scholarly journals Cation-exchange resins as heterogeneous catalysts for the synthesis of 1,3-butadiene from propylene and formaldehyde

2021 ◽  
Vol 8 (2) ◽  
pp. 20218201
Author(s):  
T. M. Kutuzova ◽  
O. M. Kuznetzova ◽  
R. A. Akhmedyanova
Keyword(s):  
Cation Exchange ◽  
Heterogeneous Catalysts ◽  
Isopropyl Alcohol ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Cyclic Trimer ◽  
Cation Exchange Resins ◽  
Technological Stage ◽  
Exchange Resins ◽  
By Products

The possibility of using the cation-exchange resin Lewatit K2420 as a catalyst for the synthesis of 1,3-butadiene from isopropyl alcohol and formaldehyde solution in one technological stage has been shown. The regularities of the process have been established and the influence of the formaldehyde form (a cyclic trimer 1,3,5-trioxane and a 37% solution in water) on the composition of the reaction mass and the yield of the main and by-products has been assessed. It has been shown that the Lewatit K2420 heterogeneous catalyst showed catalytic activity in all reactions occurring in the synthesis of 1,3-butadiene, including the decomposition of 1,3,5-trioxane, dehydration of isopropyl alcohol into propylene,  condensation of propylene and formaldehyde, dehydration of 3-butene-1-ol, decomposition of 4-methyl-1,3-dioxane, etc.

Kinetics of LIS-100 Cation Exchange Resin to Remove Reaction Substrate of Non-Enzymatic Browning in Clarified Apple Juice

2013 ◽  
Vol 699 ◽  
pp. 770-774
Author(s):  
Jian Hua Yi ◽  
Mei Li Li ◽  
Zhen Bao Zhu
Keyword(s):  
Amino Acids ◽  
Cation Exchange ◽  
Apple Juice ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Enzymatic Browning ◽  
Adsorption Parameters ◽  
Cation Exchange Resins ◽  
Exchange Resins ◽  
Dynamic Exchange

In order to inhibit non-enzymatic browning in clarified Fuji apple juice during storage, four kinds of cation exchange resins were compared for their abilities to exchange and remove amino acids, the reaction substrates of non-enzymatic browning in apple juice. The favorite resin, LSI-100, was screened to carry out static and dynamic adsorption experiments. The results showed that LSI-100 cation exchange resin had the best capacity for adsorption and removal amino acids. The equilibrium time of LSI-100 resin for amino acids was 3.5h.And the isotherm of LSI-100 resin could be described by Freundlich at 20°C. Additionally, the flow rates, temperature and concentrations of amino acids in apple juice affected the dynamic kinetic curves of LSI-100 cation exchange resin and the better dynamic exchange and adsorption parameters were as follows: flow rate 4BV/h, temperature 50°C,and amino acid concentration 30mg/100g apple juice.

Cation Exchange Resin Supported Oxidation of Alkylbenzenes and Olefins using Potassium Permanganate†

2000 ◽  
Vol 2000 (1) ◽  
pp. 38-39 ◽  
Author(s):  
Padmaker L. Joshi ◽  
Braja G. Hazra
Keyword(s):  
Cation Exchange ◽  
Potassium Permanganate ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Oxidative Cleavage ◽  
Side Chains ◽  
Cation Exchange Resins ◽  
Exchange Resins

Rapid and efficient oxidation of alkylbenzene side chains at the benzylic positions as well as oxidative cleavage of olefins with potassium permanganate in presence of solid polymeric cation exchange resins in good yields is reported.

scholarly journals Silver-containing Cation Exchange Resin: Synthesis and Application

2021 ◽  
Author(s):  
Renat KHAYDAROV ◽  
Murodjon ABDUKHAKIMOV ◽  
Ilnur GARIPOV ◽  
Ilkham SADIKOV ◽  
Praveen Thaggikuppe KRISHNAMURTHY ◽  
...  
Keyword(s):  
Cation Exchange ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Spherical Shape ◽  
Climatic Conditions ◽  
Water Softening ◽  
Biofilm Growth ◽  
Cation Resin ◽  
Resin Beads ◽  
Exchange Resins

Cation exchange resins are widely used for water softening and demineralization all over the world. Deposition, metabolism, and growth of bacteria and fungi on the resin beads cause capacity and performance losses, especially during repeated use in cyclic and long-term operations. Over the last decades, modification of different materials by silver nanoparticles (AgNPs) has demonstrated to present significant opportunities in mitigating biofouling problems. The paper deals with a novel facile technique of introducing silver colloids (AgC) into cation exchange resin, providing the formation of silver micro- and nano-inclusions on the cation resin beads. The scanning electron microscope (SEM) measurements have confirmed a spherical shape and uniform distribution of AgC (50 – 1000 nm) on the surface of the resin. To evaluate the antibacterial and fungicidal properties of AgC on the cation resin beads, we have used Aureobasidium sp., Penicillium sp., and Staphylococcus aureus cultures. AgC coating has proved to efficiently prevent bacteria/biofilm growth on the cation resin beads and thereby significantly increase the service life of the cation exchange resin, especially in hot climatic conditions. Possible antibiofouling mechanisms of the modified nanocomposite cationite have been discussed. Since 2020, the modified silver-containing cationite has been successfully utilized for water softening systems of boiler equipment in Uzbekistan, demonstrating the suitability of the suggested facile coating technique for reducing fouling of cation-exchange resin.

Rapid Separation of the Components of Nucleic Acids and Urine by High-Resolution Liquid Chromatography

1970 ◽  
Vol 16 (8) ◽  
pp. 667-676 ◽  
Author(s):  
A C Burtis ◽  
M N Munk ◽  
F R MacDonald
Keyword(s):  
Liquid Chromatography ◽  
Nucleic Acid ◽  
Ion Exchange ◽  
Cation Exchange ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Dead Volume ◽  
Rapid Separation ◽  
Exchange Resins ◽  
System Operating

Abstract The improved separations of nucleic acid components obtained with two recently developed liquid chromatography systems are presented. An ion-exchange system operating at 3000 lb/in.2, developed for use with pellicular ion-exchange resins, separates the 2',3'-ribonucleotides of the four common bases in 55 min, the 5'-deoxynucleotides in 10 min, a mixture of four dinucleotides in 30 min, and a mixture of AMP, ADP, and ATP in 3.5 min. The difficult separation of the mono-, di-, and triphosphates of the four nucleosides requires 2.5 h with the pellicular anion-exchange resin. The four bases, or their nucleosides, are separated in less than 15 min with pellicular cation-exchange resin. The system has been modified to allow separation of more than 90 uv-absorbing constituents in human urine. A versatile, nonpulsating system, operated at 5000 lb/in.2, separates the ribonucleosides in less than 5 min on small-particle, conventional cation-exchange resin. Resins from three separate sources performed comparably, but parameters such as pH, temperature, and linear velocity must be optimized for each. Both systems are designed with a minimum of dead volume and use a sensitive uv photometer. The 0.02 absorbance unit full-scale sensitivity and 1-cm pathlength of the uv photometer allow analysis of picomole quantities of nucleic acid components.

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