JOM
·
2018
·Vol. 70
·期 4
·581-586
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IF 2.145
Liao Yulong,Zhao Zhongwei
Tungsten was recovered from sulfuric–phosphoric acid leach solution of scheelite using 2-octanol and tributyl phosphate (TBP). Approximately 76% of the tungsten and less than 6.2% of the iron were extracted when using 70% 2-octanol, showing good selectivity for tungsten over iron; the tungsten extraction could not be significantly enhanced using a three-stage countercurrent simulation test. Moreover, more than 99.2% of the W and 91.0% of the Fe were extracted when using 70% TBP, showing poor selectivity, but after pretreating the leach solution with iron powder, less than 5.5% of the Fe was extracted. The loaded phases were stripped using deionized water and ammonia solution. The maximum stripping rate of tungsten from loaded 2-octanol was 45.6% when using water, compared with only 13.1% from loaded TBP. Tungsten was efficiently stripped from loaded phases using ammonia solution without formation of Fe(OH) 3 precipitate. Finally, a flow sheet for recovery of tungsten with TBP is proposed.
研究领域:
冶金工程
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化学工程
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DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Lingbo Feng,Wei Zhang,Minglan Ge,Yufeng Yi,Jieming Xiong
Excellent extraction ability and easy regeneration of the extractant are highly important for the recovery of acetic acid from water by solvent extraction. In this paper, the extraction capability of octanol isomers and some conventional extractants was investigated. It was found that the extraction capability of 2-octanol was significantly better than that of the traditional extractant isopropyl acetate. The liquid–liquid equilibrium data for the ternary system of water + acetic acid + 2-octanol were measured at different temperatures (293.2, 303.2, and 313.2 K) under 101 kPa. The results showed that the distribution coefficient and selectivity decreased with an increase in acetic acid concentration and the temperature had little impact on the distribution coefficient, suggesting that the extraction could be conducted over a large temperature range. The reliability of the equilibrium data was also verified using the Othmer–Tobias and Hand equations, and the correlation coefficients were all close to 1.0, suggesting that the experimental data was reliable. Furthermore, the NRTL (nonrandom two-liquid) and UNIQUAC (universal quasichemical) models were employed to correlate the experimental data, and the binary interaction parameters of the ternary system were obtained. The results indicated that, for the UNIQUAC model, the root-mean-square deviations between the experimental and simulated data at different temperatures were from 0.63% to 0.94% and those for the NRTL model were all within 0.6%, which indicate that the NRTL model is more suitable for the ternary system of water + acetic acid + 2-octanol.
研究领域:
化学工程
·
分离科学
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DOI
高影响因子
HYDROMETALLURGY
·
2019
·
IF 3.465
Yongli Li,Zhongwei Zhao
For more than a hundred years, extraction with ethyl ether has been the most used method for synthetizing H 3 PW 12 O 40 . However, the use of ethyl ether as the extraction agent faced many problems, such as strict regulation by public safety and environment authorities, poor operating environment, significant dissolution loss, low yields (approximately 80%), and difficulty in realizing continuous production. To overcome these problems, a new extraction method has been proposed in this paper, which uses 2-octanol as the extraction agent and water as the stripping agent. Under optimal conditions (30% 2-octanol in kerosene, O:A = 1:1, 180 g/L H 2 SO 4 , 20 g/L H 3 PO 4 , 45 °C, and a contact time of 2 min), 90.2% of H 3 PW 12 O 40 contained in the solution was extracted in a single stage; the loaded H 3 PW 12 O 40 could then be stripped completely via 3-stage continuous countercurrent stripping by maintaining O:A = 5:1, 65 °C, and t = 5 min. Finally, the obtained strip liquor, containing more than 550 g/L H 3 PW 12 O 40 , was evaporated to obtain crystals, resulting in an increased recovery rate of 10%.
研究领域:
化学工程
·
材料科学
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DOI
高影响因子
MINERALS ENGINEERING
·
2020
·
IF 3.795
Xiaoxiao Qiao,An Liu,Zhihong Li,Jinchuan Fan,Canjin Luo,Panpan Fan,Yizhou Liu,Minqiang Fan
A novel combined reagent dodecylamine (DDA)–2-octanol–kerosene was employed to overcome the problems associated with DDA, that is, DDA has a high freezing point and needs to be acidified with hydrochloric or acetic acid when it is used for flotation. The analysis of the basic physical properties of the agent showed that DDA–2-octanol–kerosene had significant advantages in freezing point and dispersibility and its freezing point can be reduced to below 0 °C. From the flotation results of magnetite, it can be seen that DDA–2-octanol–kerosene has a better selectivity. Response Surface Methodology based on a three-level, three-variable Box–Behnken design (BBD) was employed to define the quadratic relationship between the recovery of quartz and the composition of the mixed agent. The results indicated that the recovery of quartz increased with the increase of DDA or 2-octanol dosage, however, kerosene had a marginal positive effect on the recovery of quartz when the amount of kerosene was less than 0.76 times that of DDA and otherwise a negative effect. This study provides a new method and technical support for its industrial application for the reverse flotation of iron ore for the combination of agents in the field of iron ore flotation. And allows for a deeper macro-level understanding of the interaction between the DDA–2-octanol–kerosene ternary mixed agents.
