Chemical Engineering and Processing-Process Intensification
·
2024
·
IF 3.8
Liran Hu,Shan Li,Tao Luo,Dehua Xu,Xiushan Yang,Xinlong Wang
The escalating production of titania via the sulfuric acid method has led to increase in the titania waste acid (TWA) production. 6 to 8 tons of waste acid, containing 20 to 25 wt% sulfuric acid, are generated for 1 ton of titania. In China, nearly 30 million tons of TWA were produced in 2021. Currently, various utilization methods are employed for TWA treatment, with limestone neutralization and concentration methods being the most used. These methods have drawbacks such as substantial waste production and high operational costs. This work proposes a new process for directly neutralizing TWA with iron oxides (hematite and magnetite) produced by chemical reduction of ferrous sulfate. The study investigated the rates and limitations of the reactions between TWA and iron oxides under various temperature and liquid-solid ratios. Furthermore, the morphology, chemical composition and reactivity of remaining solid left in the reaction mixture were analyzed, the kinetic and thermodynamic properties of the reactions between iron oxides and TWA were calculated. This work provides a systematical and comprehensive study of the reactions between hematite or magnetite and TWA from the perspectives of thermodynamics and kinetics, providing fundamental data and crucial parameters for the intensification of the TWA treatment processes.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Jingwen Luo,Mingshuo Cui,Xiaodong Lian,Bin Yuan,Chenhao Song,Yingchao Ma,Yapei Wang
The multicomponent structure and the large area of oil–water interfaces make multiple emulsions promising for use in cosmetic manufacturing, food industries, and agricultural production. However, the high energy input and extensive use of emulsifiers in the process of multiple emulsion preparation severely limit their application. In this work, we propose a simple but highly efficient emulsification strategy to realize one-step multiple emulsions. To this end, the interfacial acid–base neutralization reaction by oleic acid and ammonia is employed as the driving force to construct a spontaneous emulsifying system, thus realizing emulsion formation in a low-energy manner. Moreover, the products generated by the interfacial neutralization reaction can act as emulsifiers to stabilize both the O/W and W/O interfaces and construct multiple emulsions with an O/W/O structure. Compared to conventional methods of multiple emulsion formation, the one-step multiple emulsion method driven by an interfacial neutralization reaction can significantly reduce the energy consumption and the emulsifier dosage during the emulsifying process, thus avoiding the probable environmental problems caused by the residual emulsifiers. This study not only provides a new idea for the preparation of multiple emulsions but also effectively promotes the development of low-surfactant emulsification methods.
研究领域:
化学工程
·
材料科学
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食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Qi Zhang,Hongying Xia,Yingjie Xu,Guiyu Jiang,Wuchen Cai,Libo Zhang
Arsenic in zinc sulfate solution greatly hinders the zinc hydrometallurgy process, and the treatment of arsenic residue with lime also generates large cost due to the large amount of residue. Herein, a new process of neutralization by zinc roasting dust (ZRD) and ultrasound (US) field enhancement of arsenic removal was proposed. The process includes the following steps:one-stage neutralization, KMnO 4 oxidation and two-stage neutralization to remove arsenic. The process has the advantages of a good arsenic removal effect, no introduction of new impurities, and less residue. The effects of the ZRD dosage, temperature and US power on arsenic removal were investigated. The optimal conditions were 12 g/L, 70 ℃ and 300 W, respectively, and the arsenic removal rate reached 99.3%. The X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) and field emission scanning electron microscopy (FE-SEM-EDS) were utilized to analyze the raw materials and residue. The results showed that, compared with conventional conditions, US strengthening treatment led to more complete reaction of ZRD. The arsenic removal residue after US treatment mainly existed in the form of ZnFe 2 O 4 , Fe 3 O 4 and ZnS, which exhibited low reactivity. Ultrasound could effectively destroy the wrapper on the surface of ZRD, and enhance the liquid–solid reaction, which reduced the amount of residue and improved the arsenic removal efficiency. Interestingly, we found that ultrasound could enhance arsenic removal by increasing the ligand exchange between arsenate and sulfate. Compared with the lime and conventional ZRD neutralization, the wet residue weight after US treatment was reduced by 46.8% and 16.3%, respectively.
研究领域:
环境科学
·
冶金工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 35
·47898
·
IF 2.188
Mingfen Sun,Xiue Ren,Jianhui Zhang,Xiaoming Zhang,Hongyan Wang
A new technology integrating the synthesis and granulation was adopted to prepare the one-component polyurethane powder adhesives (PPAs) by the solution polymerization. The influence of R total , neutralization, and types of dispersion solution on the properties of PPAs was investigated. It was found that the initial melting temperature increased and storage stability decreased with increasing R total . The neutralization reaction between the carboxylic group and amino group made the reduction of the sizing temperature and the increase of the T-peel adhesion strength. The granulation behaviors of the polyurethane (PU) prepolymer under different dispersion solutions showed that the PU prepolymer can be effectively blocked by the 20–30 wt % NaHSO 3 or n-butyl alcohol. Furthermore, the blocked polymers formed small particles with the ideal sizing temperature and peel strength. The excellent adhesive property and thermal stability of PPAs could meet the requirements of the industrial gluing in the fields of packaging, lining, and footwear. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47898.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
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2022
·
IF 4.291
Cheng Bai,Wen Zhou,Shifeng Yu,Tengfei Zheng,Chaohui Wang
Microfluidic mixing is a critical issue in the lab-on-a-chip system, which has been applied in various biomedical research. Recently, acoustic wave-based active micromixers have been applied to increase the mixing efficiency via acoustic streaming. However, along with the acoustic streaming, the acoustic thermal effect will generate additional heat to increase the temperature of the microfluid. In this work, we present an integrated thermal control unit applied to a surface acoustic wave (SAW)-assisted micromixer to address this problem. A metal microwire as the thermal resistance sensor is fabricated under the microchannel to measure the temperature in different conditions, together with the Peltier cooler beneath allowing the active temperature control of the microfluid. For characterization, neutralization reaction and alkaline phosphatase assay were successfully conducted on this device. It shows the integrated thermal control unit applied to a SAW-assisted micromixer is highly effective in temperature-sensitive biomedical research.
研究领域:
微流控技术
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生物医学工程
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声学
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热能工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Bingzheng Jiang,Jiaxin Li,Dong Chen,Li Wang,Wantai Yang
The development and application of high-efficiency coal-water slurry (CWS) dispersants can foster the clean utilization of natural coal. CWS with excellent flowability and stability requires good adsorption capacity of dispersant on pulverized coal surface, which is influenced substantially by the architecture and hydrophilicity of dispersants molecule. In this study, a series of neutralized sulfonated poly(styrene- alt -maleic anhydride) (NSPSM) with different molecular weight (M n ) and sulfonation degree (SD) were synthesized by self-stabilized precipitation polymerization (2SP), gas-solid heterogeneous sulfonation reaction (GSR) and neutralization reaction with NaOH. The performance of NSPSM for CWS, and their dispersion and stabilization mechanisms were investigated in detail. Under optimized conditions, maximum slurry concentration (MSC) and water separation ratio (WSR) of slurry with NSPSM could reach 66.5% and 2.0%, respectively, which are superior to commercial naphthalene sulfonate formaldehyde condensate (NSF) dispersant. The outstanding dispersibility of NSPSM was ascribed to its improved adsorption capacity due to increased charge density along polymer chain, which can prevent agglomeration among coal particles through electrostatic repulsion.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 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）