摘要:
A process is provided, in particular a continuous process for the carbonylation of butadiene by reacting the butadiene with carbon monoxide and a hydroxyl group-containing compound in the presence of a palladium catalyst system in a reaction zone to form a reaction mixture, said catalyst system comprising (a) a source of palladium cations, (b) a mono-, bi- or multidentate phosphine ligand, containing at least one phosphorus atom which is directly bound to two or three aliphatic carbon atoms, as process ligand to produce a palladium-phosphine ligand complex catalyst, and (c) a source of anions, said process ligand (b) containing the moiety shown in formula (I), wherein A1 and A2 each represent an aliphatic carbon atom which can be connected to one or more aliphatic or aromatic carbon atoms or both A1 and A2 are part of an at least 5-membered ring including the phosphorus atom, and X represents an aliphatic or aromatic carbon atom which can be connected to one or more aliphatic or aromatic carbon atoms or X is part of an organic bridging group connecting another identically or differently substituted phosphorus atom, and said source of anions (c) containing a carboxylic acid and, optionally, halide ions, wherein said process ligand is fed continuously or periodically to the process as ligand make-up at a temperature 50° C. or lower.
摘要:
The invention provides a process of producing steels containing nickel, particularly corrosion-resistant steels, which involves refining the metal bath obtained from the smelting of a ferro-nickel by adding to said metal bath in a refining converter ferro-nickel shot while concurrently contacting the metal bath with an oxygen-containing gas, e.g., a mixture of oxygen and argon, the addition of the ferro-nickel shot being carried out while controlling the flow rate of the shot in such a way that the temperature of the converter is maintained at a pre-selected level and the contacting of the oxygen-containing gas with the bath being carried out until the carbon content of the bath is reduced to a low level, e.g., about 0.04%. The inventive process permits the initial carbon and silicon levels of the metal bath to exceed 1% and 0.4%, respectively. The invention also permits the ferro-nickel shot to be added as highly refined ferro-nickel shot or as slightly refined ferro-nickel shot, or it may be added in two phases, the first utilizing slightly refined ferro-nickel shot and the second utilizing highly refined ferro-nickel shot, or both the slightly refined and highly refined ferro-nickel shot may be simultaneously added.
摘要:
The present invention relates to a process for decomposing cyclohexylhydroperoxide into cyclohexanone, said process comprising mixing an organic feed solution comprising cyclohexylhydroperoxide with an aqueous base solution in the absence of a transition metal catalyst resulting in a mixture comprising (i) an aqueous phase and (ii) an organic phase comprising cyclohexanone and cyclohexanol.
摘要:
The present invention relates to a process for decomposing cyclohexylhydroperoxide into cyclohexanone, said process comprising mixing an organic feed solution comprising cyclohexylhydroperoxide with an aqueous base solution in the absence of a transition metal catalyst resulting in a mixture comprising (i) an aqueous phase and (ii) an organic phase comprising cyclohexanone and cyclohexanol.
摘要:
A continuous hydroformylation process for forming an aldehyde comprising 1) reacting an olefinically unsaturated compound containing from 2 to 30 carbon atoms with carbon monoxide and hydrogen in the presence of a rhodium-bisphosphite ligand complex catalyst and 2) distilling a mixture comprising at least a part of the catalyst of 1), wherein the distilling is performed in the substantial absence of molecular hydrogen.
摘要:
A process is provided, in particular a continuous process for the carbonylation of butadiene by reacting the butadiene with carbon monoxide and a hydroxyl group-containing compound in the presence of a palladium catalyst system in a reaction zone to form a reaction mixture, said catalyst system comprising (a) a source of palladium cations, (b) a mono-, bi- or multidentate phosphine ligand, containing at least one phosphorus atom which is directly bound to two or three aliphatic carbon atoms, as process ligand to produce a palladium-phosphine ligand complex catalyst, and (c) a source of anions, said process ligand (b) containing the moiety shown in formula (I), wherein A1 and A2 each represent an aliphatic carbon atom which can be connected to one or more aliphatic or aromatic carbon atoms or both A1 and A2 are part of an at least 5-membered ring including the phosphorus atom, and X represents an aliphatic or aromatic carbon atom which can be connected to one or more aliphatic or aromatic carbon atoms or X is part of an organic bridging group connecting another identically or differently substituted phosphorus atom, and said source of anions (c) containing a carboxylic acid and, optionally, halide ions, wherein said process ligand is fed continuously or periodically to the process as ligand make-up at a temperature 50° C. or lower.
摘要:
A continuous hydroformylation process for producing an aldehyde comprising 1) reacting an olefinically unsaturated compound, carbon monoxide and hydrogen in the presence of a rhodium-organobisphosphite complex catalyst at a partial pressure of carbon monoxide and hydrogen, and 2) exposing a mixture comprising at least a portion of the catalyst of 1) to a gaseous mixture comprising hydrogen at a pressure that is greater than the partial pressure of carbon monoxide and hydrogen during the reaction.
摘要:
Process to separate linear 5-formylvaleric acid from a mixture of 5- and 3- and 4-formylvaleric acids, wherein the separation is performed by fractional extraction with two immiscible solvents of which one solvent is an aqueous solvent and the other solvent is an organic solvent, in which the organic solvent has a higher or lower affinity for 5-formylvaleric acid than its affinity for the 3-formylvaleric acids and for the 4-formylvaleric acid. Furthermore the invention relates to an improved process to prepare ∈-caprolactam starting from a mixture of branched and linear formylvaleric acids or starting from pentenoic acid.
摘要:
Catalyst system comprising a palladium compound, an acid compound having a pKa>2 measured in water of 18° C. and an non-symmetrical bidentate phosphorous ligand according to: in which the —PR1R2 group is different from the —PR3R4 group and in which X is a divalent organic bridging group, in which the shortest direct link between the two phosphorous atoms in the bridging group X consists of a chain of 2-10 carbon atoms and optionally a sulphur or oxygen atom.
摘要:
The invention relates to a system for detecting the defects of a wall used for enclosing a space where—generally liquid—materials are stored, with a coating on its internal side, especially a container wall, or/and the defects in the coating. In numerous fields of life all types of different materials, such as chemicals, solvents, petroleum oil and petroleum fractions, etc. need to be stored in a way excluding the possibility of these materials getting into the environment or other materials from the environment intermixing with the stored materials. In most cases such materials are stored in containers made of different materials, mostly metal, the walls of which holes may appear either as a result of corrosion or other damage, and through the appearing holes materials can flow either from outside into the container or from inside the container into the environment, and so the stored material may become unsuitable for use or serious environmental pollution may occur. In the interest of damage prevention different monitoring systems are used to detect holes appearing in container walls as soon as possible.