Huels Aktiengesellschaft

Huls Aktiengesellschaft

Degussa Aktiengesellschaft

Phenolchemie Gmbh & Co. Kg

Ineos Phenol & Gmbh Co., Kg

Huls Aktiengesellschaft, Werk Troisdorf

Hermann-Josef Korte

Anton Schoengen

Christoph Schwarz

Uwe Tanger

Hartwig Rauleder

Markus Weber

Rudolf Modic

Thomas Jostmann

Ralf Wirges

Johann H Schroeder

Jochen Ullrich

Anton Miletic

Hans U Neutzler

Johann-Heinrich Schroeder

Hans-Guenther Srebny

Frank Kropfgans

Franz-Michael Bollenrath

Gerhard Franz

Stefan Bade

Uwe Schoen

Bernhard Piotrowski

Jorg Porschen

Frank Steding

J Org Porschen

Stefan Jelko

John Burkhard

Norbert Hofmann

Process and apparatus for the work-up by distillation of cleavage product mixtures produced in the cleavage of alkylaryl hydroperoxides

Phenol is separated from a mixture containing hydroxyacetone, cumene, water and phenol, by fractionating the mixture in a process with a fractional distillation step and a phase separation step to provide a single phenol fraction containing less than 300 ppm of hydroxyacetone. In the work-up by distillation of cleavage product mixtures, the hydroxyacetone can be removed from the cleavage product mixture together with a phenol fraction from which the hydroxyacetone has to be removed. A process can be used for purifying cleavage product mixtures obtained in the cleavage of alkylaryl hydroperoxides such as cumene hydroperoxide. The process allows separation of phenol and acetone from mixtures obtained in the cleavage of cumene hydroperoxide.

Process for separating phenol from a mixture comprising at least hydroxyacetone, cumene, water and phenol

Manufacturing process for aminoalkyl silanes

Process for the continuous preparation of 3-halopropylorganosilanes

Process for the purification of an oxidation off gas

A process is provided for the oxidation of p-xylene and methyl p-tolulate with oxygen-containing gases in the Witten-Hercules process for preparing dimetyl terephthalate in at least two sequentially arranged stages and in the presence of a catalyst, wherein the process involves oxidizing p-xylene and methyl p-toluate with oxygen containing gases in at least two sequential stages in the presence of a catalyst, wherein the at least two sequential stages include at least one p-xylene rich stage and at least one methyl p-toluate rich stage, wherein at least one of the following steps (a) and (b) occurs:

Oxidation in the Witten-Hercules process for preparing dimethyl

A process for the preparation of terephthalic acid (TA) from pure dimethyl terephthalate (DMT) and/or DMT intermediate product by hydrolysis in a countercurrent reactor at a conversion of greater than 99% and crystallization to give the solid product, characterized in that the sum of the stripping steam (S) and reaction water (W) satisfies the relationship

Process for the preparation of terephthalic acid and its isomers

In the purification of an off-gas stream originating from a process of oxidizing a liquid mixture of para-xylene with methyl para-toluate with an oxygen-containing gas under pressure, the off-gas being contaminated with at least one of an aliphatic and an aromatic impurity, which comprises expanding the off-gas stream in an expansion turbine for generating mechanical or electrical energy so as to obtain an at least partial recovery of the energy contained in the off-gas, the improvement comprising subjecting the off-gas to at least one absorption step under pressure to remove at least one component from the off-gas and subjecting the resultant off-gas stream to combustion under a pressure of more than 3 bar prior to expanding the off-gas stream in the expansion turbine.

Process for the purification of an oxidation off gas with energy recovery

The invention relates to a process for the production of a DMT intermediate product as well as its working up to fibregrade DMT and to medium pure and pure terephthalic acid. The DMT intermediate product is moreover produced by combined oxidation of a predominantly para-xylene (p-X) and para-toluic acid methyl ester (p-TE) containing mixture in liquid phase with an oxygen containing gas, esterification of the acids being produced with methanol, distillative or rectificative separation of the esterification products being produced into a p-TE rich fraction I, a fraction II containing more than 99% by weight DMT and its isomers and a high boiling residue fraction III as well as feeding back the p-TE fraction I into the oxidation, with the residue fraction III having a DMT content of 15 to 70% by weight and the DMT fraction II being purified by single solvent recrystallisation in methanol to form the DMT intermediate product to such an extent that the amounts of hydroxymethylbenzoic acid methyl ester (HM-BME) and terephthalic acid methyl ester (TAE) in the DMT intermediate product amount together to less than 200 ppm.

Process for the production of DMT-intermediate product of specific

Process for the production of DMT-intermediate product of specific purity

A reactor for carrying out heterogeneous-phase reactions, in particular gas/liquid reactions with a continuous liquid phase and a dispersed (discontinuous) gas phase, is described, in which, in a horizontal plane, a substantially vertically upward-directed flow of the reaction medium takes place in a first region of the reactor cross-section and a substantially vertically downward-directed flow takes place in another region of the reactor having a device for dispersing the discontinuous phase such as a dispersing screen, substantially only in the regions with upward-directed flow. The reactor is here designed in such a way that free flow of the reaction medium from regions with downward-directed flow to regions with upward-directed flow is possible in the region of the dispersing device. The preferred use of the proposed reactor is the exothermic oxidation of p-xylene and monomethyl p-toluate with air in the so-called Witten DMT process.

Reactor for heterogeneous-phase reactions

Growing community of inventors

Haltern, Germany

Hermann-Josef Korte