发明名称 |
Medium consistency ozone brightening of high consistency ozone bleached pulp. |
摘要 |
A process for delignifying and bleaching a lignocellulosic material (2) without the use of elemental chlorine or chlorine-containing compounds by forming (4) a pulp, oxygen delignifying (40) the pulp and thereafter further delignifying the oxygen delignified pulp by lifting, displacing and tossing the pulp in a radial direction while advancing it in an axial direction in a plug fow-like manner with an effective amount of ozone (88) for a sufficient time to obtain a substantially delignified pulp having a GE brightness of at least about 35 %. The substantially delignified pulp may then be brightened to a final product by treating the pulp with a brightening stage peroxide compound, followed by subsequently treating the pulp at low to medium consistency with ozone. |
申请公布号 |
ZA9406807(B) |
申请公布日期 |
1995.06.28 |
申请号 |
ZA19940006807 |
申请日期 |
1994.09.05 |
申请人 |
UNION CAMP PATENT HOLDING INC. |
发明人 |
SPENCER W EACHUS;OMAR F ALI;GEORGE PANGALOS;BRUCE F GRIGGS;THOMAS P GANDEK;MICHAEL A PIKULIN;ALLEN ROSEN |
分类号 |
D21C9/10;D21C9/147;D21C9/153;D21C9/16 |
主分类号 |
D21C9/10 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|