Zimmer Aktiengesellschaft

Lurgi Zimmer Gmbh

Reinhard Wolf

Joachim Seelig

Rudolf Kämpf

Rudolf Kampf

Wolfgang Dilly-Louis

Claus Born

Norman Schnittker

Roland Donaj

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

This invention relates to a continuous and efficient method for the manufacture of highly pure caprolactam suitable for the polycondensation of Polyamide 6 (polycaprolactam) from polyamide waste. In particular the invention relates to a method for the manufacture of caprolactam from waste containing polyamides, including the steps a) depolymerisation of the waste containing polyamides, whereby a caprolactam raw material and a flow containing secondary constituents or additives is obtained, b) at least one distillation of the caprolactam raw material, and c) at least one crystallisation of the caprolactam material obtained in step b), by which means caprolactam is obtained, whereby at least part of the caprolactam obtained in step c) with a permanganate number of&#x3c;10000 sec. and a UV transmission of&#x3c;85% is added to the waste containing polyamides before and/or during the depolymerisation.

Method for the manufacture of caprolactam from waste containing polyamides

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.

Separation process for carpets

The invention relates to a method for the continuous production of caprolactam from waste containing polyamide, comprising

Method for purifying caprolactam from waste containing polyamide using UV radiation

Process for separating preshredded carpet materials into as many as three main components of different densities which comprises finely comminuting the carpet materials in the liquid phase. The density of the liquid phase is adjusted to a level between two adjacent densities of the components. Separation of one component from the other components and from the liquid phase in the suspension is effected in a double-cone full-jacketed screw centrifuge. The process is repeated if there are two materials of different densities in the other components fraction. The process is useful for recovering nylon, polyester, or polypropylene from carpet scraps which nylon or polyester can be depolymerized to reusable monomers and which polypropylene can be reprocessed into pellets, non-wovens or fibers.

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Rodenbach, Germany

Reinhard Wolf