Lenzing Aktiengesellschaft

Christian Weilach

Richard Herchl

Christoph Klaus-Nietrost

Christian Sperger

Sabrina Theis

Andrea Borgards

Gabriele Schild

Susanne Möderl

Stephan Silbermann

The invention relates to a method for the treatment and utilization of waste liquor containing at least polyester degradation products and originating from an alkaline pulping process for the extraction of cellulose raw material from blended textile waste which contains at least a cellulose component and a polyester component. In order to make the method environmentally friendlier and more resource-efficient, it is proposed that the method comprises the following steps: the evaporation of water from the waste liquor in order to precipitate the polyester degradation product from the waste liquor and to obtain a two-phase mixture having an aqueous phase and a solid phase including the polyester degradation product, b) the separation of the solid phase from the liquid phase, and c) the thermal/energetic utilization of the solid phase.

Method for the utilization of constituents from blended textile wastes

A method for providing a treated cellulose-comprising starting material (), in particular a starting material for forming a, in particular regenerated, cellulosic molded body () is described. The method comprises: i) supplying a cellulose-comprising starting material () which comprises cellulosic fibers, and treating () the cellulose-comprising starting material (), to obtain the treated cellulose-comprising starting material (), such that the cellulose fibers of the treated cellulose-comprising starting material () comprises a predetermined fiber length distribution. Furthermore, a method for manufacturing a cellulosic molded body (), a treated cellulose-comprising starting material (), and a use of used textiles are described.

Process for preparing a broken-up, cellulose-containing, starting material with a predefined fibre-length distribution

A method for manufacturing a cellulosic paper material () is described. The method comprises: i) providing () used textiles as starting material (), wherein the used textiles comprise cellulose and non-cellulosic foreign matters (in particular synthetic plastics and/or metal oxides), ii) at least partially depleting () the non-cellulosic foreign matters from the cellulose, to provide a depleted starting material (), and iii) forming () the cellulosic paper material () from the depleted starting material (). Furthermore, a cellulosic paper material () made of recycled used textiles and a use of used textiles for providing a cellulosic paper material () are described.

Method for producing a cellulose paper material from used textiles

A method of manufacturing a molded body which comprises cellulose, wherein the method comprises: i) providing a starting material which comprises cellulose and elastane, in particular wherein the elastane in the starting material is present separated from the cellulose, wherein the starting material is a solid body, and ii) generating the molded body which comprises cellulose, in particular by a lyocell-method or a viscose-method, on basis of the starting material, such that the regenerated cellulosic molded body comprises at least a part of the elastane of the starting material. The part of the elastane of the starting material is incorporated in the regenerated cellulosic molded body. Furthermore, a regenerated cellulosic molded body which comprises elastane incorporated in the cellulose, and which is manufactured according to a lyocell-method or a viscose-method.

Molded body which comprises elastane incorporated in cellulose and manufacturing method

What is shown is a method for the recovery of raw materials from blended textile wastes, which includes the following steps in the given order: a) providing blended textile waste that includes at least a cellulose component and at least a polyester component, b) treating the blended textile waste in an aqueous treatment solution in order to depolymerize the polyester component and dissolve it in the treatment solution, c) separating the cellulose component from the treatment solution and recovering a cellulose raw material, d) filtering the treatment solution in order to remove foreign substances, particularly dyes and metal ions, from the treatment solution, and e) precipitating terephthalic acid from the treatment solution, separating the precipitated terephthalic acid, and recovering a terephthalic-acid-including polyester raw material. In order to, within the scope of the mentioned method, enable the recovery of raw materials with an increased level of purity, it is proposed that filtering the treatment solution in step d) should at least comprise a filtration by an adsorbent filter medium.

Method for the recovery of starting materials from blended textile wastes

A method for providing a treated cellulose-comprising mixed starting material (), in particular a mixed starting material () for forming a, in particular regenerated, cellulosic molded body () is described. The method comprises: i) providing () a first starting material () which comprises a lignocellulosic raw material, ii) providing () a second starting material () which comprises a cellulose-containing lignin-free product, iii) mixing () the first starting material () and the second starting material () to a mixed starting material (), and iv) at least partially commonly treating () the first starting material () and the second starting material () for obtaining the treated mixed starting material (), in particular a mixed pulp.

Common preparation of lignocellulosic feedstock and a product containing cellulose but free from lignin

A method of recycling a mixed textile, wherein the method comprises: i) supplying the mixed textile, wherein the mixed textile comprises cellulosic fibers and synthetic fibers, wherein the synthetic fibers comprise at least one synthetic plastic, ii) at least partially depleting the synthetic plastic from the cellulose, and iii) further processing the depleted mixed textile after depleting.

