RECYCLING OF STYRENE OLIGOMERS BY DE-POLYMERIZATION PROCESS

A process for producing styrene monomers from styrene oligomers comprises the following steps: a) providing a composition (A) comprising at least one type of styrene oligomer, wherein the composition (A) comprises at least 15 wt.-% of styrene dimers and/or styrene trimers; b) providing a depolymeriz...

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Bibliographic Details
Main Authors NIESSNER, Norbert, MIERDEL, Konstantin, SCHMIDT-RODENKIRCHEN, Achim, WILHELMUS, Bianca
Format Patent
LanguageEnglish
Published 02.05.2024
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Summary:A process for producing styrene monomers from styrene oligomers comprises the following steps: a) providing a composition (A) comprising at least one type of styrene oligomer, wherein the composition (A) comprises at least 15 wt.-% of styrene dimers and/or styrene trimers; b) providing a depolymerization reactor (R) with a reaction zone (Z); c) feeding the composition (A) into the reaction zone (Z) of the reactor (R); d) depolymerizing the at least one type of styrene oligomer in the reaction zone (Z) to obtain a composition (B), comprising styrene monomers; e) removing the composition (B) from the reaction zone (Z); and f) isolating the styrene monomers from the composition (B); wherein the temperature (T) inside the reaction zone (Z) is above 500° C. to below 800° C. and the average residence time (tA) of the composition (A) in the reaction zone (Z) is greater than 0.01 s and less than 60 s.
Bibliography:Application Number: US202218546856