Oxygen bleaching of cotton linters by disproportionation of hydr

Details Oxygen bleaching of cotton linters by disproportionation of hydr Oxygen bleaching of cotton linters by disproportionation of hydr

1991-11-12

1994-06-21

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

8111, 162 78, 162 95, D21C 9147, D21C 916

Patent

active

053226470

ABSTRACT:
In a process for chlorine-free bleaching of cellulose with an .alpha.-cellulose content of more than 90%, preferably from boiled cotton linters, more than 75% whiteness is achieved in a single-stage process using oxygen. The bleaching is conducted using the oxygen obtained by disproportionation of peroxo compounds in the pH range from 6 to 13 and with the bleaching time, depending on the bleaching temperature of 35.degree. C. to 15.degree. C., being between 15 and 150 minutes.

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