Occidental Chemical Corporation

Michael C Savidakis

Michael J Fifolt

Charles M Cook

David C Johnson

Ronald F Spohn

William S Derwin

Michael C Hausladen

Daniel R Thielen

David E Albright

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

Ring halogenation 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 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 making a mercaptan by reacting hydrogen sulfide with an olefin in the presence of a heterogeneous acidic catalyst. The catalyst can be made by calcining a mixture of a hydroxide, such as Zr(OH).sub.4 or Ti(OH).sub.4, with an acidic site donor, such as H.sub.2 SO.sub.4, (NH.sub.4).sub.2 SO.sub.4, or WO.sub.3.

Production of mercaptans using heterogeneous acidic catalysts

Disclosed is a method of halogenating the ring of an aromatic compound. The aromatic compound is contacted with a halogenating agent in the presence of a heterogeneous catalyst. The catalyst is the calcination reaction product of:

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 a mercaptan by reacting an aliphatic alcohol with hydrogen sulfide in a continuous gaseous phase reaction. The reaction is performed in the presence of a catalyst which comprises a catalytically active carrier that contains base and/or acid active sites, an alkali metal or alkaline earth metal bicarbonate, carbonate, oxide, or hydroxide, and a transition metal acid or alkali metal or alkaline earth metal salt thereof. Selectivities of close to 100% are obtained.

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Niagara Falls, NY, United States of America

Michael C Savidakis