竹浆黑液木质素热解油分子尺寸的量子化学计算及其分布特性研究  

Quantum Chemical Calculation of Molecular Size and Distribution Characteristics of Pyrolysis Oil from Bamboo Kraft Lignin

作　　者：邹秋霞 林伟杰 武帅 徐德忠 黄方 ZOU Qiuxia;LIN Weijie;WU Shuai;XU Dezhong;HUANG Fang(College of Material Engineering,Fujian Agriculture and Forestry University,Fuzhou,Fujian Province,350108)

机构地区：[1]福建农林大学材料工程学院,福建福州350108

出　　处：《中国造纸》2022年第8期63-69,共7页China Pulp & Paper

基　　金：国家重点研发计划(2017YFB0307900);国家自然科学基金(22078061);福建省科技厅指导项目(2018H0006);生物基材料与绿色造纸国家重点实验室(齐鲁工业大学)开放基金项目(KF201922)。

摘　　要：黑液木质素主要以生物质制浆造纸过程中的固体残渣形式存在,是一种潜在的生产高价值化学品的原料。本研究采用异核单量子相干核磁共振技术(HSQC-NMR)表征了竹浆黑液木质素和热解重油,并用量子化学计算方法研究了黑液木质素在600℃高温条件下热解油组分的分子尺寸。结果表明,竹浆黑液木质素由G型、S型和H型木质素单元构成,热解油的主要组分为酚类、酮类、醇类和醚类化合物。热解油小分子组分的y维度与动力学直径主要集中在6.5~8.4Å区域。根据量子化学计算结果,木质素催化热解制备高品质液体燃料可选用孔径尺寸在6.5~8.4Å的分子筛催化剂。Black liquor lignin mainly exists in the form of solid residues in the biomass pulping process,is a potential feedstock for the production of high-value chemicals.In this study,heteronuclear single quantum coherence nuclear magnetic resonance(HSQC-NMR)was used to characterize the lignin and pyrolysis heavy oil of bamboo kraft black liquor,and the molecular size of the pyrolysis oil fractions of black liquor lignin at high temperature of 600℃was investigated by quantum chemical calculations.The results showed that the lignin of bamboo kraft black liquor mainly consisted of G-type,S-type and H-type lignin units,and the main components of pyrolysis oil were phenols,ketones,alcohols and ethers.The y-dimension and kinetic diameters of small molecules of pyrolysis oil were mainly concentrated in the region of 6.5~8.4Å.According to quantum chemical calculations,molecular sieve catalysts with pore sizes in the range of 6.5~8.4Å could be used for lignin-catalyzed cracking to prepare high-quality liquid fuels.

关 键 词：黑液木质素 催化热解 热解油 量子化学计算 

分 类 号：TS79[轻工技术与工程—制浆造纸工程]