scholarly journals The effect of anionic impurities on the sorption extraction of molybdenum from leaching solutions

2020 ◽  
pp. 4-9
Author(s):  
Yelena Panova ◽  
Yenlik Abzhan ◽  
Aisulu Zhussupova
Keyword(s):  
Anion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Uranium Content ◽  
Leach Solution ◽  
Autoclave Leaching ◽  
Carbonate Solutions ◽  
Sorption Method ◽  
Industrial Solutions ◽  
Static Conditions

Molybdenum is one of the most important uranium-related metals. In the ores of many deposits, the molybdenum content is comparable to the uranium content. The processing of complex uranium-molybdenum ores is based on the methods of acid and soda autoclave leaching, in which uranium and molybdenum pass into solution. At the present time, the associated extraction of molybdenum by the sorption method has been developed and introduced. In this case, the capacity of ion exchangers with respect to uranium and molybdenum substantially depends on the salt composition of the medium. The aim of this work is to study the sorption of molybdenum from a carbonate leach solution on BD-301G-I anion exchange resin in the presence of the most common anionic impurities in industrial solutions. Studies of the sorption capacity of anion exchange resin with respect to molybdenum were carried out under static conditions with stirring of the solution with the sorbent during eight hours. Sorption of molybdenum was carried out from carbonate solutions with the corresponding given concentrations of impurity components. According to the results of studies, it was found that, according to the strength of the depressing effect, the considered anions arranged in the following row: S2O32- > NO3- > Cl- > SO42- > HCO3- > CO32- > PO43-. The results of this study can be used to further study the sorption of molybdenum from real industrial solutions of carbonate leaching.

scholarly journals STUDY OF THE CATALYTIC HYDRAZINOLYSIS OF HIGHER FATTY ACIDS

2020 ◽  
Vol 2 (440) ◽  
pp. 56-61
Author(s):  
S.A. Dzhumadullaeva ◽  
A.B. Bayeshov ◽  
A.V. Kolesnikov
Keyword(s):  
Palmitic Acid ◽  
Hydrazine Hydrate ◽  
Anion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Acid Hydrazide ◽  
Initial Mixture ◽  
Butyl Alcohol ◽  
Active Centers ◽  
Static Conditions

In this work, the reaction of hydrazinolysis of higher fatty acid in the presence of an ionite catalyst is considered for the first time. Synthetic commodity anion exchange resin AB-17-8 was used as a catalyst. Before use, the anionite was converted to OH-form and its exchange capacity was determined. The experiments were made in the static conditions in a glass reactor with mixing of the reaction mixture.The reaction of palmitic acid with hydrazine yielded the corresponding hydrazide. The influence of various factors (quantity of hydrazine hydrate, catalyst, butyl alcohol, temperature, reaction duration) on the formation of palmitic acid hydrazide was studied. It is shown that with an increase in the amount of hydrazine hydrate in the initial mixture from 2.0 to 2.52 g per gram of palmitic acid, the yield of hydrazide increases, and further increase in the concentration of this reagent leads to a decrease in the selectivity of the process, due to the occurrence of side condensation reactions. Increasing the amount of catalyst from 2 to 3 g per gram of palmitic acid leads to an increase in the yield of hydrazide. It reveals optimum conditions of synthesis under which the most palmitic hydrazide yield made 90%. The analysis of the initial substances and the reaction product was carried out using the photocolorimetric method. As a result, the IR spectroscopic researches of the mechanism of hydrazinolysis reaction of the palmitic acid with active centers of anion-exchange. It is shown that the reaction proceeds with the formation of transition complexes on the surface of the anion exchange resin. The practical value of this work is to develop an effective method of palmitic acid hydrazide preparation. Keywords: palmitic acid, hydrazine, hydrazide, catalyst.

PEMODELAN MATEMATIS ADSORPSI CO2 DENGAN STRONG BASE ANION EXCHANGE RESIN SEBAGAI ADSORBEN UNTUK PURIFIKASI BIOGAS

2015 ◽  
Vol 5 (1) ◽  
pp. 11
Author(s):  
Anies Mutiari ◽  
Wiratni Wiratni ◽  
Aswati Mindaryani
Keyword(s):  
Anion Exchange ◽  
Pilot Plant ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Scale Up ◽  
Sum Of Squares ◽  
Strong Base ◽  
Model Transfer ◽  
Plant Parameter

Pemurnian biogas telah banyak dilakukan untuk menghilangkan kadar CO2  dan meningkatkan kandungan CH4  yang terkandung di dalamnya. Kandungan CH4 yang tinggi akan memberikan unjuk kerja yang lebih baik. Model  matematis proses adsorpsi CO2 disusun berdasarkan teori lapisan film antar fasa, dimana pada proses yang ditinjau terdapat tiga fase yaitu gas, cair dan padat. Model matematis dari data eksperimental   kecepatan dan kesetimbangan proses adsorpsi CO2 melalui mekanisme pertukaran ion di suatu kolom adsorpsi telah dibuat. Model ini dibuat untuk mencari konstanta yang dapat dipergunakan pada proses scale up data laboratorium ke skala pilot plant. Parameter proses kecepatan yang dicari nilainya adalah koefisien transfer massa massa volumetris CO2 pada fase cair (kLa), koefisien transfer massa volumetris CO2 pada fasegas (kGa) dan tetapan laju reaksi (k1 dan k2). Pada hasil penelitian ini ditunjukkan bahwa nilai parameter yang diperoleh sesuai hasil fitting data dengan model matematis yang digunakan, yaitu model transfer massa pada lapisan film antar fase secara seri: adalah kGa, kla, k1 dan k2  dengan nilai Sum of Squares Error (SSE) rata-rata 0,0431. Perbandingan nilai kGa hasil simulasi dan teoritisnya memberikan kesalahan rata-rata 18,79%. Perbandingan nilai kLa hasil simulasi dan teoritis memberikan kesalahan rata-rata 7,92%.Kata kunci: model matematis, adsorpsi CO2, pemurnian biogas

Catalysis of the Photodecomposition of Chloroform by a Polystyrene Anion Exchange Resin

2013 ◽  
Vol 2 (2) ◽  
pp. 79-87 ◽  
Author(s):  
Laura A. Pena ◽  
Alissa M. Chan ◽  
Larissa R. Cohen ◽  
Karen Hou ◽  
Brent M. Harvey ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin
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