Efficient recovery of high-purity aniline from aqueous solutions using pervaporation-fractional condensation system

AIChE Journal ◽  
2015 ◽  
Vol 61 (12) ◽  
pp. 4445-4455 ◽  
Author(s):  
Chuncheng Li ◽  
Xinru Zhang ◽  
Xiaogang Hao ◽  
Minmin Wang ◽  
Chuan Ding ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
High Purity ◽  
Fractional Condensation ◽  
Efficient Recovery

Method for Efficient Recovery of High-Purity Polycarbonates from Electronic Waste

2015 ◽  
Vol 49 (4) ◽  
pp. 2425-2433 ◽  
Author(s):  
George S. Weeden ◽  
Nicholas H. Soepriatna ◽  
Nien-Hwa Linda Wang
Keyword(s):  
High Purity ◽  
Electronic Waste ◽  
Efficient Recovery

Mutual Separation of Uranium, Plutonium and Fission Products by Gradient Multistage Extraction

1962 ◽  
Vol 1 (1) ◽  
Author(s):  
Tomitaro Ishimori ◽  
Johkun Akatsu
Keyword(s):  
Nitric Acid ◽  
Aqueous Solutions ◽  
High Purity ◽  
Active Material ◽  
Fission Products ◽  
Mutual Separation ◽  
Uranium Plutonium ◽  
Organic Solutions

SummaryUranium, plutonium and fission products are separated by means of a simple multistage extraction of 20% TBP-carbontetrachloride vs. nitric acid series. In order to enhance the mutual separation, the acidity of the aqueous portions is lowered stepwise. All fission products, plutonium and uranium are obtained in aqueous solutions in the sequence mentioned, leaving no active material in the organic solutions of the extractor. The plutonium fractions contain some fission products and a small amount of uranium. However, uranium is obtained with a fairly high purity. The same organic solutions can be used several times giving more or less the same separated products.

scholarly journals Efficient Recovery of Noble Metal Ions (Pd2+, Ag+, Pt2+, and Au3+) from Aqueous Solutions Using N,N'-Bis(salicylidene)ethylenediamine (Salen) as an Extractant (Classic Solvent Extraction) and Carrier (Polymer Membranes)

Membranes ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 863
Author(s):  
Katarzyna Witt ◽  
Małgorzata A. Kaczorowska ◽  
Daria Bożejewicz ◽  
Włodzimierz Urbaniak
Keyword(s):  
Aqueous Solutions ◽  
Metal Ions ◽  
Noble Metal ◽  
High Resolution Mass Spectrometry ◽  
Polymer Membranes ◽  
Single Component ◽  
Molar Ratio ◽  
Efficient Recovery ◽  
The Stability ◽  
Precious Metal Ions

This paper presents the results of the first application of N,N'-bis(salicylidene)ethylenediamine (salen) as an extractant in classical liquid–liquid extraction and as a carrier in membrane processes designed for the recovery of noble metal ions (Pd2+, Ag+, Pt2+, and Au3+) from aqueous solutions. In the case of the utilization of membranes, both sorption and desorption were investigated. Salen has not been used so far in the sorption processes of precious metal ions. Recovery experiments were performed on single-component solutions (containing only one type of metal ions) and polymetallic solutions (containing ions of all four metals). The stability constants of the obtained complexes were determined spectrophotometrically. In contrast, electrospray ionization high-resolution mass spectrometry (ESI-HRMS) was applied to examine the elemental composition and charge of the generated complexes of chosen noble metal ions and salen molecules. The results show the great potential of N,N'-bis(salicylidene)ethylenediamine as both an extractant and a carrier. In the case of single-component solutions, the extraction percentage was over 99% for all noble metal ions (molar ratio M:L of 1:1), and in the case of a polymetallic solution, it was the lowest, but over 94% for platinum ions and the highest value (over 99%) for gold ions. The percentages of sorption (%Rs) of metal ions from single-component solutions using polymer membranes containing N,N'-bis(salicylidene)ethylenediamine as a carrier were highest after 24 h of the process (93.23% for silver(I) ions, 74.99% for gold(III) ions, 69.11% and 66.13% for palladium(II) and platinum(II) ions, respectively), similar to the values obtained for the membrane process conducted in multi-metal solutions (92.96%, 84.26%, 80.94%, and 48.36% for Pd(II), Au(III), Ag(I), and Pt(II) ions, respectively). The percentage of desorption (%Rdes) was very high for single-component solutions (the highest, i.e., 99%, for palladium solution and the lowest, i.e., 88%, for silver solution), while for polymetallic solutions, these values were slightly lower (for Pt(II), it was the lowest at 63.25%).

Water-soluble manganese phthalocyanines

2013 ◽  
Vol 17 (08n09) ◽  
pp. 881-888 ◽  
Author(s):  
Olga Dolotova ◽  
Olga Yuzhakova ◽  
Ludmila Solovyova ◽  
Ekaterina Shevchenko ◽  
Vladimir Negrimovsky ◽  
...  
Keyword(s):  
Coordination Chemistry ◽  
Aqueous Solutions ◽  
Elemental Analysis ◽  
High Purity ◽  
Water Soluble ◽  
Metal Free ◽  
Organic Bases ◽  
New Findings ◽  
Vis Spectroscopy ◽  
New Compounds

Three new substituted manganese phthalocyanines (PcMns), wich are water-soluble, have been synthesized with good yields (70–80%) and high purity. Pyridiniummethyl- and cholinylsubstituted phthalocyanines have been obtained from the chloromethylsubstituted PcMns , while octacarboxysubstituted complex has been synthesized from metal-free octacarboxyphthalocyanine tetraanhydride. Compounds were characterized by elemental analysis and mass, IR and UV-vis spectroscopy. In general, coordination chemistry of the compounds studied is similar to this one of liposoluble PcMns but some new findings have been obtained. Three coordination forms — PcMn ( II ), PcMn ( III ) X ( X = Cl -, OAc -, …) and [ LPcMn ( III )]2 O ( L = Py , Et 3 N , …) have been obtained for all the new compounds. The equilibrium between three electronic isomers — Pc+• Mn ( I ) × L , PcMn ( II ) × nL , (n = 1, 2) and Pc-• Mn ( III ) × 2 L has been observed in PcMn aqueous solutions upon the addition of organic bases L ( Py , Et 3 N , …).

Sign in / Sign up

Export Citation Format

Share Document