Recycling of dyed cellulosic waste
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United States of America Patent
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Mar 11, 1997
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N/A
app pub date -
Dec 8, 1995
filing date -
Dec 13, 1994
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Expired
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Abstract
A process which comprises suspending a reactive-dyed cellulose material, optionally in mixture with pulp, in an alkali metal hydroxide solution (alkali cellulose), optionally subjecting the alkali cellulose to the action of a reducing sulfur compound at a temperature from 20.degree. to 80.degree. C., then allowing the alkali cellulose to ripen at temperatures from 30.degree. to 80.degree. C. for at least 30 minutes, dissolving the alkali cellulose at a temperature from 10.degree. to 30.degree. C. by conversion with carbon disulfide into the xanthate, and spinning the xanthated alkali cellulose into fibers, makes it possible to recycle cellulosic waste textiles into similarly colored or colorless cellulose fiber materials.
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