3m Innovative Properties Company

Ineos Styrolution Group Gmbh

Achim Schmidt-Rodenkirchen

Klaus Hintzer

Thorsten Gerdes

Konstantin Mierdel

Tilman C Zipplies

Norbert Niessner

Arne Thaler

Markus E Hirschberg

Monika A Willert-Porada

Bianca Wilhelmus

Thomas G Kolbeck

Frank Neuner

Gregg D Dahlke

Denis Duchesne

Mark W Muggli

Thomas Kolbeck

Gunther J Kaempf

Sebastian Seidl

Thomas Berger

Stephan Aschauer

Monika Willert-Porada

Peter Bauer

Matthias Wieland

Thomas W Schoettle

Jens Herdegen

Andreas Spiewok

Christoph Schymura

The process produces a fluorinated olefin from a fluorinated copolymer having at least one of sulfonic acid groups, carboxylic acid groups, or salts thereof. The process includes heating the fluorinated copolymer at a first temperature not more than 450° C. to decompose at least one of the sulfonic acid groups, carboxylic acid groups, or salts thereof to form a partially pyrolyzed intermediate and subsequently heating the partially pyrolyzed intermediate at a second temperature of at least 550° C. to produce the fluorinated olefin.

Process of making fluoroolefins by thermal decomposition of fluorinated ionomers

The invention relates to a method for producing styrene monomers by the depolymerisation of polystyrene in the presence of foreign polymers, such as polyolefins. Said method comprises the following steps: a) introducing a polymer composition (A) containing: I) 10 to 99.5% by weight, based on the polymer composition (A), of polystyrene (I); and II) 0.1 to 89.9% by weight of polyolefin (II); and/or III) 0.1 to 4.9% by weight of acrylonitrile-based polymer (III); and/or IV) 0.1 to 4.9% by weight of polyester (IV), into the reaction zone (R) of a pyrolysis reactor (P); b) thermal cracking the polystyrene contained in the polymer composition (A) in the reaction zone (R) of the pyrolysis reactor (P) at a temperature of between 400-1000° C., c) removing the product mixture (G) obtained from the reaction zone (R), d) cooling of the product mixture (G), and e) separating the styrene monomers from the further components.

Method for the depolymerisation of polystyrene in the presence of foreign polymers

The invention relates to a process for the preparation of styrene monomers by depolymerising polystyrene, to a device for carrying out the process and to the use of a fluidised bed reactor for the depolymerisation of polystyrene. Said process comprising the following steps: a) feeding a polymer composition (A) containing 60 to 99.9 wt. polystyrene, based on the total weight of the polymer composition (A), into the reaction zone (R) of a pyrolysis reactor (P); b) thermally cracking the polystyrene contained in the polymer composition (A) in the reaction zone (R) of the pyrolysis reactor (P) at a temperature of between 400° C. to 1000° C. to obtain a product mixture (G) containing styrene monomers and other components; c) removing the product mixture (G) obtained in step b) from the reaction zone (R) of the pyrolysis reactor (P); d) cooling the product mixture (G) removed in step c) to obtain a condensed product mixture (K) containing styrene monomers and further components; and e) separating the styrene monomers from the further components of the condensed product mixture (K) obtained in step d), wherein the average residence time (Z) of the polymer composition (A) in the reaction zone (R) of the pyrolysis reactor (P) is from 0.01 sec to 10 sec.

Process for the depolymerization of polystyrene

Methods of converting a variety of fluorinated materials into anhydrous hydrogen fluoride are described. The methods include thermally decomposing the fluorinated materials into a gaseous effluent comprising hydrogen fluoride and carbon dioxide. This gaseous effluent is then treated with carbon at a temperature of at least 830° C., converting the carbon dioxide to carbon monoxide (CO) and producing a gaseous product comprising the hydrogen fluoride, which can be condensed to generate anhydrous hydrogen fluoride. These methods can also be used to convert water contained in the gaseous effluent into hydrogen.

Converting fluorinated materials into anhydrous hydrogen fluoride

Mechanical stirred bed reactors that incorporate a screen are described. Methods of using such reactors to process perfluoropolymers to form perfluorinated olefin monomers are also described. The reactors and methods may be used to upcycle filled perfluorinated materials.

Upcycling perfluoropolymers into fluorinated olefins

Provided is a process for producing fluorinated alkenes by providing a microwave plasma in a reactor chamber, introducing a protective gas feed into the reactor chamber, and contacting a conversion feed comprising at least one fluorinated linear or branched alkane with the plasma. Also provided are an apparatus and the use of the process and the apparatus.

Process and apparatus for producing fluorinated alkenes

The invention relates to a process for producing free-flowing calcium fluoride particles from a diluted aqueous solution of hydrogen fluoride comprising the step of reacting the diluted aqueous solution of hydrogen fluoride with calcium carbonate particles at a temperature of less than 50&#xb0; C. The invention further relates to the use of the free-flowing calcium fluoride particles for the manufacturing of anhydrous hydrogen fluoride.

Method for the production of free flowing synthetic calcium fluoride and use thereof

Process for producing fluorinated olefins from fluorinated materials, the process comprising thermally decomposing the fluoropolymers into fluoroolefins in a reactor having a feeding zone where the fluorinated materials are fed into the reactor and a decomposition zone where the fluorinated materials are thermally decomposed and wherein the thermal decomposition is carried out in the presence of microwave irradiation.

Process of making fluoroolefins by thermal decomposition of fluorinated materials

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Bayreuth, Germany

Achim Schmidt-Rodenkirchen