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A kind of method of propane dehydrogenation producing propylene

A technology for propane dehydrogenation and propylene, which is applied in the field of propane dehydrogenation to propylene, which can solve the problems of unstable propane catalyst and low conversion rate of propylene selectivity, and achieve the effect of high selectivity and good stability

Active Publication Date: 2020-06-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for propane dehydrogenation to propylene in order to overcome the disadvantages of unstable catalyst, low conversion rate of propane and low selectivity of propylene when adopting the existing method for propane dehydrogenation to propylene

Method used

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  • A kind of method of propane dehydrogenation producing propylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This example is used to illustrate the method for producing propylene from propane dehydrogenation provided by the present invention.

[0036] (1) Preparation of carrier

[0037] Take 0.20L of 1.0mol / L nitric acid aqueous solution, add 1.5g of lanthanum nitrate, add 100g of pseudo-boehmite and 200g of boehmite, knead in a kneader for 30min, then extrude into 3mm strips, after drying, 900 ℃ roasting to obtain the catalyst support Z1, based on the total amount of the support and in terms of elements, the mass composition of the support Z1 is 0.2% La-Al 2 o 3 , the carrier has been detected by XRD, and its main crystal phases are δ and θ types, wherein the content of δ and θ types of alumina is greater than 95%.

[0038] (2) Preparation of catalyst

[0039] Add 50g of chromium trioxide and 1g of potassium nitrate into 110mL of water to make an impregnating solution. Immerse 150g of the above-mentioned carrier Z1 in the impregnating solution at room temperature for 0.5h,...

Embodiment 2

[0044] This example is used to illustrate the method for producing propylene from propane dehydrogenation provided by the present invention.

[0045] (1) Preparation of carrier

[0046] Take 0.20L of 1.0mol / L nitric acid aqueous solution, add 1.4g of cerium nitrate, add 100g of pseudo-boehmite and 200g of boehmite, knead in a kneader for 30min, then extrude into 3mm strips, after drying, 900 ℃ roasting to obtain the catalyst support Z2, based on the total amount of the support and in terms of elements, the mass composition of the support Z2 is 0.2% Ce-Al 2 o 3 The carrier is detected by XRD, and its main crystal phases are δ and θ types, wherein the content of δ and θ types of alumina is greater than 95%.

[0047] (2) Preparation of catalyst

[0048] Add 50g of chromium trioxide and 2.4g of magnesium nitrate to 110mL of water to make an impregnating solution. Immerse 150g of the above-mentioned carrier Z2 in the impregnating solution at room temperature for 0.5h, and then r...

Embodiment 3

[0053] This example is used to illustrate the method for producing propylene from propane dehydrogenation provided by the present invention.

[0054] (1) Preparation of carrier

[0055] Take 0.20L of 1.0mol / L nitric acid aqueous solution, add 3.0g of lanthanum nitrate, add 100g of pseudo-boehmite and 200g of boehmite, knead in a kneader for 30min, then extrude into 3mm strips, after drying, 900 ℃ roasting to obtain the catalyst support Z3, based on the total amount of the support and in terms of elements, the mass composition of the support Z3 is 0.4% La-Al 2 o 3 , the carrier has been detected by XRD, and its main crystal phases are δ and θ types, wherein the content of δ and θ types of alumina is greater than 95%.

[0056] (2) Preparation of catalyst

[0057] Add 23g of chromium trioxide and 3.9g of sodium nitrate into 110mL of water to make an impregnating solution. Immerse 150g of the above-mentioned carrier Z1 in the impregnating solution at room temperature for 1 hour...

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Abstract

The invention provides a method for preparing propylene through propane dehydrogenation. The method comprises the steps that propane and a dehydrogenation catalyst perform contact reaction, wherein the catalyst contains a carrier, an active component and an additive, the active component and the additive are supported on the carrier, the carrier is aluminum oxide containing a modifying agent, the modifying agent is one or more of rare-earth metal components, the active component is chromium, and the additive is a metal component containing boron and alkali or a metal component containing boron and alkaline earth. When propane-dehydrogenation propylene preparing reaction is performed by adopting the method for preparing the propylene through propane dehydrogenation, high propane conversion rate and propylene selectivity can be obtained, and the used catalyst has high stability.

Description

technical field [0001] The invention relates to a method for producing propylene from propane dehydrogenation. Background technique [0002] With the popularization and use of civil natural gas, the effective use of liquefied gas in refineries has attracted more and more attention; the development of shale gas also produces a large amount of condensate, which is mainly composed of low-carbon alkanes. Its chemical utilization can effectively utilize resources and also received widespread attention. Propane dehydrogenation to propylene (PDH) is one of the important ways to produce chemical raw materials from liquefied gas and shale gas condensate. The production of propane through oxygen-free dehydrogenation of propane has been industrialized at home and abroad, and nearly twenty sets of devices are in industrial operation. Its catalytic system mainly consists of Cr-based catalysts and Pt-based catalysts. Compared with noble metal catalysts, Cr-based catalysts have lower req...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C5/333C07C11/06B01J23/26
CPCB01J23/002B01J23/26B01J2523/00C07C5/3332C07C2523/26C07C11/06B01J2523/67B01J2523/13B01J2523/3706B01J2523/31B01J2523/22B01J2523/3712B01J2523/12B01J2523/23Y02P20/52
Inventor 杜志国王国清金立张永刚
Owner CHINA PETROLEUM & CHEM CORP