higher temperatures exhibited significantly reduced active

Method used

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  • Dehydration catalyst, method for preparing same, and method for preparing olefin using same
  • Dehydration catalyst, method for preparing same, and method for preparing olefin using same
  • Dehydration catalyst, method for preparing same, and method for preparing olefin using same

Examples

Experimental program
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Effect test

Embodiment 1

[0092] Calcining the boehmite at 950°C for 10 hours in an air atmosphere to obtain the first alumina, filling the first alumina into a tubular reactor, setting the temperature of the tubular reactor to 400°C, and then Steam treatment was performed by supplying water vapor and nitrogen to the reactor for 3 hours. At this time, water vapor was supplied at a rate of 0.026 to 0.1 g / min using an HPLC pump, nitrogen gas was supplied at a rate of 133 ml / min using a mass flow controller (MFC), and the mixing ratio of nitrogen to water vapor (N 2 :H 2 The volume ratio of O) is 2,500:1, and the weight ratio of water vapor to the first alumina is 0.01 to 100:1. In addition, after the steam treatment, it was calcined at 550° C. for 5 hours to obtain 5% by weight of α-alumina, 70% by weight of - Alumina catalysts for alumina.

Embodiment 2

[0094] This process was performed in the same manner as in Example 1 except that the primary calcination of boehmite was performed at 1100°C. As a result, an alumina catalyst comprising 10% by weight of α-alumina, 70% by weight of θ-alumina, 20% by weight of δ-alumina and 0% by weight of γ-alumina was obtained.

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Abstract

The invention relates to a dehydration catalyst, a preparation method thereof and a method for preparing olefin by using the catalyst. More specifically, the present invention relates to a dehydration catalyst, a method for preparing the dehydration catalyst, and a method for preparing an olefin using the dehydration catalyst, the dehydration catalyst being a mixed-phase alumina comprising 1 to 18 wt% of alpha-alumina, 65 to 95 wt% of theta-alumina, and 4 to 34 wt% of delta-alumina.

Description

[0001] [Cross Reference to Related Application] [0002] This application claims Korean Patent Application No. 10-2020-0074932 filed with the Korean Intellectual Property Office on June 19, 2020 and Korean Patent Application No. 10- Priority No. 2020-0147797, the disclosure of each of which is incorporated herein by reference. technical field [0003] The present invention relates to a dehydration catalyst, its preparation method and the method of using the catalyst to prepare olefins. More specifically, the present invention relates to a dehydration catalyst, a method for preparing the dehydration catalyst; and a method for producing olefins using the dehydration catalyst, the dehydration catalysis being characterized by high alcohol conversion, high olefin selectivity and by-product selectivity Excellent catalytic activity with low resistance and excellent mechanical properties such as crushing strength. Background technique [0004] In the catalyst industry, aluminum ox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A99Z99/00
CPCC07C11/06C07C5/48B01J21/04B01J37/08B01J37/0018Y02P20/52B01J35/60B01J35/613B01J35/633B01J2235/15B01J35/37B01J35/36B01J37/082B01J37/10C07C1/24C07C2521/04B01J35/635
Inventor 金贤斌千周暎琴永燮崔大兴
Owner LG CHEM LTD
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