A series of Reed Pulps were prepared in which the level of Non-Process Elements(NPEs), including calcium, manganese,copper,iron were seclectively enriched and depleted, these pulps were then oxygen delignification,and...A series of Reed Pulps were prepared in which the level of Non-Process Elements(NPEs), including calcium, manganese,copper,iron were seclectively enriched and depleted, these pulps were then oxygen delignification,and the pulps were characterized according to kappa number,viscosity,brightness. The results indicated that the enrichment of NPEs have an important effulence on delignification,pulp viscosity and brightness, iron is the most harmful during oxygen delignification but manganese is just like a kind of aid and can enhance brightness and delignification.展开更多
Dioxins are believed the most poisonous compounds in the world. Dioxin pollution is a strategic problem in papermaking industry which must be solved. Dioxin not only exists in pulp, paper products, but also in the vol...Dioxins are believed the most poisonous compounds in the world. Dioxin pollution is a strategic problem in papermaking industry which must be solved. Dioxin not only exists in pulp, paper products, but also in the volatile of woods, hips or other non-wood fiber material which are treated with PCP, even in the exhaust gas of chemical recovery system. So there are great needs to know what is dioxin, the channel and mechanism of the formation of it in paper making industry. With these understanding, herein those are discussed as follows, the harness measure of dioxin: dioxin in wastewater, in exhaust gas, from raw material. And some countermeasure to decrease the content of dioxin. Furthermore, several novel treatment technologies of dioxin in China and abroad were introduced. The fundamental measure to eliminate the pollution of dioxin is presented with the aim to control the origin, decrease the use of bleacher containing chlorine or without the use of chlorine. Elemental Chlorine Free and Total Chlorine Free bleaching are advocated.展开更多
文摘A series of Reed Pulps were prepared in which the level of Non-Process Elements(NPEs), including calcium, manganese,copper,iron were seclectively enriched and depleted, these pulps were then oxygen delignification,and the pulps were characterized according to kappa number,viscosity,brightness. The results indicated that the enrichment of NPEs have an important effulence on delignification,pulp viscosity and brightness, iron is the most harmful during oxygen delignification but manganese is just like a kind of aid and can enhance brightness and delignification.
文摘Dioxins are believed the most poisonous compounds in the world. Dioxin pollution is a strategic problem in papermaking industry which must be solved. Dioxin not only exists in pulp, paper products, but also in the volatile of woods, hips or other non-wood fiber material which are treated with PCP, even in the exhaust gas of chemical recovery system. So there are great needs to know what is dioxin, the channel and mechanism of the formation of it in paper making industry. With these understanding, herein those are discussed as follows, the harness measure of dioxin: dioxin in wastewater, in exhaust gas, from raw material. And some countermeasure to decrease the content of dioxin. Furthermore, several novel treatment technologies of dioxin in China and abroad were introduced. The fundamental measure to eliminate the pollution of dioxin is presented with the aim to control the origin, decrease the use of bleacher containing chlorine or without the use of chlorine. Elemental Chlorine Free and Total Chlorine Free bleaching are advocated.
