Process for recovering raw materials from waste cellophane

Details Process for recovering raw materials from waste cellophane Process for recovering raw materials from waste cellophane

1976-09-01

1977-11-29

Griffin, Ronald W.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

260 23, 264 37, 536 57, C08B 908

Patent

active

040606848

ABSTRACT:
An efficient process for recovering raw materials from scrap coated and uncoated cellophane, including usable cellulose, coating resin, and softener, comprising (a) shredding the scrap cellophane, (b) extracting softener and coating resin jointly by washing the shredded film with a tetrahydrofuran solution containing from 2 to 15% by weight water in an extractor, (c) removing the spent wash solution containing softener, coating resin, tetrahydrofuran, and water and rapidly evaporating tetrahydrofuran therefrom while allowing the coating resin to inherently precipitate from the softener, (d) drying the shredded cellophane after removal of the spent wash solution to recover retained tetrahydrofuran and pure cellulose, (e) recycling tetrahydrofuran obtained from the flash evaporating and drying steps to the extractor, and (f) separating the precipitated coating resin from the softener. The recovered cellulose can be used in many ways, such as recycled directly back into the process for the manufacture of cellophane. Recovered softener and coating resin are also suitable for reuse in the production of cellophane.

REFERENCES:
patent: 1994591 (1935-03-01), Reid
patent: 2070027 (1937-02-01), Reid
patent: 2337928 (1943-12-01), Reichel
patent: 3758457 (1973-09-01), Broeck et al.
patent: 3873314 (1975-03-01), Woo et al.
patent: 3884907 (1975-05-01), Laurance et al.
TAPPI, July 1974, vol. 57, No. 7, pp. 56-60, (Eng).

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