Evonik Oxeno Gmbh & Co. Kg

Evonik Functional Solutions Gmbh

Evonik Operations Gmbh

Moritz Schröder

Armin Matthias Rix

Niklas Paul

Stephan Peitz

Philip Lutze

Tanita Valèrie Six

Sebastian Reimann

Philip Zitzewitz

Dirk Roettger

Manfred Neumann

Martin Oldemeyer

Andreas Oldenkott

Franz-Josef Stock

Marius Tiesbohnenkamp

Tanita Valérie Six

Johannes Ruwwe

A process for removing butenes from C4-hydrocarbon streams containing butanes and butenes involves extractive distillation with a suitable solvent. The process also involves heat integration, which allows utilization of the heat of the solvent for heating and/or at least partly evaporating various streams.

Process for removing butenes from C4-hydrocarbon streams and two-stage evaporation

Energy-efficient process for removing butenes from C4-hydrocarbon streams

A process produces sodium and/or potassium alkoxides in countercurrent by reactive rectification. Alcohol is reacted in countercurrent with the respective alkali metal hydroxide. The vapours containing alcohol and water are separated in at least two serially arranged rectification columns. The energy of the vapour obtained in the second rectification is utilized for operating the first rectification. This specific energy integration coupled with establishing a certain pressure difference in the two rectification stages makes it possible to cover a particularly large proportion of the energy required for the rectification through heating steam and minimizes the use of electricity.

Process for the energy-efficient production of alkali metal alkoxides

A method for separating butenes from C4 hydrocarbon streams containing butanes and butenes involves extractive distillation with a suitable solvent, and a subsequent adiabatic oligomerisation. The method also involves heat integration, which makes it possible to use the heat of the solvent in order to heat and/or at least partly evaporate various streams.

Method for separating butenes from C4 hydrocarbon streams, with subsequent oligomerisation

A method for separating butenes from C4 hydrocarbon streams containing butanes and butenes involves extractive distillation with a suitable solvent. The method also involves heat integration, which makes it possible to use the heat of the solvent in order to heat various streams.

Method for preventing three-phase separation of butenes from C4 hydrocarbon streams

Energy-efficient process for removing butenes from C4-hydrocarbon streams and subsequent n/iso separation

A process can be used for preparing sodium and potassium alkoxides. The process is characterized by two simultaneously implemented but spatially separated reactions of an alcohol ROH with NaOH, and ROH with KOH, to give sodium alkoxide and potassium alkoxide, respectively. The vapours formed in this case contain the alcohol used and water. The vapours are combined, and the resulting mixed vapour is fed to a common distillation with recovery of the alcohol.

Method for the simultaneous production of sodium and potassium alcoholates

A process produces sodium and/or potassium alkoxides in countercurrent by reactive rectification. Alcohol is reacted in countercurrent with the respective alkali metal hydroxide. The vapours containing alcohol and water are separated into at least two serially arranged rectification columns. The energy of the vapour obtained in the first rectification is utilized for operating the second rectification. This specific energy integration coupled with establishing a certain pressure difference in the two rectification stages makes it possible to cover a particularly large proportion of the energy required for the rectification through electricity and to save heating steam.

A method can be used for producing alkali metal alcoholates in counter flow by reactive rectification. The alkali metal is selected from sodium and potassium. In a first part of the method, the alcohol is converted in counter flow with the respective alkali metal hydroxide. In a second part of the method, the mixture of alcohol and water obtained is separated in a rectification column, and the alcoholic vapour arising is condensed, as a result of which the temperature thereof increases. The energy dissipated during cooling of the condensed vapour is then used in the first part of the method. This permits an energy-efficient production of the alkali metal alcoholates concerned.

Method for the energy-efficient production of sodium and potassium alcoholates

An extractive distillation column system contains a combination column and a side rectification column. A process can be used for separation of butenes from C4-hydrocarbon streams using the extractive distillation column system.

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Muenster, Germany

Moritz Schröder