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Metathesis catalysts and methods for the production of olefins

A technology of metathesis catalyst and linear olefin, applied in molecular sieve catalysts, chemical instruments and methods, including molecular sieve catalysts, etc., can solve problems such as reducing the yield of propylene products, and achieve the effect of prolonging catalyst life and long reaction cycle

Active Publication Date: 2021-05-25
SMH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the presence of hydrogen leads to hydrogenation of the propylene product, thus reducing the yield of propylene product

Method used

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  • Metathesis catalysts and methods for the production of olefins

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preparation example Construction

[0033] The object of the present invention is further achieved by the metathesis catalyst of the present invention, which is obtainable by the following preparation method, the preparation method comprising: a) mixing an inorganic carrier with a zeolite to obtain their mixture; b) mixing an inorganic carrier with a zeolite; depositing a transition metal on a mixture of zeolites to obtain a deposited mixture; and c) mixing the deposited mixture with a layered double hydroxide to obtain a metathesis catalyst.

[0034] Mixtures of inorganic supports and zeolites can be readily obtained by physical mixing. Metal deposition techniques may be conventional in the art without limitation. Typically, a transition metal compound is impregnated on a mixture of an inorganic support and a zeolite.

[0035] In a specific embodiment, the metal deposition mixture is dried and / or calcined prior to mixing with the layered double hydroxide. Drying and calcination methods are not particularly li...

Embodiment 1

[0044] Example 1 [Compare]

[0045] The WO containing 9wt% on the silica support 3 The metathesis catalyst was loaded into a tubular reactor. Take 1.4hr -1 A feed stream comprising ethylene and 2-butene was fed to the reactor and the catalyst bed was controlled at 350 °C and 22 bar gauge pressure at a weight hourly space velocity (WHSV).

[0046] The effluent from the reactor was analyzed. At 5 hours on stream, the n-butene conversion was 54% and the propylene selectivity was 92%. At 15 hours on stream, the n-butene conversion was 27% and the propylene selectivity was 89%. The average 1,3-butadiene formation was 170 ppm and the average C5+ formation was less than 5 wt% relative to the total effluent stream.

Embodiment 2

[0047] Example 2 [Compare]

[0048] By adding 9wt% WO on the silica support at a weight ratio of 10:1 3 with Mg-Al-CO 3 Layered double hydroxides are physically mixed to give metathesis catalysts. The catalyst was loaded into the tubular reactor. Take 1.4hr- 1 A feed stream comprising ethylene and 2-butene was fed to the reactor and the catalyst bed was controlled at 350 °C and 22 bar gauge pressure at a weight hourly space velocity (WHSV).

[0049] The effluent from the reactor was analyzed. At 5 hours on stream, the n-butene conversion was 65% and the propylene selectivity was 94%. At 15 hours on stream, the n-butene conversion was 47% and the propylene selectivity was 90%. The average 1,3-butadiene formation was 198 ppm and the average C5+ formation was less than 5 wt% relative to the total effluent stream.

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Abstract

The present invention provides a catalyst comprising a transition metal, an inorganic support, a zeolite and a layered double hydroxide. The use of catalysts according to the invention in olefin production processes exhibits high activity and high selectivity with reduced deactivation rates, thus enabling longer reaction cycles and prolonging catalyst life.

Description

technical field [0001] The present invention relates to catalysts and processes for the production of olefins by olefin metathesis. Background technique [0002] Metathesis is one of the important reactions in the petrochemical industry, especially the cross-metathesis of ethylene and butene, which is an economical means of producing propylene in high demand. [0003] In a typical industrial metathesis process, the metathesis catalyst deactivates over time and thus requires periodic regeneration. Regeneration methods usually involve treating the deactivated catalyst with an oxidizing gas at high temperature to burn off toxic substances and severe deposits formed during the reaction. The number of times the catalyst is subjected to such a regeneration process is limited, since the severe conditions employed may alter some specific properties of the catalyst, such as surface area, thus reducing its efficiency. [0004] It was found that during the reaction of ethylene and bu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01J23/02B01J23/32B01J23/24B01J29/16B01J27/232B01J29/076B01J29/78B01J29/48B01J29/69B01J27/25B01J37/02B01J37/08B01J37/04B01J38/12C07C6/04C07C11/06
CPCB01J23/007B01J23/02B01J23/24B01J23/30B01J23/32B01J27/232B01J27/25B01J29/076B01J29/163B01J29/166B01J29/48B01J29/69B01J29/7815B01J29/7876B01J37/0201B01J37/04B01J37/08B01J38/12C07C6/04C07C2523/30C07C2521/04C07C2521/08C07C2521/10C07C2529/16C07C2529/08C07C2527/232C07C11/06Y02P20/584Y02P20/52B01J35/0006B01J37/0018
Inventor 孔吉·苏里耶布林·克黑姆通迈特科恩·桑瓦尼奇
Owner SMH CO LTD
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