BIORESOURCE TECHNOLOGY
·
2017
·
IF 5.651
Zheng Cheng,Rendang Yang,Xu Liu,Xiao Liu,Hua Chen
Herein, bacterial cellulose (BC) was synthesized by acetobacter xylinum via organic acid pre-hydrolysis liquor of agricultural corn stalk used as carbon source. Acetic acid was applied to pretreat the corn stalk, then, the prehydrolysate was detoxified by sequential steps of activated carbon and ion exchange resin treatment prior to use as carbon source to cultivate acetobacter xylinum. Moreover, the recovery of acetic acid was achieved for facilitating the reduction of cost. The results revealed that the combination method of detoxification treatment was very effective for synthesis of BC, yield could be up to 2.86 g/L. SEM analysis showed that the diameter size of BC between 20 and 70 mm. In summary, the process that bacterial cellulose was biosynthesized via prehydrolysate from agricultural corn stalk used as carbon source is feasible, and the ability to recover organic acid make it economical, sustainable and green, which fits well into the biorefinery concept.
研究领域:
生物技术
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环境科学
·
可持续发展
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2019
·
IF 4.191
Yuanfeng Dong,Hairui Ji,Cuihua Dong,Wenyuan Zhu,Zhu Long,Zhiqiang Pang
High-grade dissolving pulp was prepared from radiata pine by the pre-hydrolysis Kraft process. The effect of the P-factor in the pre-hydrolysis stage on the properties of wood chips was investigated. With an increasing P-factor, hemicellulose was selectively removed from wood chips, and the crystallized index of the pre-hydrolyzed wood chips increased owing to the dissolution of the amorphous phase in the substrates. Further, sugars in hemicellulose could be rapidly hydrolyzed; whereas, their release became slower with a further increase in the P-factor. Comparatively, arabinose and galactose were readily removed during pre-hydrolysis for its accessibility. Additionally, accumulations of furfural and 5-hydroxymethylfurfural (HMF) were detected via acid-catalyzed dehydration of pentose and hexose, respectively. HMF can be further converted into formic and levulinic acid by acid-catalyzed dehydration. After pre-hydrolysis, the chips were subjected to Kraft cooking, and the optimal P-factor (480) for the production of dissolving pulp and the optimal H-factor (1500) in terms of the Kappa number, viscosity, and α-cellulose of the pulp were obtained. Then, the Kraft pulp was bleached using the (OO)D 0 E OP D 1 D 2 sequence, and a final ISO brightness of 91.0% was achieved with negligible loss in α-cellulose. The described technique and parameters are important for the industrial production of high-grade dissolving pulp using radiata pine.
研究领域:
林业工程
·
制浆造纸科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Minjie Hou,Leiming Wang,Yanning Sun,Yanzhu Guo,Xueru Sheng,Fengshan Zhang,Haidong Sun,Pedram Fatehi,Haiqiang Shi
Generally, lignin separation from prehydrolysis liquor (PHL) is accompanied by sugar removal, making the purification of PHL challenging. However, how sugar loss from PHL can be minimized in PHL purification is still unclear. In this work, a method for removing lignin from PHL was attested, which included treatments of PHL with poly aluminum chloride (PAC), activated carbon, and XAD-4 resin. The results exhibited that the PAC could form complexation with lignin facilitating lignin removal from PHL. At the PAC concentration of 15 mg/L, 10% of lignin was removed, while no significant sugar loss was observed. Subsequently, by treating PHL with activated carbon, 87% of the remaining lignin was removed from the PHL, while sugar loss was identified to be 14%. XAD-4 resin treatment could slightly improve the lignin removal from 87% to 92%. However, the XAD-4 was unselective in sugar removal and led to an increased sugar loss (from 14% to 37%). Interestingly, removing colloidal lignin by PAC benefited the subsequent activated carbon process for improving lignin removal. In other words, PAC removed not only colloidal lignin but also facilities lignin isolation (i.e., an increase from 81% to 87%) and prohibited sugar loss (a drop from 27% to 6%) in the subsequent activated carbon treatment.
