Ethyl Corporation

Albemarle Corporation

Robert L Davis

Hassan Y Elnagar

Mahmood Sabahi

Bonnie G McKinnie

Saadat Hussain

Robert M Moore, Jr

Paul F Ranken

David N Roark

Michael J Sanders

Burnell Lee

William E Moehle

Edgar E Spielman, Jr

Mark A Templeton

Pranab Choudhury

Aromatic substrates are Ar-brominated in high yield and selectivity by reacting the substrate with a brominating agent in the presence of at least about 0.19 gram per mmol of substrate of a zeolite catalyst which has an absorbed water content of no greater than about 7.5 weight percent.

Selective bromination of aromatic compounds

This invention describes a method for stabilizing bromine biocides in water. A water-soluble bromide salt and a sulfamate source are added to a body of water, and then an oxidant is added to the body of water to form the biocidal bromine species.

Sulfamate stabilization of a bromine biocide in water

An oxidation process for organic compounds employs stabilized bromine chloride solutions as the oxidizing agent. Organic compounds which contain an oxidizable moiety, such as thioanisole and triphenylphosphine, are rapidly converted to sulfoxides and phosphine oxides, respectively, without over-oxidation.

Oxidation process

A bromination process for organic compounds employs stabilized bromine chloride solutions as the brominating agent. Activated aromatic compounds such as anisole can be selectively monobrominated in the para-position in high purity and yield.

Bromination process

This invention relates to a solvent system which is non-flammable and which is comprised of a hydrocarbon solvent having a flash point less than about 38.degree. C. and a second solvent containing at least 90 wt % n-propyl bromide, the second solvent being present in an amount sufficient to obtain no flash point for the solvent system when tested in accordance with ASTM D-93 and the second solvent being the sole halogenated solvent and flash point suppressor in the solvent system.

No flash point solvent system containing normal propyl bromide

This invention relates to a white or at least near white flame retardant product which is predominant in decarbromodiphenylalkane, and which product contains a minor amount of impurities; to a process for preparation of the flame retardant product; to a process for the removal of excess bromine from the product by use of a treatment solution and elevated temperature; and to macromolecular materials utilizing the product as a flame retardant.

Process for decabromodiphenylalkane predominant product

Novel aromatic diamines which are useful as chain extenders for urethane and urea polymers are compounds corresponding to the formula: ##STR1## wherein two of the R, R', and R' substituents are alkyl groups containing 1-6 carbons and the other substituent is a hydrocarbylthio group containing 1-6 carbons.

Aromatic diamines

Novel mixtures of aromatic diamines which are useful as chain extenders for urethane and urea polymers are compounds corresponding to the formula: ##STR1## wherein two of the R, R', and R' substituents are alkyl groups containing 1-6 carbons and the other substituent is a hydrocarbylthio group containing 1-6 carbons.

Aromatic diamine mixtures

Hydrocarbylaluminoxanes are made by introducing liquid water into the free space above an inert hydrocarbon solution of a hydrocarbyl aluminum compound (e.g. trimethyl aluminum) with intensive agitation while maintaining the reaction temperature at -80.degree. C. up to -10.degree. C.

Alkylaluminoxane process

A Lewis acid contaminant is removed from a (hydrocarbylthio)aromatic amine by mixing a solid alkali metal hydroxide with a solution of the Lewis acid in the amine, preferably at about 110.degree.-120.degree. C., and then filtering the solids from the mixture.

Decontamination of (hydrocarbylthio) aromatic amines

(Hydrocarbylthio)aromatic amines are prepared by reacting an aromatic amine, such as an aminobenzene, with a hydrocarbyl disulfide, such as an alkyl disulfide, in the presence of a metal or metal halide catalyst and iodine as a promoter.

Process for preparing (hydrocarbylthio) aromatic amines

(Hydrocarbylthio)aromatic amines are prepared by reacting an aromatic monoamine, such as an aminobenzene, with a hydrocarbyl disulfide, such as an alkyl disulfide, in the presence of hydrogen iodide, ammonium iodide, or cuprous iodide.

(Hydrocarbylthio)aromatic polyamines are prepared by reacting an aromatic polyamine, such as a diaminobenzene, with a hydrocarbyl disulfide, such as an alkyl disulfide, in the presence of an iodide or bromide of a metal other than an alkali metal as a catalyst.

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Baton Rouge, LA, United States of America

Robert L Davis