Abstract: The present invention relates to a process for removing carbonyl sulfide from a liquid hydrocarbon feedstock, said process comprising the steps of (a) passing said hydrocarbon feedstock over an absorbent material comprising nickel deposited on a support material wherein nickel is present as both nickel oxide and metallic nickel and wherein the absorbent material has been conditioned by passing an inert gas flow containing a minor amount of propylene; and (b) recovering a liquid hydrocarbon stream having a substantially reduced carbonyl sulfide content.

Abstract: Alkynes are selectively hydrogenated in alkene rich hydrocarbon feeds, such as 1,3-butadiene-rich C.sub.4 cuts, by passing the hydrocarbon feed at least partially in liquid phase over a palladium-based catalyst in the presence of hydrogen, preferably in trickle mode, followed by passing the effluent, at least partially in liquid phase preferably containing about 300-400 ppmw alkynes, over a copper-based catalyst in the presence of hydrogen thereby producing a hydrocarbon product of significantly reduced alkyne concentration.

Abstract: Compositions for dispersing oil slicks on water comprising a solution of surface-active agents in a mixture of water and hydrocarbon solvent. The surface-active agents are a mixture of emulsifying agents and a lower amount of wetting agent. The mixture of emulsifying agents comprising two blends, A and B, of sorbitan derivatives, blend A having an HLB of about 8.5 to 9.5 and blend B having an HLB of about 8 to 10 wherein the weight ratio of blend A to blend B is between about 0.5:1 and 4:1.

Abstract: Green briquettes made from particulate carbonaceous material and lignosulfonate as a binder are cured in an oven in the presence of circulating gases containing a high percentage of oxygen and superheated steam. The sulfur derived from the binder is oxidized and then hydrolyzed (exothermic reactions) at the curing temperature with formation of sulfuric acid, which is dissociated (endothermic reaction) in the case of a temperature rise. The reactions provide a means for thermal balance within the curing oven.

Abstract: A process for the treatment of a gas oil fraction to produce a lighter fraction useful as diesel fuel and/or gasoline comprising subjecting the gas oil fraction to dewaxing and mild hydracracking treatments. The dewaxing is carried out over a silicalite dewaxing catalyst. The dewaxing and mild hydrocracking treatments may be carried out sequentially or simultaneously. The gas oil feed may be passed successively through a silicalit-catalyst bed, a bed of hydrotreating catalyst and a bed of hydrocracking catalyst.

Abstract: The present invention provides a catalyst system for the polymerization and copolymerization of olefins with the system comprising a chiral, stereorigid hafnium metallocene catalyst in combination with an aluminum compound. The aluminum compound is preferably an alumoxane and may be a mixture of alumoxane and trimethyl aluminum. It was discovered that this mixture causes a transformation of the catalyst over time. The catalyst system may also include a solvent to increase the solubility of the metallocene catalyst. It was discovered that these catalyst systems produce useful polymer products with molecular weights greater than 10,000.

Abstract: A novel crystalline silica composition having a silica to alumina atomic ratio not lower than 80 and having a certain specific X-ray diffraction pattern after calcination in air for at least 3 hours at a temperature of at least 500.degree. C.

Abstract: The invention relates to a continuous flow process for producing polystyrene having discrete particles of rubber included therein. The process utilizes a pre-inversion reactor, in which a solution of styrene, polystyrene and rubber are mixed prior to being introduced into a second stirred tank reactor. The viscosity of the solutions in the pre-inversion reactor and in the second stirred tank reactor are closely controlled to produce desirable HIPS products.

Abstract: A process for the alkylation of aromatic compounds employing silicalite of extremely low sodium content. A feedstock containing an aromatic substrate such as benzene is supplied along with an alkylating agent such as ethylene to a reaction zone containing a silicalite alkylation catalyst having a sodium content of less than 100 ppm Na.sub.2 O. Steam may be cofed to the reaction zone in an amount of at least 1 wt. % based upon the aromatic substrate. The low sodium silicalite has a substantially better aging quality in the alkylation process than does silicalite which normally has a higher sodium content.

Abstract: Disclosed is a process for preparing crystalline silicas having the monoclinic symmetry which comprises the step of calcining in air for at least 3 hours at a temperature of at least 500.degree. C. a crystalline silica of the silicalite type having a silica to alumina atomic ratio of at least 80.

