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Reaction method and reactor for preparing acrylic acid through selective oxidation of propane

A reactor, acrylic acid technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of decreased selectivity of acrylic acid, conversion of propylene into acrylic acid, large differences, etc., to reduce resource consumption and save Energy consumption, effect of highly selective conversion

Inactive Publication Date: 2013-09-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been proposed to use a double-layer catalyst (one layer is a catalyst for oxidative dehydrogenation of propane, and one layer is a catalyst for selective oxidation of propylene) to improve the selectivity of acrylic acid. Hydrogen to propylene and propylene oxidation to acrylic acid) require different alkoxy ratios in the gas, and the difference is very large, resulting in poor reaction effect
If the alkoxygen ratio is too high, the oxygen in the system is almost completely consumed in the inlet section catalyst (propane oxidative dehydrogenation to propylene), and the generated propylene cannot be converted into acrylic acid in the outlet section catalyst due to lack of oxygen; if the alkoxygen ratio is too low , the propylene produced on the catalyst in the inlet section will be further deeply oxidized, and the selectivity of acrylic acid in the entire reaction will decrease, failing to achieve the purpose of improving product selectivity by using a double-layer catalyst

Method used

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  • Reaction method and reactor for preparing acrylic acid through selective oxidation of propane
  • Reaction method and reactor for preparing acrylic acid through selective oxidation of propane
  • Reaction method and reactor for preparing acrylic acid through selective oxidation of propane

Examples

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Effect test

Embodiment 1

[0032] In a common fixed-bed reactor, catalyst 1 uses a nickel-zirconium oxide catalyst for the oxidative dehydrogenation of propane; catalyst 2 uses a molybdenum-vanadium oxide catalyst for the selective oxidation of propylene. The mass ratio of catalyst 1 and catalyst 2 is 2:3. Quartz sand with a mass ratio of 0.2 to 1:1 of the catalyst 1 is contained between the two layers of catalysts. The reaction temperature is 340° C., and the reaction pressure is normal pressure. In the feed gas, the molar ratio of propane to oxygen is 6.6:5.4, and does not contain distributed oxygen and water vapor.

Embodiment 2

[0034] In the cross-sectional oxygen distribution reactor of the present invention, the reaction conditions are the same as in Example 1, and the molar ratio of propane to oxygen is 6.6:5.4. Wherein, the molar ratio of mixed oxygen and distributed oxygen is 6:1.

[0035] The reaction result of the above process is shown in figure 2 , through the comparison of the above two processes, using the reactor of the present invention, the performance of the selective oxidation of propane to acrylic acid has been greatly improved, not only the conversion rate has increased slightly, from 18% to 22%, and the selectivity of acrylic acid is obvious Improve, from less than 10% to 45%. At the same time, the selectivity of the by-product carbon dioxide decreased by more than 10%.

Embodiment 3

[0037] In the cross-sectional oxygen distribution reactor of the present invention, the mass ratio of the filled catalyst 1 to the catalyst 2 is 2:3, and the two layers of catalysts contain quartz sand with a mass ratio of 0.2 to 1:1 to the catalyst 1. The reaction temperature is 340° C., and the reaction pressure is normal pressure. In the feed gas, the molar ratio of propane to oxygen is 6.6:5.4, and there is no water vapor. The effect of different mixed oxygen and distributed oxygen feed ratios on the reaction performance is shown in image 3 .

[0038] The ratio of mixed oxygen and distributed oxygen has a great influence on the reaction result, changing the molar ratio means changing the alkoxygen ratio of the two processes. Depend on image 3 It can be seen that the conversion of propane reaches the maximum when the molar ratio of distributed oxygen to mixed oxygen is 0.15, and the best yield of acrylic acid is achieved when the molar ratio of distributed oxygen to mi...

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Abstract

The invention relates to a reactor and a reaction process for preparing acrylic acid through selective oxidation of propane, which are characterized that the reactor comprises an oxygen distributor, so that oxygen in a raw material gas can enter the reactor. Thus, the problems of different requirements of two steps, namely a step of preparing propene through oxidative dehydrogenation of the propane and a step of preparing the acrylic acid through selective oxidation of the propene, of a process for preparing the acrylic acid through selective oxidation of the propane on the raw material oxygen can be solved; effective conversion from the propane to the acrylic acid is realized in the same reactor; and the economy of the process is improved.

Description

technical field [0001] The invention relates to the selective oxidation of propane to produce acrylic acid, in particular to a reaction process and reactor for the selective oxidation of propane to produce acrylic acid. Background technique [0002] Converting low-carbon alkanes into corresponding oxygenates has extremely important economic value, and has attracted more and more attention from researchers in recent years. Acrylic acid and its derivatives, acrylates, are important raw materials for industrial production, and are widely used in industries such as coatings, chemical fibers, textiles, and petroleum product development. There are many production process routes for acrylic acid and its esters, and the current industry is dominated by propylene oxidation. The cost of propylene is relatively high, and the use of cheap and readily available propane instead of propylene to directly oxidize acrylic acid has become a research hotspot in the development and utilization ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C57/05C07C51/25B01J8/02
Inventor 徐恒泳葛庆杰方雯俞佳枫
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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