Process for the preparation of methyl methacrylate
A technology of methyl methacrylate and methacrolein, which is applied in the field of preparation of methyl methacrylate, can solve the problems of lower production rate, and achieve the effects of low capital expenditure, increased waste and high production rate
Active Publication Date: 2017-12-12
ROHM G M B H
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Problems solved by technology
However, this process produces large quantities of water which, according to the teaching of EP 0 890 569, make a process of this type without complex purification a prior stage for the oxidative esterification of methacrolein to methyl methacrylate not suitable
However, in addition to said high water content, the starting materials and by-products used in this process, such as dimethacrolein, also potentially produce reduced yields or adverse effects in the oxidative esterification
Method used
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Abstract
The present invention relates to a process for the preparation of methyl methacrylate comprising the steps of A) preparing methacrolein, and B) reacting the methacrolein obtained in step A) in an oxidative esterification reaction to obtains methyl methacrylate, characterized in that the two steps A) and B) are carried out in the liquid phase at a pressure of 2 to 100 bar, and step B) is carried out in the presence of a heterogeneous catalyst containing noble metals , the catalyst comprises a metal and / or comprises a metal oxide.
Description
Process for the preparation of methyl methacrylate technical field The present invention relates to a process for the preparation of methyl methacrylate by direct oxidative esterification of methacrolein and the preparation of methacrolein. Background technique Large quantities of methyl methacrylate are used in the preparation of polymers and copolymers with other polymerizable compounds. Furthermore, methyl methacrylate is an important building block for various special esters based on methacrylic acid (MAA), which are prepared by transesterification with the corresponding alcohols. There is therefore great interest in the simplest possible, cost-effective and environmentally friendly production methods of this starting material. Currently, methyl methacrylate (MMA) is mainly prepared from hydrocyanic acid and acetone via the obtained acetone cyanohydrin (ACH) as the main intermediate. The disadvantage of this method is that very large quantities of ammonium sulfate ...
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IPC IPC(8): C07C67/44C07C69/54C07C67/39
CPCC07C45/75C07C67/39C07C69/54C07C47/22C07C67/44
Inventor S·科里尔T·巴尔杜夫M·科斯特内尔M·格罗姆平A·莱金R·布格哈特
Owner ROHM G M B H