Abstract: A process for producing polyethylene having a broad molecular weight distribution is provided, in which ethylene and optionally a comonomer are contacted in two reactors connected in series, one reactor containing a titanium-based catalyst and the other reactor containing a vanadium-based catalyst and a halohydrocarbon promoter, or alternatively, both reactors containing a mixed metal catalyst comprising both titanium and vanadium. In the latter case, the halohydrocarbon promoter is present in only one of the reactors to activate the vanadium sites of the catalyst and deactivate the titanium sites of the catalyst simultaneously.

Abstract: An improved polymerization process for making essentially non-agglomerated ethylene polymers, especially EPR polymers, based on the use of a high activity vanadium catalyst, which utilizes an alkylated metal chain transfer agent to moderate the kinetics of the polymerization reaction so as to avoid formation of an undesirable amount of agglomerated polymer.

Abstract: An improved support vanadium catalyst, especially an improved Beran et al. catalyst system and ethylene polymerization process in which the improvement derives from fixing the promoter to a component of the catalyst composition such that it is a molecularly structural component of the catalyst and thus is not separately fed to the polymerization reaction, but instead is part of the catalyst composition fed to the reaction.

Abstract: Ethylene copolymers having a very low molecular weight are continuously prepared in a fluidized bed in the presence of reduced concentrations of hydrogen, at improved catalyst activity and polymer productivity, by effecting polymerization in the presence of a dialkylzinc compound.

Abstract: An ethylene polymerization catalyst comprising a supported precursor of vanadium trihalide/electron donor complex and alkylaluminum or boron halides, when combined with alkylaluminum cocatalyst and alkyl halide promoter, provides enhanced polymerization and productivity plus superior polyethylene.

Abstract: A vanadium-based catalyst is treated with certain oxygen-containing compounds as a means of narrowing and effectively regulating the molecular weight distribution of the polymers produced with the catalyst.

Abstract: A vanadium catalyst composition comprising:(i) the reaction product of a vanadium compound and an electron donor, which is a liquid, organic Lewis base in which the vanadium compound is soluble;(ii) a hydrocarbyl aluminum cocatalyst; and(iii) a promoter having the following formula:C.sub.3 (X).sub.a (F).sub.b (H).sub.

Abstract: A vanadium-based catalyst is treated with certain oxygen-containing compounds as a means of narrowing and effectively regulating the molecular weight distribution of the polymers produced with the catalyst.

Abstract: A process for the preparation of aluminoxanes comprising introducing, under reaction conditions, at least one stream of water beneath the surface of an agitated solution of a hydrocarbyl aluminum compound in such a manner that the stream of water is essentially immediately dispersed on contact with the solution.

Abstract: An ethylene polymerization catalyst comprising a supported precursor of vanadium trihalide/electron donor complex and alkylaluminum or boron halides, when combined with alkylaluminum cocatalyst and alkyl halide promoter provides enhanced polymerization and productivity plus superior polyethylene.

Abstract: Regenerative process for the purification of a non-reacting industrial gas stream by removal of trace amounts of carbon dioxide therefrom, comprising contacting said gas stream with non-aqueous liquid solution of at least one member selected from the group consisting of: (a) hydroxides and weak acid salts of sodium, potassium, and lithium and (b) specific liquid aliphatic polyhydric alcohol; separating the purified industrial gas from the reaction products of said contacting step including said solution; increasing said reaction products stream to an elevated temperature up to 200.degree. C.; reducing the partial pressure of carbon dioxide in the vapor phase above said reaction product stream; separating carbon dioxide from said reaction product stream; and recycling the treated reaction product stream to said liquid body of said solution for contacting a further quantity of said industrial gas stream.

Abstract: A process is disclosed for the purification of an inert or non-reacting gas such as lower mono-olefins by the removal of trace amounts of reacting impurities such as carbon dioxide therefrom, comprising passing said gas through an essentially non-aqueous liquid solution of alkali or alkaline earth metal hydroxides and/or weak acid salts and certain selected liquid polyhydric alcohols.

Abstract: A process for producing acetic acid and acetaldehyde from ethanol which comprises contacting a mixture of ethanol and oxygen with a supported copper oxide catalyst essentially free of barium, the mole ratio of oxygen to ethanol being from about 0.1 to about 0.5.

Abstract: There is disclosed a process for the separation of ethylene or propylene from a purified, multi-component gas stream produced from the thermal cracking of hydrocarbons and containing ethylene or propylene and other low molecular weight components comprising the steps of: introducing said multi-component gas stream into an aqueous silver salt solution stream to effect the absorption and/or complexing of said contained ethylene or propylene and reaction of trace acetylenes with the silver metal ions of such solution; venting of the silver salt solution stream at reduced pressure to remove the dissolved other low molecular weight components; treating the resulting silver salt solution stream to separate the absorbed and/or complexed ethylene or propylene from the silver salt stream; further treating the resultant silver salt solution stream to release the contained trace acetylenes therefrom and provide an aqueous silver salt stream; and recycling said aqueous silver salt stream to said introducing step.