| abstract |
The present invention relates to a process for the preparation of alkyl methacrylates, especially MMA, and methacrylic acid based on methacrolein, which is oxidatively esterified in a second process stage. Methacrolein is in principle obtainable here from C 2 and C 4 units. The process of the invention has the advantage here that the alkyl methacrylates and methacrylic acid can be obtained in a simple manner, in high yields and in high purity, optionally as a mixture or as separate product streams. Here, in particular, the process of the invention has the great advantage that in particular the ratio of the desired methacrylic acid and alkyl methacrylate (especially MMA) products can be freely adjusted within a wide range and can be Chemical engineering means and process parameters change. |