Production of cellulose from cotton or cotton blends
OwnerReiner MANTSCH, Mathias LEIMBRINK +1inventors
InventorsReiner MANTSCH, Mathias LEIMBRINK, Arne HÜNEKE
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Abstract
A method for the production of a cellulosic polymer with a cellulose content of at least 92% from textile waste material, wherein an educt of a mixture of cotton and PET with a fire length of at most 1 mm is treated in a reactor with subcritical water at a temperature of 130-200° C., particularly preferably between 160° C.-200° C. and a pressure in a range of between 1-25 bar, preferably between 1-10 bar for about 1-120 mins and wherein a cellulose polymer with an average degree of polymerisation of between 450-650 is formed.
Claims21
-17. (canceled)
A method for producing a cellulosic polymer, wherein the method comprises:
- providing the reactant, namely a mixture of cotton and PET having a fiber length of at most 60 mm-1 mm,
- treating the reactant in a reactor with subcritical water at a temperature of 130-200° C., particularly preferably 160° C.-200° C. and a pressure in a range of 1-25 bar, preferably 1-10 bar for approximately 1-120 min, wherein
- no catalyst is added and the pH is between 5 and 7 during the entire reaction time,
- the method takes place with exclusion of oxygen.
A method for producing a cellulosic polymer, wherein the method comprises filtering, washing, pressing, drying, and evaporation in a subsequent step.
Dependencies are inferred from the claim text.