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Method of preparing propylene by butylene dismutation

A technology of butene and propylene, which is applied in the field of catalytic conversion of butene-1 and butene-2 ​​carbon four fractions to produce propylene, which can solve the problems of short catalyst regeneration period, ethylene consumption, and harsh raw material requirements, and achieve long catalyst Effect of activity cycle, high propylene yield, avoidance of hydrogen transfer reaction

Inactive Publication Date: 2008-02-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to overcome the problems of ethylene consumption, harsh raw material requirements, narrow application range and short catalyst regeneration cycle in previous literatures, and provide a new method for producing propylene by disproportionation of butene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Accurately weigh the required amount of ammonium metatungstate, add 200 ml of deionized water, and stir until completely dissolved. In addition, weigh the required amount of silica gel and put it into a 1000 ml round-bottomed flask, and bake the silica gel at 550°C for 3 hours in the air before use. Then pour the above-mentioned ammonium metatungstate solution into a round-bottomed flask filled with silica gel, evaporate the water in a rotary evaporator at 60°C, and then put it in an oven for drying overnight at 120°C. Put the above prepared sample in a muffle furnace and bake at 550°C for 4-12 hours to obtain WO 3 Catalyst in an amount of 6% by weight of the carrier.

[0023] Put 6 grams of the prepared tungsten oxide catalyst into a fixed-bed reactor with an inner diameter of 24 mm. Before the experiment, pass nitrogen to activate it at 550 ° C for 2 hours and then cool down to the reaction temperature. The raw materials used in the experiment are butene-2 ​​and bute...

Embodiment 2

[0025] WO prepared according to the steps of Example 1 3 Content is the catalyst of 0.9% of carrier weight, puts 6 grams of prepared tungsten oxide catalysts into the fixed-bed reactor that internal diameter is 24 millimeters, passes nitrogen before the experiment and cools down to reaction temperature after 2 hours of activation at 550 ℃, in the experiment The raw material used is that the molar ratio of butene-2 ​​to butene-1 is 4.37:1, the reaction temperature is 280°C, and the space velocity is 3 hours -1 , under the condition that the reaction pressure is 3.0MPa in terms of gauge pressure, the conversion rate of butene is 55%, and the yield of propylene is 17.53%.

Embodiment 3

[0027] WO prepared according to the steps of Example 1 3 Content is the catalyst of 3.0% of carrier weight, puts 6 grams of prepared tungsten oxide catalysts into the fixed-bed reactor that internal diameter is 24 millimeters, passes nitrogen before the experiment and cools down to reaction temperature after 2 hours of activation at 550 ℃, in the experiment The raw material used is that the molar ratio of butene-2 ​​to butene-1 is 4.05:1, the reaction temperature is 300°C, and the space velocity is 1.5 hours -1 , under the condition that the gauge pressure is 4.5MPa, the conversion rate of butene is 63%, and the yield of propylene is 23.12%.

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Abstract

The present invention relates to a method for producing propylene using butylene divergent mode. The method is to overcome the shortcoming in the prior technology that: the prior method needs ethylene; the requirement for the raw material is much higher; the adaptability is much narrower; the regeneration period for the catalyzer is much shorter. The method uses butylene as the raw material; under the condition that the reaction temperature is 250- 500 Celsius system, the reaction pressure calculated by a pressure meter is 0-5MPa and the reaction weight hollow speed is 0.1-1 hours, the raw material is contacted with the catalyzer to produce a flow including propylene; thereinto, the molar ratio between butylene-2 and butylene-1 in the raw material is 2.5-10: 1; the used catalyzer includes: (a) carrier of SiO2; and the technical scheme of 0.1-20 percent of tungsten oxide calculated by the carrier weight meter based on (b); thereinto, the surface area of the catalyzer carrier is 200-700m2 per gram; the method can solve the problem greatly, which can be uses in the industrial production of propylene.

Description

technical field [0001] The invention relates to a method for producing propylene by disproportionation of butene, in particular to a method for producing propylene by catalytic conversion of carbon four fractions rich in butene-1 and butene-2. Background technique [0002] Propylene is one of the important basic raw materials, mainly used in the production of chemical products such as polypropylene, acrylonitrile, and propylene oxide. Among them, polypropylene accounts for more than half of the world's propylene demand. In recent years, with the rapid growth of demand for derivatives such as polypropylene, the demand for propylene has been increasing year by year. On the other hand, with the continuous increase of my country's ethylene production and crude oil processing capacity, the amount of C4 and C4-rich olefin-rich hydrocarbons produced by ethylene plants and refineries has increased significantly. In my country where oil resources are relatively scarce, how to make ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/06C07C2/00C07C4/06B01J23/30B01J21/08
CPCY02P20/52Y02P20/584
Inventor 刘俊涛钟思青朱志炎王华文
Owner CHINA PETROLEUM & CHEM CORP
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