CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2015
·
IF 1.098
Guo Lin,Qiang Zhuang,Qun Cui,Haiyan Wang,Huqing Yao
Co-crystalline zeolite FAU/LTA-0 was synthesized by hydrothermal method from lithium slag. To make the most of excess silicon and alkali sources in mother liquid derived from FAU/LTA-0, zeolite FAU/LTA-1b was synthesized in the same method with the use of mother liquid by adding a certain amount of aluminum source. Influences of different adding ways of aluminum source and recycling dosages of mother liquid on synthesis of zeolites FAU/LTA with mother liquid were investigated. The phase, microstructure and thermostability of FAU/LTA-0 and FAU/LTA-1b were characterized by XRD , SEM and TG-DTA. The calcium and magnesium cation exchange capacities (CECs) of the zeolites were determined. The results have shown that co-crystalline zeolite can be synthesized with the use of mother liquid by adding aluminum source after 2 h of reaction. Compared with FAU/LTA-0, the crystal twinning structure of FAU/LTA-1b became weaker, the grain size was smaller, and the thermostability was better. With a lower dosage of mother liquid, the content of P-type impurity in product decreased significantly, and the content of LTA phase increased. The reuse rate of mother liquid can reach 48%. The CECs of FAU/LTA-1b-150 can reach 343 mg CaCO 3 ·g − 1 and 180 mg MgCO 3 ·g − 1 , showing more excellent adsorption capacities than FAU/LTA-0 and commercial zeolite 4A. The full recycling use of mother liquid to synthesize zeolite FAU/LTA which can be applied for detergent not only improves resource utilization but also reduces production cost.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
CRYSTAL RESEARCH AND TECHNOLOGY
·
2018
·Vol. 53
·期 4
·1700225
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IF 1.122
Xin Liu,Yaping Dong,Xueying Nai,Ming Wei,Wu Li
Zinc borate mother solution is cycled to prepare 2ZnO·3B 2 O 3 ·7H 2 O, 3ZnO·5B 2 O 3 ·14H 2 O, and 4ZnO·B 2 O 3 ·H 2 O based on the properties of borate depolymerization. The results show uniform quadrilateral-prism-like and octahedron-like 2ZnO·3B 2 O 3 ·7H 2 O are synthesized at different temperatures. Flake-like 3ZnO·5B 2 O 3 ·14H 2 O is fabricated as reaction time prolonging, and 2ZnO·3B 2 O 3 ·7H 2 O changed into 3ZnO·5B 2 O 3 ·14H 2 O spontaneously. Meanwhile, resulting 2ZnO·3B 2 O 3 ·7H 2 O is investigated to fabricate high aspect ratio of 4ZnO·B 2 O 3 ·H 2 O whisker. Impressively, uniform 4ZnO·B 2 O 3 ·H 2 O whisker can be resynthesized by the filtrates of 2ZnO·3B 2 O 3 ·7H 2 O and 3ZnO·5B 2 O 3 ·14H 2 O via the zero-waste technology.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Wang Chen,Xiaowei Li,Linlin Chen,Guolang Zhou,Qingqiang Lu,Yan Huang,Yanhong Chao,Wenshuai Zhu
Recovering Li + from the mother liquor obtained during the process of Li 2 CO 3 production has been considered as a promising solution to the shortage of lithium resources. However, as the mother liquor is a complex saline system with high concentration of Li + (1.42 g/L) and a large amount of Na + (55.62 g/L), there is no competent method to carry out for the effective utilization of Li + . This work reports a class of hydrophobic deep eutectic solvents (HDESs) formed by tetrabutylammonium chloride (TBAC) and oleic acid (OA), which is a novel co-extraction reagent for Li + extraction. In addition, tributyl phosphate (TBP) is used as extractant and ammonia is applied to regulate pH. TBAC/3OA showed the highest extraction efficiency in single extraction (76.8%) with the ammonia concentration, the volume ratio of organic phase and aqueous phase (O/A phase ratio), and volume fraction of HDES as 1.5 mol/L, 1, and 30%, respectively. Mechanism studies through the UV–vis and FT-IR proved that cation exchange between Li + and HDES, and Li + coordination was the dominant force in the separation process. The complexing ability of P = O in TBP led to the selective extraction of Li + . The reusability experiments of organic phase demonstrated that the extraction efficiency was still above 60% after five cycles, indicating the favorable stability of the extraction system. Finally, the separation factor ( β Li/Na ) of Li/Na in the mother liquor was 20.5, indicating that the TBP-HDES system has the capability to selectively extract Li + with high Na/Li ratio. This will help to design possible green HDES for lithium recovery.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Linli Chen,Rujie Li,Yangyang Wang,Yi Jing,Shanxu Han,Zhongqi Ren,Zhiyong Zhou
