Basf Se Corporation

Gerrit Waters

Hans-Guenter Wagner

Thomas Roussiere

Suman Thotla

Torsten Mattke

Randolf Hugo

Andreas Raichle

Peter Renze

Julia Leschinski

Johannes Buettner

Ruediger Fritz

Ekkehard Schwab

Eckhard Stroefer

Thomas Heidemann

Matthias Kroner

Horst Binder

Oliver Bey

Maximilian Vicari

Thomas Ostrowski

Goetz-Peter Schindler

Holger Friedrich

Grigorios Kolios

Harald Schaefer

Andreas Woelfert

Andreas Brodhagen

Ingolf Hennig

Kai Rainer Ehrhardt

Heinrich Laib

Dirk Grossschmidt

Dirk Meckelnburg

Florina Corina Patcas

Andreas Weickgenannt

Lucia Koenigsmann

Eric Jenne

Piotr Makarczyk

Michael Lorenz

Markus Neudert

Michael Huebner

Holgar Braunsberg

Markus Hiller

Helmut Rueger

Burkhard Hantel

Arndt Hofmann

Kathrin Richter

Lothar Bruntsch

Michael Herrich

Vinit Chilekar

Alexander Bayer

Alexandra Seeber

Fatemeh Ahmadnian

Ronald Adelmann

Rüdiger Fritz

Wolfgang Gmeiner

Randolph Hugo

Christoph Grossmann

Achim Loffler

Fatemeh Admadnian

Ralf Bohling

Ulrich Kammel

Milind Joshi

Johannes Büttner

Steffen Wagloehner

Achim Löffler

Andreas WÖLFERT

Helmut RÜGER

Ralf BÖHLING

Christoph GROßMANN

Marcus Reble

The invention relates to a process for obtaining isobutene from an isobutene containing C4-hydrocarbon mixture () in a plant comprising an etherification unit (), a first distillation unit (), an ether cleavage unit () and a second distillation unit (), the process comprising: (a) contacting the C4-hydrocarbon mixture () with a primary alcohol () and reacting the mixture with the primary alcohol in the presence of an acidic catalyst to form the corresponding alkyl tert-butyl ether in the etherification unit (); (b) distilling the reaction mixture () from the etherification unit () in the first distillation unit (), a C4-hydrocarbon raffinate being withdrawn as the overhead product (), and the alkyl tert-butyl ether being withdrawn as the bottom product (); (c) vaporizing the bottom product from the first distillation unit () in an evaporator () obtaining a vapor stream (); (d) reacting the vapor stream () of step (c) in the presence of an acidic catalyst obtaining isobutene and the primary alcohol as reaction products in the ether cleavage unit (); (e) distilling the reaction mixture () from the ether cleavage unit () in the second distillation unit (), isobutene being withdrawn as the overhead product (), the primary alcohol and diisobutene being withdrawn as the bottom product () and being recycled to the etherification unit (); wherein a purge stream () containing high boiling components with a normal boiling point higher than that of the alkyl tert-butyl ether is withdrawn from the evaporator () in step (c).

Process for obtaining isobutene from a C4-hydrocarbon mixture

The invention relates to a process for obtaining isobutene from an isobutene containing C4-hydrocarbon mixture () in a plant comprising an etherification unit (), a first distillation unit (), an ether cleavage unit () and a second distillation unit (), the process comprising: (a) contacting the C4-hydrocarbon mixture () with a primary alcohol () and reacting the mixture with the primary alcohol in the presence of an acidic catalyst to form the corresponding alkyl tert-butyl ether as an intermediate product and diisobutene as a by-product in the etherification unit (); (b) distilling the reaction mixture () from the etherification unit () in the first distillation unit (), a C4-hydrocarbon raffinate being withdrawn as the overhead product (), the alkyl tert-butyl ether and diisobutene being withdrawn as the liquid or vaporous bottom product (), and vaporizing the bottom product () if it is withdrawn as a liquid; (c) reacting the vaporous bottom product () in the presence of an acidic catalyst obtaining isobutene and the primary alcohol as reaction products in the ether cleavage unit (); (d) distilling the reaction mixture () from the ether cleavage unit () in the second distillation unit (), isobutene being withdrawn as the overhead product (), the primary alcohol and diisobutene being withdrawn as the bottom product () and being recycled to the etherification unit (); the plant further comprising a byproduct separation unit () being fed by a bottom purge stream () of the first distillation unit () and/or by a part of the bottom product of the second distillation unit (), this feed stream () being split up in at least three byproduct streams wherein a first byproduct stream () is rich in diisobutene, a second byproduct stream () is rich in the primary alcohol, and a third byproduct stream () is rich in components with a normal boiling point higher than 110° C.

