Covestro Deutschland Ag

Bayer Aktiengesellschaft

Bayer Intellectual Property Gmbh

Bayer Materialscience Ag

Alfred Soppe

Thorsten Leidig

Friedhelm Steffens

Knud Werner

Thomas Runowski

Jakob Rademachers

Peter Lehner

Fritz Rodi

Eric Jakobs

Helmut Janz

Juergen Bittner

Fritz Gestermann

Jürgen Kintrup

Klaus Geisler

Dieter Heitkamp

Bernd Bressel

Andre Rittermeier

Micky Qian

Jiyuan Sun

Rainer Hellmich

Jürgen Bittner

Luyan Wu

Henrike Fink

The present invention relates to a method and a system for separating and treating impurities from a hydrogen chloride liquid mixture from the process for preparing isocyanate with phosgenation including sending hydrogen chloride liquid mixture into a gas-liquid separation column for separation to yield a liquid phase flow with impurities at the bottom of the gas-liquid separation column, neutralizing the liquid phase flow comprising impurities with an alkaline liquid in the neutralization tank to yield a neutralized solution, and sending the neutralized solution into a waste liquid treatment device from said neutralization tank for treatment.

Method and a system for separating and treating impurities from a hydrogen chloride liquid mixture

The present invention relates to an apparatus and a method for evaporating liquids containing potentially explosive impurities of lower volatility than the actual liquid compound. The set-up of the evaporator according to the invention allows its operation with complete evaporation of a liquid without formation of a liquid sump of not yet evaporated liquid.

Apparatus and method for evaporating liquids containing potentially explosive impurities

The present invention relates to a process for purifying raw-material gases by fractionation. In particular, the present invention relates to a process for cleansing chlorine gas of bromine.

Process for purifying raw-material gases by fractionation

The invention relates to a process for the preparation of isocyanates in a system network comprising an isocyanate production plant, a chlorine production plant and a phosgene production plant, in which carbon dioxide formed as a by-product is partially to completely condensed out with the gaseous chlorine formed in the chlorine production plant and enters into the phosgene preparation process and, after the preparation of phosgene, the predominant part of the carbon dioxide formed is thereby sluiced out of the system network in gaseous form.

Process for the preparation of isocyanates

The invention relates to a method for recycling educt-containing process gas (residual gas) in electrochemical processes with at least one gas diffusion electrode while using a gas jet pump for directly reintroducing the residual gas in the electrochemical process.

Method of recycling process gas in electrochemical processes

The present invention relates to a method of increasing the concentration of dilute brine in NaCl electrolysis plants using the membrane process, wherein the NaCl required is stored in a mass flow silo with supernatant liquid and is fed continuously from there to the quick dissolver.

Method of increasing the concentration of dilute brine in NaCl electrolysis plants using the membrane process

In a rotary tubular kiln for carrying out gas-solids reactions, comprising an indirectly heated, rotatable reaction tube with inner baffles which is provided with charging and removing devices for solid and gas inlet and outlet lines, the improvement which comprises forming the baffles as a central tube which is sealed on both sides and runs along the total length of the kiln, and a spiral which is tightly connected to the central tube and also to the outer rotatable tube. Lifting blades are uniformly distributed along the inner periphery of the rotatable tube. The kiln is suitable for carrying out oxidation, reduction, chlorination, roasting, decomposition, catalytic, annealling and/or cooling processes, e.g. the conversion of hematite to magnetite or goethite to iron.

Indirectly heated rotary tubular kiln

In a rotary tubular kiln for carrying out gas-solids reactions, comprising an indirectly heated, rotatable reaction tube with inner baffles which is provided with charging and removing devices for solid and gas inlet and outlet lines, the improvement which comprises forming the baffles as a central tube which is sealed on both sides and runs along the total length of the kiln, and a spiral which is tightly connected to the central tube and also to the outer rotatable tube. Lifting blades are uniformly distributed along the inner periphery of the rotatable tube. The kiln is suitable for carrying out oxidation, reduction, chlorination, roasting, decomposition, catalytic, annealing and/or cooling processes, e.g. the conversion of hematite to magnetite or goethite to iron.

Use of novel rotary tubular kiln

Growing community of inventors

Issum, Germany

Alfred Soppe