Organic compounds -- part of the class 532-570 series – Organic compounds – Carbohydrates or derivatives
Patent
1978-07-26
1979-03-20
Griffin, Ronald W.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carbohydrates or derivatives
264 37, 536 56, 536 57, 536 61, C08B 908
Patent
active
041455339
ABSTRACT:
A method for recycling regenerated cellulose scrap such as uncoated cellophane and rayon produced in the viscose process. The regenerated cellulose scrap is first shredded into relatively small flakes and then emulsion-xanthated at a temperature ranging from 18.degree. to 30.degree. C. in an aqueous solution of sodium hydroxide and carbon disulfide. The amount of regenerated cellulose scrap added to the solution is controlled to maintain the total cellulose concentration at from 3 to 5% by weight of the solution. At least 38% by weight carbon disulfide based on the weight of the cellulose is used in the solution and the solution is made up to contain from about 10.3 to 11.3% by weight sodium hydroxide based on the weight of the solution so that sufficient sodium hydroxide is present to give about 9.5 to 10.5% by weight in the resulting scrap viscose. After emulsion-xanthation, the scrap viscose is blended in amounts up to 15% by weight with conventional production viscose so that up to 8% of the total cellulose in the mixture originates from the scrap cellulose. The mixture is then used to produce high quality regenerated cellulose products such as cellophane.
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Griffin Ronald W.
Habel Robert W.
Olin Corporation
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