Basf Se Corporation

Basf Aktiengesellschaft

Josef Meissner Gmbh & Co. Kg

Shanghai Basf Polyurethane Company Limited

Samuel Neto

Frank Rosowski

Sebastian Storck

Jürgen Zühlke

Julia Leschinski

Andreas Raichle

Ulrich Penzel

Sebastian Ahrens

Renate Hempel

Joana Coelho Tsou

Barbara Becker

Steffen Oehlenschlaeger

Johannes Buettner

Holgar Braunsberg

Stefanie Haase

Leo Denissen

Bart Van De Voorde

Mirko Haendel

Ekkehard Schwab

Hartmut Hibst

Hartwig Voss

Stefan Maixner

Wolfgang Mackenroth

Petr Kubanek

Heinrich Hermann

Steffen Oehlenschläger

Holger Allardt

Filip Deberdt

Petra Deckert

Jürgen Pöhlmann

Stefan Bauer

Michael Zoellinger

Ruediger Fritz

Da Peng Li

Koenraad Vandewalle

Karen Vercruysse

Rüdiger Fritz

Yuan Shen Dai

Michael Reiser

Wolfgang Rummel

Frederik Van Laar

Yuanshen Dai

Sven Boehmeke

Johannes Büttner

Matthias Fankhaenel

Stefan Robert Deibel

Hendrik De Winne

Juergen Poehlmann

Zhan Cai

Pei Shi Jia

Henrich Hermann

Hartwig Voß

Sven Böhmeke

Process for scrubbing a crude mixture which is obtained in the nitration of toluene after separating off the nitrating acid and comprises dinitrotoluene, nitric acid, nitrogen oxides and sulfuric acid, which comprises two scrubbing steps (WS-I) and (WS-II), wherein i) in a first scrubbing step (WS-I), the crude mixture is extracted with a scrubbing acid I comprising nitric acid, nitrogen oxides and sulfuric acid in a scrub comprising at least one extraction stage, where the scrubbing acid discharged from the first extraction stage (WS-I-1) of the first scrubbing step (WS-I) has a total acid content of from 10 to 40% by weight and a content of from 80 to 350 ppm of hydrocyanic acid, giving a prescrubbed crude mixture, ii) in a second scrubbing step (WS-II), the prescrubbed crude mixture comprising dinitrotoluene is extracted with a scrubbing acid II in a scrub comprising at least one, preferably at least 2, extraction stage(s), where the scrubbing acid discharged from the first extraction stage (WS-II-1) of the second scrubbing step (WS-II) has a pH of less than or equal to 4, giving a dinitrotoluene-comprising mixture which is essentially free of nitric acid, sulfuric acid, nitrogen oxides and hydrocyanic acid and has a content of not more than 300 ppm of nitric acid and nitrogen oxides, not more than 3 ppm of sulfate and not more than 50 ppm of hydrocyanic acid.

Process for acidic scrubbing of dinitrotoluene in the presence of hydrocyanic acid

Proposed is a separation method in a toluene to dinitrotoluene process, wherein said method with a first process step comprising feeding a toluene comprising first stream () and a nitric acid comprising second stream () into a first reactor (R), reacting of the toluene comprising first stream () and the nitric acid comprising second stream () within the first reactor (R) to a first reaction mixture (), said first reaction mixture () comprising a first liquid/liquid mixed phase of an acid phase and an organic phase comprising mononitrotoluene, feeding the first reaction mixture () into a first separation device (S), separating the first reaction mixture () within the first separation device (S) into a first forward stream () having a flow direction to a second process step and a first backward stream () having a flow direction back to the first reactor (R), said method having a second process step comprising feeding the first forward stream () into a second reactor (R), feeding a nitric acid comprising third stream () and a sulfuric acid comprising fourth stream () into the second reactor (R), reacting of the first forward stream (), the nitric acid comprising third stream () and the sulfuric acid comprising fourth stream () within the second reactor (R) to a second reaction mixture (), said second reaction mixture () comprising a second liquid/liquid mixed acid phase and an organic phase comprising mononitrotoluene and dinitrotoluene, feeding the second reaction mixture () into a second separation device (S), separating the second reaction mixture () within the second separation device (S) into a second forward stream () having a flow direction to a process output and a second backward stream () having a flow direction back to the first reactor (R), wherein fine separating of at least one of the streams () after the first separation step (S) and/or the second separation step (S) in a coalescer is carried out.

Separation method for dinitrotoluene and mixed acid in a toluene to dinitrotoluene process

The invention relates to a process for scrubbing a crude mixture comprising dinitrotoluene, nitric acid, nitrogen oxides and sulfuric acid obtained in the nitration of toluene after the nitrating acid has been separated off, which comprises two scrubbing steps (SS-I) and (SS-II), wherein

Process for scrubbing dinitrotoluene

A process for obtaining pure aniline contains

Process for obtaining pure aniline

The present invention relates to a continuous process for preparing at least one aromatic amine by hydrogenation of at least one nitroaromatic by means of hydrogen, where a liquid phase comprising at least the aromatic amine and a gas phase comprising at least hydrogen are present, in the presence of a catalyst suspended in the liquid phase at a temperature of from 50 to 250&#xb0; C. and a pressure of from 5 to 50 bar, wherein the pressure in the reactor is kept essentially constant by continuous adaptation of the amount of hydrogen fed to the reactor, the total amount of hydrogen fed to the reactor is monitored and the introduction of the at least one nitroaromatic is interrupted if the hydrogen uptake in the reactor is not at least 50 mol % of the amount of hydrogen required for stoichiometric reaction of the at least one nitroaromatic to form the at least one aromatic amine.

