Results are presented from gravimetric anti-corrosion studies of pyridine salts 1-(4-isohexylphenoxy-)-3-propylpyridinium bromide (I) and 1-(4-isohexylphenoxy-2-diethylaminostil-)-3-pyridinium bromide (II) on St. 3 steel in 0.5 N Н2SO4. The effect the temperature (298, 303, 313, 323, 333 K) and concentrations of compounds (0.025, 0.05, and 0.1 g/L) have on the rate of corrosion and protective effect is studied (duration of test, 3 h). It is established that compounds I and (especially) II are strong inhibitors: the degree of protection against corrosion for St.3 steel at concentrations of 0.1 g/L is 96

Triple co-oligomers of 4-isopropenylphenol, phenol and formaldehyde were synthesized and used for the first time as precursors in the structuring reaction in the presence of acrylonitrile and the initiator benzoyl peroxide. The yield of cross-linked copolymers is 84% (of theory). The use of hydrolyzed cross-linked copolymers is shown to be effective as sorbents for the extraction of UO 2 2+ ions from model aqueous systems under batch conditions, and the degree of their sorption significantly depends on the medium pH, the initial concentration of UO 2 2+ ions and the exposure time. The best results were achieved at pH 7 and 9, at which the degree of extraction of UO 2 2+ ions from an aqueous solution with their initial concentration of 134 ± 0.5 mg L –1 is ~93.5% (room temperature, 24 h), while the sorption capacity of the cross-linked copolymer is ~210 mg g –1 . The highest sorption capacity of the copolymer reaches 300 ± 30 mg g –1 . The possibility of regeneration of the sorbent with mineral acid (НNO 3 , HCl) was revealed; the maximum degree of desorption of UO 2 2+ ions is ~91%.

The paper presents the results of anticorrosion gravimetric studies of the quaternary nitrogen-containing derivatives of 2-allyl-4-isodecylphenol, namely, the quaternary ammonium salts 2-allyl-4-isodecyl-6-diethylaminomethylphenol (I) and 2-allyl-4-isodecyl-6-piperidinomethylphenol (II) on steel St.3 plates in a system consisting of a 3

The extraction of uranium salts from aqueous systems was studied under steady-state conditions (at 25°C with the use of a sorbent material based on the 4-isopropenylphenol–phenol–maleic anhydride cooligomer). The effect of different factors (pH of the medium, concentration of uranyl ions (at 25°С), copolymer amount, and exposure time) on the principal sorption process parameters (degree of extraction of uranyl ions and sorption capacity) was revealed. At pH 5–6, the degree of extraction of uranyl ions was established to attain a maximum (~94%) at a sorption capacity of ~80 mg/g. At the optimal values of pH (5–6), the dependence of the steady-state sorption capacity on the initial concentration С0 of uranyl ions was investigated. The steady-state region was observed at a concentration of >200 mg/L and, in this case, the sorption capacity was 101 mg/g. The Freundlich and Langmuir isotherms were plotted, and some hypotheses about possible interactions between uranyl ions and active copolymer moieties were made. The possibility of regenerating the sorbent in the presence of acids and alkalies was also investigated. Maximum desorption of ~96.2% was revealed in the presence of mineral acids.

В статье приводятся результаты исследований по синтезу четвертичных солей пиридина и хинолина взаимодействием последних с различными бром- и дибромалканами и изучению их защитныхпротивокоррозионных свойств по отношению к стали Ст.3 в водно-солевых-углеводородных и сероводородсодержащих системах. Установлено, что наилучшими защитными свойствами обладает соединения симметричной структуры. Степень защиты от коррозии при их концентрации 100 мг/л в водно-солевой-углеводородной среде составляет соответственно 87 и 93%, а в присутствии Н2S-73 и 84%.

The results of gravimetric and potentiostatic studies of pyridinium salts, derived from alkenylphenols, as inhibitors of hydrogen sulfide corrosion of steel St 3 in aqueous saline and hydrocarbon systems and testing the salts for bactericidal activity against sulfate-reducing bacteria (SRB) are reported. It has been found that the test compounds with a concentration of 50–150 mg/L slow down the cathodic and anodic reactions and significantly increase the polarization resistance ( R p ) of St 3. The best protective properties have been shown by 1-(2-propenylphenoxytetramethylene)- N -pyridinium bromide (III) and 1-(2-allylphenoxytetramethylene)- N -pyridinium bromide (VI): the corrosion protection by III and VI is respectively 87 and 83% at a concentration of 50 mg/L or 96 and 93% at a concentration of 150 mg/L. The pyridinium salts synthesized in this study also exhibit bactericidal activity in a concentration of 50–200 mg/L. High bactericidal properties have been found for 1-(2-propenylphenoxytetramethylene)- N -pyridinium bromide. The SRB growth inhibition at its concentration of 50 or 75 mg/L is 75 or 100%, respectively.

Modification with diethylamine and diethanolamine of co-oligomers of 2-propenylphenol with maleic anhydride yielded water-soluble nitrogen-containing derivatives inhibiting the corrosion of St.3 steel in watersalt solutions.

By the reactions of double cooligomers of 2-propenylphenol and maleic anhydride (M similar to 4500) with various amines their water-soluble nitrogen-containing derivatives have been synthesized. The surface-active properties of latter ones at the border of aqueous solution-air have been investigated and some parameters of micelle formation have been determined

Pyridinium salts have been synthesized by reacting 2-allyl- and 4-propenylphenoxy(C2–C4)bromoalkanes with pyridine and further examined as inhibitors of hydrogen sulfide corrosion of St3 steel in water-salt systems containing H2S. The dependence of the protective properties of the test compounds on their structure has been revealed. It has been found that N-(2-propenylphenoxytetamethylene)pyridinium bromide exhibits the best inhibitory properties (degree of corrosion protection at a concentration of 100 mg L−1 is 96.0%).

Aminomethylated derivatives 2-propenyl-, 2-allyl-, and 4-isopropenylphenols are studied as comonomers in free-radical copolymerization with styrene in bulk. As evidenced by NMR studies, in o-aminomethyl derivatives of alkenylphenols, stable intramolecular hydrogen bonds form between nitrogen atom of the aminomethyl fragment and hydrogen atom of the hydroxyl group; these bonds are not destroyed up to 80°C Therefore, these compounds may be involved in free-radical copolymerization with styrene in which the inhibiting effect of OH groups is avoided at a temperature of 60°C. The values of r 1 and r 2 are determined for two pairs of comonomers: 6-morpholinomethyl-2-propenylphenol and styrene (r 1 = 0.20 ± 0.01 and r 2 = 2.40 ± 0.04) and 2-allyl-6-morpholinomethylphenol and styrene (r 1 = 0.090 ± 0.009 and r 2 = 2.40 ± 0.04).

Maleic anhydride-styrene-1,4-di(4-isopropenylphenoxy)butane terpolymer was tested as sorbent for treatment of aqueous solutions, including oil-field brines, to remove uranium salts.