Abstract: The method for preparing carbonyl compounds according to the present invention comprises a vapor phase oxidizing dehydrogenation of C.sub.1 -C.sub.4 alcohols at a temperature ranging from 500.degree. to 700.degree. C. in the presence of a silver catalyst, wherein silver is supported on a carrier having a crystalline structure incorporating alumina and silica in the form of cristobalite.

Abstract: In catalytically oxidizing methanol in the vapor phase according to already-known processes for the production of formaldehyde, the hot formaldehyde-containing gaseous effluent of the catalytic converter is rapidly cooled by being passed through the tubes of a heat exchanger which are filled with balls composed of a solid which is substantially inert toward formaldehyde. As compared with a similar cooling system in which the tubes are empty or in which enhancement of heat transfer is attempted by using metal heat-transfer enhancement devices such as twisted metal ribbons, the present method affords reduced post-reaction decomposition of formaldehyde while at the same time allowing use of a relatively high temperature on the shell side of the heat exchanger whereby it becomes possible to raise steam at a pressure higher than that characteristic of the prior art.

Abstract: Methyl glyoxal is prepared by oxidation of propylene glycol-1,2 in the gaseous phase on a heterogeneous catalyst. The process is carried out with an excess of oxygen and the catalyst used contains molybdenum and at least one of the metals: vanadium, silver, copper, iron, tungsten, tin, zinc, alkali metals, alkaline earth metals.

Abstract: Formaldehyde manufacture by oxidative-dehydrogenation of methanol over a silver or copper catalyst. Aqueous formaldehyde solution is obtained from the reaction and is stripped of methanol and water by a low energy process at relatively low temperature by means of recycled inert gas in a stripping column comprising at least about 1.5 theoretical transfer units for stripping methanol.

Abstract: A process for converting methanol to formaldehyde wherein methanol along with a stream containing air, water, methanol and formaldehyde is fed to a primary reactor 5 containing a silver catalyst maintained at from 630.degree. to 650.degree. C. The effluent from the primary reactor 5 is cooled and fed along with a stream containing air, water, methanol and formaldehyde to a secondary reactor 9 containing a metal oxide catalyst, such as iron oxide-molybdenum oxide. The secondary reactor 9 is maintained at from 325.degree. to 400.degree. C. The product from the secondary reactor is fed to an absorber 11 which is cross connected top and bottom with a stripper 13. Water is fed to the absorber to absorb formaldehyde and the product solution of formaldehyde and water is removed from the absorber. Air is fed to the stripper and the effluent from the stripper which contains air, water, methanol and formaldehyde is fed to both the primary reactor 5 and the secondary reactor 9.

Abstract: A process for preparing a granular, supported silver catalyst by: contacting refractory porous granules having a tap volume of about 1 to 2 grams per cubic centimeter with water or a water soluble liquid having a boiling point of less than about 105.degree. C. so as to wet said granules and to absorb water or said soluble liquid within peripheral pores of said granules; contacting the wet granules with an ammoniated solution containing a silver salt which decomposes on calcination at a temperature below about 600.degree. C. and a fatty acid having from about 12 to 22 carbon atoms, the quantity of silver salt in said solution being sufficient to provide a metallic silver deposit onto said granules of from about 1 to 10% by weight of said dry granules; drying the silver solution on the granules, and heating the dried granules at a temperature sufficient to decompose the dried silver compounds to metallic silver.

Abstract: This invention relates to the production of formaldehyde and to catalysts which may be used therefore. In more detail the invention relates to a process for the production of formaldehyde from methanol includes the passage, at an elevated temperature, of a gas stream containing methanol and oxygen through a catalyst, the catalyst comprising a monolithic support provided with channels for passage therethrough of the gas stream and with the channel wall surfaces coated or impregnated with one or more elements selected from the group consisting of copper, silver, gold and iron.

Abstract: Methylglyoxal is manufactured continuously by passing glycerol in the gaseous phase over a heterogeneous dehydrogenation catalyst.

Abstract: The process for preparing glyoxal from ethylene glycol wherein a gaseous mixture of ethylene glycol, oxygen, and inert diluent gas is reacted in the presence of a catalyst containing as essential ingredients phosphorous with copper, with silver, or with both copper and silver, to form glyoxal, is improved by incorporating in said gaseous mixture a vapor of a bromine compound.

Abstract: This invention relates to a process for the catalytic conversion of methanol to formaldehyde by oxidation/dehydrogenation over a silver-gold alloy catalyst.

Abstract: This invention relates to the production of formaldehyde and to catalysts therefor.In particular the inventor relates to a process for the production of formaldehyde from methanol including the passage, at an elevated temperature, of a gas stream containing methanol and oxygen through a catalyst, the catalyst comprising a monolithic support provided with channels for passage therethrough of the gas stream and with the channel wall surfaces coated or impregnated with one or more elements selected from the group consisting of copper, silver, gold and iron.