研究领域:
矿物加工工程
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化学工程
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材料科学
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DOI
高影响因子
HYDROMETALLURGY
·
2020
·
IF 3.338
Xintao Yi,Guangsheng Huo,Wei Tang
The extraction of Fe(III), Ni(II) and Co(II) from a Ni(II)-Co(II) solution containing Fe(III) was analyzed in a chloride medium using a mixed extractant consisting of 50% ( v /v) tributyl phosphate (TBP), 20% (v/v) 2-octanol and 30% (v/v) kerosene. The extraction of 0.5 mol/L Fe(III) in 4 mol/L hydrochloric acid reached 97%, and the consumption of chloride ions was investigated. Nickel(II) ions were not detectably extracted by TBP, with an inclusion of <1.1%. Compared with Fe(III), TBP extracted only a small amount of Co(II). The iron complexes formed by TBP and 2-octanol were [H 2 FeCl 4 · 2TBP] and [H 2 FeCl 4 · 5(2-octanol)], and the possible compositions of Co-containing extracts were [H 2 CoCl 4 · 2TBP] and [H 2 CoCl 4 ] · n[2-octanol]. An industrial process consisting of two-step extraction was designed to achieve the separation of Co(II) and Fe(III), resulting in a decrease in the Fe/Co mass ratio from 0.46 to <3.5 × 10 −4 in the raffinate.
研究领域:
化学工程
·
冶金学
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DOI
高影响因子
ACS Omega
·
2023
·
IF 4.1
Hong Zhang,Xin Zhang,Lei Wang,Bo Wang,Xu Zeng,Bo Ren,Xiaodong Yang
A novel lignin-enhanced graphene aerogel (LGA) was prepared by one-step hydrothermal synthesis, and lipase from Pseudomonas sp. (PSL) was immobilized on LGA successfully by interfacial activation. The catalytic activity and enantioselectivity of LGA-PSL for the preparation of (S)-2-octanol by an enantioselective transesterification were improved obviously. The characterization of LGA and LGA-PSL was performed. X-ray diffraction and Fourier transform infrared spectroscopy demonstrated the formation of numerous electrostatic and hydrogen bonds between lignin and graphene in the aerogel structure. In addition, the specific surface area pore size analyzer (BET) test proved that the introduction of lignin significantly increased the specific surface area and pore size of the aerogel material, which improved the immobilization efficiency of lipase in the aerogel. The introduction of lignin has changed the original lamellar structure of the graphene oxide (GO) aerogels. The lignin cross-linked with the GO lamellae through hydrogen bonding, causing a porous structure to form between the original lamellae, thus increasing their specific surface area. The immobilized lipase (LGA-PSL) was used for the preparation of (S)-2-octanol by an enantioselective transesterification, and the reaction conditions for this enzymatic transesterification had been optimized. LGA-PSL exhibited a high catalytic performance and could be reused four times in this reaction. Based on these results, LGA as an immobilization carrier had potential applications in the industrial application of lipase.
研究领域:
材料科学
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生物催化
·
酶工程
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产品关联
DOI
PubMed
高影响因子
Desalination and Water Treatment
·
2025
·
IF 1
Licheng Zhang,Yongming Zhang,Feiyu Kong,Xiaowu Peng,Lijuan Li
This paper presents a novel system and method for the extraction and separation of boron from alkaline solutions. The extraction system consists of a 1:1 molar ratio of 2-octanol and salicylate ester, which effectively extracts boron from the solution. The extraction efficiency of boron increases with the pH of the solution, reaching up to 75% in a single extraction stage when pH > 9. The study also investigates the effects of extraction ratio, extraction time, and extraction temperature on the extraction performance. Under optimized conditions, using natural salt lake brine from Tibet as the raw material, a three-stage countercurrent extraction process can achieve a boron extraction rate of 95%. After subsequent stripping and concentration, boric acid can be directly produced with a purity exceeding 99%. Moreover, the extraction system demonstrates good stability during the extraction-stripping cycle. FT-IR and Raman spectrum were employed to investigate the main functional group of the extraction process, and DFT was used to study the coordination mechanism. This work provides an effective pathway for the comprehensive utilization of boron in alkaline solutions.
研究领域:
化学工程
·
湿法冶金
·
分离科学
·
环境化学
·
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）