| abstract |
Production of formaldehyde by oxidizing dehydrogenation of methanol in the presence of a catalyst with a total layer thickness of 5 to 50 millimeters, which consists of 3 or more layers, part of the layers 5 to 45% by weight of the catalyst with silver crystals of grain size 0.2 to 1.75 millimeters, part of layers 1 to 35% by weight of the catalyst with titanium monoxide and / or quartz particles with a grain size of 0.1 to 2.5 mm and the remaining part of layers 20 to 94% by weight of the catalyst with particles from 99 to 99.9999% by weight of copper and / or silver and 0.0001 to 1% by weight of phosphorus, based on the weight of these particles on these elements, and the grain size 0.75 to 2.5 millimeters.n n n The formaldehyde which can be prepared by the process of the invention is a disinfectant, tanning agent, reducing agent and valuable starting material for the production of synthetic resins, adhesives and plastics. |