| 摘要 |
1. A process for the preparation of a glyoxylic acid ester by oxydehydrogenation of the corresponding glycolic acid ester in the gas phase over a supported catalyst in a tubular reactor, wherein the catalyst support consists of at least one cylindrical monolith, the monolith essentially having the same diameter as the reactor tube and containing channels 1 to 10 mm in diameter which lead from the inlet to the outlet of the reactor tube, and wherein 60 to 90% of the volume of the monolith is formed by hollow spaces. |
