Uhde Inventa-fischer Gmbh

Fried. Krupp Gesellschaft MIT Beschrankter Haftung

Karl Fischer Industrieanlagen Gmbh

Inventa-fischer Gmbh & Co. Kg

Thyssen Krupp Ag

Other

Uhde Gmbh

Thyssenkrupp Industrial Solutions Ag

Thyssenkrupp Uhde Gmbh

Rainer Hagen

Hubert Coenen

Udo Muhlbauer

Udo Mühlbauer

Udo Muehlbauer

Ulrich Thiele

Eike Schulz Van Endert

Thomas Hille

Klaus Reimann

Joachim Schulze

Wolfgang Tietz

Christian Atlas

Eckehart Schaaf

Luder Gerking

Gerald Rafler

Rudolf Eggers

Jurgen Hartwig

Ernst Kriegel

Manfred Knuth

Friedrich Weger

Paul Niehues

Geert I V Bonte

Caspar Paetz

Lüder Gerking

Dieter Otto Taurat

Shashank Ghanegaonkar

Siegfried Peter

Heinz Effelsberg

Willi Techlin

Eike Schultz Van Endert

Klaus Richter

Frank Idler

Winfried Reimann

Bernd Hanzsch

Adam B Verweij

Klaus-Dieter Göhler

Heinz Zimmermann

Christopher Hess

Adam Bastiaan Verweij

Klaus-Dieter (deceased) Goehler

Klaus-Dieter GÖHLER

Wilfried Wölzl

Helmut Hastedt

Rainer Wittrien

A method for removing compounds in the gaseous aggregate state from PLA-containing products in the viscous aggregate state by means of a thin-film evaporator. The compounds may be present in the liquid or solid aggregate state in the products under standard conditions. The invention further relates to a polylactide resin prepared in accordance with the method of the invention.

Method for the separation of volatile compounds from viscous products by means of a thin-film evaporator, and polylactide resin

In a practicable continuous or batchwise process for the preparation of a crystallizable polylactic acid mixture, lactic acid may be polycondensed to yield an oligomer, which may then be depolymerized to yield a crude lactide. The crude lactide may be purified to yield a pure lactide, wherein fractionation may be carried out in the purification into an L- or D-lactide-rich fraction and also a meso-lactide-rich fraction. Subsequently a separate ring-opening polymerization of the resulting lactide fractions can be carried out. The individual polylactic acid batches or streams generated by the ring-opening polymerization may then be mixed. The present disclosure further relates to apparatuses for carrying out such processes and polylactic acid mixtures.

Process and apparatus for preparation of a crystallizable polylactic acid mixture, and polylactic acid mixture

The present invention relates to a device and also to a method for separating and recovering a cyclic diester, in particular dilactide or glycolide from polymer melts which include the cyclic diester as impurity. The device and also the method according to the invention allow recovery of the cyclic diester with a high yield and at the same time high purity.

Device and method for separating a cyclic diester from polymer melts

Disclosed is a test and test apparatus used to determine whether lactic acid is suitable for polymerization. The test apparatus comprises a) means for the polycondensation of the lactic acid to form a pre-polymer, b) means for depolymerization of the prepolymer to form dilactide, and c) means for carrying out analytical methods to determine at least one of the dilactide yield and/or the racemization, wherein lactic acid which is suitable for polymerization exhibits a dilactide yield of &#x3e;90% and a racemization of &#x3c;5%.

Quality test for polymerizable lactic acid and method for producing same

A mixture of cyclic diesters derived from lactic acid and in cases a mixture of a racemate of dilactide may be produced in several different processes. In some instances, the process can thereby start from the corresponding alpha-hydroxycarboxylic acids, the corresponding cyclic diesters or oligomers of the corresponding alpha-hydroxycarboxylic acids.

Method for the production of a mixture of lactide derivatives

The present invention relates to a device for separating a biodegradable, intermolecular cyclic diester of an alpha-hydroxycarboxylic acid from material mixtures which contain in addition the alpha-hydroxycarboxylic acid of the diester corresponding thereto. In particular, the diester is thereby dilactide and the acid lactic acid. Furthermore, the present invention relates to a method for separating dilactide from material mixtures, which is based on a modified, distillative method. In addition, the present invention describes a polymerization device, in particular for preparing polylactide. Likewise, purposes of use of both the devices and of the method are indicated.

Cleaning device for separating dilactide from mixtures, polymerisation device, method for separating dilactide from mixtures and use thereof

The present invention relates to a condensation and washing device with which in particular the process vapors which occur during the production of polylactide can be processed and cleaned. Furthermore, the present invention relates to a polymerization device for the production of polylactide and also to a method for processing process vapors which occur during the production of polylactide; possibilities for use of both the condensation and washing devices and of the method are likewise mentioned.

Condensation and washing device, polymerisation device and method for cleaning process steam during the production of polylactide

The present invention relates to a polymerization reactor for continuous polymerization, the reactor being constructed in two stages and comprising a prepolymerization stage which is configured as a stirred vessel or as a loop-type bubble column and also a main polymerization stage which is configured as a tubular reactor. Furthermore, the present invention relates to a method for the production of biodegradable polyester, in particular polylactide, the reactor according to the invention being used. Likewise, the invention relates to a polymerization device which comprises further components in addition to the polymerization reactor.

Polymerisation reactor, polymerisation device, method for producing bio-degradeable polyester and uses

The present invention relates to a method for storing and/or transporting intramolecular cyclic esters (lactones), in particular lactide.

Method for storing and transporting cyclic diesters

The invention relates to a method for producing high-molecular weight polyesters, such as e.g. polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polynaphthalene terephthalate (PEN), polytrimethylene terephthalate (PTT) and/or polyesters of other dicarboxylic acids and diols including copolymers thereof. The invention relates likewise to a device for implementing this method. The latter concerns a single-stage tower reactor with which a method, comprising only two reactors, is made available for the total process.

Method for continuous production of high-molecular weight polyesters and device for implementation of the method

The invention relates to a method for producing high-molecular polyester such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polynaphthalene terephthalate (PEN), polytrimethylene terephthalate (PTT) and/or polyester of other dicarboxylic acids and diols, including the copolymers of the same. The invention also relates to a device for carrying out said method, the device being a single-stage tower reactor by which means a method involving only two reactors is carried out for the entire process.

Method for the continuous production of high-molecular polyester and device for carrying out the method

The invention relates to a method for producing polylactic acid, comprising the steps of obtaining lactic acid from starchy agricultural products by fermentation, ultrapurification of the lactic acid by ultrafiltration, nanofiltration and/or electrodialysis, concentration of the lactic acid and production of a prepolymer, cyclizing depolymerization to dilactide, purification of the dilactide, ring-opening polymerization of the dilactide and demonomerization of the polylactide.

Method for producing polylactic acid and corresponding device

The invention relates to a method for producing polyesters with a reduced content of free acetaldehyde from terephthalic acid and ethylene glycol via a catalyzed polycondensation in the melt and also the use of this method. The method is based thereby on the usage of highly active polycondensation catalysts, on the deactivation of these catalysts by the addition of phosphorous-containing inhibitors and the addition of acetaldehyde-bonding substances. The entire polycondensation is thereby implemented at temperatures beneath 280&deg; C.

Method for producing polyesters with a reduced content of free acetaldehyde

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Berlin, Germany

Rainer Hagen