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Optimized method for producing methacrolein

A technology for methacrolein and formaldehyde, applied in chemical instruments and methods, carboxylate preparation, carboxylate preparation, etc., can solve the problems of expensive, inconvenient, colored secondary products, etc.

Active Publication Date: 2017-05-17
ROHM G M B H
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, especially for the oxidative esterification of the MAL to MMA, a low DIMAL content is desirable, since DIMAL or its secondary products must also be removed from the product in this process, which is costly and undesirable. convenient, or they interfere in a significant way with the reaction
Additionally, the DIMAL content in the workup causes the secondary product to be colored

Method used

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Embodiment

[0045] The method according to the invention and the advantages resulting therefrom are further described below with reference to these examples, which however should not be construed as limiting the invention in any way.

[0046] Examples 1 to 9 / Comparative Examples 1 to 11 (see Table 1).

[0047] Depending on the example, a formalin solution with a formaldehyde content of 37% by weight or 55% by weight was mixed with propionaldehyde by means of a static mixer (hereinafter referred to as aldehyde solution) and mixed in an oil-heated heat exchanger. The mixture was then heated to the desired temperature (see Table 1). Depending on the example, the exact water content of the formalin plays no further role, since according to Table 1 it is fully incorporated into the water content of the fresh feed. The recycle stream from the bottom of the product column connected after the tubular reactor was mixed with acetic acid and dimethylamine (as a 40% solution in water) and likewise p...

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Abstract

The invention relates to an optimized method for producing methacrolein. Methacrolein is used in chemical synthesis, in particular as an intermediate product for producing methacrylic acid, methylmethacrylate or also active substances, odorous substances or flavourings. The invention also relates to the optimization of process parameters, as a result of which, the content of harmful dimer methacrolien in the end product can be reduced.

Description

technical field [0001] The present invention relates to an optimized process for the preparation of methacrolein. Methacrolein is used in chemical synthesis in particular as an intermediate for the preparation of methacrylic acid, methyl methacrylate or also active substances, fragrances or flavours. In particular, the invention relates to the optimization of process parameters by which, inter alia, a reduction in the harmful content of dimethylmethacrolein in the end product can be achieved. [0002] There is great interest in a very simple, economical and environmentally friendly preparation of methacrolein. Background technique [0003] in the so-called C 2 Methods In the preparation of methacrolein, the target product is obtained from formalin and propionaldehyde in the presence of a secondary amine and an acid, usually an organic acid. In this case, the reaction is carried out by a Mannich reaction. The methacrolein (MAL) synthesized in this way can then be converte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/75C07C47/22C07C57/055C07C51/16
CPCC07C45/75C07C51/16C07C47/22C07C57/04Y02P20/582C07C67/39C07C51/252C07C69/54B01J19/1812B01J2219/00051B01J2219/00162B01J2219/00166
Inventor R·布格哈特S·克里尔T·巴尔多夫G·克尔布尔M·克斯特纳E·伦戴尔
Owner ROHM G M B H
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