<p>Secondary pulp is deinked and bleached by contacting the pulp simultaneously with oxygen, alkali, and a surfactant in a reaction zone followed by washing to recover a secondary fiber product. Simultaneous contacting with oxygen and surfactant yields higher pulp brightness than sequential contacting in oxygen bleaching and washing stages, and enhances bleachability in further bleaching stages.</p>
申请公布号
DE69217164(D1)
申请公布日期
1997.03.13
申请号
DE1992617164
申请日期
1992.11.06
申请人
AIR PRODUCTS AND CHEMICALS, INC., ALLENTOWN, PA., US