Oxeno Olefinchemie Gmbh

Oxeno Olefinshemie Gmbh

Evonik Degussa Gmbh

Evonik Oxeno Gmbh

Dieter Reusch

Andreas Beckmann

Franz Nierlich

Wilfried Bueschken

Axel Tuchlenski

Alfred Kaizik

Dirk Roettger

Gerda Grund

Franz-Felix Kuppinger

Bernhard Scholz

Wilfried Büschken

Udo Peters

Jochen Praefke

Silvia Santiago Fernandez

Dirk Röttger

Michael Sakuth

Andreas Beckman

Silvia Santiago-Fernandez

The invention relates to a process for preparing butene oligomers and tert-butyl ethers from Chydrocarbon streams, by converting the isobutene to butene oligomers and tert-butyl ethers and removing them from the Cstreams.

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Isobutene is prepared by dissociating tert-butanol into isobutene and water over an acid ion-exchange resin arranged as a fixed bed in at least one reactor at a temperature of from 80 to 150&#xb0; C. and at a pressure of from 5 to 25 bar to obtain a reaction mixture, separating the reaction mixture into isobutene, a by-product, water and at least one mixture of undissociated tert-butanol and water. The reactor is operated pseudo-isothermally, with a temperature difference between inflowing and outflowing streams of less than 15 K.

Process for preparing isobutene from tert-butanol

The invention relates to a process for preparing tert-butanol by reaction of a homogeneous mixture comprising water, tert-butanol and an isobutene-containing hydrocarbon mixture over an acidic ion-exchange resin at from 30 to 120&#xb0; C., wherein the homogeneous mixture contains, at a proportion by mass of isobutene of above 10%, from 30 to 80% of the maximum amount of water made possible by the solubility of water in the mixture of tert-butanol and the isobutene-containing hydrocarbon mixture.

Process for preparing tert-butanol

The present invention relates to a process for separating 2-butanol from tert-butanol/water mixtures using a membrane to reduce a water concentration to less than the limit concentration of the distillation boundary line connecting the two azeotropes TBA/water and SBA/water and is subsequently worked up by distillation.

Process for separating 2-butanol from tert-butanol/water mixtures

The present invention relates to a process for separating 2-butanol from tert-butanol/water by adding of tert-butanol such that the water concentration lowers to less than the limit concentration of the distillation boundary line connecting the two azeotropes TBA/water and SBA/water and is subsequently worked up by distillation.

The invention relates to a process for separating 2-butanol from an industrial mixture which includes 2-butanol, tert-butanol and water by separating water from the industrial mixture by distillation to obtain a distillate, wherein the distillate has, in terms of the 2-butanol, tert-butanol and water in the industrial mixture, a proportion by mass of water, which at a pressure, is greater than the limit concentration of the distillation boundary line connecting an azeotrope of tert-butanol and water; and an azeotrope of 2-butanol and water; subsequently changing the pressure so that the mixture has, in terms of the 2-butanol, tert-butanol and water in the distillate, a proportion by mass of water which is less than the limit concentration of the distillation boundary line connecting the distillation boundary line connecting an azeotrope of tert-butanol and water; and an azeotrope of 2-butanol and water; and subsequently distilling the mixture at the same pressure into a stream comprising 2-butanol and a stream comprising tert-butanol and water.

Process for removing 2-butanol from tert-butanol/water mixtures

The invention relates to a process for preparing tert-butanol (TBA) from isobutene-containing mixtures, in which at least part of the conversion is achieved with the aid of a reactive rectification.

Method for producing tert-butanol by means of reactive rectification

The invention relates to a process for preparing tert-butanol (TBA) by reacting isobutene-containing hydrocarbon mixtures with water over acidic solid catalysts in a plurality of reactors, wherein the conversion is increased upstream of the last reactor by removing a portion of the TBA present in the reaction mixture.

Obtaining tert-butanol

Alkyl tert-alkyl ethers are cleaved into the corresponding isoolefins and alkanols by a process comprising acid-catalyzed reactive distilling an alkyl tert-alkyl ether fed into the reaction zone of a reactive distillation apparatus as an azeotrope of the alkyl tert-alkyl ether and the corresponding alkanol, wherein the reactive distillation apparatus is configured from bottom to top as a bottom zone, at least one distillation zone and a reaction zone. The process is suitable for the cleavage of primary, secondary and tertiary alkyl tert-alkyl ethers, in particular MTBE.

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Marl, Germany

Dieter Reusch