研究领域:
生物质转化
·
制浆化学
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分离纯化
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碳水化合物化学
·
环境工程
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2023
·
IF 7
Minjie Hou,Leiming Wang,Qinuo Ma,Tianyuan Xiao,Yanning Sun,Yanzhu Guo,Xueru Sheng,Ling-Ping Xiao,Fengshan Zhang,Pedram Fatehi,Haiqiang Shi
Pre-hydrolysis liquor (PHL) of the dissolved pulp production process contains sugar and lignin is paper-making wastewater. Although sugar has the potential for value-added applications, the presence of lignin is problematic for the utilization of PHL. To improve the removal of lignin and maintain a high concentration of sugars in PHL, a novel process was introduced that included a dilute acid treatment, activated carbon (AC), and resin treatment of PHL, respectively. The results confirmed that most of the colloidal lignin and part of dissolved lignin were removed by dilute acid post-hydrolysis and the bonds of lignin-carbohydrate complexes were broken, and the adsorption efficiency of AC and resin was improved. In addition, the research found that high temperature can improve the adsorption efficiency of lignin on AC. In the case of without using PAC, the dilute acid treatment can reduce the dosage of AC from 25 g/L to 12.5 g/L and improve the flow rate of PHL through the resin from 0.1 mL/s to 0.8 mL/s in removing lignin to 90 %, while maintaining sugars in PHL. Also, the particle size of the PHL was significantly reduced by dilute acid-post hydrolysis which is probably because of the broken of β-O-4 aryl ether bond of lignin in PHL indicated by the analysis of 2D-HSQC. This work provides a practical technical process for industrial application of PHL and production of sugar solutions (mainly xylose) with high purity.
研究领域:
生物化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Minjie Hou,Leiming Wang,Chenfeng Yang,Tianyuan Xiao,Yanning Sun,Yanzhu Guo,Xueru Sheng,Jie Lu,Fengshan Zhang,Pedram Fatehi,Haiqiang Shi
This paper proposed a novel xylanase-assisted activated carbon process to produce a high-purity sugar stream from pre-hydrolysis liquid (PHL) of the kraft-based dissolving pulp production process. The results showed that the enzymatic hydrolysis could effectively improve the lignin removal and sugar purity at pH 5 and 50 °C. It was observed that the cleavage of lignin-carbohydrate complex (LCC) by enzyme led to more sugar and soluble lignin production in PHL. The main mechanisms involved are the reduced pore clog due to the lignin converted from colloidal to dissolved state at higher pH, lower sugar loss obtained by the reduction of polymerization degree of poly-sugars in PHL and also the removal of the lignin disconnected from the LCC. FTIR NMR, particle size, BET, and SEM analyses confirmed that the induced soluble lignin could be adsorbed by activated carbon effectively without blocking its pores, which improved the selectivity and productivity of activated carbon for removing lignin and generating higher purity sugar stream (97.5 wt. %). Based on the promising results and simplicity of the proposed operations, the introduced process may be attractive to the industry for generating high-purity sugars at an industrial scale.
研究领域:
生物技术
·
制浆造纸工程
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2016
·
IF 4.917
Cheng Cai,Xueqing Qiu,Xuliang Lin,Hongming Lou,Yuxia Pang,Dongjie Yang,Siwei Chen,Kaifan Cai
Two pretreatment methods to overcome recalcitrance of lignocelluloses, sulfite pretreatment (SPORL) and dilute acid (DA), were conducted to pretreat softwood masson pine and hardwood eucalyptus for enzymatic hydrolysis. In the presence of corresponding pre-hydrolysates, adding moderate cetyltrimethylammonium bromide (CTAB) could enhance the enzymatic hydrolysis of the SPORL-pretreated substrates, but had no enhancement for the DA-pretreated substrates. The results showed that sodium lignosulfonate (SL) in pre-hydrolysates and CTAB together had a strong enhancement on the enzymatic hydrolysis of lignocelluloses. The compound of commercial lignosulfonate SXSL and CTAB (SXSL-CTAB) could enhance the substrate enzymatic digestibility (SED) of SPORL-pretreated masson pine from 27.1% to 71.0%, and that of DA-pretreated eucalyptus from 37.6% to 67.9%. The mechanism that CTAB increased the adsorption of SL on lignin to form more effective steric hindrance and reduced the non-productive adsorption of cellulase on lignin by neutralizing the negative charge of SL was proposed.
研究领域:
生物化学
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生物技术
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 26
·12323-12333
·
IF 9.931
Yangyi Sun,Min Chen,Limin Wu
Hollow periodic mesoporous organosilica spheres (HPMOSs) have some important special applications owing to their unique properties, but current syntheses usually involve various template methods that are time-consuming. Herein, we report a highly efficient and controllable synthesis of HPMOSs with radial mesochannels, only through introducing a pre-hydrolysis process to the commercially available bissilylated organosilanes (R′O)3Si–R–Si(OR′)3 with CTAB. The HPMOSs are robust with a mean diameter as small as 45 nm and a shell thickness as thin as 14 nm. A cytotoxicity assay indicates that the obtained HPMOSs possess good biocompatibility, and the HPMOSs with thioether groups are degradable under a 10 mM glutathione microenvironment. The amphiphilic organosilica precursors derived from the pre-hydrolysis process, CTAB micelles, and ethanol contribute to the formation of the HPMOSs.
研究领域:
材料科学
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纳米技术
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化学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）