Lithium precipitation mother liquor produced during the lithium precipitation process is a typical solution with a high Na/Li ratio. In this work, the dibenzoylmethane (DBM) and triisobutyl phosphate (TIBP) extraction system after saponification with sodium hydroxide was used to selectively recover lithium ions from lithium precipitation mother liquor. Under optimal extraction conditions, the single-stage extraction efficiency of lithium ions reached up to 95%, and the mass ratio of Na to Li decreased from 36 in aqueous solution to 0.7 in the extractant. After washing with ammonium chloride and lithium chloride, the washing efficiency of sodium ions reached up to 98.9% without the loss of lithium ions. The stripping efficiency of lithium ions was 99.6% by three-stage stripping processes with ammonium carbonate, and battery-grade lithium carbonate could be directly prepared by evaporation of the stripping solution, leading to no production of lithium precipitation mother liquor again. Finally, the selective extraction mechanism of DBM-TIBP extraction system was explored by FT-IR and 31P NMR characterizations.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2019
·
IF 4.182
Yunpeng Hu,Chencan Du,Tao Wang,Guangsheng Luo
In this work, a highly efficient synthetic route for TS-1 zeolites has been developed in a flow system, a greener preparation method is further proposed by recycling the mother liquid. The prepared TS-1 by recycling the mother liquid contained no extraframework Ti species with uniform size and high crystallization as well as excellent catalytic performance for cyclohexanone ammoximation in the flow system containing a tubular reactor and an autoclave. As the fast heating rate of flow chemical process, the crystallization time was shortened to 20 min at 175 °C. Due to the short crystallization, hardly TPAOH participated in the Hofmann elimination reaction except for the structure-directing usage. The full recycle of remained TPAOH in the mother liquid was reused after being concentrated via vacuum distillation, and this novel recycling technology could have 98.5% TPAOH utilization as well as 98.3% TS-1 yield. These results indicate that the flow chemical process plays a key role in the new greener approach for the TS-1 synthesis.
研究领域:
化学工程
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催化材料
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2021
·
IF 6.165
Licheng Zhang,Jinfeng Li,Lianmin Ji,Lijuan Li
Deep eutectic solvent (DES) is gaining much attention as a sustainable and green solvent for chemical separation. This work proposed a series of β-diketone based DES composed by benzoyl trifluoroacetone as hydrogen donor and compounds with different functional group as hydrogen acceptors. The newly prepared DES presented much higher lithium capacity than the conventional solvent extraction system. Due to the strong electron donating nature of phosphine oxide and hydrophobicity of longer carbon chains, TRPO and HBTA with molar ratio of 1/1 showed the best performance for lithium extraction efficiency and separation effect over sodium. The single crystal of the complex formed by lithium and diketone was obtained for the first time, and the stoichiometry of complex formed by HBTA/TRPO-DES and alkali metal was determined to be 1:1:1 by single crystal X-ray diffraction. The synthesized HBTA/TRPO-DES was used to recover lithium from mother liquor of lithium carbonate which was a complex solution with high molar ratio of Na/Li, the extraction of lithium at O/A = 1/3 could reach 90%, and the separation factor of Li/Na was 335 under that condition. After scrubbing and stripping, the DES could be used to next extraction cycle, and the extraction ability remained practically constant. The present work may provide a novel way for lithium recovery from alkaline solutions.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Jiayu Li,Lin Zhang,Haiyan Wang,Qun Cui
The post-Li 2 CO 3 precipitation liquor (the residual raffinate after Li 2 CO 3 precipitation with pH of 10–12), referred to as the mother liquor, still contains 20 ∼ 25 % of unrecovered Li + . Efficiently extracting lithium ions from the mother liquor has become one of the key challenges to enterprises. A titanium-based ion sieve precursor (LTO-Co/CTAB) was prepared via simultaneous doping of cobalt (II) acetate tetrahydrate ((CH 3 COO) 2 Co·4H 2 O) and cetyltrimethylammonium bromide (CTAB) by solid-phase synthesis method. After acid washing of LTO-Co/CTAB, the Co/CTAB co-doped titanium-based ion sieve (HTO-Co/CTAB) was characterized by XRD, SEM, XPS, etc. Adsorption isotherms and kinetics of Li + on HTO-Co/CTAB, along with its Li + /Na + and Li + /K + separation selectivity in the mother liquor were investigated. The results showed that the solid-phase