Fmc Corporation

Emc Corporation

Louis T Gunkel

John Crosby

Douglas G Placek

Paul J Beck

Henry J Barda

Theodore F Munday

Charles V Juelke

Sundeep G Shankwalkar

Michael P Marino, Jr

Arsenic is removed from elemental phosphorus by treating it with an oxidized form of iodine in a sufficient amount and for a sufficient time to obtain the amount of arsenic reduction desired. When iodine is the source of the oxidized iodine an oxidant is additionally used. An oxidant is optionally used when an oxidized iodine is used. The oxidant also reduces the amount of antimony present in the elemental phosphorus, and a dilute oxidant rinse removes any residual iodine source and also results in a water-white liquid phosphorus.

Process for removal of arsenic from elemental phosphorus

A process for purifying elemental phosphorus that contains antimony using an oxidizer, such as hydrogen peroxide, peroxymonosulfate, peroxydisulfate, or a hypochlorite, in a two phase system containing water and phosphorus as the two liquids. A purified elemental phosphorus having 200 ppb or less antimony content.

Method for extracting antimony from elemental phosphorous

A process for purifying elemental phosphorus, by dosing a multi-phase elemental phosphorus system, having an aqueous phase and an immiscible, elemental phosphorus phase containing antimony, with a conditioning agent selected from the group consisting of iron (II) salt or iron (III) salt with free iodine; iron (II) iodide; free iodine; iron (II) sulfate; or iron (III) sulfate in an amount effective to lower the amount of antimony in the phosphorus; agitating the resultant mixture at a temperature above the melting point of phosphorus, but below the boiling point of water, and then separating the aqueous phase from the phosphorus phase to recover a phosphorus lower in antimony content.

Method for extracting antimony from elemental phosphorus

A process is provided for preparing an aryl diphosphate ester containing less than 5% by weight of triarylphosphate. The process reacts a solution of a dihydroxy aromatic compound and an excess of phosphorus oxychloride in a nonaqueous solvent having a boiling point greater than 110.degree. C. The excess phosphorus oxychloride and part of the solvent are distilled from the solution at atmospheric pressure and the intermediate, a diphosphotetrachloridate solution, is reacted with a monohydric aryl compound. After extracting with an aqueous, alkaline solution the product is recovered by distilling off the remaining solvent.

Process for preparing aryldiphosphate esters

The invention is a novel composition of alkylated phenyl phosphate esters comprising by weight 1% to 20% trialkylphenyl phosphate, 10% to 50% dialkylphenyl monophenyl phosphate, 15% to 60% monoalkylphenyl diphenyl phosphate and less than 2% triphenyl phosphate and a process for preparing the composition comprising passing the composition at least once through a thin film evaporator at a temperature of about 200.degree. C. to about 250.degree. C. at a pressure sufficiently less than 5 kPa to evaporate about 5% to about 30% of the composition.

Triaryl phosphate ester composition and process for its preparation

The invention is a process for purifying a solid, storage-stable tris(bromophenyl)phosphate ester dissolving a crude tris(bromophenyl)phosphate in an ester at an elevated temperature, and cooling the solution sufficiently to recover a solid phase.

Process for purifying polybrominated triaryl phosphate esters

The invention is a process for preparing a solid, storage-stable tris(bromophenyl)phosphate ester by the phosphorylation of a bromophenol and recovering the product by cooling a solution of the reaction mixture from a hydrocarbon solvent containing 2 to 20 parts of a C5 to C10 alkane per part of a C6 to C10 arene.

Process for preparing storage-stable tris(bromophenyl)phosphates

A novel process is provided for producing a pure triaryl phosphate ester free from phenolics without creating an undesirable waste product. After recovery of the triaryl phosphate ester the reactio mixture residue is converted into an emulsion suitable for use as a flame retardant useful for application to carpets.

Process for forming a stable emulsion from a triaryl phosphate reaction

A process is provided for making halogen-substituted triaryl phosphate esters which are normally solid under ambient conditions. The process comprises reacting a halogenated phenol with phosphorus oxychloride in the presence of a magnesium chloride catalyst above the melting point of the desired product. After the reaction is complete the product is recovered by adding an alcohol, such as, pentanol, 2-ethyl hexanol or hexanol and cooling the resulting mixture below the melting point of the product.

Process for making solid polyhalotriaryl phosphate esters

An environmentally acceptable process is provided to synthesize a 2-(alkylbenzoyl)benzoic acid suitable for synthesizing a 2-alkylanthraquinone without further purification. Usually the crude product is isolated from the reaction mixture by a succession of steps which generate a large volume of aqueous waste. The present process eliminates or decreases these wastes and produces a product of sufficient purity for synthesizing as 2-alkylanthraquinone.

Process for preparing 2-(alkylbenzoyl)benzoic acid

Liquid mixtures of trialkylphosphine oxides, useful as antistats in thermoplastic polymers, are obtained by alkylating excess phosphine with a mixture of higher .alpha.-olefins to give a mixture of higher alkylated phosphines and unreacted phosphine and alkylating that mixture with a lower .alpha.-olefin. This method provides a larger percentage of higher alkyl groups and a lower percentage of lower alkyl groups compared to alkylating the phosphine with all of the mixed .alpha.-olefins in a single reaction. The shift in higher alkyl groups decreases the volatility of the trialkylphosphine mixture and is an advantage when preparing plastic compositions at higher formulation temperatures.

Liquid mixtures of trialkylphosphine oxides

Flame retardant polyphenylene ether resin compositions are described in which the flame retardant agent is a mixture (by weight) of the following:

Growing community of inventors

Yardley, PA, United States of America

Louis T Gunkel