Evonik Degussa Gmbh

Phillip R James

Manfred Neumann

Oliver Erpeldinger

Felix Nissen

Stefanie Rinker

Frank Kraushaar

Peter Watkins

Bettina Ludwig

Stefanie Weyler

Andrew Timothy Boam

Velichka Yordanova Koleva

Yuri Bouwhuis

Bettina Bressel

The present invention relates to production processes for reactive monomer species. The method described herein may be used in a variety of reactive monomer production processes to optimize the use of polymerization inhibitor compounds, which may lead to further advantages such as debottlenecking or elimination of process plant separation unit(s). The method provides for the separation of oligomeric/polymeric species, inhibitor compounds and reactive monomer, optionally in the presence of unreacted raw materials or solvent(s), within the production process by means of membrane filtration, particularly through the use of solvent stable membranes, and in particular by applying organic solvent nanofiltration membranes.

Method for improved reactive monomer production with membrane filtration

A process for inhibiting the polymerization of cyclopentadiene compounds (B) by contacting the cyclopentadiene compound with a quinone methide compound (A) of structure (I),  Compositions (AB) comprising (A) and (B) are also provided.

Process and composition for inhibiting the polymerization of cyclopentadiene compounds

A process for inhibiting the polymerization of cyclopentadiene compounds (B) by contacting the cyclopentadiene compound with a quinone methide compound (A) of structure (I), Compositions (AB) comprising (A) and (B) are also provided.

An olefinically unsaturated monomer is stabilized by a retarder-containing composition which comprises a solvent and a quinone methide as a retarder.

Process for stabilizing olefinically unsaturated monomers

A method for preparing a substituted 1,4-quinone methide from a 3,5-disubstituted 4-hydroxybenzaldehyde is provided. Also provided is a method to prepare a 3,5-disubstituted 4-hydroxybenzaldehyde from the corresponding 2,6-disubstituted phenol.

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Tenby, United Kingdom

Phillip R James