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Catalyst for preparing propylene through C4 olefin cracking, and preparation method and use thereof

A carbon tetraolefin and catalyst technology, applied in the field of catalysts, can solve the problems of poor catalyst activity, olefin conversion rate and low propylene selectivity, and achieve good technical effects

Active Publication Date: 2014-10-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the technical problems to be solved by the present invention is the problems of poor catalyst activity, olefin conversion rate and low selectivity of propylene in the existing C4-olefin cracking to propylene reaction, and a new C4-olefin cracking to produce propylene is provided. When the catalyst is used in the reaction of C4 olefin cracking to propylene, it has the characteristics of high catalyst activity and high selectivity of product propylene

Method used

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  • Catalyst for preparing propylene through C4 olefin cracking, and preparation method and use thereof
  • Catalyst for preparing propylene through C4 olefin cracking, and preparation method and use thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Tetrapropylammonium bromide is used as template, aluminum nitrate is used as aluminum source, and silica sol is used as silicon source. 2 / Al 2 o 3 =200;OH － / SiO 2 =0.3; R / SiO 2 =0.5;H 2 O / SiO 2 = 40 mixed in a ratio of 40, hydrolyzed completely at room temperature, put into a stainless steel reactor, controlled the growth direction of molecular sieve crystals under hydrothermal conditions, and crystallized at 100°C for 60 hours to obtain the molar ratio of silicon to aluminum SiO 2 / Al 2 o 3 NaZSM-5 molecular sieve with a shape index of 200 and a shape index of 50.

[0029]Weigh 40 g of the above SiO 2 / Al 2 o 3 200, NaZSM-5 molecular sieve with a shape index of 50, 30 grams of silica sol (SiO 2 40% by weight), mixed with water, extruded into a mold with a diameter of 2.0mm, dried in the air, placed in an oven at 90°C for 10 hours, and baked in a muffle furnace at 550°C for 8 hours to remove the template agent. Exchanged three times in 5% ammonium nitrate...

Embodiment 2

[0032] Tetrapropylammonium hydroxide is used as a template, aluminum sulfate is used as an aluminum source, water glass is used as a silicon source, and raw materials are molar ratios of SiO 2 / Al 2 o 3 =500;OH － / SiO 2 =0.05; R / SiO 2 =1.5;H 2 O / SiO 2 = 10, using the method described in Example 1, crystallized at 80°C for 100 hours to obtain the molar ratio of silicon to aluminum SiO 2 / Al 2 o 3 NaZSM-5 molecular sieve with a shape index of 500 and 3.

[0033] Weigh 20 g of the above SiO 2 / Al 2 o 3 500, NaZSM-5 molecular sieve with a shape index of 3, 20 grams of silica sol (SiO 2 40% by weight) and 14.8 grams of aluminum phosphate, mixed with water, extruded into strips with a diameter of 1.5 mm, dried, placed in an oven at 120 ° C for 8 hours, and roasted in a muffle furnace at 550 ° C for 8 hours. The template agent was removed, exchanged three times in 10% hydrochloric acid solution at 80°C, dried and calcined in a muffle furnace at 600°C for 4 hours to obtai...

Embodiment 3

[0036] Tetrapropylammonium hydroxide and ammonia water are used as templates, sodium aluminate is used as aluminum source, silica sol is used as silicon source, and raw materials are molar ratio SiO 2 / Al 2 o 3 =300;OH － / SiO 2 =0.08; R / SiO 2 =0.5;H 2 O / SiO 2 = 20, using the method described in Example 1, crystallized at 180°C for 40 hours to obtain the molar ratio of silicon to aluminum SiO 2 / Al 2 o 3 NaZSM-5 molecular sieve with a shape index of 300 and a shape index of 60.

[0037] Weigh 30 g of the above SiO 2 / Al 2 o 3 NaZSM-5 molecular sieve with a shape index of 300 and 60, 28 grams of silica sol (SiO 2 40% by weight) and 19 grams of alumina, mixed with water, extruded into a mold with a diameter of 2.0 mm, dried in the air, placed in an oven at 100 ° C for 10 hours, and roasted in a muffle furnace at 550 ° C for 6 hours. The template agent was removed, exchanged three times in 10% ammonium chloride solution at 85°C, dried and calcined in a muffle furnace ...

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Abstract

The invention relates to a catalyst for preparing propylene through C4 olefin cracking, and a preparation method thereof. The problems of low stability and low propylene selectivity of present catalysts for preparing propylene through present C4 olefin cracking are mainly solved. The catalyst comprises 20-90% of ZSM-5 molecular sieve with the shape index of 3-100 (the shape index is defined as a length ratio of a longest edge to a shortest edge of a molecular sieve crystal in a three dimensional direction), 0.05-3% of a transition metal oxide and 18-69% of a binder. The catalyst provided by the invention well solves the problems, and can be used in the industrial production for preparing propylene through C4 olefin cracking.

Description

technical field [0001] The invention relates to a catalyst for cracking carbon tetraolefins to produce propylene, its preparation method and application. Background technique [0002] Propylene is an important basic raw material in the petrochemical industry. Driven by the rapid growth of demand for polypropylene and its derivatives, the demand for propylene will continue to grow at a relatively rapid rate in the next few years. Therefore, propylene is considered to be a product with great market potential . Mixed carbon tetraolefins are by-products of FCC units in ethylene plants and refineries. Usually, they can only be used as low-value-added products such as liquefied gas fuels. They can be further processed into propylene and ethylene to make full use of this considerable amount of valuable olefin resources. , both economically and technically feasible. [0003] The active components of catalysts usually used for olefin cracking are molecular sieves such as hydrogen Z...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/48C07C11/06C07C4/06
CPCY02P20/52
Inventor 任丽萍滕加伟金文清何万仁
Owner CHINA PETROLEUM & CHEM CORP
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