Oxeno Olefinchemie Gmbh

Huels Aktiengesellschaft

Chemische Werke Huls Aktiengesellschaft

Chemische Werke Huels Aktiengesellschaft

Evonik Oxeno Gmbh

Bernhard Scholz

Alfred Kaizik

Franz Nierlich

Wilfried Bueschken

Fritz Obenaus

Wilhelm Droste

Walter Toetsch

Martin Trocha

Dietmar Gubisch

Joachim Schuler

Wilfried B&uuml;schken

Joachim Neumeister

Dieter Hess

Klaus-Diether Wiese

Dirk Roettger

Andreas Beckmann

Wilfried Büschken

Dieter Reusch

Udo Peters

Jochen Praefke

Stefan Drees

Silvia Santiago Fernandez

Guido Protzmann

Gerhard Franz

Rudolf Nehring

Rainer Malzkorn

Thomas Wildt

Hans-Jurgen Erberich

Walter T&ouml;tsch

Richard Filipiak

Klaus Armbrust

Heinz-Otto Reitemeyer

Bernd Greving

Heinrich Balke

Otto Reitemeyer

Silvia Santiago-Fernandez

The invention relates to a process for preparing methyl tert-butyl ether (MTBE) in qualities which are suitable for organic syntheses and for use as a specialty solvent from MTBE in fuel quality.

Preparation of highly pure methyl tert-butyl ether

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

Olefins having from 5 to 24, in particular from 5 to 12, carbon atoms are hydroformylated by reacting an olefin or a mixture of olefins in the presence of an unmodified cobalt catalyst in a single-stage process in a reactor at a temperature of from 100&deg; C. to 220&deg; C. and a pressure of from 100 bar to 400 bar, to obtain an aldehyde, an alcohol or a mixture thereof. An aqueous bottom phase and an organic phase are present in the reactor, the aqueous bottom phase is mixed with the organic phase, and a concentration of the cobalt catalyst, calculated as metallic cobalt, in the aqueous bottom phase is in the range from 0.4 to 1.7% by mass based on the total weight of the aqueous bottom phase. A level of the aqueous bottom phase in the reactor is kept constant during steady-state operation.

Process for the hydroformylation of higher olefins using cobalt compounds as catalyst

Process for the hydrogenation of hydroformylation mixtures

Multistage process for the preparation of oxo aldehydes and/or alcohols

The invention relates to a process for preparing higher oxo alcohols from mixtures of isomeric olefins having from 5 to 24 carbon atoms by hydroformylation in the presence of a catalyst at elevated temperature and at elevated pressure, in which the hydroformylation is carried out in one stage, the olefin conversion rate for one pass is restricted to from 40 to 90% to produce a reaction mixture, and the reaction mixture is selectively hydrogenated.

Process for preparing higher oxo alcohols from olefin mixtures

A process for preparing higher oxo alcohols from mixtures of isomeric olefins having from 5 to 24 carbon atoms by two-stage hydroformylation in the presence of a cobalt catalyst or rhodium catalyst at elevated temperature and at elevated pressure, which comprises selectively hydrogenating the first hydroformylation stage reaction mixture, separating the hydrogenation mixture in a distillation into crude alcohol and low-boilers predominantly consisting of olefins, passing these low-boilers to the second hydroformylation stage, again selectively hydrogenating the second hydroformylation stage reaction mixture, separating the hydrogenation mixture in one distillation into crude alcohol and low-boilers, working up the crude alcohol by distillation to pure alcohol and taking off at least some of the low-boilers to discharge saturated hydrocarbons.

Process for preparing higher oxo alcohols from olefin mixtures by two-stage hydroformylation

A nickel-containing hydrogenation catalyst is prepared by reducing nickel-containing catalyst material in the liquid phase in a single-stage process by means of hydrogen.

Process for reducing oxidic hydrogenation catalysts

The invention relates to a process for the selective hydrogenation of reaction mixtures from the hydroformylation of C,to C,olefins using hydrogen and a supported catalyst which, as active components, comprises copper, nickel and chromium.

Process for the selective hydrogenation of hydroformylation mixtures

A single-stage process is described that includes simultaneously, in a mixture containing an olefin; synthesis gas; a cobalt catalyst in an organic phase; and an aqueous cobalt salt solution; hydroformylating the olefin, and forming and extracting into the organic phase the cobalt catalyst from the aqueous cobalt salt solution. An apparatus is also described that includes a means for carrying out the process. The process is particularly suitable for preparing aldehydes and alcohols.

Process for the production of higher oxo alcohols

A hydrocarbon containing sulfides, disulfides, trisulfides, tetrasulfides or mixtures can be desulfurized by contacting the hydrocarbon with a zeolite containing copper, silver, zinc or mixtures thereof.

Process for low level desulfurization of hydrocarbons

A process for the selective hydrogenation of hydrocarbons having three and more carbon atoms and several double bonds or with triple bonds in monoene-containing hydrocarbon mixtures is described. These compounds are selectively hydrogenated to monoenes in a practically quantitative fashion. Before beginning the hydrogenation, a small amount of carbon monoxide and once to twice the stoichiometric quantity of hydrogen are homogeneously dissolved in the hydrocarbon mixture. The mixture is hydrogenated as a homogeneous liquid phase on a fixed palladium catalyst under a moderately high pressure and at a moderately high temperature. No isomerization can be found in the monoenes and no side reactions or secondary reactions occur.

Process for the selective hydrogenation of polyunsaturated hydrocarbons

Tertiary-butanol in an aqueous solution containing from 40 to 90 percent by weight of tertiary butanol in homogeneous and liquid phase is dehydrated at a fixed catalytic bed consisting of a strongly acidic ion exchange resin at a temperature from 80.degree. to 150.degree. C. and at a pressure from 5 to 25 bars for the purpose of producing isobutene by dehydrating tertiary butanol. Thereupon the homogeneous, liquid reaction mixture is fractionated in a distillation sector separate from the reaction chamber, the isobutene being separated from the water and from the unreacted tertiary butanol. The unreacted tertiary butanol is returned as an aqueous solution in a circulating flow rate to the reactor under the conditions that the mixture of fresh-fed tertiary butanol and the circulating tertiary-butanol/water mix contains from 40 to 90 percent by weight of tertiary butanol at the reactor inlet.

Process for producing high purity isobutene by dehydrating tertiary

In an improved process for the production of carboxylic acid esters by catalytic oxidation of alcohols in the liquid phase, primary alcohols of 1-4 carbon atoms are oxidized with molecular oxygen at temperatures of about 100.degree.-250.degree. C. in the presence of catalytic amounts of a compound of Co, Mn, Cr, or Fe, and an acid having a first dissociation constant K.sub.1 greater than 10.sup.-3, dissolved in the reaction mixture.

Process for the production of carboxylic acid esters by catalytic

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Marl, Germany

Bernhard Scholz