公开(公告)号：US3657065A

公开(公告)日：1972-04-18

申请号：US3657065D

申请日：1969-06-11

Applicant: SOUTH AFRICAN PULP PAPER ,  AIR LIQUIDE

Inventor： SMITH LEON ,  CALVERT DAVID W ,  ROBERT ANDRE ,  VIALLET ANDRE

IPC: D21C9/10

CPC classification number: D21C9/1036

Abstract: A method of delignifying and bleaching a chemical or semichemical cellulose pulp with oxygen gas in an alkaline medium, preferably sodium hydroxide, and in the presence of a protector, the method being characterized in that the protector is selected from the group consisting of silica; an alkali metal silicate, such as sodium silicate; an alkaline earth metal silicate, such as magnesium silicate; an alkaline earth metal phosphate, such as magnesium phosphate; an alkaline earth metal oxide, such as magnesium oxide; an alkaline earth metal peroxide; an alkaline earth metal hydroxide or a material forming an alkaline earth metal hydroxide, such as magnesium hydroxide or a material forming magnesium hydroxide in situ; and a soluble salt of magnesium other than magnesium carbonate.

Abstract translation: 一种在碱性介质（优选氢氧化钠）中用氧气将化学或半化学纤维素纸浆脱木质素和脱色的方法，并且在保护剂存在下，该方法的特征在于保护剂选自二氧化硅 ; 碱金属硅酸盐，如硅酸钠; 碱土金属硅酸盐，如硅酸镁; 碱土金属磷酸盐，如磷酸镁; 碱土金属氧化物，如氧化镁; 碱土金属过氧化物; 碱土金属氢氧化物或形成碱土金属氢氧化物如氢氧化镁或原位形成氢氧化镁的材料的材料; 以及碳酸镁以外的镁的可溶性盐。