氧气加压热处理降低麦草碱法蒸煮黑液黏度的技术  

Viscosity reduction technologies of wheat straw alkaline pulping black liquor by an oxygen enhanced heat treatment

作　　者：张进[1] 曹云峰[1] 刘祝兰[1] 熊林根[1] 

机构地区：[1]南京林业大学,江苏省制浆造纸科学与技术重点实验室,江苏南京210037

出　　处：《南京林业大学学报（自然科学版）》2011年第6期77-80,共4页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：江苏省制浆造纸科学与技术重点实验室资助课题(201017);江苏省青蓝工程中青年学术带头人培养对象省教育厅资助课题

摘　　要：为了降低黑液黏度,对麦草碱法蒸煮黑液进行单纯热处理正交试验和氧气加压热处理正交试验,分析了用碱量、加热温度、保温时间及氧压对黑液黏度的影响。结果表明:氧气加压热处理比单纯热处理更能够有效降低黑液黏度,尤其当黑液质量分数大于30%时黏度降低得更加明显。相对于单纯热处理,氧气加压热处理能使得黑液浓缩的临界浓度提高5%左右。影响黑液氧气加压热处理降黏的最大因素是温度,并且得到较为适宜的降黏工艺条件为:用碱量(以NaOH计,质量分数)1.0%,温度170℃,保温时间45 min,氧压0.7 MPa。In order to reduce the viscosity of black liquor,a three-factor and three-level orthogonal experiment was employed to study the effects of alkali charge,maximum temperature and holding time at the maximum temperature on the viscosity of black liquor from wheat straw soda pulping by a simple heat treatment.While a four-factor and three-level orthogonal experiment was designed to study the effects of alkali charge,maximum temperature,holding time,and oxygen pressure on the viscosity reduction of black liquor from wheat straw soda pulping by an oxygen enhanced heat treatment.The results of variance analysis showed that the viscosity reduction of wheat straw black liquor by heat treatment with oxygen was much efficient than that of treated by simple heat treatment.The viscosity reduction was more prominent when the viscosity concentration more than 30 %.The critical concentration of black liquor treated by heat with oxygen,if compared with the similar heat treatment condition but without oxygen enhanced,increased by around 5 %.And the most remarkable factor which influences the viscosity reduction by heat treatment with oxygen was the maximum temperature.In addition,the optimal condition of heat treatment with oxygen was determined as follows： alkali charge on total solids content was 1.0 %（as NaOH）,with maximum temperature of 170 ℃,holding time at the maximum temperature of 45 min and oxygen pressure of 0.7 MPa.

关 键 词：麦草 碱法蒸煮 黑液 热处理 氧气 

分 类 号：TS229[轻工技术与工程—粮食、油脂及植物蛋白工程]