Abstract:
There is provided a process for the production of ketones and a catalyst for increasing the proportion of ketone produced by the process, wherein an olefine, molecular oxygen and steam are passed over a catalyst containing discrete particles of tin oxide, a majority of such particles being of a size of at most 50 A, homogeneously distributed over a particulate supporting material, the tin oxide particles being covered by a substantially monomolecular layer of molybdenum oxide.
Abstract:
Insoluble enzyme complexes are prepared by chemically bonding enzymes to natural sponge. The enzyme can be either directly bonded to the sponge, or the sponge can be first modified with an appropriate chemical reagent, such as a cyclic dicarboxylic acid anhydride, prior to chemical bonding with the enzyme.
Abstract:
Polyfunctional Lewis bases such as N,N,N'',N''-tetramethyl-1,2diaminoethane are used to lower the viscosity of a solution of a living polymer, especially during the preparation of a living polymer using a polyfunctional anionic initiator according to the process disclosed. Homopolymers and copolymers may be produced; the process is particularly suited for the preparation of A-B-A block copolymers the Lewis base being added after at least 50 percent of the first-formed polymer block is completed.
Abstract:
A process is disclosed for the preparation of lysine and lysine compounds wherein a mixture of 5-(3-cyanopropyl)-hydantoin and 1ureido-4-cyanovaleramide is obtained and hydrogenated in the presence of a catalyst to a mixture of 5-(4-aminobutyl)-hydantoin and 1-ureido-5-aminocapronamide, which in turn is hydrolyzed to lysine or a lysine compound.
Abstract:
A process for the preparation of polyamides in granular or powdered form is described, said process comprising heating a lactam or mixture of lactams in a suitable inert solvent at a temperature below the melting point of the polyamide to be formed, in the presence of a conventional anionic catalyst and a conventional promotor. The disclosure points out that the presence during polymerisation of one or more compounds from the group of alcohols, carboxylic esters and inert salts, dissolved or dispersed in the solvent, prevents the formation of lumps and the adhesion of the polyamide to the reactor walls.
Abstract:
Low pressure polymerization of a vinyl halide with 4-methyl pentene-1 is disclosed. The reaction is conducted in an oxygenfree atmosphere at a pressure not in excess of 150 atmospheres absolute at a temperature of from -5* to +80* C., optionally in the presence of a polymerization initiator. The resulting product is transparent, colorless, thermostable and has a melt index of not more than 100.
Abstract:
A process for stabilizing conventional particulate thermoplastic organic polymers by admixing conventional stabilizers for the polymers is disclosed, wherein the resulting polymer-stabilizing mixture is homogeneous and exhibits good polymer stability. The stabilizer has a melting point at least 1* C less than the temperature at which the polymer agglomerates and/or sinters and/or decomposes. The stabilizer is in the non-liquid state and preferably has a viscosity of at least 50 poise, measured under the conditions at which the stabilizer is added to the polymer. The polymer is heated to a temperature above the melting point of the stabilizer, and lower than the agglomeration and/or decomposition and/or sintering temperature of the polymer. The stabilizer is admixed with the polymer while the polymer is maintained at about the aforesaid temperature, and while the stabilizer is at a temperature at least about 1* C lower than the stabilizer melting point temperature. The mixing is preferably at a shear rate no greater than 1000 sec 1. The resulting polymers may be used in conventional applications for such polymers, and will exhibit improved stability against heat, light and/or oxygen.
Abstract:
An improved process for the thermal decomposition of dicyclopentadiene and methyl-substituted dicyclopentadienes into cyclopentadienes and methyl-cyclopentadienes is described, wherein the conversion is carried out at particularly high yields and in the substantial absence of reactor-fouling problems by maintaining the molecular oxygen content in the gaseous reaction mixture below about 10 parts per million and also maintaining reactor conditions at a partial dicyclopentadiene pressure below the vapor pressure of the dicyclopentadiene under conversion at the prevailing temperature employed in the process.
Abstract:
A process for producing an enzyme preparation capable of coagulating milk by cultivating a fungi of the group Mucor lamprosporus or a natural or synthetic variant or mutant thereof in a culture medium containing a sufficiency of available carbon, nitrogen and trace nutrients at a temperature of between 15* and 45*C, with the incubation under aerobic conditions for a period of between 2 and 12 days. The enzyme preparation is then recovered from the medium, for example, by extraction with water or in the dissolved state by filtration and dialysis. The enzyme preparations obtained have a high milk-coagulation activity with low proteolytic and lipolytic activity.
Abstract:
A PROCESS AND APPARATUS IS DESCRIBED TO MINIMIZE THE DANGER OF AERIAL EXPOLSIONS WHICH OCCUR DURING THE HIGH PRESSURE, HIGH TEMPERATURE POLYMERIZATION OF ETHYLENIC MONOMERS. THE PROCESS INVOLVES RAPIDLY DISCHARGING AT LEAST 0.3 KG. OF WATER PER KG. OF REACTOR CONTENTS INTO THE SAFETY PASSAGEWAY AND OUTLET PIPE WITHIN 10 SECONDS FOLLOWING THE OPERATIVENESS OF SUCH SAFETY PASSAGEWAY BY THE OPENING OF VALVE MEANS WHEN AN EXCESSIVE PRESSURE LEVEL IS REACHED WITHIN THE REACTOR. VARIOUS APPARATUS STRUCTURES ARE ALSO DISCLOSED ADAPTED FOR PRACTICING THIS PROCESS WHEREIN THE WATER IS HELD IN RUPTURABLE BAGS OR, E.G., IS DISCHARGED INTO THE ESCAPING GAS STREAM THROUGH VALVE-OPERATED SPRAY MEANS, OR IN OTHER WAYS.