Mai Han,Mingyi Xu,Yufan Pang,Jingwei Cao,Anle Zhang,Yuxin Wang,Jiajun Wei,Yujian Song,Qingsong Li
Ethyl acrylate (EA) has a wide range of uses, providing convenience for industrial production and daily life. The production process often produces water by-products, so this work selects four commonly used alcohols (1-pentanol, 1-hexanol, 1-heptanol, and 1-octanol) as extractants to explore the liquid–liquid equilibrium (LLE) of water + EA + extractants. Through the analysis of partition coefficient (D), and separation factor (S), it is found that the data of all systems are>1. At the same time, the RMSD% and AAD% calculated by the regression of thermodynamic models (NRTL and UNIQUAC) are both less than 1, indicating that all four alkyl alcohols can separate EA from aqueous solutions well, and 1-octanol has the best effect. Furthermore, the consistency of the LLE data is demonstrated using MATLAB tools.
Aiming at the problem that the active agent foam is too stable during the flotation process, the experiments of the surface tension, surface viscoelasticity and gas-liquid two-phase foam performance of sodium oleate were carried out under the conditions of different concentrations, pH and temperature. The aim is to explain the changes in macroscopic blistering phenomena by changes in microscopic surface properties. The results show that concentration, pH and temperature all affected the foam properties of sodium oleate. When the sodium oleate solution is 10 −3 mol/L (cmc), the foam stability is the best. The foam is most stable at pH of around 8.5. Temperature has a significant effect on the foaming property of sodium oleate, the foaming ability of sodium oleate is weak at a low temperature, while sodium oleate is unstable at high or low temperature. The lower the surface tension of the sodium oleate solution, the stronger the foaming performance; and the higher the expansion modulus, the more stable the foam. This study serves as a guide to control the parameters of sodium oleate flotation system and the optimal stabilisation of foam.
Currently, first removal of iron and then extraction of titanium from the ilmenite leachate using solvent extraction was a popular research topic for recovery of strategic materials titanium and iron. However, the reported studies showed poor extraction efficiency and selectivity for titanium and iron in the later stage due to the randomness of initial screening of extractants, which had resulted in a lengthy process for removing impurity metal ions and increased costs. This paper designed the functional extractants for high selectivity recovery of titanium and iron from ilmenite HCl leachate based on the extraction mechanism, respectively. The extraction mechanisms were first demonstrated in detail. Then, the designed extractant, amides and long-chain alkyl alcohols, showed desired advantages and high performance for extraction of iron (99.95%) and titanium (99.23%) through actual extraction of metal ions from ilmenite HCl leachate, respectively. Meanwhile, the separation coefficients of iron and titanium to other metal ions were much greater than 1. Subsequently, the distribution and transfer laws of impurity metal ions, V, Cr, Mn, Mg, Ca and Al, in aqueous and organic phases were specifically revealed during all processes, and majority of impurity metal ions coextracted were removed. Finally, 99.82 wt% of iron solution and 99.87 wt% of titanium solution were obtained, respectively. This study may contribute to the design of functional extractants and its application in efficient recovery of valuable metals.
危险品化学品经营许可证（带存储）