US 12,528,232 B2Granted

Method for the utilization of constituents from blended textile wastes

AssigneeLenzing Aktiengesellschaft

InventorsRichard Herchl, Christoph Klaus-Nietrost, Sabrina Theis, Christian Weilach

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Abstract

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.

Claims11

Dependent claims

A method for the treatment and utilization of waste liquor, the waste liquor being aqueous and containing polyester degradation products, the method comprising the following steps:

a) obtaining the waste liquor by extracting a cellulose raw material from a blended textile waste, the blended textile waste comprising a cellulose component and a polyester component, wherein the polyester component undergoes an alkaline hydrolysis to form the polyester degradation products and wherein the cellulose component is separated from the polyester degradation products to obtain the cellulose raw material,
b) evaporating water from the waste liquor to precipitate the polyester degradation products from the waste liquor and to obtain a two-phase mixture having an aqueous phase and a solid phase, the two-phase mixture including the polyester degradation products,
c) separating the solid phase from the aqueous phase, and
d) utilizing the solid phase.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 17/784,520Filed 3 Dec 2020
Priority: EP 1921600113 Dec 2019
Published: US 2023/0025524 A126 Jan 2023
Granted: 20 Jan 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification20 codes

B29B 17/02
Recovery of plastics or other constituents of waste material containing plastics: separating plastics from other materials
C08B 16/00
Regeneration of cellulose
D21C 3/02
Pulping cellulose-containing materials: with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
D21C 5/00
Production of cellulose by removing non-cellulose substances from cellulose-containing materials: other processes