Basf Aktiengesellschaft

Basf Se Corporation

Martin Fiene

Eckhard Stroefer

Klaus Harth

Christian Walsdorff

Eckhard Ströfer

Martin Sesing

Oliver Huttenloch

Wolfgang Siegel

Oskar Zelder

Gerhard Olbert

Klemens Massonne

Harald Rust

Markus Weber

Gerhard Schulz

Michael Bock

Stephan Freyer

Thorsten Johann

Christoph Adami

Jörg Heilek

Markus Siegert

Veit Stegmann

Neven Lang

Bernd Rumpf

Olga Schubert

Lothar Seidemann

Christian Müller

Filip Deberdt

Christian Kuhrs

Jan D Jacobs

Klaus; Harth

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

Process for preparing isocyanates

The invention relates to a process for purifying an ionic liquid, which comprises the steps (a) partial crystallization of the ionic liquid from its melt and (b) separation of the crystals from the residual melt.

Purification of ionic liquids

The present invention relates to a process for preparing pentamethylene 1,5-diisocyanate, to pentamethylene 1,5-diisocyanate prepared in this way and to the use thereof.

Process for preparing pentamethylene 1,5-diisocyanate

The invention relates to a method of operating a liquid ring compressor having an impeller installed eccentrically in a compressor body, with gas being supplied to the liquid ring compressor on a suction side and gas being discharged from the liquid ring compressor on a pressure side. A liquid ring is generated in the liquid ring compressor on the inside of the compressor body by rotation of the impeller. Chambers are formed between blades of the impeller and the liquid ring and gas is drawn into these. The gas is compressed in the chambers which become smaller from the suction side to the pressure side as a result of the rotation of the eccentrically mounted impeller. The compressed gas is ejected on the pressure side. An ionic liquid is used as service liquid for generation of the liquid ring.

Method for operating a liquid ring compressor

The invention relates to a reactor and a process for preparing chlorine from hydrogen chloride by gas-phase oxidation by means of oxygen in the presence of a heterogeneous catalyst in a fluidized bed, with gas-permeable plates being located in the fluidized bed. The gas-permeable plates are connected in a thermally conductive manner to a heat exchanger located in the fluidized bed.

Reactor and method for producing chlorine from HCl

A process for preparing formaldehyde by gas-phase oxidation of methanol vapor by means of a gas stream comprising molecular oxygen in the presence of a fixed-bed catalyst comprising iron and molybdenum, wherein the process is carried out in a reactor () having heat-exchange plates () which are arranged in the longitudinal direction of the reactor () and have a spacing between them and through which a heat transfer medium flows, inlet and outlet facilities () for the heat transfer medium to the heat-exchange plates () and also gaps () between heat-exchange plates () in which the fixed-bed catalyst is present and into which the methanol vapor and the gas stream comprising molecular oxygen are passed, is described.

Method for producing formaldehyde

A process for preparing chlorine by catalytic gas-phase oxidation of hydrogen chloride over a fixed catalyst bed is disclosed that includes: making available a feed gas stream I with hydrogen chloride and an oxygen-containing feed gas stream II, feeding the feed gas stream I, the feed gas stream II, and, if desired, a recycled stream Ia with hydrogen chloride, an oxygen-containing recycle stream IIa, and a recycled stream III into an oxidation zone and oxidizing hydrogen chloride to chlorine in the presence of a catalyst present in a fixed bed to give product gas stream IV having chlorine, unreacted oxygen, unreacted hydrogen chloride and water vapor, and taking the recycled stream III from the product gas stream IV, without further treatment, and recirculating it to the oxidation zone, leaving a product gas stream IVa.

Fixed-bed process for producing chlorine by catalytic gas-phase oxidation of hydrogen chloride

Process for preparing organic isocyanates, which comprises the steps

Integrated process for preparing isocyanates

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Niederkirchen, Germany

Martin Fiene