Abstract:
A polymerization process is provided comprising contacting under polymerization conditions a catalyst, a taming agent, ethylene and optionally a comonomer, wherein the catalyst comprises chromium oxide, titanium oxide and an inorganic refractory oxide, wherein the taming agent is selected from the group consisting of water, alcohols, aldehydes, ketones, esters, and organic acids and mixtures thereof. The process is especially suited for polymerizing ethylene resins suitable for blow molding use.
Abstract:
A process for producing a metallic protective layer whereby a metal-containing plating, cladding, paint or other coating is applied to at least a portion of a reactor system and then contacted with a gaseous stream containing hydrocarbons, such as impure hydrogen, thereby producing a continuous and adherent metallic protective layer. The gaseous stream preferably comprises hydrogen, which may be recycled. A preferred embodiment of the invention is directed to touch-up procedures where a portion of an already protected reactor system is replaced or rewelded and the protective layer is formed as the replaced portion is brought onstream.
Abstract:
A high temperature treatment process is disclosed for increasing conversion and reducing the fouling rate of reforming catalysts. The process comprises reducing the catalyst in a reducing gas atmosphere at a temperature below 1025 DEG F and then treating the reduced catalyst at a temperature of from 1025 DEG F to 1275 DEG F in an inert gas atmosphere.
Abstract:
Mannich condensation products prepared by the condensation of a compound of formula (XIV), wherein R1 is hydrogen, hydroxy, lower alkyl or lower alkoxy; R3 and R4 are independently hydrogen or lower alkyl; R5 is hydrogen, alkyl, phenyl, aralkyl, alkaryl, or an acyl group of formulae (a) or (b) wherein R6 is alkyl, phenyl, aralkyl or alkaryl; R7 is alkyl; u is an integer from 1 to 10; n is an integer from 5 to 100; and x is an integer from 0 to 10; with an aldehyde and a nitrogen base selected from ammonia, lower alkylamine, a polyamine and mixtures thereof. The Mannich condensation products and their fuel soluble salts are useful as fuel additives for the prevention and control of engine deposits.
Abstract:
Disclosed is a composition comprising a layer carrying an organic oxygen scavenging material and a polymeric selective barrier layer. The polymeric selective barrier layer permits oxygen to migrate from the packaged volume to the organic oxygen scavenging material, and the polymeric selective barrier layer blocks migration of compounds created during oxidation of the organic oxygen scavenging material from the layer carrying the organic oxygen scavenging material to the interior of the package in which the composition of this invention is incorporated. In one embodiment, the polymeric selective barrier layer has a glass transition temperature greater than about 5 DEG C above the use temperature of the package in which the composition of this invention is incorporated. In another embodiment, the polymeric selective barrier layer has a glass transition temperature greater than about 40 DEG C. In yet another embodiment, the polymeric selective barrier layer is an oriented polymer. In a further embodiment, the layer carrying the organic oxygen scavenging material is a polymer having oxidizable sites in the polymer and containing a transition metal salt catalyst.
Abstract:
A water dispersible ethylene polymer contains (a) structural units produced from at least one alpha-olefin, and (b) at least one solubility enhancing functionality selected from among salts of an alpha,beta-ethylenically-unsaturated carboxylic acid and esters of polyalkylene glycol monoethers, which functionalities are present in an amount effective to render the polymer at least substantially dispersible in water. Preferably, the polymer also contains structural units produced from esters of alpha,beta-ethylenically-unsaturated carboxylic acids. These polymers can find particular utility as components within adhesives, e.g., hot melt adhesives, and as packaging materials. Moreover, due to their water dispersibility, they are considered recyclable and/or repulpable and thus, they can be effectively employed within the paper and pulp industry. In another aspect, a process for the production of these water dispersible polymers is provided.
Abstract:
A process for reducing the amount of down time or yield loss associated with a sulfur upset when using a sulfur-sensitive catalyst. The process comprises applying a metallic coat, cladding, plating or paint to a reactor system which comprises a base metal, so as to form an adherent metallic layer on the base metal and thereby produce a metal-coated reactor system; loading a sulfur-sensitive catalyst into the system; and, after a sulfur upset, using a process comprising sulfur stripping to remove sulfur contaminants from the metal-coated reactor system.
Abstract:
An intermediate pore size molecular sieve supported catalyst includes a platinum group component and a gallium, zinc, indium, iron, tin or boron component. It is used for reforming and aromatization during which it produces a para-xylene enriched product. It comprises an intermediate pore size molecular sieve support, a platinum group component and a component selected from the group consisting of gallium, zinc, indium, iron, tin or boron. One form of the catalyst is first coked and is then contacted with hydrogen. The catalyst is useful in reforming and aromatizing operations.
Abstract:
Provided is a process for catalytic reforming a hydrocarbon feedstock containing at least 20 ppbw sulfur. The process comprises passing the hydrocarbon feedstock through at least two serially connected reforming zones, with each zone containing a highly sulfur sensitive reforming catalyst. The catalyst in the first reforming zone is more frequently regenerated than the catalyst in the second reforming zone. The result is a highly efficient and simplified process for reforming a sulfur contaminated hydrocarbon feedstock. The process basically employs a minor portion of the highly sulfur sensitive reforming catalyst as both the reforming catalyst and a sulfur removal agent.
Abstract:
Disclosed is a catalyst precursor, useful to make catalysts useful in the polymerization of olefins, comprising the product obtained by adding a preformed magnesium source to a solution comprising a solvent having dissolved therein a transition metal compound and an alkyl halide.