Covestro Deutschland Ag

Christian Drumm

Thomas Knauf

Friedhelm Steffens

Dorota Greszta-Franz

Alexandre Racoes

Reiner Witkowski

Jan Morbach

Murat Kalem

Dieter Hoffmann

The invention relates to a continuously operating process for producing nitrobenzene, comprising the following steps: a) nitriding benzene in adiabatic conditions with sulfuric acid and nitric acid, using a stoichiometric excess of benzene in relation to the nitric acid; b) first separating a gaseous phase containing benzene and gaseous secondary components from the raw process product of the nitridation in a gas separator provided specifically for this purpose, then separating, in a downstream phase-separating apparatus, the resulting liquid phase, which is depleted in gaseous components and contains nitrobenzene and sulfuric acid, into a sulfuric acid phase and a nitrobenzene phase; and c) processing the nitrobenzene phase, obtaining nitrobenzene. The invention also relates to a production plant suitable for carrying out the claimed process.

Process for the continuous production of nitrobenzene

The present invention relates to a method for purifying polyaspartic acid ester compositions and to the provision of polyaspartic acid ester compositions that contain 0.01 to &#x3c;2% by weight fumaric acid dialkyl esters.

Polyaspartic acid ester compositions and method for purification

The present invention relates to a distributor device () for the even distribution of a fluid () into 2 or more fluid streams each containing gas () and liquid (), with a falling film evaporator (), in which the distributor device according to the invention serves to distribute the 2 or more fluid streams onto the heating pipes of the evaporator, and to the use of the distributor device () according to the invention and in particular the falling film evaporator () according to the invention in the production and/or preparation of chemical products. The distributor device according to the invention is characterized, in particular, by a swirl breaker () for the gas phase () which arises from separating the fluid () into a gas phase () and a liquid phase () within the distributor device.

Distributor device, in particular for falling film evaporators, and use thereof

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Frohnhofen, Germany

Christian Drumm