Pyrolysis Behavior of the Black Liquor Derived from Soda–Anthraquinone and Soda–Oxygen Pulping of Rice Straw at Different Reaction End Points

Zhang, Lilong

doi:10.1021/acs.energyfuels.6b01735

Cited by 17 publications

(18 citation statements)

References 27 publications

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“…However, because of the hydrogen-bonding interaction that occurred when the treated straw was air-dried, the loosened tissue collapsed, shrank, and adjacent fibrous bands closed up, and thus, the excessive addition of lye could bring about structural collapse. Unlike pretreatment with moderate NaOH loading (below 14%), after pretreatment with highly concentrated NaOH solution, the straw could not keep its original structure, which has been shown in our previous work [ 17 ].…”

Section: Discussionmentioning

confidence: 86%

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Reinforcement of the bio-gas conversion from pyrolysis of wheat straw by hot caustic pre-extraction

Zhang

Peng

2018

Biotechnol Biofuels

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BackgroundPyrolysis has attracted growing interest as a versatile means to convert biomass into valuable products. Wheat straw has been considered to be a promising biomass resource due to its low price and easy availability. However, most of the products obtained from wheat straw pyrolysis are usually of low quality. Hot soda extraction has the advantage of selective dissolution of lignin whilst retaining the carbohydrates. This can selectively convert biomass into high-quality desired products and suppress the formation of undesirable products. The aim of this study was to investigate the pyrolysis properties of wheat straw under different hot caustic pretreatment conditions.ResultsCompared with the untreated straw, a greater amount of gas was released and fewer residues were retained in the extracted wheat straw, which was caused by an increase in porosity. When the NaOH loading was 14%, the average pore size of the extracted straw increased by 12% and the cumulative pore volume increased by 157% compared with the untreated straw. The extracted straw obtained from the 14% NaOH extraction was clearly selective for pyrolysis products. On one hand, many lignin pyrolysis products disappeared, and only four main lignin-unit-pyrolysis products were retained. On the other hand, polysaccharide pyrolysis products were enriched. Both propanone and furfural have outstanding peak intensities that could account for approximately 30% of the total pyrolysis products. However, with the excessive addition of NaOH (i.e. > 22% w/w) during pretreatment, the conversion of bio-gas products decreased. Thermogravimetric and low-temperature nitrogen-adsorption analysis showed that the pore structure had been seriously destroyed, leading to the closing of the release paths of the bio-gas and thus increasing the re-polymerisation of small bio-gas molecules.ConclusionsAfter suitable extraction (14% NaOH loading extraction), a considerable amount (25%) of the soluble components dissolved out of the straw. This resulted in an increase in both pore size and volume. This condition appeared to be optimally selective for the release of value-added pyrolysis products such as furfural, ketones and lignin monomer units. However, excessive addition of alkali (22%) for extraction could change the original interior structure, resulting in a decrease in both pore size and volume. This interior structure modification limited the release of pyrolysis products, and greater carbonisation occurred. Electronic supplementary materialThe online version of this article (10.1186/s13068-018-1072-5) contains supplementary material, which is available to authorized users.

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Section: Discussionmentioning

confidence: 86%

“…Our previous paper [ 17 ] presented a study of the soda extraction of wheat straw using a wider range of NaOH dosages under low-temperature conditions (90 °C). We found that soda extraction has the advantage of selective dissolution of lignins, whilst carbohydrates were retained.…”

Section: Introductionmentioning

confidence: 99%

Reinforcement of the bio-gas conversion from pyrolysis of wheat straw by hot caustic pre-extraction

Zhang

Peng

2018

Biotechnol Biofuels

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“…After cooking, centrifugation was used to separate BL from the pulp and then washed BL with hot water three times. The detail information was act in accordance with our previous work (Zhang et al 2017).…”

Section: 2preparation Of the Blmentioning

confidence: 99%

“…Thus, the latter is superior to the former in terms of BL features. However, the lack of research on BL characteristics following treatment in a recovery furnace still confused the application on the alkali and energy recovery (Jafari et al 2014;Zhang et al 2017). Investigating the properties of the BL obtained from wheat straw pulping is an important endeavor.…”

Section: Introductionmentioning

confidence: 99%

Synchronous silicon removal and viscosity reduction in the soda-oxygen pulping of wheat straw

Zhang

2021

Cellulose

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The black liquor (BL) obtained by straw pulping can hardly be applied to conventional alkali 11 recovery systems because of its high concentration of silicon and viscosity. Soda-oxygen pulping can synchronously deposit silica on the surface of the cellulose to reduce the silicon content and viscosity of BL remarkably. In this paper, the BLs of wheat straw soda-oxygen puling obtained at different end points (pH < 10, 11.5 < pH < 12) and conventional soda-anthraquinone (soda-AQ) were obtained. The extent of silicon removal and viscosity reduction before and after centrifugation or membrane filtration as well as the thermodynamic properties of the BLs were investigated. Compared with that achieved by soda-AQ, over 45% silicon was removed from BL after soda-oxygen cooking at a similar delignification level. The total solid (TS) concentration of the soda-oxygen BL was easily concentrated by up to approximately 50%. SiO2 can be further removed by simple centrifugation and membrane filtration, and its TS could be increased to 60% at 300 mp•s. With cooking end point further decreased pH <10, the centrifugated BL had the lowest silica content, the highest volumetric isothermal expansivity (VIE) value, and the lowest pyrolysis temperature.

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“…A dissolution process of silica in the alkaline solution can be explained by the formation of silicate. A high silicate content may cause serious silicon scaling during evaporation and concentration of alkali liquor and thus reduces alkali recovery efficiency (Zhang and Chen 2017). According to Xu and Li (2013), when the silicon content is in the range of 0.15% to 0.54%, which is equivalent to the silicon content in wood pulping black liquor, there is no obvious silicon interference.…”

Section: Pretreatment Solution Analysismentioning

confidence: 99%

Pulp properties and spent pretreatment solution resulting from reed pulping with a low alkali loading

Zhao

Tian

Lyu

et al. 2021

BioRes

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Using reed (Phragmites australis (Cav.) Trin. ex Steud) as raw material, straw pulp was prepared by low alkali (less than 6%) pretreatment combined with mechanical grinding. The effects of pretreatment times and alkali dosages on pulp properties and pretreatment solution were investigated. The results demonstrated that alkali pretreatment affected FPI beating efficiency, and the beating energy consumption was lowest when pretreated with alkali dosage of 4%. With 5% NaOH pretreatment, the produced handsheets showed excellent properties that exceeded the requirements of food packaging paper and C-class corrugated paper. Moreover, low silicon content (≤1.12 g/L) in the pretreatment liquor had an almost negligible effect relative to alkali recovery. Therefore, this study is important for researchers and industrial representatives seeking to use reed straw as material for pulping.

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Pyrolysis Behavior of the Black Liquor Derived from Soda–Anthraquinone and Soda–Oxygen Pulping of Rice Straw at Different Reaction End Points

Cited by 17 publications

References 27 publications

Reinforcement of the bio-gas conversion from pyrolysis of wheat straw by hot caustic pre-extraction

Reinforcement of the bio-gas conversion from pyrolysis of wheat straw by hot caustic pre-extraction

Synchronous silicon removal and viscosity reduction in the soda-oxygen pulping of wheat straw

Pulp properties and spent pretreatment solution resulting from reed pulping with a low alkali loading

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