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Process for production of light olefins from hydrocarbon feedstock

A technology for light olefins and hydrocarbon raw materials, applied in the direction of hydrocarbon cracking, hydrocarbon oil treatment, hydrocarbon oil treatment products, etc., can solve the problems of structural collapse, easy deactivation of catalysts, dealumination of tetrahedral framework, etc., and achieve high cracking The effect of activity and excellent reactivity

Active Publication Date: 2008-07-30
SK INNOVATION CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A problem with porous solid acid catalysts such as zeolites used in these catalytic cracking methods is that, when the catalyst is placed in a steam atmosphere exceeding 500°C, dealumination of its tetrahedral framework occurs, causing its structure to collapse, And at the same time, the acid sites of the solid acid catalyst will be reduced, which will rapidly reduce the activity and reactivity of the catalyst.
Since no steam or inert gas is supplied during the reaction, the catalyst has excellent initial activity, but the catalyst may be easily deactivated in high temperature reactions in the presence of steam

Method used

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  • Process for production of light olefins from hydrocarbon feedstock
  • Process for production of light olefins from hydrocarbon feedstock
  • Process for production of light olefins from hydrocarbon feedstock

Examples

Experimental program
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preparation example Construction

[0045] Although the description of the preparation of molecular sieve catalysts is not to be bound by a particular theory, it is believed that, as shown in Reaction Schemes 1 and 2 below, modification of -Si-OH-Al-groups forming molecular sieves using phosphate compound / metal composite structures Therefore, it is concentrated by the protons of zeolite. In this way, the ≡P=O group stabilizes the unstable Al, and at the same time, the two -OH groups are also stabilized by the metal. Therefore, even in high temperature and high humidity environments In this case, the skeleton structure can also be relatively stably maintained.

[0046] Reaction scheme 1

[0047]

[0048] Reaction scheme 2

[0049]

[0050] The methods for preparing porous molecular sieve catalysts can be broadly classified into two methods involving a step of removing water contained in the above raw material mixture by selective evaporation to recover a solid product.

[0051] A method of preparing a cat...

Embodiment 1

[0077] A) Preparation of catalyst

[0078] Add 10 g of HZSM-5 (Zeolyst) with a Si / Al molar ratio of 25 and 0.55 g of concentrated phosphoric acid (85% H 3 PO 4 ), and stirred for 20 minutes. To the stirred solution was added 0.36 g of Mg(OH) 2 , and the pH of the mixture was adjusted to 7-8 with ammonia water, followed by stirring at about 45° C. for about 20 minutes. The mixture was then stirred at about 50°C until the water was completely evaporated, then the solid product was isolated by vacuum filtration. The isolated solid product was calcined in air at 500 °C for 5 hours to obtain Mg-HPO 4 - HZSM-5 catalyst.

[0079] B) Procedure for steam treatment to evaluate hydrothermal stability

[0080] In order to evaluate the hydrothermal stability of the catalyst, the catalyst was placed in a 100% steam atmosphere at 750°C for 24 hours.

[0081] C) Preparation of light olefins

[0082] As shown in Figure 1, a kind of system that detects catalyst activity in the process o...

Embodiment 2

[0086] A) Preparation of catalyst

[0087] Add 10 g of HZSM-5 (Zeolyst) with a Si / Al molar ratio of 25 and 0.26 g of concentrated phosphoric acid (85% H 3 PO 4 ), and stirred for about 20 minutes. To the stirred solution was added 0.08 g of Mg(OH) 2 , and the pH of the mixture was adjusted to 2-3 with aqueous nitric acid, followed by stirring at about 45° C. for about 20 minutes. The mixture was stirred at about 50°C until the water was completely evaporated, then the solid product was isolated by vacuum filtration. The isolated solid product was calcined in air at 500°C for 5 hours to obtain Mg-H 2 PO 4 - HZSM-5 catalyst.

[0088] B) Procedure for steam treatment to evaluate hydrothermal stability

[0089] The steam treatment step was performed in the same manner as in Example 1.

[0090] C) Preparation of light olefins

[0091] Light olefins were prepared in the same manner as in Example 1.

[0092] The results obtained for conversion, selectivity of light olefins ...

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Abstract

Disclosed is a process for producing light olefins from hydrocarbon feedstock. The process is characterized in that a porous molecular sieve catalyst consisting of a product obtained by evaporating water from a raw material mixture comprising a molecular sieve with a framework of -Si-OH-Al- groups, a water-insoluble metal salt, and a phosphate compound, is used to produce light olefins, particularly ethylene and propylene, from hydrocarbon, while maintaining excellent selectivity to light olefins. According to the process, by the use of a specific catalyst with hydrothermal stability, light olefins can be selectively produced in high yield with high selectivity from hydrocarbon feedstock, particularly full-range naphtha. In particular, the process can maintain higher cracking activity than the reaction temperature required in the prior thermal cracking process for the production of light olefins, and thus, can produce light olefins with high selectivity and conversion from hydrocarbon feedstock.

Description

technical field [0001] The present invention relates to a method for producing light olefins from hydrocarbon raw materials, and in particular, to a method for producing light olefins from hydrocarbon raw materials with high yield and high selectivity using a catalyst that can be used even in an atmosphere of high temperature and high humidity still has a relatively stable structure, so it maintains its catalytic activity for a long time and shows thermal stability. Background technique [0002] Olefins, especially light olefins such as ethylene and propylene, are widely used in the petrochemical industry. [0003] These light olefins are usually produced by thermally cracking naphtha (steam cracking) in the presence of steam. In many areas, steam cracking technology is being improved to cope with high processing temperatures and reduced residence time, and to optimize energy efficiency. However, it is not easy to improve energy efficiency only by simple operation techniqu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G11/05C07C4/06
CPCC07C4/06C10G11/05C10G11/187C10G2300/1044C10G2400/20
Inventor 崔先金容昇朴德守金奭俊梁一模金希永朴镛基李哲伟崔源春高光安姜拏永
Owner SK INNOVATION CO LTD
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