Preparation and evaluation of a dispersant for gypsum paste from acid hydrolysis lignin

2005 ◽  
Vol 98 (6) ◽  
pp. 2508-2513 ◽  
Author(s):  
Yasuyuki Matsushita ◽  
Masanori Imai ◽  
Takashi Tamura ◽  
Kazuhiko Fukushima
Keyword(s):  
Acid Hydrolysis ◽  
Hydrolysis Lignin ◽  
Acid Hydrolysis Lignin ◽  
Preparation And Evaluation

Acid Hydrolysis Lignin as a Sorbent for Naphthalene

2001 ◽  
Vol 36 (4) ◽  
pp. 719-735 ◽  
Author(s):  
Angela Keane ◽  
Subhasis Ghoshal
Keyword(s):  
Organic Matter ◽  
Acid Hydrolysis ◽  
Waste Product ◽  
Freundlich Isotherm ◽  
Packed Bed ◽  
Hydrolysis Lignin ◽  
Sorptive Capacity ◽  
Sorption Data ◽  
Large Pressure ◽  
Acid Hydrolysis Lignin

Abstract Lignin, a major polymeric constituent of woody plant tissue, is an abundant source of natural organic matter available as a waste product from the pulp and paper and the fuel ethanol industries. In this study, the sorptive capacity of acid hydrolysis lignin for naphthalene, a representative nonpolar hydrophobic organic compound (HOC), was investigated. When powdered lignin is mixed with distilled water, dissolved and/or colloidal organic matter leaches into the aqueous phase imparting a cloudy yellowish colour. A washing and filtering protocol was developed for pretreating the lignin employed in the sorption studies. Results from batch sorption experiments showed that acid hydrolysis lignin has a strong affinity for naphthalene. The Freundlich isotherm coefficients obtained indicate that the sorption isotherm for naphthalene on hydrolysis lignin is nearly linear. A modified Freundlich equation was employed in order to compare sorption data for HOCs on lignin and activated carbon through the use of unit equivalent coefficients. The results presented in this research and in the literature suggest that the two sorbents are comparable in terms of sorption coefficients. It was determined that acid hydrolysis lignin is unsuitable for use in a packed bed since pumping a naphthalene solution through a column packed with lignin caused the wet lignin to become significantly hardened over time, resulting in a large pressure drop across the system.

Study of Structure of Industrial Acid Hydrolysis Lignin, Oxidized in the H2O2-H2SO4System

2016 ◽  
Vol 36 (4) ◽  
pp. 259-269 ◽  
Author(s):  
Edward I. Evstigneyev ◽  
Oleg S. Yuzikhin ◽  
Andrey A. Gurinov ◽  
Alexandr Yu. Ivanov ◽  
Tatiana O. Artamonova ◽  
...  
Keyword(s):  
Acid Hydrolysis ◽  
Hydrolysis Lignin ◽  
Acid Hydrolysis Lignin

scholarly journals Toward valorization of lignin: characterization and fast pyrolysis of lignin recovered from hot-water extracts of electron-beam irradiated sugar maple

TAPPI Journal ◽  
2017 ◽  
Vol 16 (04) ◽  
pp. 213-226 ◽  
Author(s):  
Derek Corbett ◽  
Ofei Mante ◽  
Biljana Bujanovic
Keyword(s):  
Electron Beam ◽  
Acid Hydrolysis ◽  
Sugar Maple ◽  
Fast Pyrolysis ◽  
Hot Water ◽  
Hydrolysis Lignin ◽  
Dilute Acid ◽  
Dilute Acid Hydrolysis ◽  
Lignin Removal ◽  
Acid Hydrolysis Lignin

This paper provides an analysis of lignin-rich (>80%) solids recovered as a byproduct of hot-water extraction (HWE) pretreatment performed on sugar maple (Acer saccharum) (autohydrolysis at 160ºC for 2 h). The effects of electron beam irradiation (EBI) pretreatment before HWE were assessed with regard to lignin removal during HWE and selected features of the recovered lignin. The results of catalytic fast pyrolysis – gas chromatography-mass spectrometry (Py-GCMS) are also discussed. EBI of sugar maple increased lignin removal (delignification) during subsequent HWE; however, recovery of dissolved lignin and lignin degradation products from the hot water extract was hindered. Variation of EBI energy dosages before HWE had little effect on lignin recovered from extracts, except for a slightly reduced molecular weight, as evidenced by size exclusion chromatography. The recovered lignin was hypothesized to have advantages for Py-GCMS compared with common technical lignins, such as kraft or dilute acid hydrolysis lignin, because of lower ash and sulfur content and fewer condensed structures (i.e., increased reactivity). The Py-GCMS results showed that the hot water-extracted ligninrich samples produced less residual char than kraft and commercial dilute acid hydrolysis lignin samples; however, yields to simple phenols were reduced compared with kraft lignin results, mostly because of the high syringyl-unit content of the hardwood-derived lignin.

Hydrothermal Liquefaction of Concentrated Acid Hydrolysis Lignin in a Bench-Scale Continuous Stirred Tank Reactor

2019 ◽  
Vol 33 (7) ◽  
pp. 6421-6428 ◽  
Author(s):  
Ivan Kristianto ◽  
Susan Olivia Limarta ◽  
Young-Kwon Park ◽  
Jeong-Myeong Ha ◽  
Dong Jin Suh ◽  
...  
Keyword(s):  
Acid Hydrolysis ◽  
Hydrothermal Liquefaction ◽  
Stirred Tank ◽  
Hydrolysis Lignin ◽  
Continuous Stirred Tank Reactor ◽  
Stirred Tank Reactor ◽  
Tank Reactor ◽  
Bench Scale ◽  
Continuous Stirred Tank ◽  
Acid Hydrolysis Lignin
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