Co doping coupled with CTAB-assisted dispersion enabled successful nano-scale refinement and functional modification of HTO-Co/CTAB. The formation of Co-O-Ti bonds, lattice distortions and its short diffusion paths of nanoparticles (100–200 nm) were all beneficial for the diffusion and enrichment of Li + within the channels of HTO-Co/CTAB. The adsorption behavior of Li + on HTO-Co/CTAB was well-described by Langmuir isotherm adsorption model ( R 2 = 0.996) and pseudo-second-order kinetic model ( R 2 = 0.996). An equilibrium uptake capacity of HTO-Co/CTAB for Li + in the mother liquor (initial concentration of Li + , Na + and K + was 1450, 33,800 and 6900 mg/L) could reach 39.78 mg/g, which was 39 % higher than that of HTO, and the equilibrium time was shortened to 5 h compared to HTO (20 h). The separation factors of Li + /Na + and Li + /K + for HTO-Co/CTAB were 677.45 and 284.43, respectively, and it had excellent stability.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Jun Yang,Ya-Xi Huang,Yuanming Pan,Jin-Xiao Mi
Researches on zeolite silicalite-1 have focused mainly on improving its performance, with little attention paid on green and economic synthesis. Herein, a novel route for green synthesis of pure silicalite-1 from the recycled mother liquor has been developed. This route starts from the hydrothermal reaction of natural quartz with NaOH to form a sodium silicate solution, which is then transformed into a silicic acid (H 2 SiO 3 ) gel by hydrochloric acid titration. Then the solid silicic acid (H 2 SiO 3 ) gel and fumed silica (SiO 2 ) are mixed with water under stirring to form a highly active slurry, which can be hydrothermally “dissolved” in a dilute NaOH aqueous solution. Using this slurry with a high SiO 2 /Na 2 O molar ratio of 5 : 1 as the silica source as well as tetrapropylammonium bromide (TPABr) as the organic template, MFI-type pure silicalite-1 has been successfully synthesized. After each synthesis, the mother liquor of centrifuged supernatant was recovered and recycled. The silica source and organic template were added to the recycled mother liquors for the synthesis of pure silicalite-1. The minimum TPABr/SiO 2 molar ratio needed to synthesize pure silicalite-1 in the initial run is 0.04 : 1. In comparison, only half the amount of the organic template is needed in subsequent runs with the recovered mother liquors. Through recycling, all reactants in the mother liquors were ultimately utilized without any waste, leading to not only effectively reducing the cost of silicalite-1 synthesis but also minimizing its environmental impact.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jiaqi Yao,Yue Sun,Peixin Shi,Yan Liu
Glyphosate is the most widely used herbicide in the world, and a large amount of mother liquor with high salinity is generated during the production of glyphosate by glycine-dimethylphosphite process. In this study, an efficient and environmentally friendly bipolar membrane electrodialysis (BMED) technology was employed for the resource recovery especially phosphorous acid from glyphosate mother liquor. Simulated wastewater as feed solution was initially employed to investigate the migration of phosphite ions in BMED process. The influences of initial pH, salt concentration of feed solution, current density and flow velocity were investigated. The results revealed that phosphites ions could effectively migrate through the anion exchange membrane at pH ≥ 9, with optimal current density of 30 mA/cm 2 and flow velocity of 2.48 cm/s, respectively. It substantiated that the migration of phosphite ions during BMED process was mainly controlled by its degree of protonation, which was influenced by the solution pH. Consequently, a two-stage BMED operation was designed to separate phosphite ions from mixed NaCl and Na 2 HPO 3 solution. The separation efficiency S B A was −84.4 % at end of the first stage and changed to 42.9 % in the second stage. Finally, real glyphosate mother liquor was employed as the feed solution to verify the performance of the two-stage BMED process, and results revealed that the two-stage operation could effectively separate phosphite ions from mixed salt solution. Two-stage operation possessed higher current efficiency and lower energy consumption than those of one-stage operation. In addition, only 0.9 % glyphosate leaked from the feed solution to acid and base solution, thus the products recovered from glyphosate mother liquor could be further processed to recycle in the production of glyphosate. These findings indicated that the two-stage BMED operation had great potential to recover resource from glyphosate mother liquor.