Monitoring of the stoichiometric ratio in the reaction of nitroaromatics with hydrogen

The invention relates to a process for purifying crude aromatic nitro compounds which originate from the nitration of aromatic compounds, comprising the single or multiple performance of the following wash stage (a):

Process for purifying wastewaters from the workup of crude aromatic nitro compounds

A process for preparing tolylenediamine by hydrogenating dinitrotoluene with hydrogen in the presence of a suspended catalyst

Method for producing toluylenediamine by hydrogenating dinitrotoluene

The invention relates to a process for the continuous preparation of toluenediamine by liquid-phase hydrogenation of dinitrotoluene by means of hydrogen in the presence of a suspended, nickel-comprising catalyst in a reactor with a product isolation unit downstream of the reactor to give a product output from the reactor comprising a liquid phase comprising toluenediamine and dinitrotoluene, in which the nickel-comprising catalyst is suspended, wherein the concentration of dinitrotoluene in the liquid phase of the product output from the reactor in the region between the reactor and the downstream product isolation unit is set to a value in the range from 1 to 200 ppm by weight, based on the total weight of the liquid phase of the product output from the reactor.

Process for preparing toluenediamine by hydrogenation of dinitrotoluene

Catalyst systems for preparing phthalic anhydride by means of gas-phase oxidation of o-xylene and/or naphthalene, and a process for preparing phthalic anhydride using the catalyst systems.

Three-layered, four-layered, or five-layered catalyst systems for producing phthalic anhydride

Catalytic titanium dioxide mixtures comprising: a first anatase titanium dioxide having a BET surface area greater than 15 m/g and a hydrogen uptake for the reduction of Tito Tiof from 5 to 20 &#x3bc;mol/m; and a second anatase titanium dioxide having a BET surface area less than or equal to 15 m/g and a hydrogen uptake for the reduction of Tito Tiof from 0.6 to 7 &#x3bc;mol/m, processes for preparing catalysts containing the same, catalysts containing active compositions including such titanium dioxide mixtures on support materials, and catalyst systems using the same.

Catalytic titanium dioxide mixtures, catalysts and catalyst systems containing the same, processes for making the same, and uses therefor

Three-layered or four-layered catalyst systems for producing phthalic anhydride

A process is described for producing a catalyst for gas-phase oxidations, in which a suspension of TiOand VOparticles is applied to a fluidized inert support, wherein at least 90% by volume of the VOparticles have a diameter of 20 &#x3bc;m or less and at least 95% by volume of the VOparticles have a diameter of 30 &#x3bc;m or less. The defined particle size distribution of the VOallows a high coating efficiency.

Gas phase oxidation catalyst with defined vanadium oxide particle size distribution

A multimetal oxide of the formula I,AgQMVO*e HO,&#x2003;&#x2003;Iwhere a is from 0.3 to 1.9, Q is an element selected from among P, As, Sb and/or Bi, is from 0 to 0.3, M is a metal selected from among Nb, Ce, W, Mn, Ta, Pd, Pt, Ru and/or Rh, c is from 0.001 to 0.5, with the proviso that (a-c)&#x2267;0.1, d is a number which is determined by the valence and abundance of the elements other than oxygen in the formula I and e is from 0 to 20, and also precatalysts and catalysts produced therefrom for the partial oxidation of aromatic hydrocarbons are described.

Multimetal oxide containing silver, vanadium and a promoter metal and use thereof

The invention relates to a process for preparing phthalic anhydride, in which the catalytic gas-phase oxidation of o-xylene and/or naphthalene is carried out over at least three zones of catalysts of increasing activity, with only the last zone of the catalyst system containing phosphorus and the last zone also comprising at least 10% by weight of vanadium (calculated as VO) based on the active composition of the catalyst and having a ratio of vanadium (calculated as VO) to phosphorus of greater than 35.

Method for producing phthalic anhydride

A description is given of a process for preparing aldehydes, carboxylic acids and/or carboxylic anhydrides, in particular phthalic anhydride, in which a gaseous stream comprising an aromatic hydrocarbon and molecular oxygen is passed at elevated temperature over a bed of a first catalyst and a bed which is made up of a second catalyst having a higher activity than the first catalyst and is located downstream of the first catalyst in the flow direction of the gaseous stream, wherein the catalytically active composition of the first catalyst comprises at least vanadium oxide, titanium dioxide and antimony oxide and the ratio of vanadium, calculated as VO, to antimony, calculated as SbO, in the first catalyst is from 3.5:1 to 5:1. The source of antimony oxide used for the first catalyst is preferably particulate antimony trioxide having a mean particle size of from 0.5 to 5 &#x3bc;m. The process allows the desired oxidation products to be obtained in high yield over longer periods of time.

Production of aldehydes, carboxylic acids and/or carboxylic acid anhydrides by means of catalysts containing vanadium oxide, titanium dioxide, and antimony oxide

Growing community of inventors

Mannheim, Germany

Samuel Neto