title: Mechanism on microwave-assisted acidic solvolysis of black-liquor lignin.
abstract: Microwave-assisted degradation of black-liquor lignin with formic acid was studied, concerning the product yield and distribution of phenolic compounds against reaction temperature (110-180°C) and reaction time (5-90 min). The liquid product consisting of bio-oil 1 and bio-oil 2, achieved the maxima yield of 64.08% at 160°C and 30 min (bio-oil 1: 9.69% and bio-oil 2: 54.39%). The chemical information of bio-oil 1 and bio-oil 2 were respectively identified by means of Gas Chromatography-Mass Spectrometer (GC-MS) and Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS), while the solid residue was analyzed by Gel Permeation Chromatography (GPC) and Fourier Transform Infrared Spectroscopy (FTIR). A possible mechanism was proposed for the microwave-assisted acidic solvolysis of lignin, specifying the kinetic relationship among the primary cracking of lignin, repolymerization of the oligomers and formation of solid residue.
authors.affiliation: Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China.
authors.forename: Chengjian
authors.initials: C
authors.lastname: Dong
authors.affiliation: Department of Operation (#2), China National Nuclear Power Co., Ltd (CNNP), Haiyan 314300, China.
authors.forename: Chunguang
authors.initials: C
authors.lastname: Feng
authors.affiliation: Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Liu
authors.affiliation: Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China. Electronic address: 101011398@seu.edu.cn.
authors.forename: Dekui
authors.initials: D
authors.lastname: Shen
authors.affiliation: Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China.
authors.forename: Rui
authors.initials: R
authors.lastname: Xiao
mesh_terms: D000143:Acids / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry; D007220:Industrial Waste; D008031:Lignin / Q000737:chemistry*; D008872:Microwaves; D008970:Molecular Weight; D010636:Phenols / Q000032:analysis; D012997:Solvents / Q000737:chemistry*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D000143:Acids; D007220:Industrial Waste; D010636:Phenols; D012997:Solvents; D008031:Lignin
keywords: Lignin; Microwave heating; Oligomer; Phenolic compounds