公开(公告)号：US3720577A

公开(公告)日：1973-03-13

申请号：US3720577D

申请日：1970-05-25

Applicant: INT PAPER CO

Inventor： ROYMOULIK S

IPC: D21C9/14 ,  D21C9/16

CPC classification number: D21C9/144

Abstract: A CHEMICAL PULP CAN BE BLEACHED WITH CHLORINE DIOXIDE IN THE FIRST STAGE AND PERACETIC ACID IN THE SECOND STAGE TO A BRIGHTNESS OF 60% OF ABOUT. THE ADDITIVE OF A CHLORINE DIOXIDE THIRD STAGE RESULTS IN A FULLY PLEACHED PULPHAVING A BRIGHTNESS OF 80% OR ABOUT IN JUST 3 STAGES, COMPARED TO THE USUAL 5 OR 6 STAGE SEQIEMCES.

公开(公告)号：US3832276A

公开(公告)日：1974-08-27

申请号：US33886273

申请日：1973-03-07

Applicant: INT PAPER CO

Inventor： ROYMOULIK S ,  BROWN K

IPC: D21C9/147 ,  D21C9/10

CPC classification number: D21C9/1068

Abstract: COLLULOSE PULP IS CONTINUOUSLY BLEACHED AND DELIGNIFIED BY OXYGEN, WITHOUT REQUIRING THE USE OF A CELLULOSE DEPOLYMERIZATION PROTECTIVE AGENT, WHEREBY AN ALKALINE AQUEOUS PULP SLURRY OF A CONSISTENCY OF FROM ABOUT 2 TO 10%, HAVING A PH OF BETWEEN ABOUT 9 AND 14, A REACTION TEMPERATURE OF BETWEEN ABOUT 70* AND 120*C, WITH THE OXYGEN DISSOLVED AND INTIMATELY DISPERSED AND SUBDIVIDED INTO THE SLURRY SO THAT NO AGGLOMERATED BUBBLES ARE FORMED AND THE OXYGENATED PULP SLURRY HAS SUBSTANTIALLY NO BUBBLES EXCEEDING ABOUT 1/16 INCH IN DIAMETER, AND THEREAFTER CONTINUOUSLY INTRODUCING THE SLURRY INTO THE LOWER REGION OF A VERTICAL ELONGATED TOWER AND FLOWING THE SLURRY UPWARDLY THROUGH THE TOWER WITHOUT ANY SUBSTANTIAL AGITATION, SO AS TO GRADUALY DECREASE THE PRESSURE TO WHICH THE SLURRY IS OBJECTED AND CONTINUOUSLY WITHDRAWING TREATED SLURRY FROM THE UPPER REGION OF SAID TOWER.

公开(公告)号：US3716448A

公开(公告)日：1973-02-13

申请号：US3716448D

申请日：1970-05-25

Applicant: INT PAPER CO

Inventor： ROYMOULIK S

IPC: D06M11/79 ,  D21C9/10

CPC classification number: D21C9/1036 ,  D06M11/79

Abstract: Delignification and bleaching of chemical pulp is achieved by treating the pulp in a single stage with oxygen at elevated temperature and pressure in the presence of a protector selected from the group consisting of Na2S2O4 and Na2Sx, where x is an integer from 1 to 4.

Abstract translation: 化学纸浆的脱木质素和漂白是通过在选自Na 2 S 2 O 4和Na 2 S x的保护剂存在下，在升高的温度和压力下用氧处理单阶段的纸浆来实现的，其中x是1至4的整数。