KU-2 cation exchange resin

The cation exchange experiments were performed with KU-2 cation exchange resin (equilibration time 7 days) in HNOs-NaNOs solutions, the colorimetric studies with Arsenazo III in both HNOs-NaNOs and HC104-NaC104 media and with Thoron I in HNOs-NaNOs solutions. The pH values were adjusted by dilution of the stock solutions with 0.1 M HNO3 or 0.1 M HCIO4 and addition of NH3 solution and measured with a glass electrode. Details on the electrode calibration are not reported. 

SYHTHESIS OF SORBATE ESTERS OF LOWER ALIPHATIC ALCOHOLS WITH THE USE OF KU-2 CATION EXCHANGE RESIN AS CATALYST. 

Figure 10.13 Fraction of zirconium removed onto a KU-2 cation exchange resin as a function of acid concentration and that predicted using Eg. (10.1) (solid line).

Furfural-salicylic acid and furfural-P-naphthalenesulfonic acid resins possess thermal stabilityexceeding that of KU-1 (sulfonated phenol-formaldehyde resin) and approaching that of KU-2 (sulfonated SDVB copolymer). The heat resistance of toluenesulfonic acid-furfural resin is quite similar to that of KU-2 resin. The improved thermal stability of furfural-based cation-exchange resins is attributed to the presence of heterocyclic and aromatic rings in these resins. 

Ethers. The polycondensation of diphenyl ether and furfural (1 1.5mole ratio) in presence of sulfuric acid yields a resin which has been sulfonated by sulfuric acid at 50 °C for 10 h to give a cation-exchange resin The swelling and the exchange capacity of the product increase with the amount of sulfuric acid present during the polycondensation and are higher for a resin obtained by polycondensation in carbon tetrachloride than the one prepared in absence of solvent. The thermal stability of sulfonated diphenyl ether-furfural resin is more than that of KU-1 and comparable to that of KU-2. The sulfonic acid resin derived from the copolymer obtained by the polymerization of diphenyl ether and furfural at a mole ratio of 1 2 in carbon tetrachloride has optimum adsorption and catalytic activity... 

Phenols are alkylated mainly in the / 0ra-position 659 for example p-tert-butylphenol is formed in 95% yield from phenol and isobutyl alcohol in this case a cation-exchange resin KU-2 was used, with 4 hours heating at 130°.660... 

By contrast, with a cation exchange resin (KU-2), 2-alkylphenols reacted in p-... 

The solution is pumped through a column containing a strong cation exchange resin in NH/ form (for example, KU-2-8). Amoimt of the solution treated in one cycle, V/Vq, is 10-12 volumes per volume of the sorbent bed. The column traps lysine and major part of melanoidins. Due to a frontal chromatography process, a major part of alanine can be... 

S - cation exchange resin Ku 2-8 C - chitosan A - glutaric dialdehyde El - horseradish peroxidise, E2 - mushroom tyrosinase... 

The elution peak positions of a number of Ions including uranium (IV) and (Vl) are given In figure 75 for various hydrochloric add concentrations. The conditions under which the peodc positions were determined are described in the figure caption. lonescu, et al. have studied the effect of acetone on the distribution of several elements between cation exchange resins, KU-2 and H-21, and dilute hydrochloric acid solutions. 

Figure 24 A scheme for KNO3 production (sulfonate cation exchanger KU-2 X 8 3.0-4.0 mol/dm solutions) (1) column for KNO3 synthesis (2) resin regeneration column (3,4) systems for electrolyte displacement (5-8) tanks.

It is well known that corrosion processes are enhanced if there are high levels of impurities in the water. Therefore, to keep the level of impurities low, an ion exchange purification system has been employed since startup in the MIR reactor coohng pool. This system includes a heat exchanger, a pump, two filters with a total capacity of 800 L, a flowmeter, shut-off valves and other fittings. The filters are filled with Russian made nuclear grade ion exchange resins KU-2-8 (cationic) and AV-17-8 (anionic) in the ratio of 2 1. This system provides reduction of the specific p activity by more than a factor of 10. When this index drops to a factor of 2, the resin is replaced otherwise, as a rule, it is replaced once a year. 

The heterogeneous cation-exchange membrane MK-40 was made by addition of polyethylene to the cation-exchange KU-2 resin. 

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