Basf Wyandotte Corporation

Toth Aluminum Corporation

Lee H Bergman

Edward J Panek

John W Compton

William M Herring

Clyde G Inks

John J Evangelista

Kathryn M Ellerman

Werner O Moll

Siegfried P Kersten

A process for producing alumina involving reacting anhydrous aluminum chloride with a oxidizing agent with a temperature within the range of from about 700.degree. C. to about 1200.degree. C. to form aluminum oxide and chlorine and separating the chlorine and mixing a portion thereof with the reacting aluminum chloride and oxidizing agent.

Oxidation method for production of special aluminas from pure aluminum

The strength of ice is reduced by dissolving in water prior to freezing a composition of (A) a water-soluble polyhydroxy compound or monoalkylether thereof and (B) an alkali metal carbonate in an amount to provide an effective amount of (A) plus (B). The method is especially useful for application to particulate solids, such as coal and mineral ores, which are shipped and stored in masses exposed to freezing temperatures. Any ice that is formed is physically weak and will not deter the unloading of the thusly conditioned particulate solids.

Freeze modification agent

A continuous process for the preparation in at least one esterification reactor of phthalate diesters utilizing phthalic acid or anhydride and a stoichiometric excess of at least one saturated aliphatic alcohol containing about 4 to about 10 carbon atoms comprises (a) reaction of phthalic acid or anhydride with said alcohol in a reactor zone, (b) purification of the diester in a purification zone in which the reaction product is neutralized with an alkali metal hydroxide, i.e., sodium hydroxide, to separate the diester and the unreacted phthalic acid or anhydride together with said saturated alcohol utilized in the reaction, said reaction product is separated into an organic phase and an aqueous waste phase. The organic phase is washed with water, steam stripped, treated with activated charcoal and filtered to purify the diester product desired, (c) the aqueous phase containing monoester is separated from said organic phase in step (b) is purified by filtration to remove solid impurities, carbon treated to remove color bodies, and acidified and extracted with the same alcohol used in the esterification to obtain an organic phase which can be recycled to the reaction zone of the process without causing discoloration of the desired diester product of the process. In the monoester purification process, acidification is accomplished utilizing a strong organic acid, i.e., sulfuric acid, prior thereto or simultaneously with extraction utilizing the same alcohol used in the esterification process. Purification of the aqueous waste streams produced in the process can be accomplished using activated charcoal to remove organic wastes and precipitation of inorganic salts to remove inorganic impurities produced in the process.

Phthalic acid diester preparation with waste stream purification and

Silicate fouling on the reboilers and trays and the distillation train used for the production of dihydric alcohols is arrested by the addition of caustic to the feed stream.

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Baton Rouge, LA, United States of America

Lee H Bergman