E.i. Dupont De Nemours and Company

Stephan Claude De La Veaux

Jacob Lahijani

Charles David Musick

James Edmond Van Trump

Wesley Memeger, Jr

James E Geary, Jr

Terry S Chern

Juergen Kurt Plischke

Jodi Lynn Witt

Roland T Brierre

Christian Normand

Michael L Trancynger

James B Dunson, Jr

Hans Hellmut Glaeser

George Alan Schurr

Peter Jernakoff

Scott Rickbeil Frerichs

Lu Zhang

William Edward Capelle, Jr

John D Connolly, Jr

Gary Ken Whiting

Ana Estela Diaz

John Phillip Lanci, Sr

John Nicholas Birmingham

Yunghsing Samson Hsu

Suhas Mahuli

Aaron J Becker

Kevin Joseph Leary

Philipp M Niedinzu

Narayanan S Subramanian

Juergen K Plischke

The present invention provides a method and apparatus for the controlled synthesis of nanoparticles using a high temperature process. The reactor chamber includes a high temperature gas heated by means such as a plasma torch, and a reaction chamber. The homogenizer includes a region between the reactant inlets and the plasma (the spacer zone) to ensure that feeds from the reactant inlets are downstream of the recirculation zone induced by the high temperature gas. It also includes a region downstream of the reactant inlets that provides a nearly I dimensional (varying only in the axial direction) flow and concentration profile in the reaction zone to produce nanoparticles with narrow size distribution.

Method of producing nanoparticles using a evaporation-condensation process with a reaction chamber plasma reactor system

There is described a process for preparing metal oxide particles which are substantially free of coarse tail from an oxidizing agent and a vaporous metal reactant in a flow reactor; comprising, (a) directing a flow of the metal reactant into a contacting region of the flow reactor; comprising (a) passing a flow of oxidizing agent through a high temperature zone of the flow reactor to form a flow of hot oxidizing agent and directing the flow of the hot oxidizing agent onto the contacting region of the flow reactor at a flow condition sufficient to form a reaction stream comprising a flow of hot oxidizing agent, a flow of metal reactant and a diffusive flow of the hot oxidizing agent and the metal reactant, the temperature of the hot oxidizing agent being at least sufficient to initiate oxidation of the metal reactant in the diffusive flow; (c) passing the reaction stream into a reaction zone of the flow reactor, while simultaneously introducing a flow of an upper cooling fluid substantially coaxially with the reaction stream to form a fluid curtain which surrounds the reaction stream; (d) maintaining the fluid curtain while the metal oxide particles form within the diffusive flow of the reaction stream and until at least a major portion of the reaction stream is cooled to a temperature below the temperature at which metal oxide particles coalesce; and (e) separating the metal oxide particles from the reaction stream.

Process for making metal oxide nanoparticles

There is described an apparatus for making metal oxide particles which are substantially free of coarse tail from an oxidizing agent and a metal reactant in a flow reactor. The apparatus can be a concentric tubular flow reactor comprising a substantially funnel-shaped reactant contacting region located adjacent to a reaction zone which is able to direct a flow of a hot oxidizing agent towards a flow of the metal reactant to form a reaction stream which flows downstream into a reaction zone, whereby the hot oxidizing agent of the reaction stream is able to surround the flow of metal reactant sufficient to prevent the metal reactant from contacting the wall of the reactant contacting region and forming scale on the wall. A cooling fluid conduit being able to direct a flow of a cooling fluid into the reaction zone to flow coaxially with the reaction stream and to form a fluid curtain between the reaction stream and a baffle, which defines at least a portion of the reaction zone, while the metal reactant and hot oxidizing agent within the reaction stream react to form the metal oxide nanopowder prevents scale from forming on the baffle.

Apparatus for making metal oxide nanopowder

The present invention provides a process for recovering the chlorine value from a particulate feed stream of metal chlorides wherein the total energy and reactant mass flow are managed to minimize the build up of deposits of solids on the reactor walls and maximize the conversion of the metal chlorides to metal oxides and chlorine.

Process for the recovery of chlorine from iron chlorides

An improved fluid energy mill having a curved-shaped insert having a leading edge and a trailing edge with an azimuthal angle of between 10.degree. and 300.degree. and a positive or zero angle of attack is disclosed. This mill provides for lower energy consumption while improving or maintaining product specifications, and improved production rates.

Fluid energy mill

A method for producing para-aramid pulp includes forming a liquid, actively-polymerizing solution and subjecting the solution to orienting flow which produces an optically anisotropic liquid solution with polymer chains oriented in the direction of the flow. When the solution has a viscosity sufficient to maintain the orientation of the polymer chains, the solution is incubated until it gels. The gel is cut transversely at intervals and para-aramid pulp is isolated from the gel. Para-aramid pulp produced by the process can be used similarly to pulp produced from spun fiber.

Method and apparatus for producing para-aramid pulp and pulp produced

Method for producing para-aramid pulp

High modulus, high tenacity fibers of poly-p-phenylene terephthalamide (PPD-T) are disclosed along with a fiber heat treating process for increasing the inherent viscosity and the crystallinity index of the PPD-T. Never-dried fibers swollen with water of controlled acidity are heated beyond dryness.

High modulus poly-p-phenylene terephthalamide fiber

High modulus, high tenacity fibers of poly-p-phenylene terephthalamide (PPD-T) are manufactured comprising a fiber heat treating process for increasing the inherent viscosity and the crystallinity index of the PPD-T. Never-dried fibers swollen with water of controlled acidity are heated beyond dryness in an atmoshphere having a flow of greater than Reynolds Number 10,000 throughout the duration of the heating.

Process for manufacturing a high modulus poly-p-phenylene

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Wilmington, DE, United States of America

Stephan Claude De La Veaux