The Purification of Industrial Alkali Lignin with Xylanase

Dai, Lai Xin; Lu, Hong; Zhang, Li Ping

doi:10.4028/www.scientific.net/amr.884-885.598

Cited by 2 publications

(2 citation statements)

References 12 publications

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“…Moreover, another reason may be the extraction of LCC under xylanase pretreatment, which causes part of lignin to degrade. These results are similar with studies of LCC dissolved into effluent after xylanase pretreatment (Dai et al 2014). Figure 3 shows the correlation between xylanase dosage and pulp yield.…”

Section: Ftir and Gc-ms Analysissupporting

confidence: 87%

Xylanase-Aided Chlorine Dioxide Bleaching of Bagasse Pulp to Reduce AOX Formation

et al. 2016

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Xylanase pretreatment was used to improve the chlorine dioxide bleaching of bagasse pulp. The pulp was pretreated with xylanase, which was followed by a chlorine dioxide bleaching stage. The HexA content of the pulp and the AOX content of the bleaching effluent were measured using UV-Vis and GC-MS methods, respectively. The results showed that a good correlation occurred between HexA and kappa number. HexA content of the pulp decreased significantly after the xylanase pretreatment. The AOX content of the bleaching effluent decreased as HexA was removed from the pulp. It was found that AOX could be reduced by up to 29.8%, comparing XD0 with a D0 stage. Fourier transform infrared spectroscopy (FTIR) was employed to determine the breakage of chemical bonds in the pulp. It revealed that some lignin and hemicellulose were removed after xylanase treatment. The GC-MS results showed that some toxic chloride such as 2,4,6-trichlorophenol could be completely removed after xylanase pretreatment.

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Section: Ftir and Gc-ms Analysissupporting

confidence: 87%

Xylanase-Aided Chlorine Dioxide Bleaching of Bagasse Pulp to Reduce AOX Formation

et al. 2016

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“…As an example, Figure 5 shows the FTIR spectra of the initial HL1 compared to its purified fraction via alkaline hydrolysis-acid precipitation using 0.1 M NaOH, initial W lign = 0.03, and T = 25 • C. The carbohydrate bands are indicated in the figure. The signals at 1693 cm −1 and 1269 cm −1 are assigned to the C=O stretching in carbohydrates [36,37], the signal at 1156 cm −1 to the C-O stretching in ester groups in carbohydrates [38], and the 1036 cm −1 to the stretching vibration of ether bond in polysaccharide [39]. In this case, a reduction is observed of the 1036 cm −1 and 1156 cm −1 bands in the purified lignin fraction compared to initial HL1 sample, which corresponds to the elimination of polysaccharides after the alkaline hydrolysis-acid precipitation purification treatment.…”

Section: Alkaline Hydrolysis-acid Precipitation Treatmentmentioning

confidence: 99%

Strategies for the Removal of Polysaccharides from Biorefinery Lignins: Process Optimization and Techno Economic Evaluation

et al. 2021

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The utilization of biorefinery lignins as a renewable resource for the production of bio-based chemicals and materials remain a challenge because of the high polysaccharide content of this variety of lignins. This study provides two simple methods; (i) the alkaline hydrolysis-acid precipitation method and (ii) the acid hydrolysis method for the removal of polysaccharides from polymeric biorefinery lignin samples. Both purification strategies are optimized for two different hardwood hydrolysis lignins, HL1 and HL2, containing 15.1 % and 10.1% of polysaccharides, respectively. The treated lignins are characterized by polysaccharide content, molecular weight, hydroxyl content, and Attenuated Total Reflection-Fourier Transform Infrared Spectroscopy (ATR-FTIR). Preliminary techno-economic calculations are also carried out for both purification processes to assess the economic potential of these technologies. The results indicate that both protocols could be used for the purification of HL1 and HL2 hydrolysis lignins because of the minimal polysaccharide content obtained in the treated lignins. Nevertheless, from an industrial and economic perspective the acid hydrolysis technology using low acid concentrations and high temperatures is favored over the alkaline hydrolysis-acid precipitation strategy.

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The Purification of Industrial Alkali Lignin with Xylanase

Cited by 2 publications

References 12 publications

Xylanase-Aided Chlorine Dioxide Bleaching of Bagasse Pulp to Reduce AOX Formation

Xylanase-Aided Chlorine Dioxide Bleaching of Bagasse Pulp to Reduce AOX Formation

Strategies for the Removal of Polysaccharides from Biorefinery Lignins: Process Optimization and Techno Economic Evaluation

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