Akzo N.v.

Flexsys America L.p.

Flexsys B.v.

Antonius Johannes Van Hengstum

Roger Keranen Rains

Ralph Albert Genetti

Edward Albert Lambers

Ludwig Eisenhuth

Jacobus J Heinerman

Johannes W Schoonhoven

Jan I De Jong

Menno De Mind

Robertus Hermanus Jozef Bloemenkamp

A process for preparing an optionally substituted 4-aminodiphenylamine comprising reacting an optionally substituted aniline and an optionally substituted nitrobenzene in the presence of water and a base while controlling the water content so as to ensure a molar ratio of water to the base charged of not less than about 4:1 at the start of the coupling reaction and not less than about 0.6:1 at the end of the coupling reaction to produce 4-nitrodiphenylamine and/or 4-nitrosodiphenylamine and/or salts thereof. The coupling reaction is followed by a hydrogenation reaction where the coupling reaction product is hydrogenated in the presence of a hydrogenation catalyst and added water so as to ensure a molar ratio of total water to base of at least about 4:1 at the end of hydrogenation. Aqueous and organic phases are obtained and the optionally substituted 4-aminodiphenylamine recovered from the organic phase.

Process for preparing 4-aminodiphenylamines

The invention relates to a process for preparing a thiuram disulfide comprising reacting a secondary amine with carbon disulfide in the presence of oxygen and a metal catalyst in the absence of a solvent using a secondary amine of which the corresponding thiuram disulfide is liquid under the reaction conditions. The invention also pertains to the use of said thiuram disulfides as vulcanization accelerators or lubricant oil additives.

Solvent-free process for preparing thiuram disulfides

A process for the catalytic hydrodesulfurization of hydrocarbon- containing feeds using a catalyst of a phosphorus component, a cobalt component and a Group VIB metal component on an alumina carrier.

Process for the hydrodesulfurization of light hydrocarbon feeds

Ex situ presulfidation of hydrotreating catalysts comprising impregnating the catalysts with an aqueous solution of an organic sulfur compound, e.g. the diammonium salt of 2,5-dimercapto-1,3,4-thiadiazole and 2,2'-dithiodiethanol, followed by drying of the impregnated material. The dried material is activated by contacting it with hydrogen gas at elevated temperature.

Process for the preparation of a resulfided catalyst

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Deventer, Netherlands

Antonius Johannes Van Hengstum