Method of reusing a mixed textile comprising cellulose and synthetic plastic

A recycled cellulose raw material and a method for recycling a cellulose raw material from blended textile waste with high reliability and yielding high raw material quality is shown, the method comprising the steps in the given order: providing the blended textile waste containing at least one cellulose component and at least one synthetic polymer component, treating the blended textile waste in a non-oxidizing aqueous treatment medium in order to degrade the at least one synthetic polymer component, whereby the treatment is carried out at a temperature between 100° C. and 200° C., and obtaining the recycled cellulose raw material from the treated blended textile waste.

Cellulose raw material and method for recycling a cellulose raw material from blended textile waste

A process () for separating a fibrous target component () from textile waste () is shown, said textile waste () containing the target component () and at least one ancillary component (), whereby the target component () consists of water-swellable textile fibers () with a density higher than the density of water, the process () comprising the steps: a) dispersing the comminuted textile waste () in an aqueous solution () to obtain a suspension () containing the textile waste (), and b) separating the dispersed textile waste () into a high-density target fraction () comprising the target component (), and a low-density residual fraction () comprising the at least one ancillary component (), according to the respective density of said components (). In order to provide a reliable, fast process for the separation of water-swellable fibers from other textile fibers which are similar in density, it is proposed, that the aqueous solution () is an alkaline aqueous solution () and the target component fibers () are swelled in the alkaline aqueous solution () prior to step b), thereby increasing the density and weight of said target component () relative to the density and weight of the ancillary component ().

Process for separating a fibrous target component from textile waste

The present invention relates to a method of pulping cotton-based raw material for producing dissolving pulp. More specifically, the invention relates to a process for producing dissolving pulp under alkaline conditions in combination with a gaseous oxidizing agent. The present invention further relates to dissolving pulp obtainable by pulping cotton-based raw material, in particular dissolving pulp obtainable by the method of the present invention, the use of such dissolving pulp for producing regenerated cellulose molded bodies, and methods of producing lyocell or viscose including such dissolving pulp.

Method of pulping cotton-based raw material

A method of producing a chemical pulp from a textile material which comprises cellulose for manufacturing regenerated cellulosic molded bodies, wherein in the method the textile material is comminuted, at least a part of non-fiber-constituents of the comminuted textile material is separated from fiber-constituents of the comminuted textile material, at least a part of non-cellulosic fibers of the fiber-constituents is mechanically separated from cellulosic fibers of the fiber-constituents, at least a further part of the non-cellulosic fibers is chemically separated from the cellulosic fibers, and producing regenerated molded bodies from the chemical pulp based on the cellulosic fibers after mechanically separating and chemically separating.

Method of producing a chemical pulp from a textile material which comprises cellulose and a molded body from the chemical pulp

Method of manufacturing a regenerated cellulosic molded body, wherein the method comprises supplying a starting material which comprises cellulose and at least one foreign matter, transferring at least a part of the starting material with at least a part of the at least one foreign matter into a spinning mass which additionally contains a solvent for solving at least a part of the cellulose of the starting material in the solvent, and extruding the spinning mass to the molded body, and subsequently precipitating in a spinning bath, wherein thereby the molded body is obtained, wherein the molded body comprises cellulose and at least a part of the at least one foreign matter.

Functionalization of foreign material in lyocell-methods

Method of recycling a textile material which comprises cellulose for manufacturing regenerated cellulosic molded bodies, wherein in the method the textile material is comminuted, at least a part of non-fiber-constituents of the comminuted textile material is separated from fiber-constituents of the comminuted textile material, at least a part of non-cellulosic fibers of the fiber-constituents is mechanically separated from cellulosic fibers of the fiber-constituents, at least a further part of the non-cellulosic fibers is chemically separated from the cellulosic fibers, and the molded bodies are generated based on the cellulosic fibers after mechanically separating and chemically separating.

Method of reusing a textile material which comprises cellulose

Method of manufacturing a cellulose-regenerated-molded body, wherein the method comprises supplying a starting material which is manufactured by a lyocell-method and which comprises cellulose, which is manufactured by solving a cellulose source in a solvent for manufacturing a spinning mass, by extruding the spinning mass and by subsequently precipitating in a spinning bath, solving the starting material which comprises cellulose, in a solvent for manufacturing a spinning mass, and extruding, and subsequently precipitating the spinning mass in a spinning bath, wherein thereby the molded body is obtained.

Reusing of lyocell-cellulose for lyocell-methods

Method of identifying a product which comprises cellulose, wherein in the method a data set is determined which is indicative for multiple constituents of the product or a preform of the product, and the data set which is correlated with the product or the preform is stored in a database.

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Vöcklabruck, Austria

Christian Weilach