Cabot Corporation

William L Sifleet

Martin C Green

Anand Prakash

Gregory T Gaudet

David J Kaul

Irina S Yurovskaya

John M Branan, Jr

Steven J List

Jay J Zimmer

Daniel W Weaver

Frank J Hrach, Jr

Ian D Morrison

Meng-Jiao Wang

Yakov E Kutsovsky

Steven E Brown

Allan Clark Morgan

Steven R Reznek

Bin Chung

Ronald C Hurst

Sheldon B Davis

Ted W Bush

William M Porteous

Sergio A Montes

Chung-Huei Shieh

Lawrence J Murphy

Miles Mace

Chiun Huei Shieh

Francois M Terrade

Francois Marie Terrade

Steven List

Carbon blacks, such as rubber blacks, having a low PAH concentration are described. Furthermore, elastomeric or rubber compositions containing the carbon black of the present invention are further described, as well as methods of making carbon black having a low PAH concentration.

Carbon blacks having low PAH amounts and methods of making same

Methods of producing carbon black in a multi-stage reaction are described. Also described is carbon black formed from the processes.

Carbon black and multi-stage process for making same

The present invention relates to a method of providing product consistency of a particulate material or the product containing the same, by measuring and/or analyzing at least one interfacial potential property value of the particulate material. The method may be used as a QA/QC method to insure product consistency.

Methods of providing product consistency

An improved heat exchanger which resists fouling of the heat exchange surface by minimizing the temperature difference between the heat exchanger surface and the fluid stream in contact with the heat exchange surface. In one embodiment, a heat exchanger comprises an outer shell, the outer shell comprising a first inlet operable to pass a first fluid stream, an inner shell at least partially disposed within the outer shell, the inner shell comprising a second inlet and an outlet operable to pass the first fluid stream, and a heat exchange surface comprising a plurality of tubes operable to pass a second fluid stream.

Heat exchanger

An improved heat exchanger which resists fouling of the heat exchange surface by minimizing the temperature difference between the heat exchanger surface and the fluid stream in contact with the heat exchange surface. In one embodiment, fouling of the heat exchanger surfaces in a combustion air heat exchanger may be minimized by minimizing the temperature difference between the heat exchanger surface and the carbon black stream in contact with the heat exchanger surface. In the case of a combustion air heat exchanger, the temperature difference between the heat exchanger surfaces and the carbon black stream is preferably not greater than 500&deg; F., more preferably not greater than 300&deg; F. and even more preferably not greater than 100&deg; F.

A process for producing carbon blacks comprised of mixing an oxidant, primary fuel, and carbon black feedstock to form carbon black particles and aggregates, passing the mixture through a reactor, cooling, separating, and recovering the carbon black product. The improvement comprises the addition of a secondary oxidant-containing stream to the reactor such that the secondary oxidant stream does not interfere with the formation of the carbon black particles and aggregates in the reactor. Also disclosed are new carbon black products defined by the following parameters:

Carbon blacks

A method for increasing the aggregate size and structure of carbon blacks produced by a furnace carbon black reactor by lowering the temperature of, but not stopping pyrolysis in, the effluent (the mixture of combustion gases and feedstock in which pyrolysis is occurring), preferably up to about 800 degrees F., at a residence time between about 0.0 second and about 0.002 second downstream from the furthest downstream point of injection of feedstock.

Tandem quench

Novel furnace carbon blacks that impart advantageous properties to rubber and plastic compositions and may be utilized in the place of acetylene blacks. The furnace carbon blacks have an ash level less than or equal to 50 ppm, preferably less than or equal to 30 ppm, most preferably less than or equal to 10 ppm, a sulfur level less than or equal to 50 ppm, preferably less than or equal to 30 ppm most preferably less than or equal to 10 ppm, a L.sub.a less than or equal to 30 .ANG. and a L.sub.c less than or equal to 30 .ANG.. Also disclosed are novel rubber and plastic compositions incorporating the novel furnace carbon blacks which exhibit advantageous properties, particularly in extending the useful service life of power cables produced using the compositions.

Low ash carbon blacks

Carbon blacks imparting superior treadwear/hysteresis performance and

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Clinton, MA, United States of America

William L Sifleet