Ethyl Corporation

Ali M. Dadgar

Donald O. Hutchinson

Keith G. Anderson

Donald O Hutchinson

Keith G Anderson

Ali M Dadgar

Phillip R Beaver

Frederick W Frey

Marcelian F Gautreaux

Peter M DiGiacinto

Ranjit K Roy

Julio J Vega

John H McCarthy

Walter E Foster

This invention relates to a process for preparing a white bisimide product which principally contains N,N'-alkylene-bis(tetrabromophthalimide) or N,N'-bis(tetrabromophthalimide). The process features: providing, in a reaction vessel, a solution containing tetrabromophthalic anhydride and a solvent which contains at least about 15 weight percent of a mono-, di- or tri- carboxylic acid having a dissociation constant not higher than 1.0.times.10.sup.-3 at 25.degree. C.; forming a reaction mass by adding to the solution a diamine or a diamine salt formed by the partial or total diamine neutralization of a mono-, di- or tri- carboxylic acid having a dissociation constant not higher than 1.0.times.10.sup.-3 at 25.degree. C., such formation of the reaction mass resulting in the production of a bisimide precipitate which becomes a constituent of the reaction mass; during the formation of the reaction mass, (i) retaining, in the reaction mass, at least a portion of the water produced during such formation, (ii) maintaining a substantially constant pressure in the reaction vessel, and (iii) not allowing the temperature of the reaction mass to reach a temperature below about 135.degree. C.; terminating the addition of the diamine or diamine salt when the molar ratio of the tetrabromophthalic anhydride initially present in the solution to the diamine or diamine salt added is from about 1.9:1 to about 2.1:1; and recovering, as the bisimide product, the bisimide precipitate.

Process for preparing bisimide products

Methods for purifying and agglomerating hexabromocyclododecane particles by heating an admixture formed with wetcake and water.

Recovery of hexabromocyclododecane particles

In a first embodiment this invention relates to a process for preparing a white product which principally contains a bisimide. The process comprises: providing tetrabromophthalic anhydride and a solvent in a reaction vessel; forming, at a temperature within the range of from about 140.degree. C. to about 200.degree. C., a reaction mass by adding a diamine, a diamine salt or a mixture thereof to the solution, the formation of the reaction mass resulting in the production of a bisimide precipitate which becomes a component of the reaction mass; terminating the addition of the diamine when the molar ratio of the tetrabromophthalic anhydride initially present in the solution to the diamine or diamine salt added is substantially stoichiometric; cooking the bisimide precipitate to increase the average sphericity of the particles making up the bisimide precipitate; and recovering from the reaction mass, as the bisimide product, the cooked precipitate. In a second embodiment the cooking step is optional and the retention of water formed during the diamine or diamine salt addition is featured.

Process for preparing bisimides products

A process for producing aluminum from raw aluminum silicate ore, especially kyanite, including comminuting a natural or raw mined kyanite ore to a desired particle size, beneficiating the ore to form a kyanite concentrate, compacting the concentrate along with a carbon reductant into agglomerates such as briquettes, pellets or other suitable form and to a desired size, carbothermically reducing the compacts in an electric arc furnace into an aluminum-silicon alloy, comminuting the aluminum-silicon alloy into a desired particle size, reacting the aluminum-silicon alloy particles with hydrogen and propylene to form tripropylaluminum and dipropylaluminum hydride, pyrolyzing or decomposing the tripropylaluminum and dipropylaluminum hydride in an oil medium or bath to form an aluminum powder, filtering, washing and drying the aluminum powder, and fluxing and casting the aluminum powder into pigs or other suitable form, thereby forming a substantially pure aluminum product.

Aluminum process

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Baton Rouge, LA, United States of America

Donald O Hutchinson