研究领域:
环境科学
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化工技术
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产品关联
DOI
高影响因子
Nano Research
·
2021
·Vol. 14
·期 11
·4304-4313
·
IF 8.897
Zhai Yi,Wang Fumin,Zhang Xubin,Lv Guojun,Wu Yuzhou,Jiang Tao,Zhang Qing,Li Mengyue,Li Mengyao,Liu Yongkui
How to directionally design the hollow zeolite via a green route is of great significance. Here, we successfully synthesized the hollow Fe-silicate-1 encapsulated ultra-small Fe 2 O 3 nanoparticles (2.5 nm) with higher yield (85.2%) by mother liquid than traditional dissolution-recrystallization for the first time, which was achieved by precisely regulating the number and distribution of defects in zeolite and cleverly utilizing the TPAOH and nuclei in mother liquor. The effects of synthetic temperature, synthetic period and addition amount of parent zeolite on the formation of hollow zeolite have been investigated and the effect of synthetic conditions on the defects in parent zeolite has been also firstly quantified. The corresponding formation mechanism has been proposed. The abundant inner defects provided by the zeolite synthesized at 130 °C for 1 day and large amount of TPAOH remaining in mother liquid are conducive to the formation of hollow zeolite. Meanwhile, both parent zeolite and nuclei (4-, 5-member rings and structure units) in mother liquid obtained at 130 °C play the crucial roles in enhancing the zeolite yield. Notably, Fe 2 O 3 nanoparticles could decompose into small fragments by the interaction with nuclei in mother liquid. Partial ultra-small Fe 2 O 3 nanoparticles would be encapsulated in cavity and the rest could be inserted in the zeolite framework, which is significantly different from the conventional dissolution-recrystallization mechanism. The obtained encapsulated catalyst shows the superior catalytic performance and stability in phenol and tetracycline degradation reactions.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2024
·
IF 3.1
Yuan Dongxu,Liu Bingbing,Jiang Lin,Chen Yuhuan,Xu Gang,Lin Jianping,Yang Lirong,Lian Jiazhang,Jiang Yiqi,Ye Lidan,Wu Mianbin
Xylitol is a polyol widely used in food, pharmaceuticals, and light industries. It is currently produced through the chemical catalytic hydrogenation of xylose and generates xylose mother liquor as a substantial byproduct in the procedure of xylose extraction. If xylose mother liquor could also be efficiently bioconverted to xylitol, the greenness and atom economy of xylitol production would be largely improved. However, xylose mother liquor contains a mixture of glucose, xylose, and arabinose, raising the issue of carbon catabolic repression in its utilization by microbial conversion. Targeting this challenge, the transcriptional activator XylR was overexpressed in a previously constructed xylitol-producing E. coli strain CPH. The resulting strain CPHR produced 16.61 g/L of xylitol in shake-flask cultures from the mixture of corn cob hydrolysate and xylose mother liquor (1:1, v/v) with a xylose conversion rate of 90.1%, which were 2.23 and 2.15 times higher than the starting strain, respectively. Furthermore, XylR overexpression upregulated the expression levels of xylE , xylF , xylG , and xylH genes by 2.08–2.72 times in arabinose-containing medium, suggesting the alleviation of transcriptional repression of xylose transport genes by arabinose. This work lays the foundation for xylitol bioproduction from xylose mother liquor.
研究领域:
微生物学
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生物技术
·
代谢工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Ruzhen Zhao,Ziwen Ying,Hao Sun,Qifeng Wei,Xiulian Ren
Lithium extraction has become a hot topic because of global efforts to control carbon emissions. However, the efficient separation of Li/Na is a great challenge. In this study, the lithium carbonate precipitation mother liquor with Li + content of 1.7910 g/L and Na + content of 111.2438 g/L was used as the raw material solution. Due to its high Na/Li ratio, we found that the affinity of nonylphenol oxygen anion with Li + is stronger than that with Na + through quantum chemical analysis. And through the optimization of the effects of saponification degree, pH, temperature, and phase ratio, after twelve rounds of a five-stage countercurrent extraction, the E Li (%) reached 99% and the maximum β Li/Na reached 114799.73. After scrubbing with 0.5 mol/L HCl + 0.5 g/L LiCl solution and stripping with 2 mol/L HCl solution, Li + and Na + could be effectively separated. This study proved that nonylphenol oxygen anion had a significant effect on the extraction of Li + , and could effectively separate Li + from Na + , which brings a new idea for the treatment of high Na/Li solution.
研究领域:
化学工程
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材料科学
✓ 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）