The invention relates to a process for obtaining isobutene from an isobutene containing C4-hydrocarbon mixture () in a plant comprising an etherification unit (), a first distillation unit (), an ether cleavage unit () and a second distillation unit (), the process comprising: (a) contacting the C4-hydrocarbon mixture () with a primary alcohol () and reacting the mixture with the primary alcohol in the presence of an acidic catalyst to form the corresponding alkyl tert-butyl ether as an intermediate product and diisobutene as a by-product in the etherification unit (): (b) distilling the reaction mixture () from the etherification unit () in the first distillation unit (), a C4-hydrocarbon raffinate being withdrawn as the overhead product (), the alkyl tert-butyl ether and diisobutene being withdrawn as the liquid or vaporous bottom product (), and vaporizing the bottom product () if it is withdrawn as a liquid: (c) reacting the vaporous bottom product () in the presence of an acidic catalyst obtaining isobutene and the primary alcohol as reaction products in the ether cleavage unit (): (d) distilling the reaction mixture () from the ether cleavage unit () in the second distillation unit (), isobutene being withdrawn as the overhead product (), the primary alcohol and diisobutene being withdrawn as the bottom product () and being recycled to the etherification unit (); the plant further comprising a byproduct separation unit () being fed by a bottom purge stream () of the first distillation unit () and/or by a part of the bottom product of the second distillation unit (), wherein a diisobutene product stream rich in diisobutene is separated from this feed stream ().

The invention relates to a process for starting up a plant for removing isobutene from an isobutene-containing C4-hydrocarbon mixture, the plant comprising an etherification unit containing moist acidic ion exchange resin, a first distillation unit, an ether cleavage unit, and a second distillation unit. The invention further relates to a process for shutting down the plant from a stationary operation mode.

Process for starting up and shutting down a plant for removing isobutene from a C4-hydrocarbon mixture

A method for detecting deposits in a pipe system of an apparatus is proposed, the apparatus being flowed through by a fluid. In the method it is provided that at least one microwave probe is introduced into the pipe system in such a way that the fluid flows against a window () of the microwave probe that is transparent to microwave radiation, and that microwaves are coupled into the pipe system by way of at least one microwave probe, wherein a reflection measurement is carried out with one or two microwave probes, and/or at least two microwave probes are introduced into the pipe system at a distance from one another and a transmission measurement is carried out, wherein a comparison of measurement data with a reference or a previous measurement is used to deduce a constriction in the pipe system segment and the free cross-section at the constriction is determined, the detection of a constriction being used to deduce the presence of deposits. Further aspects of the invention relate to a microwave probe for coupling microwave radiation into the pipe system of an apparatus and to a measuring device for carrying out the method that comprises at least one such microwave probe.

Method and apparatus for detecting deposits in a pipe system of an apparatus

The invention relates to a process for preparing aromatic amines by hydrogenation of corresponding nitroaromatics by means of hydrogen, and also an apparatus suitable for this purpose. In particular, the invention relates to a process for preparing toluenediamine (TDA) by hydrogenation of dinitrotoluene (DNT).

Optimized introduction of the starting materials for a process for preparing aromatic amines by hydrogenation of nitroaromatics

A process for a continuous production of a polyetherol first involves reacting a catalyst () with an alcohol starter () or an alkoxylated precursor, to give a mixture comprising an alcoholate and water. Water is then removed from the mixture. The process further involves feeding the alcoholate into a bubble column and feeding an alkylene oxide into the bottom of a compartment of the bubble column, such that the alkylene oxide rises in the alcoholate. The alkylene oxide then reacts with the alcoholate or a secondary product from the reaction between the alcoholate and alkylene oxide, to give the polyetherol.

Process for a continuous production of polyetherols

The invention relates to a process for preparing isocyanates and/or polyisocyanates by reacting the corresponding amines with phosgene, optionally in the presence of an inert medium, in a reactor (), a first reactant stream comprising the amine being supplied to the reactor () in liquid form, and a second reactant stream comprising the phosgene being supplied to the reactor in gaseous form. The reactor is a centrifugal reactor () having a packing () which rotates about a central axis () in a housing (), the first reactant stream and the second reactant stream being supplied to the rotating packing () such that the reactant streams are mixed due to the centrifugal force in the rotating packing () and are transported outward, the mixing in the rotating packing () resulting in reaction of the phosgene with the amine to give the corresponding isocyanate or polyisocyanate.

Process for preparing isocyanates and/or polyisocyanates

The present invention relates to a reactor for the photocatalytic treatment of liquid or gaseous streams, which reactor comprises a tube through which the stream to be treated flows, wherein, in the tube, there are arranged at least one light source, at least one flat means Mprovided with at least one photocatalytically active material and at least one flat means Mreflecting the light radiation radiated by the at least one light source, wherein the reflecting surface of the at least one means Mand the inner wall of the tube are at an angle greater than or equal to 0&#xb0;, in such a manner that the light exiting from the light source is reflected by the at least one means Monto the photocatalytically active material, and to a method for the photocatalytic treatment of liquid or gaseous streams by irradiation with light in the reactor according to the invention.

Photoreactor

The present invention relates to a process for preparing polyisocyanates comprising biuret groups from diisocyanates or polyisocyanates and diamines.

Process for preparing polyisocyanates comprising biuret groups

In the process for hydrogenating butadiyne over a catalyst which comprises at least one platinum group metal on an inorganic metal oxide as a support, the hydrogenation is performed at a pressure in the range from 1 to 40 bar and a temperature in the range from 0 to 100&#xb0; C., and from 0.05 to 5% by weight, based on the overall catalyst, of platinum group metal is present on the support.

Process for hydrogenating butadiyne

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Karlsruhe, Germany

Gerrit Waters