Occidental Chemical Corporation

Praxair Technology, Inc.

David C Johnson

Michael C Savidakis

Michael J Fifolt

Ronald F Spohn

Lloyd Anthony Brown

William S Derwin

Xuemei Song

Thomas Thompson

Daniel R Thielen

Ramesh Krishnamurti

Robert A Buchanan

Habib Hichri

This invention relates in part to a method for preparing a pressure vessel for receiving high purity acetylene at elevated pressure. The method involves providing a porous filler-containing pressure vessel, deep cleaning the porous filler-containing pressure vessel, purifying a solvent, and charging the purified solvent into the deep cleaned, porous filler-containing pressure vessel. The pressure vessel is then charged with high purity acetylene for storage, transport and/or delivery of the high purity acetylene. The high purity acetylene may be useful as a source material for depositing carbon and carbon-containing films in semiconductor applications.

Cylinder preparation for high purity acetylene

Disclosed is a method of isolating the aromatic product formed when a substrate having the general formula

Isolation of products from selective dehalogenation of haloaromatics

Disclosed is a method of adding 1 to 4 chlorine or bromine atoms to an aromatic ring of compound that has at least one electron-withdrawing groups on that ring. The aromatic compound is reacted with a chlorinating agent or a brominating agent in the presence of about 0.1 to about 10 mole % of a Lewis acid catalyst at a temperature of ambient to about 100&deg; C. and a pressure of about 10 to about 100 psig.

Pressurized chlorination and bromination of aromatic compounds

Disclosed is a method of adding 1 to 4 chlorine or bromine atoms to an aromatic ring of compound that has at least one electron-withdrawing groups on that ring. The aromatic compound is reacted with a chlorinating agent or a brominating agent in the presence of about 0.1 to about 10 mole % of a Lewis acid catalyst and about 0.001 to about 0.1 equivalents of an iodine-containing cocatalyst at a temperature of ambient to about 100.degree. C.

Chlorination and bromination of aromatic compounds at atmospheric

Disclosed is a method of making m-chlorobenzotrifluoride. Benzotrifluoride is reacted with chlorine gas in the presence of about 0.1 to about 5 mole % (based on benzotrifluoride) of a metal chloride which can be FeCl.sub.3, SbCl.sub.3, or AlCl.sub.3 and about 0.025 to about 5.0 mole % (based on benzotrifluoride) of a catalyst having the formula ##STR1## where Z is halogen, alkyl from C.sub.1 to C.sub.6, alkoxy from C.sub.1 to C.sub.6, or fluoroalkyl from C.sub.1 to C.sub.6, n is 0 to 5, and the molar ratio of metal chloride to cocatalyst is about 0.5 to about 4.

Growing community of inventors

Cheektowaga, NY, United States of America

David C Johnson