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AssigneeLenzing Aktiengesellschaft
InventorsWolfram Kalt, Heinrich Firgo, Johann Manner, Eduard Mulleder, Bruno Mangeng, Arnold Nigsch, Franz Schwenninger, Christoph Schrempf
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The invention is concerned with a process for the production of cellulose moulded bodies. In this process, cellulose is first dissolved in an aqueous solution of a tertiary amine-oxide, in particular N-methylmorpholine-N-oxide (NMMO), to produce a mouldable cellulose solution. Second, the cellulose solution is molded and conducted into an aqueous precipitation bath, wherein the cellulose is precipitated, which produces a moulded body and a spent precipitation bath. Next, the spent precipitation bath is regenerated. This regenerated aqueous amine-oxide solution is re-used to dissolve cellulose, thereby repeating the process. In the above process, the repeated aqueous amine-oxide solution has a pH within certain defined limits.
A process for preparing cellulose molded bodies comprising the steps of:
A process for preparing cellulose molded bodies comprising the steps of:
A process for preparing cellulose molded bodies comprising the steps of:
A regenerated solution of tertiary amine-oxide produced by the process of:
A regenerated solution of tertiary amine-oxide produced by the process of:
Dependencies are inferred from the claim text.