摘要
以三倍体毛白杨为研究对象,进行了常规和深度脱木素蒸煮,并对纸浆进行OQP漂序的全无氯漂白。分别从原料、KP纸浆、EMCC纸浆、以及其氧脱木素后的半漂浆和全漂浆中分离出原料木素和纸浆残余木素。木素分离采用酶-弱酸解的两段法。采用酸析法从蒸煮黑液中分离出溶出木素样品,经过弱酸水解得到纯的木素试样。通过凝胶渗透色谱(GPC),对所有试样分别进行了分子质量的检测,得出各种木素样品的分子质量及其分布,分析了木素溶出过程中分子质量的变化,并且对KP和EMCC两种纸浆中残余木素的平均分子质量、黑液中溶出木素的平均分子质量进行了对比。
The fast-growing hardwood-Triploid of Polulus Tomentosa was used as the raw material in this re,arch. Conventional Kraft pulping and EMCC cooking, OQP bleaching were carried out. Different lignin samples were isolated from the raw material, KP and EMCC pulps and their oxygen-delignified and bleached pulps respectively. The two stage method of Argyropoulos was chosen as the isolation method for the residual lignin preparation. The acid-precipitating method was use for the dissolved lignin isolation from the black liquor and the crude lignin was purified by mildacidic hydrolysis.All of the lignin samples tested through GPC, and the changes of molecular weight of the lignins in the KP and EMCC pulps were studied and compared.
出处
《中国造纸学报》
EI
CAS
CSCD
2005年第2期43-47,共5页
Transactions of China Pulp and Paper
基金
山东省自然科学基金(Y2003B02)资助项目
