E.i. Dupont De Nemours and Company

Ulrich Klabunde

Rolf Mulhaupt

Frederick N Tebbe

Allan Cairncross

Mitchell Scott Chinn

Peter Hill

Edward J Newitt

The disclosure provides a process for removing dissolved niobium, titanium, and zirconium impurities from an iron chloride solution having an iron concentration of about 50 to about 250 grams/liter comprising: (a) heating the iron chloride solution comprising a compound selected from the group consisting of a niobium compound, titanium compound, zirconium compound, and mixtures thereof, in a vessel, at a temperature of about 120&#xb0; C. to about 300&#xb0; C., and at least autogenous pressure, to precipitate the compound as a solid; and (b) separating the solid from the iron chloride solution. The separation of the solid is accomplished by filtration, settling, or centrifugation. In one embodiment, the iron chloride solution is a byproduct of the chlorination process for making titanium dioxide.

Process for removing impurities from iron chloride solutions

The process and product are disclosed for mounting free-flowing particles, which employ a support having a support surface with an array of tacky areas which have a size and bonding strength suitable for adhesion of either one or two of said particles. In the process the particles flow across the support surface to allow particles to contact the tacky areas and adhere thereto. An array of mounted particles may thus be provided which has at least 50% singly or doubly mounted particles.

Method and product for particle mounting

Preparation of ethylene copolymers from ethylene and polar and/or non-polar comonomers in the presence of selected nickel-containing catalysts.

Nickel containing organo-metallic compound as catalyst

Nickel-catalyzed copolymerization of ethylene

Nickel catalysts for copolymerization of ethylene

Admixing an aluminum alkyl, and optionally a boron compound, with a hydride of nitrogen in the gas phase and maintaining a gas phase temperature, optionally in the presence of a carrier gas, and producing aluminum nitride alone or in admixture with a precursor thereof or boron nitride or both.

Gas phase preparation of aluminum nitride

Metal halide particles useful, among other things, as olefin polymerization catalyst precursors and catalyst supports, are prepared by vaporizing the metal halide and then condensing it in the presence of a diluent.

Metal halide vaporization into diluents

Preparation of polyethylene in the presence of selected nickel-containing catalysts.

Nickel-catalyzed polymerization of ethylene

Metal halide particles useful, among other things, as olefin polymerization catalyst precursors and catalyst supports are prepared by vaporizing the metal halide and then condensing it in the presence of a diluent.

Described is a cyclic process for preparing p-phenylenediamine from aniline and ammonia including aminating iodoaniline, recovering the iodide from the amination, and electrolyzing the iodide with aniline back to iodoaniline. Also described are the two basic reactions of the cyclic process, a new process for preparing phenylenediamines by the amination of the corresponding iodoanilines with ammonia in the presence of copper metal or a copper(I) salt and a new process for preparing p-iodoaniline by electrolysis of aniline with ammonium iodide as well as a new compound useful in the amination.

Preparation and amination of iodoaniline

Described is the process of interconverting p-iodoaniline and o-iodoaniline, particularly converting p-iodoaniline to o-iodoaniline overall, by heating the former in the presence of aniline and, optionally, a mineral or organic acid.

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West Chester, PA, United States of America

Ulrich Klabunde