Abstract:
The invention relates to a walking beam furnace, the hearth of which consists, at least partially, of longitudinal beams arranged side by side and alternately formed as fixed beams and walking beams. Each walking beam is lifted and lowered with the aid of lifting rollers, which run on ramps. The ramps are prolonged downwards by a longer distance than is required for the working lift of the walking beams. The walking beams are depressed, step by step, into a repair and maintenance plane which lies appreciably below the plane of the hearth, by moving down the lifting rollers into the region of the lower prolongation of the ramps. For this purpose, a lifting rod which connects all the lifting rollers belonging to a walking beam, is connected to an associated actuating cylinder via a pivotally movable perforated arm mounted at a fixed point, the lifting rod being extended piece by piece by means of extension sections and with the aid of a holding device, and being in each case reinserted into a lower hole in the perforated arm.
Abstract:
In a process for preparing methyl-nonyl-acetaldehyde from undecanal and formaldehyde or a source of formaldehyde, e.g., a substance which forms formaldehyde, in the presence of catalytic amounts of a secondary amine, the improvement whereinA. the undecanal is used in the form of the reaction mixture obtained by hydroformylation of 1-decene, andB. di-n-butylamine is used as the catalyst,C. the molar ratio of catalyst to undecanal is 0.025 to 0.050 to 1,D. the reaction is carried out at 90.degree. to 100.degree. C., andE. the 2-methylene-undecanal formed is then converted by partial hydrogenation into methyl-nonyl-acetaldehyde.
Abstract:
A catalytic process for preparing aliphatic straight-chain and β-alkyl-branched carboxylic acids of 5 to 13 carbon atoms by catalytic oxidation of the corresponding aldehydes by means of oxygen or oxygen-containing gas mixtures in the liquid phase in the presence of a catalyst system contains alkali metal carboxylates or alkaline earth metal carboxylates or a mixture thereof in an amount, calculated as alkali metal or alkaline earth metal, of 0.5 mmol to 15 mmol per mol of aldehyde used and also metals of groups 4 to 12 of the Periodic Table of the Elements, cerium or lanthanum in amounts of not more than 5 ppm, based on the aldehyde used, or compounds of such metals, with the catalyst system being the reaction product from an aldehyde oxidation reaction.
Abstract:
The novel chemical compound, 3(4),7(8)-dihydroxymethylbicyclo[4.3.0]nonane and a process for its preparation, wherein bicyclo[4.3.0]nona-3,7-diene is reacted with synthesis gas in homogeneous organic phase in the presence of transition metal compounds of Group VIII of the Periodic Table containing complex-bound organophosphorus compound, at 70 to 160° C. and pressures of 5 to 35 MPa, and the 3(4),7(8)-bisformylbicyclo[4.3.0]nonane thus obtained is hydrogenated.
Abstract:
A process for preparing 3(4),8(9)-dihydroxymethyltricyclo[5.2.1.02,6]decane by hydroformylating dicyclopentadiene with subsequent distillation wherein the hydroformylation of dicyclopentadiene is carried out in two stages, and, in a first hydroformylation stage, the reaction is effected in a heterogeneous reaction system using an aqueous solution of transition metal compounds, containing water-soluble organic phosphorus (III) compounds in complex-bound form, of group VIII of the Periodic Table to give 8(9)-formyltricyclo[5.2.1.02,6]dec-3-ene, and, in a second hydroformylation stage, the thus obtained 8(9)-formyltricyclo[5.2.1.02,6]dec-3-ene is converted, in homogeneous organic phase in the presence of transition metal compounds of group VIII of the Periodic Table of the Elements to 3(4),8(9)-bisformyltricyclo[5.2.1.02,6]decane.
Abstract:
A process for preparing 3(4),8(9)-bis(aminomethyl)tricycle-[5.2.1.02,6]decane by hydroformylating dicyclopentadiene with subsequent reductive amination wherein the hydroformylation of dicyclopentadiene is carried out in two stages, and, in a first hydroformylation stage, the reaction is effected in a heterogeneous reaction system using an aqueous solution of transition metal compounds, containing water-soluble organic phosphorus (III) compounds in complex-bound form, of group VIII of the Periodic Table to give 8(9)-formyltricyclo[5.2.1.02,6]dec-3-ene, and, in a second hydroformylation stage, the thus obtained 8(9)-formyltricyclo[5.2.1.02,6]dec-3-ene is converted, in a homogeneous organic phase in the presence of transition metal compounds of group VIII of the Periodic Table of the Elements to 3(4),8(9)-bisformyltricyclo[5.2.1.02,6]decane
Abstract:
The invention relates to a non-catalysed method for the synthesis of straight-chain aliphatic carboxylic acids by oxidation of straight-chain aldehydes with oxygen-containing gas mixtures. The invention is characterised in that during the novel process of oxidation branched aldehydes are present in the reaction mixture.
Abstract:
The present invention relates to a process for preparing ester plasticizers from ethylene glycol or the dimers, trimers or tetramers of this compound and linear or branched aliphatic monocarboxylic acids having from 3 to 20 carbon atoms. The reaction is carried out in the presence of organic substances having a boiling point of
Abstract:
.alpha.-alkyl aldehydes having 8 to 17 carbon atoms are obtained from terminal olefins containing one less carbon atom. The olefins are first isomerized in the presence of iron carbonyl and then, without separating out the iron compound, hydroformylated in the presence of rhodium as catalyst.
Abstract:
A process for recovering rhodium from an aqueous solution containing its complex compounds and optionally complex ligands in the presence of a water-soluble salt of a carboxylic acid by treatment of the aqueous solution at 20.degree. to 120.degree. C. with hydrogen peroxide (or a substance forming hydrogen peroxide) and with oxygen (or an oxygen-containing gas). The rhodium is then removed as a water-insoluble compound.