Abstract: A process for producing a silver-based epoxidation catalyst, comprising i) impregnating a particulate porous refractory support with a first aqueous silver impregnation solution comprising silver ions and an aminic complexing agent selected from amines, alkanolamines and amino acids; ii) converting at least part of the silver ions impregnated on the refractory support to metallic silver by heating while directing a stream of a first gas over the impregnated refractory support to obtain an intermediate catalyst, wherein the first gas comprises at least 5 vol.

Abstract: A method for preparing a silver impregnation solution comprises (a) charging a neutralization reactor R1 with an aqueous organic amine; (b) adding oxalic acid powder through a first feeding conduit to the neutralization reactor R1 to obtain an aqueous oxalic acid-organic amine solution; (c) directing the aqueous oxalic acid-organic amine solution from the neutralization reactor to a complexation reactor R2; (d) adding particulate silver oxide through a second feeding conduit to the complexation reactor R2 to obtain a silver impregnation solution; and, optionally, (e) subjecting the silver impregnation solution to filtration. The silver impregnation solution is used for producing a catalyst effective in the oxidative conversion of ethylene to ethylene oxide. The method allows for the preparation of a silver impregnation solution in an efficient and occupationally and environmentally safe way.

Abstract: The present invention relates to a process comprising at least the steps (A) chemical reaction of at least one organic compound in the presence of at least one heterogeneous catalyst in a reaction mixture and (B) removal of the at least one heterogeneous catalyst by means of a magnetic filter, and also the use of a magnetic filter for separating off catalyst particles in a process for the hydrogenation of at least one organic compound.

Abstract: The present invention relates to a process comprising at least the steps (A) chemical reaction of at least one organic compound in the presence of at least one heterogeneous catalyst in a reaction mixture and (B) removal of the at least one heterogeneous catalyst by means of a magnetic filter, and also the use of a magnetic filter for separating off catalyst particles in a process for the hydrogenation of at least one organic compound.

Abstract: The calculation of the above balance shows that the division of stream (5) into the streams (5a) and (5b) used here leads to the fact that in the neutralization stage no excess sodium formate is produced, so that any ejection can be omitted. Furthermore, the water content of the stream (14) comprising sodium formate recirculated to the first crystallization stage in this case can be set to a very low value.

Abstract: The invention relates to a method for producing a solid sodium diformate preparation having a minimum formic acid concentration of 35 percent by weight relative to the total weight of the sodium diformate preparation. According to said method, an aqueous solution having a molar ratio HCOOH:HCOONa of more than 1.5:1 and a molar ratio HCOOH:H2O of at least 1.1:1 is produced from sodium formate and at least 74 percent by weight of formic acid at an elevated temperature, the aqueous solution is crystallized, and the solid phase is separated from the mother liquor.