Basf Se Corporation

Basf Aktiengesellschaft

Dow Global Technolgoies LLC

Ströfer, Eckhard

Heiner Schelling

Eckhard Stroefer

Kai Thiele

Torsten Mattke

Gerhard Olbert

Joaquim Henrique Teles

Ulrich Mueller

Ulrike Wegerle

Daniel Urbanczyk

Otto Watzenberger

Christian Mueller

Michael Bock

Nicolai Tonio Woerz

Matthias Eiermann

Ulrich Penzel

Carsten Knoesche

Rolf Pinkos

Ulrich Müller

Jon S Speier

Andrei-Nicolae Parvulescu

Markus Weber

Dominic Riedel

Meinolf Weidenbach

Hans-Juergen Pallasch

Daniel Breuninger

Werner J Witzl

Marvin Kramp

Oliver Bey

Hans Hasse

Peter Pfab

Florian Garlichs

Gerd-Dieter Tebben

Andrea Haunert

Martin Sesing

Markus Siegert

Eckhard Ströfer

Byoung-Yeon Kim

Bernd Metzen

Michael Zoellinger

Vanessa Simone Lehr

Bernd Ziegler

Tobias Keller

Wolfgang Reichert

Patrick Deck

Oliver Huttenloch

Eckhard Str&ouml;fer

Hans-Michael Schneider

Jürgen Ciprian

Friedhelm Teich

Martin Gall

Markus Kraemer

Herbert K&ouml;ster

Horst Kratzer

Martin Karches

Olga Schubert

Filip Deberdt

Peter Van Den Abeel

Johannes Jacobs

Sergej Blagov

Carsten Knösche

Johannes Adam

Juergen Ciprian

Robert Reinhardt

Thomas A Grzanka

Karsten Luecke

Uwe Storck

Peter Mauer

Jochen Mannweiler

Timo Henn

Thomas Luederitz

Dirk Hablawetz

Dave Beckwith

William Portwood

Byoung Yeon Kim

Christian MÜLLER

Thomas LÜDERITZ

Nicolai Tonio WÖRZ

Disclosed is a process for purifying propylene oxide. A stream Scontaining propylene oxide, acetonitrile, water, and an organic compound containing one or more of acetone and propionaldehyde is provided. Propylene oxide is separated from Sby subjecting Sto distillation in a first distillation unit, obtaining a gaseous top stream Senriched in propylene oxide, a liquid bottom stream Senriched in acetonitrile and water, and a side stream Scontaining propylene oxide and enriched in the carbonyl compound; reacting the carbonyl compound in Swith an organic compound containing an amino group to obtain a reaction product; separating propylene oxide from the reaction product in a second distillation unit, obtaining a gaseous top stream Senriched in propylene oxide and a liquid bottoms stream Senriched in the reaction product; and introducing stream Sinto the first distillation unit.

Process for purifying propylene oxide

A continuous process for the preparation of propylene oxide, comprising a start-up stage and normal run stage, wherein the normal run stage comprises (i) continuously providing a liquid feed stream comprising propene, hydrogen peroxide, acetonitrile, a formate salt, water and optionally propane, wherein in the liquid feed stream, the molar amount of the formate salt relative to the molar amount of hydrogen peroxide at a given point of time during the normal run stage is a(Fo/HO); (ii) continuously passing the liquid feed stream provided in (i) into an epoxidation zone comprising a catalyst comprising a titanium zeolite having framework type MWW, and subjecting the liquid feed stream to epoxidation reaction conditions in the epoxidation zone, obtaining a reaction mixture comprising propylene oxide, acetonitrile, water, the formate salt, optionally propene, and optionally propane; (iii) continuously removing an effluent stream from the epoxidation zone, the effluent stream comprising propylene oxide, acetonitrile, water, at least a portion of the formate salt, optionally propene, and optionally propane; wherein the normal run stage is characterized in an average rate of change of a(Fo/HO) of less than 0 h.

