Evonik Roehm Gmbh

Evonik Rohm Gmbh

Roehm Gmbh & Co Kg

Dirk Broell

Hermann Siegert

Benedikt Laux

Christian Maul

Joachim Knebel

Wolfgang Klesse

Bardo Schmitt

Guido Protzmann

Gerhard Koelbl

Thomas Kehr

Volker Schleep

Horst Hiltner

Martina Ebert

Patrick Peter

Thomas Krauss

Claus Zimmer

Hans-Gerhard Stadler

The invention relates to a process for preparing N-alkyl(meth)acrylamides by reacting (meth)acrylic anhydride with corresponding alkylamines.

Process for preparing N-alkyl(meth)acrylamides

The present invention relates to a process for purifying monomers, by evaporating at least a portion of the monomers present in a starting composition and then condensing it, which is characterized in that at least a portion of the starting composition is evaporated in a short-path evaporator, the mass flow density of the vapors {dot over (m)} being selected according to the relation (I)  A further aspect of the present invention is a plant for performing the process.

Method and system for purifying monomers

The present invention relates to a process for preparing methacrylic acid based on the hydrolysis of methacrylic esters.

Process for preparing methacrylic acid

The invention relates to a process for continuously preparing N-alkyl(meth)acrylamides by reacting alkyl(meth)acrylates with high-boiling amines. A catalyst activation and specific workup technique achieve product qualities which have not been achieved to date. In addition, very high space-time yields and overall yields can be achieved.

Method for continuously producing alkylamino(meth)acrylamides

Process for distillatively purifying polymerizable compounds using a high-boiling, inert, thermally long-term-stable substance as a boiling oil, characterized in that the boiling oil is disposed in the bottom of a rectification column.

Method for purifying polymerizable compounds

Process for continuously preparing unsaturated carboxylic anhydrides of the general formula IR&#x2014;C(O)&#x2014;O&#x2014;C(O)&#x2014;R&#x2003;&#x2003;(I)in which R is an unsaturated organic radical having 2 to 12 carbon atomsby transanhydridization of an aliphatic carboxylic anhydride with a carboxylic acid of the general formula IIR&#x2014;COOH&#x2003;&#x2003;(II)in which R is as defined abovein a rectification column having an upper, middle and lower region, characterized in that

Method for the continuous production of unsaturated carboxylic acid anhydrides

The invention relates to a method for the continuous production of unsaturated carboxylic acid anhydrides of general formula (I): R&#x2014;C(O)&#x2014;O&#x2014;C(O)&#x2014;R (I), wherein R is an unsaturated organic group with 2 to 12 C atoms, by reaction of a ketene with an unsaturated carboxylic acid of general formula (II): R&#x2014;COOH (II), wherein R is defined as above, in an apparatus which has a reaction zone () for the reaction of a ketene with an unsaturated carboxylic acid of general formula (II), and a reaction zone () for the subsequent reaction of the crude anhydride mixture and a rectification column with an upper, a middle and a lower zone, in the sump of which an inert boiling oil is present.

The invention relates to a method for producing glycerol monomethacrylate (GMMA).

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Langen, Germany

Dirk Broell