Uhde Inventa-fischer Gmbh

Thyssen Krupp Ag

Thyssenkrupp Industrial Solutions Ag

Thyssenkrupp Uhde Gmbh

Udo Mühlbauer

Rainer Hagen

Joachim Schulze

Wolfgang Tietz

Caspar Paetz

Shashank Ghanegaonkar

Willi Techlin

Klaus-Dieter Göhler

Adam Bastiaan Verweij

Klaus-Dieter GÖHLER

Habib Dr Driouch

Caspar Dr Paetz

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

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Berlin, Germany

Udo Mühlbauer