Lurgi Zimmer Gmbh

Zimmer Aktiengesellschaft

Rudolf Kämpf

Reinhard Wolf

Joachim Seelig

Wolfgang Dilly-Louis

Norman Schnittker

Roland Donaj

A process for continuous or discontinuous synthesis of elastomeric copolyesters from polybutylene terephthalate (PBT) and polyoxytetramethylene glycol is described in which the tetrahydrofuran (THF) obtained as a byproduct in synthesis of polybutylene terephthalate from 1,4-butanediol is rectified and then reacted by ring-opening polymerization to form polyoxytetramethylene glycol which condenses with the free or esterified carboxyl groups of PBT to form the copolyester, whereby chain termination and catalyst deactivation are accomplished by adding 1,4-butanediol without separating the catalyst.

Method for producing elastomeric copolyesters

The invention relates to a method for the treatment of waste containing polyamide comprising a) depolymerisation of the waste containing polyamide, whereby a caprolactam raw material () and a flow (), comprising the secondary constituents and additives from the depolymerisation, are obtained, and b) leaching of the flow () at least once using an extracting agent.

Method for the treatment of waste containing polyamide with the reprocessing of the depolymerisation residue

The invention relates to a method for the analysis of refuse objects () containing polymers, in particular of carpets, in a recycling plant () and an automatic analytical device (). In order to determine the polymer constituents of the refuse object (), according to the invention, part of the refuse object () is vaporised and examined by a mass spectrometer (). Using the method according to the invention and the automatic analytical device according to the invention, the refuse objects () can be classified for further processing () more accurately and more reliably during transport on a conveyor device ().

Method for the automatic analysis of refuse containing polymers and an automatic analytical device for this purpose

A method is disclosed for producing a vacuum and for separating condensable components present in vapor which accumulates during the production of a polymer by melt-phase polycondensation under vacuum. Vapor produced during the production of polymers by melt-phase polycondensation in at least one reaction step under vacuum is drawn of by at least one steam jet vacuum pump with a down stream injection condenser. The steam jet vacuum pump is driven with alkylene carbonate in vapor form and liquid alkylene carbonate is then supplied to the injection condenser as coolant.

Method of producing vacuum in the production of polymers

Comminuted carpet pieces are fed to a first stirred tank together with an aqueous solution containing separating salt, to form a first suspension, which is fed to a first mechanical separating stage. A first high-solids phase, a second high-solids phase containing polymer fiber material, and a liquid phase are obtained therefrom. The second high-solids phase is mixed with a water-containing separation solution in a stirred tank, to give a second suspension, which is fed to a second mechanical separating stage. A third high-solids phase, a polymer fiber material-rich phase and a liquid phase are withdrawn therefrom. An acid which is stronger than HCOis introduced into the stirred tank together with the water-containing separation solution, and the pH of the liquid in the stirred tank is adjusted to 2&#x2013;6.

Growing community of inventors

Haingründau, Germany

Rudolf Kämpf