摘要:
Methods for integrating the production of cellulose nanocrystals (CNC) and cellulose nanofibrils (CNF) from cellulose are provided. The methods use milder acid hydrolysis conditions than those for maximal CNC production to achieve reduced degradation of cellulose into soluble sugars. Also provided are negatively charged cellulosic solid residues (CSRs) in the form of cellulose fibers (CF) and/or cellulose microfibrils (CMF) during the acid hydrolysis, as well as CNFs fabricated from the CSRs.
摘要:
Methods for integrating the production of cellulose nanocrystals (CNC) and cellulose nanofibrils (CNF) from cellulose are provided. The methods use milder acid hydrolysis conditions than those for maximal CNC production to achieve reduced degradation of cellulose into soluble sugars. Also provided are negatively charged cellulosic solid residues (CSRs) in the form of cellulose fibers (CF) and/or cellulose microfibrils (CMF) during the acid hydrolysis, as well as CNFs fabricated from the CSRs.
摘要:
A method for oxidative degradation of lignin and polysaccharide fragments dissolved during polyoxometalate delignification or bleaching of wood pulp, wood fiber or pulp obtained from a non-woody plant. The method comprises the steps of obtaining a spent polyoxometalate bleaching solution containing a polyoxometalate of the formula [V.sub.l Mo.sub.m W.sub.n Nb.sub.o Ta.sub.p (TM).sub.q X.sub.r O.sub.s ].sup.x- where 1 is 0-18, m is 0-40, n is 0-40, o is 0-10, p is 0-10, q is 0-9, r is 0-6, TM is a d-electron-containing transition metal ion, and X is a heteroatom which is p or d block element, provided that l+m+n+o+p.gtoreq.4, l+m+q>0 and s is sufficiently large that x>0, and heating the solution in the presence of an oxidant under conditions wherein the dissolved organic compounds are oxidatively degraded to volatile organic compounds and water.
摘要翻译:一种木质素和多糖片段的氧化降解方法,其在多金属氧酸盐脱木质素或从非木本植物获得的木浆,木纤维或纸浆的漂白中溶解。 该方法包括以下步骤:获得含有式[VlMomWnNboTap TM qXrO] x-的多金属氧酸盐的废多金属氧酸盐漂白溶液,其中1为0-18,m为0-40,n为0-40,o为0- 10,p为0-10,q为0-9,r为0-6,TM为含d电子的过渡金属离子,X为p或d为杂原子的嵌段元素,条件是l + m + n + o + p> / = 4,1 + m + q> 0,s足够大,使x> 0,并且在氧化剂存在下加热溶液,其中溶解的有机化合物氧化降解为挥发性 有机化合物和水。