Recycling of cellulosic textiles
AssigneeRe:Newcell AB
InventorsChristofer Lindgren, Gunnar Henriksson, Mikael Lindström
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Abstract
A method for recycling textiles comprising cellulose with the following steps of: optionally disintegrating the textile, swelling the cellulose, under reducing conditions, wherein at least one reducing agent is present at least during a part of the swelling, and then performing at least one of the following two bleaching steps in any order: i) bleaching the material with oxygen at alkaline conditions with a pH in the range 9-13.5, and ii) bleaching the material with ozone at acid conditions below pH 6. An advantage is that the yield is improved at the same time as excellent decolourization is achieved. If the recycled material is used in viscose manufacture, the risk of clogging nozzles and so on is reduced.
Claims18
A method for recycling textiles comprising cellulose, said method comprising the sequential steps:
- a. providing at least one textile material comprising cellulose,
- b. treating the material to swell the cellulose, under reducing conditions, wherein at least one reducing agent is present at least during a part of the swelling,
- c. performing at least one of the following two bleaching steps in any order
- i. bleaching the material with oxygen at alkaline conditions with a pH in the range 9-13.5, and
- ii. bleaching the material with ozone at acid conditions below pH 6,
- d. recovering the cellulose and using the cellulose for making new textiles or for any other purpose where cellulose is used.
The method according to 1, wherein the bleaching in step c)-i) is carried out at a temperature in the interval 60-120° C.
Dependencies are inferred from the claim text.