水-乙醇中碱木质素的催化解聚  

Catalytic Depolymerization of Kraft Lignin in Water-Ethanol Mixture

作　　者：郝文月[1] 马小垒[1] 马睿[1] 田野[1] 

机构地区：[1]天津市应用催化科学与工程重点实验室,天津大学化工学院,天津300072

出　　处：《精细化工》2014年第9期1145-1149,1176,共6页Fine Chemicals

基　　金：天津市自然科学基金(12JCYBJC14000)~~

摘　　要：通过元素分析仪和X射线荧光光谱对碱木质素组成进行了分析。在水-乙醇〔V(水)∶V(乙醇)=50∶50〕溶剂中280℃,2 MPa初始氢压下降解碱木质素。利用傅里叶变换红外光谱(FTIR)对反应前后碱木质素结构进行了表征,反应后醚键减少,碳氢键增加。利用凝胶渗透色谱对二氯甲烷可溶产物进行了分析。利用气相色谱-质谱联用仪(GC-MS)和配有氢火焰离子化检测器的气相色谱(GC-FID)对单体产物进行定性定量分析,无催化剂时单酚收率为4.57%。磷化镍催化剂的加入可使单酚收率翻倍,磷化钼作为催化剂时单酚收率与磷化镍作为催化剂时相似,但出现苯甲醇类物质和大量的直链含氧有机物,单酚质量分数很低。Elemental analyzer and X-ray fluorescence analysis were used to investigate the elemental component of Kraft lignin which was depolymerized in valorized water-ethanol mixture 〔V（ water） ∶ V（ ethanol） =50∶50〕at 280 ℃ with 2 MPa initial H2 pressure. FTIR was used for the analysis of the structure of Kraft lignin before and after reaction,and the results show that ether bond decreased while C—H bond increased after reaction. Gel permeation chromatography was used for the analysis of CH2Cl2 solvable products. The monomer products were qualitatively and quantitatively analyzed with GC-MS and GC-FID,respectively. The total yield of monophenols was 4. 57% without catalyst. The introduction of Ni2 P doubled the monophenols＇ yield. When MoP was used as catalyst,the yield of monophenols was similar to that obtained through Ni2 P catalyzed process. However,benzyl alcohols and considerable amount of linear oxygen-containing organics were observed,leading to decrease of monophenols＇ selectivity.

关 键 词：碱木质素 水-乙醇 催化 NI2P MOP 精细化工中间体 

分 类 号：TS79[轻工技术与工程—制浆造纸工程]