The Dow Chemical Company

Mark J Hazelrigg

Donald L Caldwell

Richard N Beaver

Hiep D Dang

Frank W Spillers

Robert E Hefner, Jr

Hans R Friedli

John L Nafziger

This invention is a process for removing volatile impurities from a crude isocyanate compound which is prepared in the phosgenation of a primary amine, comprising heating said crude isocyanate compound to a temperature to volatilize said volatile impurities in the presence of an acidic material containing a plurality of strong acid groups. The process permits faster, more complete removal of hydrolyzable chloride impurities than conventional processes.

Process for reducing the quantity of hydrolyzable chlorides in

Vertical chlor-alkali cell metal anode in the shape of a double L having a hollow interior and a footing which can be attached to the anode's base by manipulations external to the anode's interior and whose hollow interior allows generated chlorine gas to rise inside the anode's interior, and whose design reduces the electrode gap thereby reducing the cell's operating voltage.

Method for making double L-shaped electrode

Double L-shaped electrode for brine electrolysis cell

Electroconductive substrates for use as oxygen electrodes are coated with an optional interface layer and then with cobalt oxide spinels conforming substantially to the empirical formula

Electrodes for oxygen manufacture

Electroconductive substrates are coated with an interface layer and then with cobalt oxide spinels conforming substantially to the empirical formula

Substituted cobalt oxide spinels

Electroconductive substrates are coated with substituted cobalt oxide spinels conforming substantially to the empirical formula

Electroconductive substrates are coated with substituted cobalt oxide spinels conforming substantial to the empirical formula

Cohalogenation of unsaturated polyesters containing pendant unsaturation and a dicyclopentadienyl ester of an .alpha.,.beta.-unsaturated carboxylic acid is carried out at room temperature or lower to simultaneously and selectively halogenate the non .alpha.,.beta.-unsaturation. These materials have utility in plastics, such as fire-retardant castings.

Cohalogenation process for polyesters

Electrodes particularly suitable for use as anodes in electrolytic cells are prepared by coating an electrically-conductive substrate with a thermally-decomposable inorganic cobalt compound and then thermally oxidizing the inorganic cobalt compound under conditions at which the single-metal spinel, Co.sub.3 O.sub.4, is formed.

Growing community of inventors

Lake Jackson, TX, United States of America

Mark J Hazelrigg