Abstract: Compositions for treating metal, e.g., steel sheets which act as compositions lubricants during stamping of the sheets and protect the sheets against rust during their storage and before and after the stamping thereof.The compositions comprise a mineral oil, a basic calcium salt of arylaromatic sulphonic acid, a further anti-rust agent, a saturated higher fatty acid, a non-ionic wetting agent and an anti-oxidizing phenolic compound.

Abstract: A process for preparing pigmented PVdF-based powder coating products is disclosed, which comprises the steps of (i) mixing PVdF resin with a compatible thermoplastic resin, preferably PMMA in a weight ratio of about 80:20 to 40:60, with pigments, and with a small amount of flow promoter, (ii) pelletizing the mixture of (i), and (iii) cryogenically grinding the pellets and sieving the large particles. Also disclosed is a process for coating a substrate, comprising the steps of (a) applying the above prepared powder coating product on a substrate, and (b) subjecting to a heat treatment.

Abstract: A process for pretreating a Ziegler-type catalyst for use in olefin polymerization reactions. An olefin monomer is aded to a fluid carrier stream containing a Ziegler-type catalyst. The carrier stream containing the monomer and the catalyst is passed through an elongated tubular reactor at a flow rate sufficient to provide a residence time in the tubular reactor of less than 1 minute and under temperature conditions to prepolymerize the catalyst within the tubular reactor without plugging of the reactor. In a specific embodiment the residence time within the reactor is no more than 10 seconds, and more particularly, no more than 2 seconds.

Abstract: A process for the decomposition of a halogenated organic compound which comprises contacting the compound with a polyglycol and an alkali or alkaline-earth hydride, optionally in the presence of an alkali salt, at a temperature which does not exceed 100.degree. C., and under an atomosphere having a reduced oxygen content.The process is particularly useful for the decontamination of industrial oils containing chlorinated biphenyls because the treated oil is not degraded during the decontamination process.

Abstract: A paint composition comprising a film-forming polymer, and at least one sparingly soluble metalliferous pigment, and wherein said polymer comprises (A) from 20 to 45 wt. % of monomer units of at least one triorganotin salt of an olefinically unsaturated carboxylic acid; (B) from 5 to 35 wt. % of at least one comonomer selected from the group consisting of VP (vinylpyrrolidone), VPi (vinylpiperidone) and VC (vinylcaprolactam), and wherein the total of A+B amounts to from about 40 to about 70 wt. % of the polymer composition; and (C) the balance of said polymer being monomer units of at least one C.sub.1 -C.sub.4 alkyl methacrylate, styrene and mixtures of said methacrylate and styrene.

Abstract: A process for the disproportionation of a toluene feedstock containing ethylbenzene over an aluminum deficient mordenite catalyst. The mordenite catalyst has a silica/alumina mole ratio of at least 30. The feedstock contains at least 5 wt. % ethylbenzene. Hydrogen is supplied to the disproportionation reactor zone along with the toluene feedstock.

Abstract: A catalytic treatment process is disclosed, which is carried out under pressure, in the presence of water, and with a molecular sieve catalyst which is TEA-silicate or silicalite previously stabilized by halogenation. This process may be applied to the aromatization or to the isomerization of hydrocarbon feedstocks, and to the oligomerization of olefins. The conversion rate of the process is very stable as a function of time.

Abstract: Disclosed is an autoreplicative plasmid containing DNA which encodes herbicide resistance, such that the plasmid is capable of transforming a yeast cell to become resistant to one or more organic herbicide growth inhibitors. Also disclosed is a process for the selective culture of yeasts transformed by the plasmid.

Abstract: A process for removing the basic nitrogen compounds from gas oils comprises treating the gas oils with a homogeneous solvent mixture comprising a diluted aqueous acid solution and an alcohol having from 1 to 6 carbon atoms, the volume ratio of alcohol to diluted aqueous acid solution being between 90/10 and 10/90, the volume ratio of solvent mixture to gas oils being between 0.5 and 5.

Abstract: The present invention relates to a process for producing alcohols comprising hydrogenating compounds selected from the group consisting of acids, esters and aldehydes under sufficient hydrogen pressure and temperature in the presence of a catalyst comprising a copper chromite first component and a second component consisting essentially of copper deposited on a support.