The Dow Chemical Company

Stephen B Willis

Pamela J Boyce

David A Wilson

George M St George

Joseph D Henry

A process for preparing a ferric chelate of an aminopolycarboxylic acid wherein an iron-containing material is reacted with an aminopolycarboxylic acid chelant in the presence of a base, which comprises employing reactants such that the molar ratio of chelant to iron is from about 0.8 to about 0.99, is disclosed. In preferred embodiments the chelate is a ferric ammonium ethylenediaminetetraacetic acid chelate. The inventive chelates show a reduced tendency to form a dark precipitate upon standing. This process is particularly suitable for use in preparing chelates for use in applications such as photographic bleaching. The corresponding ferric chelate composition and products prepared by the described process are also disclosed.

Preparation of ferric aminopolycarboxylate solutions having improved

An aqueous hydraulic cement slurry is disclosed which comprises water, a hydraulic cement, a surfactant and, as a fluid loss additive, epihalohydrin derivatives of polyalkylenepolyamines.

Modified polyalkylenepolyamines

Modified polyalkylenepolyamine compositions are prepared which are useful as fluid loss additives.

Aqueous hydraulic cement slurry

In a process of making ethanolamines by reacting ethylene and ammonia and wherein ammonia is used in excess of the stoichiometric amount, the improvement comprising flashing and liquification at least part of the excess ammonia in the effluent prior to recycling. This moderates the operating conditions and simplifies the equipment needed to recycle the balance of the ammonia.

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Lake Jackson, TX, United States of America

Stephen B Willis