E.i. Dupont De Nemours and Company

David John Van Bramer

Charles Joseph Noelke

William George O'Brien

Raymond C Harker

Mark B Shiflett

Akimichi Yokozeki

John James Barnes

Henry Max Schleinitz

Patrick Michael Murphy

Kenneth Paul Kelch

Thomas D Sandbrook

The present invention relates to the process of pyrolyzing tetrafluoroethylene to hexafluoropropylene by carrying out the pyrolysis in a tubular reactor that is lined with either nickel or nickel alloy which contains no greater than 8 wt % chromium.

Synthesis of hexafluoropropylene

A process for removing carbon dioxide from a fluorocarbon carbon dioxide mixture in which the fluorocarbon carbon dioxide mixture is contacted with a semipermeable polyimide membrane to form at least one exit stream having an increased concentration of carbon dioxide and at least one exit stream having a reduced concentration of carbon dioxide.

CO.sub.2 removable from fluorocarbons by semipermeable membrane

A process for separating carbon dioxide from an unsaturated fluorinated compound carbon dioxide mixture comprising contacting the unsaturated fluorinated compound carbon dioxide mixture with a semipermeable membrane to form at least one exit stream having an increased concentration of carbon dioxide and at least one other exit stream having a reduced concentration of carbon dioxide.

Separation of CO.sub.2 from unsaturated fluorinated compounds by

Tetrafluoroethylene is safely shipped or stored in the form of a liquid mixture with 35 to 65 mol % hexafluoropropylene.

Tetrafluoroethylene shipping/storage mixtures

In the process of pyrolyzing chlorodifluoromethane to form tetrafluoroethylene, yield is improved by having a controlled concentration of perfluorocyclobutane in the feed to pyrolysis.

Synthesis of tetrafluoroethylene

Tetrafluoroethylene is made safe (non-explosive) to handle by forming a liquid solution of tetrafluoroethylene and carbon dioxide, one in the other, in a pressurized container.

Growing community of inventors

Belpre, OH, United States of America

David John Van Bramer