High temperature deinking method using an alkylene oxide adduct
AssigneeKao Corporation
InventorsHiromichi Takahashi, Koji Hamaguchi
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Abstract
In the deinking of feed waste papers comprising magazines and newspapers at a weight ratio of magazine to newspaper of from 5/95 to 60/40, a reclaimed pulp with excellent qualities can be obtained by adjusting the treating temperature in the flotation step to 40.degree. to 80.degree. C. and adding a deinking agent, which contains an alkylene oxide adduct of an oil or fat, wherein said alkylene oxide adduct comprises ethylene oxide and propylene oxide added at a molar ratio of ethylene oxide to propylene oxide of from 1/1 to 5/1, and has a cloud point of 45.degree. to 90.degree. C., at least in one of the steps of the deinking process.
Claims14
In a deinking method of feed waste papers, a high temperature deinking method for deinking feed waste papers wherein said waste papers comprise magazines and newspapers at a weight ratio of magazine to newspaper of from 5/95 to 60/40, a deinking agent containing an alkylene oxide adduct of an oil or fat, wherein said alkylene oxide adduct comprises ethylene oxide and propylene oxide added at a molar ratio of ethylene oxide to propylene oxide of from 1/1 to 5/1, and having a cloud point of 45.degree. to 90.degree. C. is added at least in one of the steps of the deinking process, and the flotation is effected at a temperature of from 40.degree. to 80.degree. C.
A high temperature deinking method for deinking waste papers of magazines and newspapers at a ratio of 5/95 to 60/40, respectively by weight comprising:
- adding a deinking agent comprising a reaction product of an alkylene oxide adduct of an oil or fat, wherein said alkylene oxide adduct comprises ethylene oxide and propylene oxide added at a molar ratio of ethylene oxide to propylene oxide of from 1/1 to 5/1, and glycerol, and having a cloud point of 45.degree. to 90.degree. C., to at least one step in the deinking process, and conducting a floatation step at a temperature of from 40.degree. to 80.degree. C.
Dependencies are inferred from the claim text.