Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste
Patent
1974-10-31
1976-06-15
Bashore, S. Leon
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Waste paper or textile waste
162 8, D21C 502
Patent
active
039635600
ABSTRACT:
Waste paper is effectively deinked by contact with an aqueous treating composition containing an N-alkyllactam solvent at a temperature of from about 110.degree.F to about 210.degree.F. The N-alkyllactam solvent is not consumed in the treating process and can be effectively separated from the waste material removed from the paper being treated for reuse in the contacting of additional quantities of waste paper. The use of N-cyclohexyl pyrrolidone, N-t-butyl pyrrolidone and N-t-octyl pyrrolidone is particularly advantageous in that simplified regeneration techniques of appreciable technical and economic significance can be employed therewith. The aqueous treating composition will generally contain from about 0.5 to about 200 parts by weight of water, from about 0.05 to about 1 part by weight of a water-soluble, non-volatile, inorganic ionic compound, e.g., NaOH, and from about 1 to about 99 parts by weight of the N-alkyllactam solvent. The deinking is carried out at a temperature of from about 110.degree.F to about 210.degree.F. Difficult-to-deink grade material, such as waste paper containing thermoplastic and elastomeric coatings, laminates and adhesives, can be effectively and conveniently deinked by the N-alkyllactam solvent composition.
REFERENCES:
patent: 2964535 (1960-12-01), Clements
patent: 3231576 (1966-01-01), Falbe et al.
patent: 3806460 (1974-04-01), Mukai et al.
patent: 3846227 (1974-11-01), Mestetsky et al.
Mestetsky Thomas S.
Webster Bruce G.
Bashore S. Leon
GAF Corporation
Kehm Walter C.
Smith William F.
Ward Joshua J.
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