Basf Se Corporation

Johannes Jacobs

Kai Thiele

Thomas A Grzanka

Eckhard Stroefer

Ulrich Penzel

Steven D Gagnon

Robert A Doerr

Kenneth K Bordelon

Torsten Mattke

Heiner Schelling

Wolfgang Mackenroth

Stefan Maixner

Michael Bock

Andreas Wölfert

Matthias Eiermann

Jon S Speier

Tsung-Chieh Cheng

Kerstin Heinen

Anne-Kathrin Merten

Christian Tragut

Myung Un Won

Dirk Hablawetz

Dave Beckwith

Uwe Storck

William Portwood

Steven Dallas Gagnon

Thomas Grzanka

The invention relates to a method for purifying mixtures comprising 4,4'-methylenediphenyl diisocyanate, which comprises purifying by distillation a mixture I comprising 4,4&#x2032;-methylenediphenyl diisocyanate having a hydrolyzable chlorine content as specified in ASTM D4663-10 of greater than 100 ppm by means of a column K, wherein the gaseous stream comprising the mixture I is brought into contact in the column Kwith at least one liquid compound A which has the same or higher boiling point than 4,4&#x2032;-methylenediphenyl diisocyanate and which has a hydrolyzable chlorine content as specified in ASTM D4663-10 of a maximum of 100 ppm, and wherein the gaseous stream O obtained at the top of the column comprises 4,4&#x2032;-methylenediphenyl diisocyanate has a hydrolyzable chlorine content as specified in ASTM D4663-10 of a maximum of 100 ppm.

Method for purifying mixtures comprising 4,4'-methylenediphenyl diisocyanate

The invention relates to a process for preparing isocyanates by reacting the corresponding amines with phosgene in the liquid phase, if appropriate in the presence of at least one inert medium, in which the amine and the phosgene are first mixed in a mixing chamber () to give a reaction mixture and the reaction mixture is fed to a reactor, the amine being added through an orifice () arranged coaxially to the mixing chamber () and the phosgene being added through feed orifices () in at least two planes () arranged at right angles to the axis () of the mixing chamber (), or the phosgene being added through the orifice () arranged coaxially to the mixing chamber and the amine through the feed orifices () in at least two planes () arranged at right angles to the axis () of the mixing chamber (). At least one plane () is arranged upstream and at least one plane () downstream of the orifice () arranged coaxially to the mixing chamber () in main flow direction of the reaction mixture. The mean residence time of the reaction mixture in the mixing chamber () is not more than 20 ms.

Process for preparing aromatic isocyanates

This invention provides a method for purifying a chlorine supply that includes a chlorine component, a bromine component, and nitrogen trichloride. The method includes the steps of introducing the chlorine supply into a vaporizer, heating the chlorine supply in the vaporizer to form a vapor, and introducing the vapor into a distillation system to provide purified chlorine gas, a distillate that includes liquid chlorine and the bromine component, and a bottoms component including the nitrogen trichloride. The method also includes the steps of condensing the vapor in a reflux condenser, heating the condensate in a reboiler, removing the purified chlorine gas from the distillation system, and removing the distillate from the distillation system.

Method for purifying a chlorine supply

The invention relates to a method of measuring entry of water and resulting corrosion in plants for producing isocyanates by reacting phosgene with one or more primary amines in a solvent. The invention further relates to an apparatus for producing such isocyanates, in the work-up section of which probes for monitoring corrosion are arranged in defined places.

Method of measuring entry of water into phosgene-conducting plants

The invention relates to a process for preparing mixtures of diphenylmethanediamine and polyphenylenepolymethylenepolyamines, which comprises the steps

Method for producing diphenylmethane diamine

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Ossendrecht, Netherlands

Johannes Jacobs