Basf Aktiengesellschaft

Basf Se Corporation

Alfred Krause

Hubert Trauth

Alexander Aumueller

Frank-Friedrich Pape

Johann-Peter Melder

Wolfgang Siegel

Hardo Siegel

Tom Witzel

Manfred Julius

Harald Rust

Alexander Aumuller

Franz Borgel

Walter Denzinger

Andreas Deckers

Guido Voit

Albert Hettche

Thorsten Habeck

Bernd Stein

Wolfgang Reif

Tilman Sirch

Frank Haese

Armin Diefenbacher

Gerd-Dieter Tebben

Anton Meier

Karin Sperling

Martin Holderbaum

Martin Rudloff

Roland Bou Chedid

Albin Berger

Mirko Kreitschmann

Joachim-Thierry Anders

Ludwig E Heck

Eckhard Korona

Michael Salla

Hannes Ferdinand Gouverneur

Martin Schloderer

Andreas Edgar Herrmann

A method for reliably avoiding backflow in the transport of a liquid under pressure via a transport pipe (), in which a shut-off device () with differential pressure switching is arranged, into a container () which is under pressure and which comprises the liquid to be transported and/or another liquid is proposed, wherein a pressure accumulator () which is filled with the liquid to be transported up to a certain level and above the liquid level, in direct contact with the liquid to be transported, with an inert gas is arranged in the transport pipe () upstream from the shut-off device () in the transport direction, the inert gas being provided in the pressure accumulator () under an excess pressure and in an amount relative to the container () to be filled which are designed so that, in the case of a drop in the pressure in the transport pipe (), the inert gas ensures a positive pressure difference in the transport pipe () to the container () over a period which is at least as long as the reaction time of the shut-off device () and the shut-off device () has an emptying pipe () with emptying valve ().

Method for safely preventing backflowing in the conveying of a fluid

A process for preparing an N,N-dialkylethanolamine of the formula I having high color stability where Rand Rare each independently a C- to C-alkyl group, by reacting ethylene oxide (EO) with a corresponding dialkylamine (RRNH) in the presence of water, wherein the reaction is effected continuously in a reactor, the reaction temperature is in the range from 90 to 180&#xb0; C. and the residence time (RT) in the reactor is in the range from 1 to 7 min, the reactor output is treated thermally at a temperature in the range from 80 to 160&#xb0; C. over a period in the range from 20 to 1000 min, and then the N,N-dialkylethanolamine is removed by distillation.

Process for preparing an N,N-dialky-ethanolamine having high color stability

Processes comprising: (a) reacting dimethylamine and ethylene oxide to form a product mixture comprising N,N-dimethylethanolamine and N,N-dimethylaminoethoxyethanol; (b) distilling the product mixture to obtain a bottom fraction comprising N,N-dimethylaminoethoxyethanol; and (c) distilling the bottom fraction to separate at least a portion of the N,N-dimethylaminoethoxyethanol from the bottom fraction; and apparatus for carrying out said processes.

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The present invention provides a process for preparing 1,6-hexanediol from a carboxylic acid mixture which comprises adipic acid, 6-hydroxycaproic acid and small amounts of 1,4-cyclohexanediols and is obtained as a by-product in the oxidation of cyclohexane to cyclohexanone/cyclohexanol with oxygen or oxygen-containing gases and by water extraction of the reaction mixture, by esterification of the acids and hydrogenation, in which

Method for producing 1, 6 hexane diol

Malonic ester derivatives of the formula I ##STR1## where the variables have the meaning explained in the description, as photostable UV filters in cosmetic and pharmaceutical preparations for protecting the human skin or human hair from the sun's rays, alone or together with compounds absorbing in the UV region and known for cosmetic and pharmaceutical preparations.

Cosmetic and pharmaceutical preparations containing photostable UV

Sterically hindered 4-amino-piperidine with a low dimer content, its

Process for purifying sterically hindered 4-amino piperidines

Tetramethylpiperidine-containing copolymers

2-cyanoacrylic esters

Maleimide/.alpha.-olefin copolymers are composed of structural units I ##STR1## where R.sup.1 is a tetramethylpiperidinyl radical of the formula II ##STR2## R.sup.3 is hydrogen, C.sub.1 -C.sub.6 -alkyl, formyl, C.sub.2 -C.sub.6 -alkanoyl, C.sub.1 -C.sub.12 -alkoxy, C.sub.5 - or C.sub.6 -cycloalkoxy, cyanomethyl, 2-hydroxyethyl, benzyl or a radical of the formula --CR.sup.4 =CH--CO--OR.sup.5, R.sup.4 is hydrogen, C.sub.1 -C.sub.6 -alkyl or a radical of the formula --CO--OR.sup.5, and R.sup.5 is C.sub.5 -C.sub.18 -alkyl, C.sub.5 -C.sub.8 -cycloalkyl, C.sub.7 -C.sub.18 -aralkyl, phenyl or tolyl, and up to 8 mol %, based on II, of R.sup.1 may furthermore be hydrogen, C.sub.1 -C.sub.22 -alkyl or C.sub.5 -C.sub.8 -cycloalkyl, and R.sup.2 is a mixture of C.sub.14 -C.sub.28 -alkyl groups, where two of these alkyl groups, which may differ by no more than two carbon atoms, each account for at least 30% of this mixture, having an average molecular weight of from 1,000 to 50,000. The copolymers described are suitable as light stabilizers and stabilizers for organic material, in particular plastics and coatings.

Maleimide/.alpha.-olefin copolymers and their use as light stabilizers

N-vinyl-containing glycoluril derivatives and their use as light

Polyalkylpiperidinyl-containing .beta.-aminoacrylic ester derivatives

N-(.beta.-carbony- and .beta.-cyanovinyl)-2,2,6,6-tetramethyl-piperidine

Growing community of inventors

Speyer, Germany

Alfred Krause