Basf Aktiengesellschaft

Basf Se Corporation

Basf Corporation

Filip Nevejans

Torsten Mattke

Ulrich Penzel

Eckhard Stroefer

Hans-Juergen Pallasch

Martin Sohn

Peter Van Den Abeel

Wolfgang Mackenroth

Thirumurti L Narayan

Gerhard Olbert

Stefan Maixner

Kai Thiele

Andreas Brodhagen

Andreas Woelfert

David D Peters

Hans Volkmar Schwarz

Manfred Heilig

Jon S Speier

Filip Deberdt

Volker Scharr

Jan D Jacobs

Cynthia Loop

Anthony Lunato

Thomas Schulz

Luc Vanderwaeren

Jan Hammenecker

Joachim Pfeffinger

Markus Siegert

Frank Poplow

Martin Reif

Eckhard Str&ouml;fer

Steffen Oehlenschlaeger

Jan Jacobs

Markus Maurer

Tilmann Steinmetz

Willy Van Pee

Dieter Starosta

Rene Leuthold

Hilmar Boesel

Fritz N&auml;umann

J&uuml;rgen Dosch

The invention relates to a process for preparing isocyanates by reacting primary amines with phosgene in a solvent, where the solvent comprises a dialkyl carbonate.

Process for preparing isocyanates in dialkyl carbonates as solvent

A reactor () for preparing phosgene by gas-phase reaction of carbon monoxide and chlorine in the presence of a solid catalyst, which reactor has a bundle of parallel catalyst tubes () aligned in the longitudinal direction of the reactor whose ends are fixed in tube plates () and have a cap () at each end of the reactor (), and has deflection plates () which are aligned perpendicular to the longitudinal direction of the reactor in the intermediate space () between the catalyst tubes () and leave free passages () located alternately opposite one another on the interior wall of the reactor, and in which the catalyst tubes () are charged with the solid catalyst, the gaseous reaction mixture is passed from one end of the reactor via one cap () through the catalyst tubes () and is taken off from the opposite end of the reactor () via the second cap () and a liquid heat transfer medium is passed through the intermediate space () around the catalyst tubes (), where the reactor () has no tubes in the region of the passages (), is proposed.

Reactor and process for preparing phosgene

The invention provides a process for preparing diphenylmethanediamine, comprising the steps of:

Two-stage process for cost-effective deposition of homogeneous catalysts in MDA synthesis

The invention relates to a process for preparing polyisocyanates by reacting primary amines with phosgene, which comprises the steps

Method for producing polyisocyanates

Reactor and method for producing phosgene

The invention relates to a process for preparing polyisocyanates by reacting organic amines with phosgene, wherein the reaction is carried out in at least three stages, with the first stage being carried out in a mixing apparatus, the second stage in at least one residence apparatus and the third stage in at least one separation apparatus and the pressure in each successive stage being lower than that in the previous stage.

Method for the continuous production of isocyanates

The invention relates to a process for the partial or complete separation of a mixture comprising hydrogen chloride and phosgene, possibly solvents and possibly low boilers and inerts as are typically obtained in the preparation of isocyanates by reaction of amines with phosgene, which comprises firstly carrying out a partial or complete condensation of phosgene, then a distillation or stripping step in a column to remove the hydrogen chloride from the bottom product phosgene and subsequently a scrub of the top product hydrogen chloride by means of the process solvent to absorb the phosgene in the process solvent. An after-purification by means of adsorption on activated carbon or by another suitable method can subsequently be carried out to remove solvent residues.

Separation of a substance mixture consisting of hydrogen chloride and phosgene

The invention relates to a process for preparing isocyanates by reaction of amines with phosgene in the presence of inert organic solvents in a reactor and subsequent work-up of the reaction mixture leaving the reactor, wherein the solvent is separated off in a two-stage or multistage, preferably two-stage, distillation process in which the solvent is separated off at a pressure of 0.1-15 bar in a first apparatus and at 1-900 mbar in a second apparatus or further apparatuses, with the heat of condensation of the solvent vapor from the first apparatus being used for partial or complete vaporization of solvent in the second apparatus.

Method for separating out solvent from a reaction mixture resulting from an isocyanate synthesis and for purifying this solvent

A process is provided for preparing light-colored isocyanates which can be used for preparing urethane compounds, in particular polyurethanes, for example polyurethane foams.

Light isocyanates, method for producing them and use thereof

In a process for preparing mixtures of diphenylmethane diisocyanates and polyphenylpolymethylene polyisocyanates having a reduced content of chlorinated by-products and a reduced iodine color number by two-stage reaction of the corresponding mixtures of diphenylmethanediamines and polyphenylpolymethylenepolyamines with phosgene in the presence of at least one inert organic solvent at elevated temperature, separation of the excess phosgene and solvent after the phosgenation is complete and thermal treatment of the reaction product, the mass ratios of phosgene to hydrogen chloride in the residence time apparatus of the second stage of the phosgenation are at the same time 10-30:1 in the liquid phase and 1-10:1 in the gas phase.

METHOD FOR PRODUCING MIXTURES CONSISTING OF DIPHENYLMETHANE DIISOCYANATES AND POLYPHENYLENE-POLYMETHYLENE-POLYISOCYANATES CONTAINING A REDUCED AMOUNT OF CHLORINATED SECONDARY PRODUCTS AND WITH A REDUCED IODINE COLOR INDEX

The present invention provides a liquid methylene bis(phenylisocyanate) composition including a high concentration of methylene bis(phenylisocyanate) which has an improved storage stability. The invention further provides a method of making the liquid methylene bis(phenylisocyanate) compositions of the present invention.

Storage stable methylene bis(phenylisocyanate) compositions

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St. Gillis-Waas, Belgium

Filip Nevejans