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Method for preparing acrylic acid

一种丙烯酸、丙烯的技术，应用在羧酸盐制备、有机化合物的制备、碳基化合物制备等方向，能够解决没有公开丙烯醛等问题

Active Publication Date: 2020-10-09
ROHM & HAAS CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the prior art does not disclose a process for the production of acrolein via gas-phase oxidation by supplying the reaction gas according to the present invention, which allows the use of high-grade propylene in the reactor feed gas for the chemical-grade propylene existing equipment without sacrificing productivity or requiring other capital improvements

Method used

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  • Method for preparing acrylic acid
  • Method for preparing acrylic acid

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Experimental program
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preparation example Construction

[0013] The production of acrylic acid further comprises contacting the acrolein mixture obtained by the method of the present invention described above with a mixture of oxidation catalysts (the first mixed metal oxide catalyst and the second mixed metal oxide catalyst described above) to produce a mixture containing acrylic acid. Suitable second mixed metal oxide catalysts are known in the art, for example, as described in U.S. Patent No. 4,892,856 and U.S. Patent No. 6,762,148, and include, for example, one of molybdenum, vanadium, tungsten, copper, and antimony or more. In certain embodiments, the second mixed metal oxide catalyst comprises primary and minor components. In certain embodiments, the primary component includes one or more of molybdenum and vanadium. In certain embodiments, the secondary component includes one or more of tungsten, copper, and antimony.

[0014] In certain embodiments, the inventive method step of contacting a reactant gas to form a mixture c...

example 1

[0018] Characterization of Thermal Oxidation Constraints in Exemplary and Comparative Processes

[0019] As shown in Table 1, a conventional two-stage single-pass acrylic acid process operates at typical conditions based on chemical grade propylene ("CGP"), polymer grade propylene ("PGP") and PGP with supplemental fuel.

[0020] Table 1. Thermal Oxidation Constraints in Exemplary and Comparative Processes

[0021]

[0022] + "AOG" means absorber off-gas

[0023] The results show that the process is limited by the energy input to the thermal oxidizer. Operating under the above conditions produces a vapor waste stream containing 30% to 40% of the energy input to the thermal oxidizer. As the purity of the propylene feed increases, the energy content of the vapor waste stream decreases. In the extreme case where the propylene content of the polymer grade propylene feed is at least 99.5%, the energy content in the vapor waste stream is 50% of that in the case of CGP. Witho...

example 2

[0026] Characterization of flammability constraints during exemplary and comparative procedures

[0027] One hazard inherent in propylene oxidation is the management of hazards related to the flammability of propylene. This hazard can be controlled by operating with the reactor feed composition outside the flammable zone within some safe margin. The distance between the operating point and the flammable area is defined as approaching the flammable limit. Certain safety margins exist to cover errors in flammability boundary correlations, errors in reactor feed composition determination, and to prevent reactor trips associated with reactor feed flow perturbations. The reactor feed is controlled so that the feed composition moves above the upper flammability limit without passing through the flammable region. When the feed composition exceeds the flammability limit, increasing the fuel content tends to increase the oxygen required to produce a flammable mixture (more fuel incre...

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Abstract

Provided is a process for preparing acrylic acid comprising (1) preparing acrolein by catalytic gas phase oxidation comprising (a) providing a reaction gas comprising (i) 5 to 10 mol % propylene, (ii)0.02 to 0.75 mol % propane, and (iii) 0.25 to 1.9 mol % of a fuel mixture comprising at least one of methane and ethane, wherein the molar ratio of the total amount of propane, methane, and ethane tothe total amount of propylene is from 0.01:1 to 0.25:1, (b) contacting the reaction gas with a first mixed metal oxide catalyst to form a mixture comprising acrolein, wherein the first mixed metal oxide catalyst comprises one or more of molybdenum, bismuth, cobalt, and iron, and (2) contacting the acrolein mixture with a second mixed metal oxide catalyst to form a mixture comprising acrylic acid,wherein the second mixed metal oxide catalyst comprises one or more of molybdenum, vanadium, tungsten, copper, and antimony.

Description

technical field [0001] The present invention generally relates to a process for the preparation of acrylic acid by catalytic gas phase oxidation. The method includes providing a reaction gas of a fuel mixture containing propylene, propane, and at least one of methane and ethane, and contacting it with a first oxidation catalyst to form an acrolein-containing mixture, and contacting the acrolein mixture with a second oxidation catalyst. The carbon dioxide catalyst is contacted to form an acrylic acid-containing mixture. Background technique [0002] Acrylic acid can be produced commercially by the selective oxidation of acrolein, which can be produced by the selective oxidation of propylene. Commercially available propylene can be classified into different grades based on the levels of other impurities, such as refinery grade, chemical grade, and polymer grade. Depending on the price difference, there may be advantages to using one grade over another. Although different gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/35C07C47/22C07C51/25C07C57/04
CPCC07C45/35C07C51/252C07C57/04C07C47/22
Inventor D·A·埃伯特T·A·黑尔B·R·凯斯J·罗斯徐金锁
Owner ROHM & HAAS CO
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