Process for the preparation of propylene oxide

The present invention is related to a process for preparing propylene oxide, comprising (i) providing a stream comprising propene, hydrogen peroxide or a source of hydrogen peroxide, water, and an organic solvent; (ii) passing the liquid feed stream provided in (i) into an epoxidation zone comprising an epoxidation catalyst comprising a titanium zeolite, and subjecting the liquid feed stream to epoxidation reaction conditions in the epoxidation zone, obtaining a reaction mixture comprising propene, propylene oxide, water, and the organic solvent; (iii) removing an effluent stream from the epoxidation zone, the effluent stream comprising propylene oxide, water, organic solvent, and propene; (iv) separating propene from the effluent stream by distillation, comprising (iv.1) subjecting the effluent stream to distillation conditions in a distillation unit, obtaining a gaseous top stream Senriched in propene compared to the effluent stream subjected to distillation conditions, and a liquid bottoms stream Senriched in propylene oxide, water and organic solvent compared to the effluent stream subjected to distillation conditions; (iv.2) returning a condensed portion of the stream Sto an upper part of the distillation unit.

Process for preparing propylene oxide

The invention relates to a method of separating a phosgene- and hydrogen chloride-comprising stream (), wherein said method comprises conveying the hydrogen chloride- and phosgene-comprising stream () into a distillation column (), withdrawing at the bottom of the distillation column () a phosgene-comprising stream () and withdrawing at the top of the column an essentially hydrogen chloride-comprising stream (). At least a portion of the stream () withdrawn at the top is compressed and at least partially condensed and at least a portion of the liquid and compressed essentially hydrogen chloride-comprising stream is decompressed and recycled into the top of distillation column () as reflux.

Separation of a phosgene- and hydrogen chloride-comprising stream

The present invention relates to gas phase phosgenation of amines for preparation of isocyanates. In the present invention, phosgene is prepared by reacting chlorine with an excess of carbon monoxide in a gas phase. The obtained phosgene-containing reaction mixture is divided into two streams by a thermal and/or a membrane separating process. The first stream is a low-carbon monoxide stream of no more than 1% by weight of carbon monoxide, based on a total weight of the first stream. The second stream is a carbon monoxide-rich stream of more than 10% by weight of carbon monoxide, based on a total weight of the second stream. The first stream is used as the phosgene-containing reactant stream in the gas phase phosgenation of amines to prepare isocyanates. The second stream can be recycled into the phosgene synthesis.

Process for preparing isocyanates

A process for preparing phosgene by reaction of a feed stream () obtained by combining and mixing a chlorine feed stream () and a carbon monoxide feed stream (), with the carbon monoxide being introduced in a stoichiometric excess over chlorine, in catalyst tubes filled with beds of activated carbon in a reactor R having a bundle of catalyst tubes, to give a product gas mixture () which is separated into a liquid, phosgene-comprising product stream () and an offgas stream () comprising carbon monoxide which is discharged via a pressure-regulating valve, where the reaction of the feed stream () in the reactor R and the separation of the product gas mixture () are carried out under a pressure in the range fromtobar gauge pressure, wherein the excess of carbon monoxide in the feed stream () to the reactor R is regulated by continuously measuring the flow and the concentration of carbon monoxide in the offgas stream (), calculating the actual value of the excess of carbon monoxide in the feed stream () to the reactor R from these measurements in combination with the continuously measured values for the flow of the carbon monoxide feed stream () and the flow of and the chlorine concentration in the chlorine feed stream () and matching this to the intended value of the excess of carbon monoxide in the feed stream () to the reactor R by adapting the flow of the carbon monoxide feed stream (), is proposed.

Method for producing phosgene

The invention relates to a process for preparing methylenedi(phenyl isocyanate), which comprises (a) the phosgenation of two-ring and/or multiring methylenedi(phenylamine), (b) the fractionation of the crude methylenedi(phenyl isocyanate) obtained to give two-ring and multiring isomers, (c) the purification and/or fractionation of the resulting mixture of two-ring isomers of methylenedi(phenyl isocyanate) and (d) the storage of the mixtures obtained in step (c) or in step (b), wherein part of the stored mixtures is reused by means of recirculation in at least one of steps (b) or (c).

Process for preparing methylenedi(phenyl isocyanate)

The present invention relates to a process for preparing an isocyanate, comprising hydrogenating a mixture (Gi) comprising an amine in the presence of a hydrogenation catalyst comprising copper to obtain a mixture (Gii) comprising the amine, and reacting the mixture (Gii) with phosgene to obtain a mixture (Giii) comprising the isocyanate. The present invention further relates to the isocyanate preparable by this process.

