摘要
研究了超滤技术处理麦草蒽醌-亚硫酸铵(麦草亚铵)法黑液的规律,探讨了超滤膜的选择、温度、压力等操作参数对超滤过程的影响。研究表明:截留分子质量为10ku的聚醚砜(PES)超滤膜较适合于分离此黑液,并具有较好的抗污染性;在操作压力0.20MPa、温度25℃下进行超滤,随着体积减少量(VR)的增加,灰分的透过率增加,截留液被浓缩。对超滤处理前后的黑液进行物化性能的对比研究表明:超滤后截留液中的木质素高相对分子质量(Mr)部分比例增加;截留液中的磺酸基、羧基和酚羟基的含量均比黑液中的高;组成与结构上的变化对物化性能的影响表现在:净浆流动度提高了45.7%,即通过超滤能增强黑液的应用性能。
Ultrafihration of ammonium sulfite pulping black liquor of wheat straw was investigated. The effects of membrane with different cut-offs, temperature, pressure and volume concentration were investigated. Experimental results indicated that the membrane with a cut-off of 10 ku was suitable for concentrating wheat straw black liquor and has a good anti-deterioration property against black liquor. Under the operating pressure 200 kPa, temperature 25℃, with the increase of volume reduction （ VR ）, the permeation of ash was increased and the retentate was concentrated. Comparison on chemical structural characteristics and physical properties of black liquors before and after uhrafiltration showed that molecular weight of lignin in retentate was higher than that in the initial liquor; contents of sulfogroup, carboxyl, phenolic hydroxyl groups which are the main functional groups in retentate were all higher than those in the initial. Meanwhile, the retentate had better performance than the initial liquor used as surfactant, as additive in concrete and as dispersant. Fluidity of clean solution was improved from 70 to 102 mm.
出处
《林产化学与工业》
EI
CAS
CSCD
北大核心
2009年第2期49-53,共5页
Chemistry and Industry of Forest Products
关键词
超滤
麦草
黑液
木质素
uhrafihration
wheat straw
black liquor
lignin
