影响连续蒸煮得率的因素

［文题］impact of cooking condition on yield and other parametals
［作者］Nam Hee Shin and Bertil Stromberg
［来源］Andritz
［摘要］Two laboratory studies using multiple white liquor additions and multiple black liquor extractions were　carried out to investigate the impact of cooking conditions on pulp yield and other parameters. Results　from the first study (alkali profiles at a constant cooking temperature) indicate that cellulose yield shows a　good correlation with pulp yield and is significantly affected by alkali profiles. A higher alkali charge to　the impregnation stage shows the most negative impact on cellulose yield. There is no　significant　difference in xylan yield between different alkali profiles. In addition, it was found that xylan content　does not correlate with the pulp yield. In spite of obtaining higher cellulose yield when adding more alkali　in the wash zone, a lower pulp yield is obtained at a given kappa number due to lower delignification rate.　The results from the second study indicates that cooking temperature does not affect the pulp yield and　HexA content at a given kappa number but lower pulp viscosity is obtained from a higher temperature　cook. The positive effect of higher H-factor at a higher cooking temperature on pulp yield, pulp viscosity,　and HexA content is also reported.

[ 本帖最后由 thjlaobao 于 2008-9-12 11:13 编辑 ]