Process for preparing an isocyanate

Processes for preparing 4-chlorobenzenesulfonic acid from 2-chlorobenzenesulfonic acid and/or 3-chlorobenzenesulfonic acid, which processes include the conversion of 2-chlorobenzenesulfonic acid and/or 3-chlorobenzenesulfonic acid to 4-chlorobenzenesulfonic acid in the presence of sulfuric acid at a temperature of 100 to 300&#xb0; C.; as well as processes for preparing 4,4'-dichlorodiphenyl sulfone, which include such described processes for preparing 4-chlorobenzenesulfonic acid.

Processes for preparing 4-chlorobenzenesulfonic acid and 4,4'-dichlorodiphenyl sulfone

The present invention accordingly provides a process for preparing light-colored polyphenylene-polymethylene polyisocyanates comprising the steps (a) providing an amount of chlorine, (b) separating the chlorine provided in the step (a) to obtain a first chlorine fraction having a content of free and bound bromine and iodine of &#x3c;50 ppm and a second chlorine fraction having an increased content of free and bound bromine and iodine that depends on the original amount of bromine and iodine in the chlorine provided in step (a) and the separation split, (c) reacting carbon monoxide with at least a portion of the first chlorine fraction to form a first phosgene fraction, (d) reacting carbon monoxide with at least a part of the second chlorine fraction to form a second phosgene fraction, (e) reacting at least a portion of a first phosgene fraction with at least one amine of the diphenylmethane diamine series (MDA) to form the corresponding polyphenylene-polymethylene polyisocyanate (PMDI), and (f) reacting at least a portion of the second phosgene fraction with at least one primary amine with the exception of mono- and polyphenylene-polymethylene polyamines to form an at least one isocyanate-containing reaction solution.

Process for the preparation of light-colored iocyanates of a diphenylmethanediisocyanate series

The present invention relates to a process for the production of isocyanates, preferably diisocyanates and polyisocyanates of the diphenylmethane series (MDI), by reacting an amine with phosgene in the liquid phase or in the gas phase to form the corresponding isocyanates, subsequent removal of the solvent in at least two steps to obtain at least two solvent streams, individual treatment of the at least two solvent streams, and recirculation of at least a portion of the solvent streams.

Process for the production of isocyanates, preferably diisocyanates and polyisocyanates with solvent recirculation

The present invention relates to a process for preparing light-colored polyphenylene-polymethylene-polyisocyanate (PMDI), comprising the steps (a) providing carbon monoxide and chlorine, (b) reacting carbon monoxide with chlorine to form phosgene, (c) reacting the phosgene from step (b) with at least one primary amine with the exception of mono- and polyphenylene-polymethylene polyamines with an excess of phosgene to form an at least one isocyanate containing reaction solution, and hydrogen chloride, (d) separating excess phosgene from the isocyanate-containing reaction solution obtained in step (c), (e) providing at least one polyphenylene-polymethylene polyamine, and (f) reacting at least a portion of the phosgene separated in step (d) with the at least one polyphenylene-polymethylene polyamine to form the light-colored polyphenylene-polymethylene polyisocyanate.

Process for preparing light-coloured isocyanates of the diphenylmethane series

A process for preparing diisocyanates by gas-phase phosgenation starting out from a feed stream comprising the corresponding diamines and a phosgene-comprising feed stream, in which the feed streams are separately converted into the gas phase and preheated to the reaction temperature of the gas-phase phosgenation, wherein the waste heat from a plant for preparing chlorine by heterogeneously catalyzed oxidation of hydrogen chloride by the Deacon process is utilized for this purpose, is proposed.

Method for producing diisocyanates by gas-phase phosgenation

The invention relates to a process for preparing methylenediphenyldiamine (MDA) by reacting formaldehyde and aniline in the presence of an acidic catalyst, wherein the oxygen content in the process for preparing MDA is &#x3c;10 000 ppm, based on all compounds present in the process. The invention further relates to the phosgenation of MDA to methylenediphenyl diisocyanate (MDI).

Method for producing color-stable MDA and MDI

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Kirchheim, Germany

Heiner Schelling