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Probing the molecular weights of sweetgum and pine kraft lignin fractions, TAPPI Journal June 2021
ABSTRACT: The present investigation undertook a systematic investigation of the molecular weight (MW) of kraft lignins throughout the pulping process to establish a correlation between MW and lignin recovery at different extents of the kraft pulping process. The evaluation of MW is crucial for lignin characterization and utilization, since it is known to influence the kinetics of lignin reactivity and its resultant physico-chemical properties. Sweetgum and pine lignins precipitated from black liquor at different pHs (9.5 and 2.5) and different extents of kraft pulping (30•150 min) were the subject of this effort. Gel permeation chromatography (GPC) was used to determine the number average molecular weight (Mn), mass average molecular weight (Mw), and polydispersity of the lignin samples. It was shown that the MW of lignins from both feedstocks follow gel degradation theory; that is, at the onset of the kraft pulping process low molecular weight-lignins were obtained, and as pulping progressed, the molecular weight peaked and subsequently decreased. An important finding was that acetobromination was shown to be a more effective derivatization technique for carbohydrates containing lignins than acetylation, the technique typically used for derivatization of lignin.
Improved Operation of Recovery Boiler Precipitators, 2010 TAPPI/PAPTAC International Chemical Recovery Conference
Improved Operation of Recovery Boiler Precipitators, 2010 TAPPI/PAPTAC International Chemical Recovery Conference
Conference papers
THE DENSITY CHANGE OF BIOMASS DURING COMBUSTION, 2018 PEERS
THE DENSITY CHANGE OF BIOMASS DURING COMBUSTION, 2018 PEERS
Conference papers
Oxygen Delignification Performance, Caustic Soda vs. Unoxidized White Liquor • A Mill Study, 2018 PEERS
Oxygen Delignification Performance, Caustic Soda vs. Unoxidized White Liquor • A Mill Study, 2018 PEERS
Journal articles
Magazine articles
Synthesis of filtrate reducer from biogas residue and its application in drilling fluid, TAPPI Journal March 2020
ABSTRACT: Biogas residues (BR) containing cellulose and lignin are produced with the rapid development of biogas engineering. BR can be used to prepare the filtrate reducer of water-based drilling fluid in oilfields by chemical modification. BR from anaerobically fermenting grain stillage was alkalized and etherified by caustic soda and chloroacetic acid to prepare filtrate reducer, which was named as FBR. The long-chain crystalline polysaccharides were selected as dispersing agents (DA), and the water-soluble silicate was used as the cross-linking agent. After the hot rolling of FBR in saturated saltwater base mud for 16 h at 120°C, the filtration loss was increased from 7.20 mL/30 min before aging to 8.80 mL/30 min after aging. Compared with the commercial filtrate reducers, FBR had better tolerance to high temperature and salt, and lower cost.
Conference papers
THE IMPACT OF UTILIZING THE LEADING EDGE SOOTBLOWER NOZZLE ON RECOVERY BOILER SUPERHEATER PLATENS, 20PEERS Conference
THE IMPACT OF UTILIZING THE LEADING EDGE SOOTBLOWER NOZZLE ON RECOVERY BOILER SUPERHEATER PLATENS, 20PEERS Conference
Conference papers
MILL EXPERIENCE OF CALCIUM CARBONATE SCALE FORMATION IN GREEN LIQUOR HANDLING SYSTEMS, 19PEERS
MILL EXPERIENCE OF CALCIUM CARBONATE SCALE FORMATION IN GREEN LIQUOR HANDLING SYSTEMS, 19PEERS
Conference papers
Development of Kraft Recovery Boilers • What have been the Main Development Steps?, 19PEERS
Development of Kraft Recovery Boilers • What have been the Main Development Steps?, 19PEERS
Journal articles
Magazine articles
Laboratory method for determining the source of brightness loss at a southern United States bleached paperboard mill, TAPPI Journal October 2018
Laboratory method for determining the source of brightness loss at a southern United States bleached paperboard mill, TAPPI Journal October 2018
Conference papers
Using Proven Aerospace Technology to Retard Crack Growth for
Using Proven Aerospace Technology to Retard Crack Growth for Kiln Applications, 2017PEERS